Joseph P. Vande Griend, PharmD, FCCP, BCPS

• Associate Professor and Assistant Director of Clinical Affairs, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado
• Associate Professor, Department of Family Medicine, University of Colorado School of Medicine, Aurora, Colorado

These focal resections have only rarely been associated with permanent neurological complications erectile dysfunction pills from india discount viagra 50 mg with amex. The reduction in seizures is greater in patients with pathologies requiring focal or lobar resections than in patients with a more widespread and diffuse pathology requiring multilobar surgery [100] erectile dysfunction self injection viagra 100 mg buy with amex. Presurgical intellectual disabilities do not predict postoperative seizure outcomes in paediatric epilepsy surgery patients [102] erectile dysfunction patanjali medicine discount viagra master card. Risks and complications of epilepsy neurosurgery are reasonably low when compared with the cognitive erectile dysfunction wellbutrin xl discount viagra 100 mg buy on-line, developmental and mortality risks of chronic suboptimal seizure control erectile dysfunction treatment ottawa 25 mg viagra purchase. Surgical mortality is less than 1% for temporal lobectomy and 1­2% for hemispherectomy. Permanent morbidity from surgical resection is generally reported to be less than 5%, with risks varying by type of procedure performed. Temporal resections are most often complicated by visual field deficits, while extratemporal resections are most often complicated by transient hemiparesis [65]. Serious complications include infarct and hemiparesis in temporal lobe resections and motor or language deficits in larger procedures. Operative morbidity and mortality rates are less than those of uncontrolled therapy-resistant epilepsy. The literature supports the notion that after epilepsy surgery, developmental quotients improve when seizures are controlled. Developmental indices before surgery predict postoperative developmental function [17,97]. Children operated on at younger ages and with epileptic spasms show the greatest increase in developmental quotient after surgery. Specific cognitive functions, such as behaviour and attention, typically impaired in parietal lobe epilepsy, are improved by epilepsy surgery as well [102]. This translates into better school performance and social adaptation after paediatric epilepsy neurosurgery. Memory and executive function do not seem to be adversely affected by epilepsy surgery in children. Furthermore, epilepsy surgery does not appear to adversely affect motor performance with regards to daily activities and level of caregiver assistance [104]. Although more longitudinal studies are needed to adequately assess cognitive and neurodevelopmental results in epilepsy surgery patients, preliminary data indicate that these faculties are improved. That said, the evidence for improvement in cognitive skills following surgery remains controversial [105,106,107]. Children, after epilepsy surgery, experience greater feelings of self-worth and social competence. Similarly, after surgery, adolescents feel better about their athletic competence and capacity for social interactions. Studies have also indicated that epilepsy surgery is cost-effective, especially for children, and allows other members of the family to engage in work and school. Conclusion Children with therapy-resistant epilepsy are at particular risk for developmental delay, cognitive regression and higher mortality rates. Early identification of intractability and referral to a paediatric epilepsy centre is crucial. Surgical intervention for these children is directed at reducing seizure frequency while minimizing neurological morbidity. Overall seizure control rates are from 65% to 80% after epilepsy neurosurgery in children. Morbidity and mortality rates are reported as less than 5%, which compare favourably with the higher mortality of therapy-resistant epilepsy over 10 years. Thus, surgery for intractable epilepsy in children should not be the treatment of last resort. Instead, it should be considered along with medical treatment to stop seizures as soon as possible to prevent epilepsy-induced disabilities in infants and children. Risk factors predicting refractoriness in epileptic children with partial seizures. Mental retardation in pediatric candidates for epilepsy surgery: the role of early seizure onset. Surgery for symptomatic infant-onset epileptic encephalopathy with and without infantile spasms. Sudden unexpected death in epilepsy: evidence-based analysis of incidence and risk factors. Neuroimaging in identifying focal cortical dysplasia and prognostic factors in pediatric and adolescent epilepsy surgery. Surgical strategies and seizure control in pediatric patients with dysembryoplastic neuroepithelial tumors: a single-institution experience. Epilepsy surgery in young children with tuberous sclerosis: results of a novel approach. Contralateral hemimicrencephaly and clinical-pathological correlations in children with hemimegalencephaly. Rapamycin suppresses seizures and neuronal hypertrophy in a mouse model of cortical dysplasia. Mammalian target of rapamycin inhibitors for intractable epilepsy and subependymal giant cell astrocytomas in tuberous sclerosis complex. Long-term effect of everolimus on epilepsy and growth in children under 3 years of age treated