Christopher L. Amling, MD, FACS

• John Barry Professor and Chair Department of Urology
• Oregon Health & Science University Portland, Oregon

https://www.ohsu.edu/people/christopher-amling-md-facs

In regards to the early surgical debridement for patients with severe sterile necrosis and clinical deterioration antimicrobial yoga mats order genuine minomycin, it is imperative to consider available data on the timing of surgical intervention in regards to perioperative mortality bacteria biology minomycin 50 mg online. Speci cally infection x private server best 50 mg minomycin, as outlined in a study by Mier and others90 and con rmed in numerous other studies antibiotic resistance otolaryngology buy 100 mg minomycin free shipping, early surgical debridement herbal antibiotics for acne 100 mg minomycin purchase with visa, compared to delayed intervention, has much higher perioperative mortality. For the deteriorating, critically ill patient with organ failure taken emergently to the operating room for pancreatic debridement early in the course of illness, perioperative mortality is extremely high. A further consideration regarding debridement for sterile pancreatic necrosis concerns the time-dependent nature of pancreatic infection. Among patients managed nonoperatively for pancreatic necrosis, some experience persistent pain, malaise, and inability to eat. As is the case with sterile necrosis in the acute setting, the indications for and timing of surgery for this group of patients has not been precisely de ned. Several nonrandomized studies have demonstrated signi cantly better outcomes in patients undergoing late versus early debridement,83,90 and surgical debridement is considerably facilitated by the demarcation that occurs later in the course of pancreatic necrosis. All patients recovered well and were discharged at a mean of 27 (8­146) days after surgery. Such delayed procedures are an important part of a conservative management strategy that emphasizes nonoperative management for most cases of sterile necrosis and late operations if necessary. An algorithm for management strategies in acute pancreatitis summarizing the principles discussed above is outlined in. For those patients requiring operative intervention, percutaneous drainage is increasingly employed as an adjunct to or in lieu of open surgical management. Operations addressing etiology are generally limited to interventions to eliminate cholelithiasis and thus eliminate gallstone pancreatitis. For patients with known gallstone pancreatitis, cholecystectomy is recommended after the resolution of pancreatic in ammation. Surgical strategies for approaching the necrotic pancreas are addressed below, with particular attention to strategies for pancreatic debridement and postdebridement management, and the use of minimally invasive techniques. Resection Pancreatic resection for acute pancreatitis is primarily of historical interest only and is not currently recommended. Several authors in the 1960s and 1970s recommended partial or total pancreatectomy for pancreatitis based on the possibility that the remaining pancreas could be a source of persistent in ammation. Viable tissue typically exists adjacent to necrotic tissue, and intraoperative di erentiation between healthy pancreatic parenchyma and necrotic tissue can prove di cult. For instance, even with apparent total necrosis, the central pancreas surrounding the main pancreatic duct is often viable and is important for endocrine and exocrine function after resolution of the acute disease. Anatomic resection for pancreatitis, with or without associated pancreatic necrosis, is therefore thought to serve little utility and potentially may confer signi cant risk. Pancreatic Debridement All techniques of pancreatic debridement and postdebridement care are based on two principles: rst, wide removal of devitalized and necrotic tissue with thorough exploration and unroo ng of all collections of solid and liquid debris; second, the assurance of postoperative removal of the products of ongoing local in ammation and infection which persist after debridement. Various techniques of open pancreatic debridement for necrotizing pancreatitis have been advocated in the literature. Debridement with closure over drains, debridement with open packing, or debridement with closure over irrigation drains and postoperative lavage are the three methods commonly reported. Mortality and complication rates for several published series, representing each postoperative strategy, are shown in Table 54-5. Reported morbidity and mortality across these studies varies widely; however, comparisons between di erent studies are di cult given a lack of standardization in disease severity or criteria used for operative management. Further complicating any comparison between studies is the relative lack of standard de nitions in the earlier literature; many cases of pancreatic necrosis were likely incorrectly considered "pancreatic abscess. As noted earlier, the de nitions proposed at the 1992 International Symposium on Acute Pancreatitis in Atlanta (see Table 54-3) have proven useful for comparing data between studies and for standardizing treatment indications. However, these standards have only recently been applied and are not universally utilized. As a result of this lack of standardization and other di culties listed earlier, recommendations for techniques of debridement and postdebridement management have not been uniform in the literature. No method is universally accepted, and the techniques have not been adequately compared in a randomized prospective fashion. Technique of Debridement Prior to surgical debridement, accurate preoperative imaging is essential. It is of paramount importance to identify all areas of necrosis or uid collections to properly guide surgical exploration. Exploration of the pancreatic bed may be initiated via either a bilateral subcostal or midline incision. Some authors83 have strongly advocated an approach to the lesser sac via the left side of the transverse mesocolon to avoid the dense in ammatory process that can obscure tissue planes between the stomach and transverse colon. If the anatomic plane between the stomach and colon is obliterated by in ammation, the transmesocolic approach avoids inadvertent injury to these structures. If patent, these vessels may often be interrupted without consequence as the colon is supplied with collateral vasculature. An additional advantage of the transmesocolic approach is that drains may be placed in a dependent position after debridement. Other investigators have advocated an approach to the lesser sac via the gastrocolic ligament. Necrotic tissue should separate easily from the surrounding tissue, without extensive dissection. Additional exposure may also entail a release of the hepatic and splenic exures of the colon. Debridement should therefore be limited to all clearly necrotic tissue that is easily separable from surrounding structures. Hemorrhage from di use oozing from in amed retroperitoneal tissues is not uncommon; hemostasis may require packing of the cavity. Rapid hemorrhage from the intraoperative rupture of a major blood vessel, such as the splenic artery or vein, may require suture ligature. Precise vascular control in an in amed tissue eld can prove di cult if not impossible. If such is the case, hemostasis may require prolonged manual compression and possibly multiple sutures. As the in ammatory mass is exposed during the course of the debridement, it may become necessary to extend the intra-abdominal dissection to fully expose all necrotic tissue. For necrosis of the head, improved exposure may be achieved either through the right side of Several authors have demonstrated very favorable results with debridement and closed drainage. For this reason, the completeness of the initial debridement is the most crucial factor in avoiding subsequent re-explorations. In contrast to the open packing technique, a concerted e ort is made to perform a complete debridement and drainage of uid collections at the rst surgical procedure. All necrotic tissue is debrided unless it is densely adherent to vital structures, and all spaces involved on preoperative imaging are opened and debrided. Drains are removed one at a time beginning 6­10 days after surgery in an e ort to allow the cavity to collapse. If Penrose and closed-suction drains are used together, closed-suction drains are removed last, and only when their output is minimal. Reported mortality for debridement and closure over drains has been as high as 40%. Recurrent pancreatic infection is an acknowledged complication of this technique, with early series reporting a recurrence rate of 30­40%. In addition, 20% required postoperative imageguided drainage of residual or recurrent uid collections. While most necrotic debris is easily separated from surrounding structures, some borderline tissue may not be so easily debrided. Presumably, pancreatic necrosis is an ongoing process, and further demarcation of necrotic tissue after an initial debridement can result in a mass of particulate matter that is inadequately removed by sump drainage. Furthermore, the persistence of necrotic tissue is combined with the persistent postoperative leakage of activated pancreatic enzymes from the necrotic and in amed tissue into the retroperitoneum. For this reason, some authors have advocated a process of open packing, or "marsupialization," by which recurrent pancreatic debridement is facilitated. Advocates of open packing have preferred to access the lesser sac via the gastrocolic ligament, which may provide a more direct access to the entire pancreatic bed for future packing. Pancreatic debridement using blunt nger dissection is employed, with wide exposure of all areas of retroperitoneal necrosis. However, unlike procedures with planned closed packing, no e ort should be made to remove every identi able piece of necrotic tissue at the rst procedure; rather, only tissues that are easily separated by blunt dissection should be dissected. Complete removal of all necrotic tissue is accomplished by multiple re-explorations and blunt debridements, limiting blood loss. After debridement, the stomach and colon may be covered with a nonadherent gauze to prevent debridement of healthy tissue during dressing changes. Laparotomy pads or other gauze may be placed directly within this area, and some authors have recommended presoaking these packs in iodinated solutions. Some surgeons will suture the gastrocolic ligament to the skin, creating an inverted cone with the base consisting of the divided gastrocolic ligament at the skin level and the point at the pancreatic bed. However, in the setting of acute in ammation this cavity may be ill-de ned, and suturing to the skin is generally not necessary. Drainage tubes are used for technique of closed drainage or postoperative saline lavage; for open packing technique, pancreatic bed is packed with sterile bandages. Alternatively, some have used a separate retroperitoneal incision through which to bring packs, closing the abdominal incision. Planned re-explorations are performed in the operating room at 2­3 day intervals for additional debridement. Although the majority of necrotic tissue is debrided with the rst e ort, signi cant amounts of tissue may be removed at the fourth or even fth debridement procedure. In some cases, the open packing procedure may be combined with delayed closure over lavage catheters and continuous closed lavage of the lesser sac and abscess cavity. Catheters are gradually withdrawn over weeks after it is demonstrated that there is no pancreatic stula. Debridement and Continuous Closed Postoperative Lavage of the Lesser Sac After an initial pancreatic debridement, small amounts of residual necrotic tissue are inevitably present. Furthermore, the persistent soilage of the retroperitoneum with pancreatic enzymes and in ammatory mediators may also contribute to persistent systemic in ammation and sepsis. Removal of residual necrotic tissue, bacteria, and biologically active substances is therefore proposed to decrease persistent in ammation. Chapter 54 Management of Acute Pancreatitis 1113 While some have advocated open packing and planned repeated operations to accomplish this goal, others report success with continuous postoperative high-volume lavage of the lesser sac. Beger et al have written extensively on the procedure of debridement and continuous closed postoperative lavage. Postoperative lavage is facilitated by the insertion of two to ve large double-lumen tubes. After drain placement, the gastrocolic ligament may be sutured to form a closed compartment in the lesser sac. Continuous lavage is undertaken with hyperosmolar, potassium-free dialysate at approximately 2 L/h, although irrigation with normal saline is also employed. Comparison of Techniques Used in Pancreatic Debridement As noted earlier, the bene ts of various techniques of pancreatic debridement and postdebridement care have been debated in the literature. No strict criteria have been proposed to adequately select patients for di erent procedures, and the optimal method of debridement has not been examined in a prospective fashion. A number of case series have been reported in which patients with either pancreatic necrosis or severe acute pancreatitis have undergone pancreatic debridement followed by either closure over drains, open packing and redebridement, or closure over lavage catheters with postoperative continuous lavage (see Table 54-5). As seen in this table, reports of postoperative complications and mortality vary widely across di erent studies. Preoperative disease severity is di cult to standardize across di erent reports, as are the criteria for operative management employed. Earlier studies did not employ currently accepted criteria of disease severity, and the presence of pancreatic infection is not universally documented via preoperative studies. One small single-institution retrospective study compared surgical outcomes in 86 patients with acute pancreatitis after debridement and closed drainage, debridement with open packing, or debridement with continuous closed postoperative lavage. However, as pancreatic necrosis and the time of operation are not documented, it is not clear that these results are applicable to current practice. Several series in the literature have quoted a high rate of recurrent pancreatic sepsis and high rate of reoperation when the technique of debridement and closure over drains is used. However, the Massachusetts General Hospital experience with the closed drainage technique reports a mortality of 6. Others have suggested that the open packing technique might be particularly useful in patients with a larger mass of necrotic tissue. Length of hospital stay, which is not commonly reported in di erent series, has been suggested to be prolonged after open packing. In this series, Ashley et al demonstrated that most patients were managed with closed drainage. Of these patients, 31 (86%) were managed with debridement and closure over drains, 1 received postoperative irrigation, and 4 required open packing and planned re-exploration. Nineteen patients (34%) developed complications, including 9% each with pancreatic or enteric stulas, and 15% with endocrine or exocrine insu ciency. Of patients managed with closure over drains, only four (13%) needed re-exploration due to inadequate persistent illness and presumed inadequate debridement. When early operation is mandated, open packing or lavage may be necessary to deal with the consequences of ongoing necrosis. If operation can be delayed, debridement with closed drainage and sometimes even internal drainage may be adequate. Minimally Invasive Approaches Although mortality after open pancreatic debridement has decreased in recent years, many series still demonstrate a mortality rate of approximately 15%; in addition, the mortality in patients with established organ failure may exceed 75%. Given the considerable morbidity, organ failure, and mortality associated with traditional open pancreatic debridement, some investigators have suggested that minimally invasive surgical procedures may be used successfully with pancreatic necrosis. Avoiding open debridement has the theoretical advantage of minimizing activation of systemic in ammatory processes and reducing respiratory and wound complications. In recent years there has been a proliferation of reports describing minimally invasive approaches in necrotizing pancreatitis.