for subependymal giant cell astrocytoma associated with tuberous sclerosis complex. Time to pediatric epilepsy surgery is related to disease severity and nonclinical factors. Time to pediatric epilepsy surgery is longer and developmental outcomes lower for government compared with private insurance. Status epilepticus and frequent seizures: incidence and clinical characteristics in pediatric epilepsy surgery patients. Selective amygdalohippocampectomy versus anterior temporal lobectomy in the management of mesial temporal lobe epilepsy: a meta-analysis of comparative studies. Systematic review and meta-analysis of standard vs selective temporal lobe epilepsy surgery. Comparison of therapeutic effects between selective amygdalohippocampectomy and anterior temporal lobectomy for the treatment of temporal lobe epilepsy: a meta-analysis. Vertical parasagittal hemispherotomy: surgical procedures and clinical long-term outcomes in a population of 83 children. Seizure and developmental outcomes after hemispherectomy in children and adolescents with intractable epilepsy. Cognitive changes following surgery in intractable hemispheric and sub-hemispheric pediatric epilepsy. Evidence-based guideline update: vagus nerve stimulation for the treatment of epilepsy: report of the Guideline Development Subcommittee of the American Academy of Neurology. Endoscopic resection of hypothalamic hamartomas for refractory symptomatic epilepsy. Robot-assisted stereotactic laser ablation in medically intractable epilepsy: operative technique. Anesthesiological and intensive care considerations in children undergoing extensive cerebral excision procedure for congenital epileptogenic lesions. Postsurgical outcome in pediatric patients with epilepsy: a comparison of patients with intellectual disabilities, subaverage intelligence, and average-range intelligence. A follow-up study of cognitive function in young adults who had resective epilepsy surgery in childhood. Evaluation of quality of life and clinical status of children operated on for intractable epilepsy. Mood, anxiety, and incomplete seizure control affect quality of life after epilepsy surgery. It is known that with certain procedures physical side-effects are inevitable and these will be included as well as those that are unexpected. Procedures such as craniotomy carry general complications, for example haemorrhage and infection, which will be dealt with briefly. Certain groups may be more at risk, for example patients on valproate may have a low platelet level causing a bleeding disorder [1]. Modern transparency has made it possible to talk about a learning curve that is experienced in performing invasive procedures and operative techniques when new centres are set up or personnel replaced and this has a bearing on the complication rate [2]. Careful monitoring of these patients, especially their airway, is needed during the test and recovery. Invasive procedures for placing electrodes Recording and documenting seizures by videotelemetry, irrespective of the electrodes used, can be troublesome. This can result in partial status, secondary generalization of seizures and occasionally status epilepticus. These may be accompanied by confusion, for which the patient may be amnesic, or occasionally a postictal psychosis, which may require treatment in addition to the restoration of anticonvulsant medication. The possibility of introducing slow virus diseases, such as Creutzfeldt­Jacob disease, was reported with the reuse of electrodes in 1977 [7]. Most electrodes contain platinum contacts with stainless steel wires and nickel­chromium external contacts. There are a number of recent papers describing the factors that determine whether such heating occurs. There should be no contact between different electrodes and thereafter the heating depends upon the field strength of the scanner (3This more dangerous than 1. Minor invasive techniques There are three techniques, using either sphenoid, epidural peg or foramen ovale electrodes. Complications of invasive procedures for presurgical assessment Carotid amytal test this procedure is now less common; Baxendale et al. The usual procedure involves cannulation of the internal carotid arteries via the femoral artery, and is generally free of complications. The prevalence of selective cannulation of smaller vessels is hard to determine but in earlier accounts there was significant morbidity in one-third. These included arm Sphenoidal electrodes these are effectively extracranial electrodes and serious complications are rare. Foramen ovale electrodes these are placed through the foramen ovale, to lie in the subarachnoid space in the ambient cistern. The method was introduced by Wieser [18] and taken up by a number of other groups. Most centres regularly use smooth multicontact electrodes inserted through an appropriate needle. Possible complications include nerve damage during insertion, haemorrhage within the subdural or subarachnoid space (usually of no significance), misplacement of the electrode within the cerebral substance and infection. In our patients the commonest problems were facial swelling and transient pain or numbness in the trigeminal territory; a small number, less than 2%, were left with permanent numbness in trigeminal territory and only one with persistent facial pain. Known penetration of the brain with clinical consequences occurred on four occasions, two with