Rarely virus 3 game online safe 100 mg minomycin, intestinal necrosis secondary to desmoplastic occlusion of the mesenteric vessels may develop antibiotics for dogs bacterial infections 100 mg minomycin sale, leading to initial presentation as a surgical emergency virus names minomycin 50 mg buy line. However antibiotic diarrhea generic 50 mg minomycin otc, for carcinoids arising in other areas of the gut antibiotics for uti in 3 year old discount minomycin 100 mg mastercard, multiple tumors are observed in 30­40% of patients. Gastrointestinal carcinoids have the capacity to elicit a marked desmoplastic reaction in the mesentery of the small bowel. Appendiceal carcinoids, even at a small size, may cause appendicitis due to luminal compression; hence, early diagnosis of appendiceal carcinoid is common. For jejunoileal carcinoids smaller than 1 cm, there is a 20­30% incidence of nodal and hepatic spread. Watery diarrhea, at times explosive and associated with cramping, may occur in some patients. Attacks may be spontaneous or precipitated by stress, alcohol, a large meal, or sexual intercourse. Flushing, a 5- to 10-minute sensation of heat associated with facial and truncal erythema, is the most common nding and a ects approximately 80% of patients. Diarrhea occurs in most patients and is likely related to serotonin release, as serotonin antagonists can e ectively treat this symptom. As the disease progresses, the brotic plaque sti ens, leading eventually to right heart failure. Carcinoid syndrome is due to metastatic disease in either the liver or retroperitoneum. Monoamine oxidase in the liver metabolizes serotonin to metabolites without vasomotor activity, one of the major e ector hormones. Carcinoid syndrome occurs when metabolically active tumor is present in a site without portal drainage, such as a bronchial carcinoid or retroperitoneal tumor, or when hepatic metastatic tumor burden exceeds the capacity of hepatic monoamine oxidase to metabolize serotonin. Patients with gastrointestinal carcinoids that drain into the portal circulation must have metastatic disease prior to the development of the syndrome. Management of patients with carcinoid syndrome due to metastatic hepatic tumor burden is optimized by utilization of surgical, imaging-guided interventional procedures and medical therapies. Given the relatively slow growth of carcinoid tumors, including metastatic disease, surgical debulking of extensive hepatic disease or formal hepatic resection for resectable metastases can improve symptoms and prolong life. Five- and 10-year survival for patients with residual abdominal tumor and hepatic metastases approaches 60%. While in general the initial surgery for resection of carcinoid tumor burden, including hepatic metastases, should attempt to debulk as much tumor as possible, the procedure must be planned to avoid catastrophic injuries such as those to the superior mesenteric vessels that could lead to short gut syndrome. Carcinoid tumors express somatostatin receptors, and the somatostatin analogues inhibit vasoactive peptide release from carcinoid tumors. Some studies have demonstrated a tumorstatic or tumor reduction e ect after the administration of somatostatin, although these latter ndings have not been consistently reproduced. Chemotherapeutic agents for the treatment of metastatic carcinoid tumor include doxorubicin, 5- uorouracil, dacarbazine, and interferon-, with response rates of approximately 20%. Somatostatin analogues bind to somatostatin receptors on carcinoid tumors with high a nity. A characteristic nding is the presence of a large spaceoccupying mass, often with evidence of central necrosis and compression of adjacent organs and calci cations. Biologically aggressive tumors are large tumors with a high mitotic index, while tumors with benign features are small and exhibit a low mitotic index. Tumors are thus classi ed into very low- to high-risk for malignant potential, a classi cation that has prognostic signi cance. Wedge resection of gastric lesions of amenable shape and position in the gastric wall provides equivalent outcomes to partial gastrectomy without the negative side e ects of partial gastrectomy. Activation of kit leads to phosphorylation of a receptor substrate protein, initiating an intracellular phosphorylation cascade leading to nuclear activation of transcription events, resulting in cell proliferation and survival. While complete regression of tumor is rare, partial regression of disease and arrest of progression of disease can be achieved for durable intervals with continuous treatment in up to 80% of patients. E cacy of treatment can be predicted and followed using uorodeoxyglucose-positron emission tomography scanning; these highly biologically active tumors will become metabolically silent with imatinib therapy in those patients with responsive tumors. Emergence of resistant clones within tumors has been recognized with prolonged use of imatinib. Adenocarcinoma of the small bowel: review of the National Cancer Data Base, 1985­1995. Small bowel tumors: an analysis of tumor-like lesions, benign and malignant neoplasms. Adenocarcinoma of the small bowel: a study of 37 cases with emphasis on histologic prognostic factors. Primary small intestinal tumors: increased incidence of lymphoma and improved survival. Malignant small bowel neoplasms; histopathologic determinants of recurrence and survival. Solitary versus multiple carcinoid tumors of the ileum: a clinical and pathological review of 68 cases. Surgical treatment of carcinoid tumors of the small bowel, appendix, colon and rectum. Trans-catheter arterial chemoembolization as rst-line treatment for hepatic metastases from endocrine tumors. Although overall survival advantage was not achieved in this trial, adjuvant trials in North America and Europe continue. Metastatic Lesions to the Small Bowel While metastases to the small bowel are rare as a group, they are in fact more common than primary small bowel neoplasms. Metastatic spread can occur by direct invasion, hematogenous spread, or intraperitoneal seeding. Colon and pancreatic cancers are the most common primary sites for direct invasion. Hematogenous metastases spread most frequently from lung and breast carcinoma or melanoma. Peritoneal seeding may arise from any intra-abdominal malignancy including gastric, hepatic, ovarian, appendiceal, and colonic primary tumors. Segmental intestinal resection or bypass to relieve hemorrhage, obstruction, or pain is indicated except in the most terminal stages of disease. While cases of prolonged survival after intestinal resection of solitary metastases have been reported, progression of metastatic disease is more common. Management of patients with carcinomatosis, regardless of tumor origin, remains challenging. Endoscopic luminal stents for obstructing duodenal lesions may o er short-term palliation, while intestinal bypasses and decompressive gastrostomy tubes are indicated for patients with advanced or more distal disease to enhance palliative care. Autopsy showed that the quince had obstructed the appendiceal lumen, resulting in appendiceal necrosis and perforation. For the next few centuries, such cases of appendicitis were typically diagnosed at autopsy. Amyand is credited with the rst appendectomy in 1736, when he operated on a boy with an enterocutaneous stula within an inguinal hernia. At birth, the appendix is located at the tip of the cecum, but, because of unequal elongation of the lateral wall of the cecum, the adult appendix typically originates from the posteromedial wall of the cecum, caudal to the ileocecal valve. Young age is a risk factor, as nearly 70% of patients with acute appendicitis are younger than 30 years. Although less common in people older than 65 years, acute appendicitis in the elderly progresses to perforation more than 50% of the time. Burkitt14 found an increased incidence of appendicitis in Western countries compared to Africa, as well as in wealthy, urban communities compared to rural areas. He attributed this to the Western diet, which is low in dietary ber and high in re ned sugars and fat, and postulated that low- ber diets lead to less bulky bowel contents, prolonged intestinal transit time, and increased intraluminal pressure. Burkitt theorized that the combination of rm stool leading to appendiceal obstruction and increased intraluminal pressure causing bacterial translocation across the bowel wall resulted in appendicitis. In examining appendixes removed for reasons other than appendicitis, he found fecaliths to be more prevalent in Canadian (32%) than in South African (4%) adults. In a group of patients with appendicitis, fecaliths were more common in Canadians (52%) than in South Africans (23%). Of note, however, the majority of patients with appendicitis in his study did not have evidence of a fecalith. Wangensteen extensively studied the structure and function of the appendix and the role of obstruction in appendicitis. Although appendiceal obstruction is widely accepted as the primary cause of appendicitis, evidence suggests that this may be only one of many possible etiologies. First, some patients with a fecalith have a histologically normal appendix, and the majority of patients with appendicitis show no evidence for a fecalith. Taken together, these studies imply that obstruction is but one of the possible etiologies of acute appendicitis. When the pain becomes constant, it may localize to other quadrants of the abdomen due to an alteration in appendiceal anatomy as in late pregnancy or malrotation. In patients with a retrocecal appendix, the pain may never localize until generalized peritonitis from perforated appendicitis occurs. Urinary or bowel frequency may be present due to appendiceal in ammation irritating the adjacent bladder or rectum. Because appendicitis is so common, a high index of suspicion for appendicitis is warranted in all patients with abdominal pain. Perforated Appendicitis It is a commonly held belief that if left untreated, appendiceal in ammation will progress inevitably to necrosis, and ultimately to perforation. In one study of the natural history of appendicitis, the authors questioned patients undergoing appendectomy for suspected appendicitis about their duration of symptoms. However, 20% of cases of perforated appendicitis presented within 24 hours of the onset of symptoms; one of those patients had symptoms for only 11 hours. Although concern for perforation should be present when evaluating a patient with more than 24 hours of symptoms, the clinician must remember that perforation can develop more rapidly. Some authors have questioned whether some perforations in acute appendicitis are attributable to delay in diagnosis after a patient seeks medical attention. Temple and colleagues showed that patients with perforated appendicitis were operated on more quickly than those with nonperforated appendicitis (6. When acute appendicitis has progressed to appendiceal perforation, other symptoms may be present. Patients will often complain of two or more days of abdominal pain, but their duration of symptoms may be shorter, as previously Presentation Perhaps the most common surgically correctable cause of abdominal pain, the diagnosis of acute appendicitis remains di cult in many instances. Some of the signs and symptoms can be subtle to both the clinician and the patient and may not be present in all instances. Arriving at the correct diagnosis is essential, however, as a delay in diagnosis may allow progression to perforation and signi cantly increased morbidity and mortality. Incorrectly diagnosing a patient with appendicitis, although not catastrophic, often subjects the patient to an unnecessary operation. If nausea and vomiting precede the pain, patients are likely to have another cause for their abdominal pain, such as gastroenteritis. Classically, the pain migrates to the right lower quadrant as transmural in ammation of the appendix leads to in ammation of the peritoneal lining of the right lower abdomen. Movement or Valsalva maneuver often worsens this pain, so that the patient typically desires to lie still; some patients describe pain with every bump in the car or ambulance ride to the hospital. Higher temperatures and shaking chills should again alert the surgeon to other diagnoses, including appendiceal perforation or nonappendiceal sources. When questioned, patients who have appendicitis commonly report anorexia; appendicitis is unlikely in those with a normal appetite. Most patients with perforated appendicitis present with symptoms related to the in amed appendix itself or to a localized intraperitoneal abscess from perforation. For instance, abscesses can also form in the retroperitoneum due to perforation of a retrocecal appendix, or in the liver from hematogenous spread of infection through the portal venous system. An intraperitoneal abscess could stulize to the skin, resulting in an enterocutaneous stula. Pylephlebitis (septic portal vein thrombosis) presents with high fevers and jaundice and can be confused with cholangitis; it is a dreaded complication of acute appendicitis and carries a high mortality. Because appendicitis is so common, these rare presentations should alert the surgeon to the possibility of appendicitis. Because of the various anatomic locations of the appendix, however, it is possible for the tenderness to be in the right ank or right upper quadrant, the suprapubic region, or the left lower quadrant. Patients with a retrocecal or pelvic appendix may have no abdominal tenderness whatsoever. In such cases, rectal examination can be helpful to elicit right-sided pelvic tenderness. Multiple signs can be detected on physical examination to contribute to the diagnosis of appendicitis. Psoas sign, pain with exion of the leg at the right hip, can be seen with a retrocecal appendix due to in ammation adjacent to the psoas muscle. In cases of perforated appendicitis, patients can look gravely ill, appearing ushed with dry mucous membranes and considerable elevations in temperature or pulse. If the perforation has been walled o by surrounding structures to create an abscess or phlegmon, a mass may be palpable in the right lower quadrant. If free intraperitoneal rupture has occurred, the patient can have signs of generalized peritonitis with diffuse rebound tenderness. Because the di erential diagnosis of appendicitis is extensive, patients should be queried about certain symptoms that may suggest an alternative diagnosis. Surgeons must also remember that a previous appendectomy does not de nitively exclude the diagnosis of appendicitis, as "stump appendicitis" (appendicitis in the remaining appendiceal stump after appendectomy), although rare, has been described.