serious consequences. In one case there was a disorder of eye movement, which recovered completely, and in the other there was a capsular haemorrhage, which resulted in a permanent hemiparesis. Stefan reported serious consequences in patients who had undergone previous temporal surgery [19]. In five of our cases there was frank meningitis, including one of unsuccessful insertion, all of which responded to appropriate treatment. Wieser reported one serious subarachnoid haemorrhage and two cases of symptomatic subarachnoid haemorrhage in 264 patients. Facial pain was experienced in 19% and other minor and transient effects in less than 10% [18]. Four of these were asymptomatic, one patient developed status epilepticus from which she eventually died, and the other with a haemorrhage into the fourth ventricle developed hydrocephalus and required a shunt [20]. Stereotactic placement of these electrodes in 26 patients has been described with one persistent buccal hypaesthesia [22]. Two who had a shift greater than 5 mm, required no treatment, but two, who had an initial shift less than 5 mm but showed increasing shift to greater than 5 mm together with neurological symptoms, required repeat craniotomies [24]. Complications at the point of electrode insertion included cortical contusions (25%), local oedema (25%) and trans-burr hole cortical herniation (35%). At the location of the electrodes complications included subdural haematoma (35%), pneumocranium and subdural hygroma [25]. Most reported series use antibiotics, as we do, and when craniotomy is performed some leave the bone flap out whereas others do not, but this seems to have no effect on the complication rate. Interhemispheric strip electrodes have the same complications as other locations [26]. Intracranial haemorrhage occurred in 4%, superficial infections in 3%, neurological infections in 2. Increased adverse events were seen with more than 67 electrode contacts and when monitoring lasted longer than 7­8 days [27]. The most frequent relevant complication (grade 3) was subdural or extradural haematoma with brain compression in 79% of these patients. Our experience is similar; in over 100 bilateral subdural strip implantations we have only encountered one problem. An acute subdural haematoma probably arose from rupture of a bridging vein associated with coughing and vomiting during recovery from anaesthetic. Ninety-three patients have been implanted in our centre (with 20, 32 or 64 contact mats) and significant complications were seen in 22 patients (23. The origin of the changes induced in the underlying brain by subdural grids is complex. Local cerebral swelling can be a problem, especially in patients who have been previously operated at that site, and in whom tedious dissection of adhesions has been necessary.

Conservative treatment can be considered if the peritonitis is localized and the symptoms are medical erectile dysfunction pump viagra 75 mg purchase otc. Broad spectrum antibiotics such as third-generation cephalosporins and metronidazole are prescribed erectile dysfunction tea buy viagra cheap. Laparoscopic direct suturing can often be performed for delayed perforation because size of perforation is often small erectile dysfunction treatment testosterone order viagra mastercard. The Japan Esophageal Society has set guidelines for the diagnosis and treatment of esophageal cancer based on the size and depth of the tumor impotence female buy viagra mastercard. A tumor within two-thirds of the luminal circumference is an absolute indication for endoscopic resection erectile dysfunction natural remedy viagra 25 mg order with amex, but a tumor beyond three-fourths of the luminal circumference is a relative indication because it carries high risk for postoperative stricture. Periodic balloon dilations [1] and a temporary stent [45] are often used to prevent postoperative stricture. Oral prednisolone started on day 3 and tapered gradually may offer some protection from stricture [46]. In this series a single session of triamcinolone (5 mg/mL) injected into the residual submucosal tissue of the ulcer bed in 0. Although effective and safe, balloon dilation does carry risk of esophageal perforation and mediastinitis [48]. Endoscopic balloon dilation is often used for treating colorectal stenosis but its effects may be not as good as that for treating esophageal stricture. Refractory rectal stricture can be treated with endoscopic radial incision of the stricture ring. Instrument assistants: (a) Prepare the equipment that may be used during the procedure. Circuit assistants: (a) Communicate with patient and finish check-in list before anesthesia. Here we introduce a workbench that we designed for instrument management during procedure. To provide patients information about fasting, bowel preparation, and help with mental preparation. Check the endoscope, including water/air injection, suction, image clarity, angle knob, white balance, etc. A whole narrow rim of the cap could be seen in the view when the cap sits the correct location. We use mixture solution (4,000 units of chymotrypsin + 5 ml of simethicone + 50 ml of saline). Tube is inserted through forceps channel; with syringe evenly constant pressure is applied to make a mist spray on the mucosa. Before withdrawing the tube, drawing back the color agents remaining in the tube with the syringe can avoid the colorings splash. When feeling