Studies show that the blood supply to the ducts can be thought of having three elements: a erent arteries antibiotics for acne make acne worse buy minomycin without a prescription, marginal arteries virus your current security settings order minomycin without a prescription, and the epicholedochal plexus antibiotic biogram buy minomycin overnight delivery. In canine models antibiotics effective against strep throat minomycin 100 mg order free shipping, bile duct ligation results in an elevation of bile duct pressure that is immediate and sustained and is accompanied by an increased bile duct diameter and formation of high local concentrations of bile salts at the canalicular membrane bacteria blood buy generic minomycin 100 mg. On pathologic staining 2 weeks after ligation, there is evidence of increased synthesis of collagen and proline hydroxylase activation. Recently, an animal model of bile duct injury demonstrated healing in traumatized bile duct tissue to occur in a mode of overhealing, implicating myo broblasts as the main cause of contracture of scar and stricture of the bile duct. Injuries and strictures of bile ducts occur less commonly in association with other operative procedures. After cholecystectomy, common bile duct exploration is the next most frequently associated procedure with stricture, typically occurring at the site of choledochotomy or an impacted stone. Procedures requiring biliary-enteric anastomoses may be complicated by postoperative stricture. Typically, these procedures involve choledochoenteric or hepaticoenetric anastomosis in such cases as reconstruction after pancreaticoduodenectomy, bile duct resection for mid­bile duct tumors, and after excision of choledochal cysts. Gastrectomy and hepatic resection are the most common nonbiliary operations associated with postoperative strictures. Injuries associated with gastrectomy typically occur during pyloric and proximal duodenal dissection associated with closure of the duodenal stump or with creating a Billroth I gastroduodenostomy. Injuries during hepatic resection often take place during dissection of the hepatic hilum. Bile duct injury and stricture is also associated with hepatic transplantation, pancreatic procedures, and penetrating or blunt trauma. Finally, the recurrence of stricture after an initial attempt at repair is not uncommon and may occur over a decade following initial repair. Minor injuries to the bile duct include lacerations of the bile duct, clip placement on an intact bile duct, injury via electrocautery, or avulsion of the cystic duct. A number of classi cation systems or major bile duct strictures have been presented, with the traditional classi cation being that described by Bismuth. Classi cation of bile duct strictures based on the level of the stricture in relation to the con uence of the hepatic ducts. Intraoperative cholangiography will also diagnose bile duct injuries at the time of cholecystectomy and may minimize injury, allowing early repair. After open cholecystectomy, only 10% of injuries are suspected after the rst week, but nearly 70% are diagnosed within the rst 6 months after operation. Large series reviews have demonstrated that less than onethird of major bile duct injuries are detected at the time of injury during laparoscopic cholecystectomy. In most cases the injury is associated with uncontrolled bile leakage into the peritoneal cavity, while in others the duct is completely ligated by clip placement leading to obstructive jaundice usually without cholangitis. Patients with signi cant bile leaks generally present within the rst week after operation with abdominal pain, distention, nausea, vomiting coupled with fever, or other signs of sepsis. Prompt investigation is required if patients have bilious drainage from incision sites or from intraoperatively placed drains. Bile leaks result in either biliary ascites with associated chemical peritonitis if allowed to drain freely into the abdominal cavity or, alternatively, bile can become loculated resulting in biloma. In the latter scenario, presentation is more subtle with low-grade fever and localized abdominal pain. Because signi cant abdominal complaints are uncommon after uncomplicated laparoscopic cholecystectomy, all patients with such symptoms should be appropriately evaluated without delay for possible bile leak to prevent progression to frank sepsis. Failure to recognize a major bile leak or to institute appropriate treatment can result in life-threatening sepsis and the development of multisystem organ failure. In a recent series of 200 major bile duct injuries treated at e Johns Hopkins Hospital, three patients were transferred to this tertiary care center and died of complications of sepsis secondary to delayed or inadequate treatment. Patients with a slowly evolving stricture may have nonspeci c abdominal complaints, jaundice, pruritus, cholangitis, or derangements in liver function tests. In addition, patients with an isolated right sectoral hepatic duct injury may present with a history of unexplained fevers, pain, or generalized malaise. Less often, patients can present with painless jaundice, which can be confused with a malignant stricture. Abdominal distention and pain may be seen in patients with bile peritonitis or focal tenderness if the patient presents with a collection or abscess. Hepatomegaly may be present in patients with chronic biliary obstruction or possible splenomegaly if there is any portal hypertension from portal venous injury or severe underlying hepatocellular damage. Patients with postoperative bile leak or cholangitis will also have an elevated white blood cell count, pyrexia, or occasionally frank sepsis. Patients with postoperative bile duct strictures typically reveal a stereotypical biochemical pro le of cholestasis. In particular, liver function tests typically consist of an elevated alkaline phosphatase and normal or slightly elevated liver transaminases (alanine and aspartate aminotransferases). In rare cases, patients with long-term obstruction will present late in the course of disease with cirrhosis, diminished serum albumin, and abnormal coagulation studies from altered hepatic synthetic function. De nitive diagnosis for bile duct strictures and injuries requires radiographic imaging. Ultrasound has little value in assessing the extent of a stricture and is unhelpful if the biliary tree is decompressed. Last, sinography, typically performed by injecting water-soluble contrast via operatively placed drains, can de ne the biliary anatomy and the source of bile leakage. Cholangiography currently remains the gold standard for evaluating the biliary tree. In these cases, the biliary leak may be e ectively controlled with the use of an endoprosthesis. Most cases of major bile duct injury, however, are associated with complete duct transection, and the cholangiogram via the retrograde endoscopic route will demonstrate a normal distal bile duct terminating in misapplied clip(s) devices. Percutaneous biliary drainage catheters will also be useful at the time of operative repair as a guide for dissection and identication of the transected bile duct, which is often retracted high into the liver hilum. Finally, in those cases in which biliary-enteric continuity exists, percutaneous catheters allow access for balloon dilation. Endoscopic retrograde cholangiopancreatogram with multiple clips across the common bile duct without visualization of the proximal biliary tree in a patient with total transection of the common bile duct during laparoscopic cholecystectomy. Signi cant arterial injury associated with major bile duct injury has been increasingly reported in recent years. While this injury may cause bleeding at the time of operation, the arterial injury often is unnoticed, usually resulting in arterial occlusion or less commonly a hepatic artery pseudoaneurysm. In a large study by Stewart et al63 on combined right hepatic artery and bile duct injury, there were 7 pseudoaneurysms compared to 77 right hepatic artery occlusions. Some authors believe if arterial injury has occurred, biliary reconstruction should be delayed to decrease the risk of late stricture recurrence. In the early postoperative period, patients with a bile leak associated with a bile duct injury are often either septic due to intra-abdominal infections or otherwise manifesting a systematic in ammatory response from chemical peritonitis associated with the bile leak. Treatment and control of sepsis may require broad-spectrum parenteral antibiotics, percutaneous biliary drainage, and percutaneous or, rarely, operative drainage of bilomas. Once sepsis is controlled, there is no hurry in proceeding with surgical reconstruction of the bile duct injury. Most biliary stulae can be controlled with the combination of proximal biliary decompression and external drainage. After early control and clinical improvement, the patient may be discharged home for several weeks to permit return of overall health and for the resolution of in ammation in the periportal region. It should be stressed that despite the belief of many surgeons that a suspected bile leak warrants urgent reoperation, exploration with an attempt at repair should be avoided early after presentation with a bile leak. In this situation exploration often reveals marked in ammation associated with bile spillage and small, decompressed bile ducts retracted high into the porta hepatis, making recognition of the injury and repair virtually impossible. Instead of proceeding to urgent exploration, a more prudent approach is to de ne biliary anatomy via preoperative cholangiography and to control the bile leak with percutaneous stents. Early operative intervention to deal with bile collections or ascites is not usually required because the intraperitoneal bile either can be drained percutaneously or is simply absorbed by the peritoneal cavity. Delayed reconstruction, with facilitation by percutaneous biliary catheters, allows for the most favorable operative results especially when concurrent hepatic artery injury is suspected. Patients who present with a biliary stricture remote from the initial operation usually experience symptoms of cholangitis that necessitate urgent cholangiography and biliary decompression. If the native bile duct is intact, endoscopic drainage with stent placement can sometimes be achieved. If a prior hepaticojejunostomy has been performed, transhepatic biliary drainage will be necessary for diagnosis. Both parenteral antibiotics and biliary drainage are central to controlling sepsis. Preoperative biliary decompression in patients presenting Chapter 50 Choledochal Cyst and Benign Biliary Strictures 1045 with jaundice without cholangitis has not been demonstrated to improve outcome. Complications of an unsuccessful operative procedure include bile leak resulting in uid collection or abscess, recurrent stricture with stones or sludge and potentially cholangitis, or biliary cirrhosis. To this end, the ideal technical procedure results in a tension-free, mucosa-to-mucosa repair to a segment of uninjured bile duct. Ideally, surgeons should also seek to maintain ductal length by not sacri cing tissue. Options for operative repair may include end-to-end repair, Roux-en-Y hepaticojejunostomy, or choledochoduodenostomy. If injury to the bile duct is recognized at the time of initial cholecystectomy, the surgeon should consider his or her ability to technically perform immediate reconstruction and should consider seeking the counsel and assistance of a more experienced surgeon. Studies show that immediate open repair by an experienced surgeon is associated with reduced morbidity, shorter duration of illness, and lower cost. If the surgeon is unable to repair the injury and competent help is unavailable, drains should be placed to control any bile leak and the patient referred immediately to a tertiary specialty center. When the surgeon suspects an injury or variant anatomy, biliary anatomy must be clearly de ned using intraoperative cholangiography and/or careful dissection, being cautious to avoid additional injury or devascularizing the bile duct. Conversion from laparoscopic to open cholecystectomy is often necessary to properly identify anatomy and the injury. Segmental or accessory duct injuries where the diameter of the bile duct is less than 3 mm and where the bile duct does not communicate with the major duct system or drain a large segment of hepatic parenchyma on cholangiography may be ligated. Bile ducts that are 4 mm or larger in diameter or when the cholangiogram shows sectoral or lobar drainage, then the ducts must be operatively repaired, as they likely drain multiple hepatic segments or an entire liver lobe. Immediate intraoperative repair is indicated in most cases for a major injury to the common hepatic or common bile duct. Partial common duct transections, involving less than 180-degree circumference of the biliary tree, may be closed primarily over a T-tube using interrupted absorbable sutures. In general, this technique is used for partial transections of the bile duct, when there has been no associated loss of duct length. Primary reconstruction of the bile duct, however, should be used very selectively and be avoided when the injury is near the bifurcation or when duct approximation cannot be accomplished without tension. A generous Kocher maneuver should be done to mobilize the duodenum out of the retroperitoneum and should be used to alleviate tension at the repair. In at least one series, a 100% restricture rate following primary end-to-end repair has been reported. In this situation, the distal bile duct should be oversewn, the injured tissue in the proximal end debrided, and then a biliary-enteric end-to-side anastomosis to the Roux-en-Y jejunal limb. Transhepatic Silastic biliary stents should be placed to control potential anastomotic leaks and for postoperative cholangiography. A perianastomotic drain should also be placed in all cases so that any potential postoperative leak is well-controlled. Biliary injuries that are not appreciated in the intraoperative period may present in the rst few days. Any elective repair should generally occur only after preoperative clinical optimization of the patient, and exact anatomy of the biliary system has been identi ed. In this situation, the result of reconstruction is almost always better if the de nitive repair is made well after the leak and the consequent intra-abdominal in ammation and sepsis are controlled with percutaneous biliary drainage. Biliary spillage and marked in ammation can obscure elds and can make identi cation of ducts di cult making urgent early laparotomy prior to biliary decompression problematic. Finally, the patient should be clinically stabilized prior to elective repair to correct uid and electrolyte balances, anemia, and malnutrition. In patients who present with biliary stricture weeks to months after cholecystectomy, identi cation of the biliary system is also essential. Patients with a stricture and symptoms of cholangitis should be treated with broad-spectrum antibiotics until sepsis is controlled, followed by biliary decompression with transhepatic percutaneous catheter placement. Intraoperatively, biliary anatomy must be carefully de ned followed by exposure of healthy proximal bile ducts. A biliary-enteric anastomosis is performed using a mucosa-to-mucosa technique in a tension-free manner. End-to-end anastomosis after excision of the stricture or area of injury is not prudent because of the loss of bile duct length and associated brosis. Signi cant loss of bile duct length is also a strict contraindication to performing choledochoduodenostomy, which is unlikely to be performed in a tensionfree fashion and is also associated with duodenal stula if leak occurs. For strictures where there is more than 2 cm of healthy common hepatic duct present (Bismuth I), a simple end-to-side biliary-enteric anastomosis will su ce. Often, a wedge of liver may need to be resected until an adequate duct can be found to do a biliary-enteric anastomosis. Preoperatively placed stents act as intraoperative aids for de ning anatomy, especially if the stricture is located proximally. Stents left in place after reconstruction also allow postoperative cholangiography and control early anastomotic leaks in the immediate postoperative period.

Smooth muscle tumors of the colon are rare and occur most commonly in the form of a pedunculated leiomyoma of the muscularis mucosa antimicrobial therapy inc buy minomycin with american express. Leiomyosarcomas antibiotics for acne and eczema purchase 50 mg minomycin overnight delivery, which consist histologically of spindle cells that resemble smooth muscle cells antibiotic with steroid order minomycin 100 mg on-line, are even less frequent but are characterized by an extremely aggressive and rapidly fatal growth pattern virus 792012 minomycin 100 mg order otc. Whenever possible antibiotic resistance stewardship order 50 mg minomycin with amex, oncologic resection and adjuvant chemotherapy are the treatment of choice. Endometriosis may involve the colon or rectum in approximately 15­20% and may mimic colonic carcinoma. When endometrial tissue extends through to the colonic mucosa, biopsy may be mistaken for adenocarcinoma. Locally advanced tumors from noncolonic primary cancers may directly invade the colon and cause symptoms suggestive of colon cancer (bleeding, obstruction, stula). Carcinomas from other primary sites may metastasize to the colon and occasionally mimic a primary colon cancer. Metastases originate most commonly 748 Part V Intestine and Colon from lobular breast cancer, stomach cancer, ovarian cancer, malignant melanoma, and leukemia, the latter of which can be diagnosed by the hematopoetic in ltrates. It is about 5­6 ft (125­150 cm) long and can be divided into the cecum with the appendix, the ascending colon, the transverse colon, the descending colon, the sigmoid colon, and the rectum. De nitions of where the sigmoid colon ends and the rectum begins have not always been uniform. For a safe surgical technique, the relationship of the colon with adjacent structures, mostly in the retroperitoneum, has to be fully understood. Only the transverse colon and the sigmoid colon are fully peritonealized and have a free mesocolon; the ascending colon and the descending colon, including both exures, are partially located in the retroperitoneum and therefore reside in proximity to essential anatomic structures. Unless a patient presents with a tumor complication (eg, bowel obstruction, bleeding, perforation, or stula formation), symptoms mostly are subtle or uncharacteristic and vague. As the stool in the proximal colon is still liquid or at most semisolid, proximal colon tumors may grow to relatively large size before they cause an obstruction. Pelvic or anal pain is an ominous sign because it may occur with increasing size, perforation, or sphincter invasion of a rectal cancer. Any large bowel obstruction, bleeding per rectum, gas or stool passage other than through the anus, or peritoneal signs should raise the index of suspicion for a colorectal malignancy until proven otherwise. Several other conditions and diseases have to be considered in the di erential diagnosis. Bleeding per rectum may also be found in hemorrhoids and other benign anorectal conditions, diverticular disease, arteriovenous malformations, endometriosis, and proctitis or colitis. However, even if one of these benign diseases is found on clinical evaluation, the symptoms should not be attributed automatically to them before a malignant disease of the large intestine has been ruled out. Because symptoms are not reliable for the prevention or early detection of colorectal cancer, risk-adjusted screening programs for otherwise asymptomatic individuals (as discussed in an earlier section of the chapter) are crucial in order to achieve a reduction in cancer mortality. Not only management planning in a situation with acute cancer complications should include strategies to alleviate symptoms and minimize the morbidity from the complication but also should provide an oncologically adequate treatment for the tumor. History and Physical Examination A careful history and physical examination remain the cornerstone in all patients presenting with gastrointestinal symptoms. Awareness of possible underlying diseases and genetics that predispose to colorectal cancer is of utmost importance not only for the management of the individual patient but also for adequate counseling of potentially a ected family members. A careful physical examination follows to identify any palpable tumor masses and/or signs of tumor complication or dissemination. Presence of peritoneal signs such as guarding with local direct and rebound tenderness or percussion tenderness may indicate a tumor perforation. A digital rectal examination and proctoscopy are mandatory to rule out involvement of the rectum or to determine the exact distance of a distal and possibly palpable tumor from the anal verge, its axial and circumferential extent, and the mobility of the tumor against surrounding structures (eg, sacrum, prostate/ vagina, anal sphincter muscle). In addition, the checking nger should assess the rectal vault for the presence of stool, blood, or melena. Particular attention has to be paid to patients who present with acute symptoms in an emergency setting. Developing sepsis or acute and recurrent blood loss potentially aggravate these symptoms and may result in a severe volume loss. Alarming signs are a decrease in urine output, tachycardia, hypotension, elevated temperature, short-term weight loss, standing skin folds, dry oral mucosa, and acidosis. Immediate uid and volume resuscitation has to parallel the further clinical workup and monitoring. Blood tests have to be interpreted with caution; for example dehydration may result in an arti cially high hematocrit and mask a signi cant loss of blood. In addition, the precise position of a lesion seen on colonoscopy may not be determined adequately unless one of the two absolute landmarks (dentate line, or the carpetlike villi of the terminal ileum) is in direct proximity. Relative landmarks (eg, assessment of the endoscopic shape of the colon, liver and spleen shadow, ileocecal valve, appendiceal ori ce) or the length of instrument insertion from the anal verge vary considerably and should not be used. In practical terms, however, this handicap may be overcome by India Ink tattooing of the area of a lesion for better identi cation during surgery or repeat endoscopy. Contrast enemas are an especially valuable adjunct to colonoscopy in patients with near-obstructing colonic lesions. Furthermore, they have the advantage of more accurately visualizing the anatomic position of a colonic lesion (road map). Ideally, a barium-air double-contrast technique will be used after bowel cleansing; however, in a more acute setting, particularly if there is suspicion of a colonic perforation, administration of barium is contraindicated (risk of barium peritonitis), and instead, a water-soluble contrast material (eg, Gastrogra n [diatrizoate meglumine]) should be used in a single-column technique. Although preoperative histologic con rmation of a colon cancer is preferable, an unequivocal and characteristic morphology on a barium enema or endoscopy is su cient evidence to proceed to surgery. Contrast studies have the advantages of a better passage through even severely obstructing lesions and that they commonly reach the cecum. In addition, they are superior in visualizing diverticula or a suspected stula between the colorectum and other pelvic organs. While there is certainly a lot of promise for both new approaches, which likely will continue to improve over time, the de nite role of these techniques awaits further clari cation. Both endoscopic and radiological techniques are available for evaluation of the colon and rectum, and each type of examination has inherent strengths and weaknesses. However, they do not provide complete information about the rest of the colon, and therefore a complementary study is indicated before surgery. Furthermore, the exible sigmoidoscope is notorious for giving inaccurate measurements of the level of the tumor. Determination of the rectal versus colonic location of the tumor should be done with a rigid proctoscope. Colonoscopy clearly has evolved as the method of choice because of its high sensitivity in detecting tumors and its ability to take biopsies. It provides accurate information about the entire colonic mucosa (ie, polyps, synchronous cancer, colitis, melanosis, and diverticula), and it may be used to remove synchronous neoplastic polyps. Apart from determining the circumferential and longitudinal extent of a colonic lesion, colonoscopy addresses functional aspects such as active bleeding or an imminent obstruction by cauterization, laser ablation, or placement of a self-expanding metallic wall stent, hence allowing for turning an emergency situation into an elective one. Unfortunately, incidental extracolonic ndings may precipitate a large number of unwarranted tests, which add tremendous cost to the health care system. First, patients with a signi cant burden of liver disease (>50% liver replacement) may carry a prohibitive risk for general anesthesia and should be treated with chemotherapy either in advance of surgery or instead of it. In order to rule out extrahepatic, in particular pulmonary metastases, a chest x-ray in two planes commonly is su cient, although the yield of this test is relatively low. Its greatest utility at the current time is (1) in patients where systemic disease is suspected (eg, high tumor markers) but not proven, and (2) under special circumstances where the presence of previously unknown tumor manifestations (eg, recurrence vs scar tissue, solitary vs multiple liver metastases, and presence of extrahepatic metastases) would have an impact on the treatment approach (eg, operative vs nonoperative). Furthermore, any precursor pathology with statistical risk for cancer (eg, large sessile polyp in an otherwise healthy individual or dysplasia in a patient with ulcerative colitis) that cannot be managed nonoperatively is an indication for surgery. In a palliative setting, the goal is to prolong the period of symptom-free survival. Local tumor control generally is the primary treatment objective to prevent local tumor complications, that is, Preoperative laboratory tests are aimed at providing evidence for pathophysiologic e ects of the tumor and ruling out 752 Part V Intestine and Colon obstruction, perforation, stula formation, bleeding, and pain. Even in the presence of distant metastases in the liver or lung, resection of the primary tumor remains a reasonable priority. Because solitary or a limited number of metastases in the liver or lung often may be treated surgically by partial organ resection or metastasectomy with a cure rate of up to 35%, their presence should not necessarily alter the surgical approach to do a curative resection at the primary site. However, if there are extensive metastases or peritoneal carcinomatosis and cancer cure is not a reasonable goal, alleviation of symptoms and prevention of impending local complications, for example by restoring the intestinal continuity, is the best palliation. Only after the extent of the operation has been de ned can the method and approach to be used be discussed as to whether the procedure is only suitable for an open laparotomy approach or laparoscopy may be reasonable and bene cial. In contrast to rectal cancer, neoadjuvant treatment (ie, preoperative chemoradiation) is not indicated in the overwhelming majority of colonic cases. In patients with resectable metastases, preoperative chemotherapy followed by a combined colon and liver resection may be an attractive alternative to a staged resection and may help in assessing the tumor response to a particular chemotherapy regimen. Only rarely is a locally very advanced lesion treated with chemotherapy in anticipation of an otherwise unresectable mass. Meta-analysis studies have strongly questioned whether there is a true causal e ect present. Furthermore, a randomized trial comparing the use of autologous versus allogenic blood in patients undergoing colorectal resections did not show any statistical di erence in prognosis. Traditionally, bowel cleansing was considered an essential preparation to any elective colon surgery. However, recent prospective, randomized, controlled studies and metaanalyses comparing mechanical preparation versus no preparation for elective colorectal surgery have failed to demonstrate any appreciable decrease in infection rates, anastomotic leaks, or mortality rates in patients undergoing mechanical bowel preparation. In the absence of a consensus regarding the best regimens (ie, orthograde cleansing alone or combined with retrograde enemas), the choice often is a matter of personal preference. Elderly patients, who are more prone to this adverse e ect, therefore should preemptively be given intravenous uids and electrolytes. Perioperative administration of prophylactic antibiotics aims at reducing colonic and dermal bacterial concentrations and is considered a crucial component of colorectal procedures. Prophylaxis has to be distinguished from therapeutic antibiotic treatment in patients who already have an established infection. Prophylaxis (ie, in patients who do not primarily su er from an infection) should be targeted, adequately dosed, and short (ie, start within 1 hour of the incision and be limited to less than 24 hours) in order to When a patient is considered an operative candidate, several preparatory steps need to be addressed. Blood-spearing surgical techniques have reduced the need while the threshold to transfuse has substantially increased. While the risk of blood-borne infections is very low, there is some controversy as to the immunologic e ect of blood transfusions on the overall prognosis of colorectal cancer. Because the initial report that transfusion may be associated with an increased likelihood of recurrence,211 many Chapter 36 Tumors of the Colon 753 minimize antibiotic side e ects and propagation of resistances. Coverage should include both aerobic bacteria (eg, Staphylococcus, Escherichia coli, Klebsiella, Proteus, etc) and anaerobic bacteria (eg, Bacteroides fragilis, Clostridium). Intravenous administration of broad-spectrum antibiotics is the most common form of prophylaxis and includes several acceptable antibiotic selections: (1) single antibiotics (ertapenem, piperacillin-tazobactam); (2) combination of two antibiotics (second- or third-generation cephalosporin + metronidazole, uoroquinolone + metronidazole, clindamycin + aminoglycoside, clindamycin + quinolone, clindamycin + aztreonam); or (3) triple combinations such as amoxicillin-clavulanic acid + metronidazole + aminoglycoside. Oral antibiotics (eg, metronidazole combined with nonabsorbable neomycin) in conjunction with a mechanical bowel preparation may yield similar results but may increase the risk of nosocomial superinfections, in particular with Clostridium di cile. Special considerations according to national guidelines have to be followed for prophylaxis in patients at risk for endocarditis (eg, patients with mechanical heart valve). Both pharmacologic and physical prophylaxis (eg, pneumatic calf compression) have been proven to be e ective,221 but the use of pharmacologic prophylaxis has recently been endorsed by a task force recommendation. Intermittent pneumatic calf-compression boots are an alternative to heparin that has been demonstrated to be equally successful in preventing deep venous thrombosis and possessing the advantage of no risk of increased bleeding. Anticoagulated patients who need to take warfarin (eg, owing to a mechanical heart valve) should be switched perioperatively to intravenous heparin to allow for stopping the warfarin medication and antagonizing its e ect with vitamin K. Four hours before incision, the heparin may be discontinued and resumed within 24 hours postoperatively with a stepwise increase in the dose. After induction of general anesthesia, bladder catheterization should be performed in all major cases to adequately monitor the urine output peri- and postoperatively. In selected patients with a previous history of colorectal or pelvic dissections, placement of ureteral stents allows better intraoperative identi cation and protection of these crucial structures. Laparoscopic colon procedures do not routinely need ureteral stents; however, selective use of lighted ureteral stents during challenging laparoscopic procedures may facilitate identi cation of these structures. Placement of a nasogastric tube is not necessary on a routine basis for patients undergoing resection of the colon or rectum and should be avoided unless they present with a complete or partial bowel obstruction. In patients who may need permanent or temporary placement of an ostomy during the surgical procedure, preoperative marking of the ideal stoma site by a stoma nurse helps to facilitate postoperative ostomy handling by the patient. E ective pain management is an important factor not just for patient comfort but to reduce the incidence of postoperative pulmonary complications. Preoperative placement of epidural analgesia is a very valuable strategy, which, in addition to its pain-relieving e ect, promotes the earlier resumption of postoperative bowel function as a result of its suppression of sympathetic nerves. Because the lymphatics run with the arterial supply of the colon, the primary artery supplying the segment of the colon to be resected is divided at its origin. Ligation at the origin of the vessel ensures inclusion of apical nodes, which may convey prognostic signi cance for the patient. Extended resections for con ned tumors outside of high-risk patients have not been shown to confer additional survival bene t230; however, tumors located in "border zones" should be resected with both neighboring lymphatics to encompass possible bidirectional spread. If a tumor is adherent to or invading an adjacent organ such as the kidney or small bowel, an en bloc resection should be performed where technically feasible. Because adhesions between the tumor and adjacent organ may not necessarily be in ammatory, but, because of carcinoma, mere division or "pinching" of a tumor from an adjacent organ is not an acceptable surgical technique because it may reduce the chance of cure. When synchronous cancers are present in the colon, an extended resection or even total colectomy, with ideally only one anastomosis, should be performed. Occasionally, two separate resections (eg, right hemicolectomy and low anterior resection) with two anastomoses are preferable to preserve colon length and to avoid postcolectomy diarrhea. For all left-sided colonic resections, it is advisable to place the patient in a modi ed lithotomy position, which gives access to the anus (eg, for a stapled anastomosis) and allows an assistant or the surgeon to stand between the legs for retraction or an excellent view to mobilize the splenic exure, respectively. For an open procedure, the peritoneal cavity is most commonly entered through a midline laparotomy incision. For a proctocolectomy, we usually recommend the use of an infraumbilical incision in order to provide good exposure for the pelvic dissection.

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