any resistance during injection, communicate with operator and assist him to find out the reasons that cause the difficulty in injection. Generally, the hook keeps a vertical relationship with the base of the lesion with the tip pointing into the lumen. When switch knife, also change to the corresponding mode or parameters of the generator. Different lesions require different snares: small or large, filaments or rigid, elliptical or semicircular, etc. It is really important to control the tightness of the snare when closing the loop. Excessive heat damage would be caused by not fully closed snare, whilst tight grasp would cause mechanism cutting that results in bleeding. The shape and the size of the jaw tip varies in different models of hot biopsy forceps. Generally used in wound closure, direct suture of the perforation, endoscopic purse-string suture, close the entrance of the tunnel. Do remember to the connection part of the clip before the installation of the next clip. Two "click" sounds can be felt when closing the clip by pull back the sliding part. Push the handle to release the loop from the hook after confirms tighten the nylon ring. Insert the nylon-ring (20 or 30 mm) through the left channel, while the clip through the right channel. Clip the nylon-ring to proximal side of the defect and another one to the distal side. It is also important to control the tightness of the loop when closing the loop, tight grasp would cause cutting resulting in bleeding. Connect the bottle of the solution for submucosal injection and the pipe to the machine. Do remember to switch the electric plug when switch Hybrid knife to biopsy forceps. Intraoperative pneumoperitoneum: Get the paracentesis packages and the abdominal puncture needle. For submucosal lesions, weigh and measure the specimens before putting into 4 % formaldehyde. The aim of this resection was to achieve en-bloc resection for larger size early gastric cancers to reduce local recurrence. This would prevent accidental perforation of the muscularis with a non-insulated device. Water jet function of the endoscope helps to clear the view during the dissection, especially when bleeding occurs. This will allow a better view on the bleeding vessel and a more precise hemostasis can be achieved. The energy platform should be an electrosurgical unit with diathermy output catering for endoscopic dissection and hemostasis. The techniques of dissection and control were different for various kinds of instruments. The main advantage of using insulated tip knife is prevention of perforation during dissection at the submucosa through the ceramic tip. Commonly Endoscopic submucosal dissection allowed early gastrointestinal cancers to be resected en-bloc in one piece. Narrow band imaging magnifying endoscopy was used to distinguish margin of the lesion prior to marking. After circumferential marking, we should inject at the submucosa to increase the space and enhance submucosal dissection [56, 58, 59]. The solution for submucosal injection included a mixture of normal saline, indigo carmine, epinephrine and sodium hyaluronate. Sodium hyaluronate is a molecule with heavier molecular weight so that it will be retained in the submucosa for a longer period of time than ordinary normal saline [56, 59, 60]. For noninsulated knife, the submucosal dissection should be performed with a clear visualization over the submucosal plane. We usually use a transparent distal attachment to enhance the visualization of submucosa by pushing it between mucosa and muscularis propria. The usual method of endoscopic hemostasis included injection of epinephrine, heater probe as well as multiple endoclips. Most of the perforations could be managed by application of endoclips, and the clips used should have the distal fringe at an angle of 90°. For patients with involvement of the deep resection margin, they should be treated by salvage surgery as the risk of nodal metastasis was up to 20 % for early gastric cancers with submucosal infiltration. Narrow-band imaging system with magnifying endoscopy for superficial esophageal lesions. Comparative performance in the porcine esophagus of different solutions used for submucosal injection. Attempted endoscopic en bloc resection of mucosal and submucosal tumors using insulated-tip knives: a pilot series. Management of complications associated with endoscopic submucosal dissection/ endoscopic mucosal resection for esophageal cancer. Clinical impact of endoscopic submucosal dissection for superficial adenocarcinoma located at the esophagogastric junction. Superficial adenocarcinoma of the esophagogastric junction: long-term results of endoscopic submucosal dissection. Endoscopic submucosal dissection of gastric neoplasia involving the pyloric channel by retroflexion in the duodenum. How to manage pyloric tumours that are difficult to resect completely with endoscopic resection: comparison of the retroflexion vs. Successful outcomes of endoscopic resection for gastric adenomas and early cancers located on the pyloric ring (with video). Efficacy and safety of endoscopic submucosal dissection for colorectal neoplasia: a systematic review. Learning curve for endoscopic submucosal dissection of early gastric cancer based on trainee experience. Indication, strategy and outcomes of endoscopic submucosal dissection for colorectal neoplasm. Endoscopic assessment of invasion depth of colorectal flat lesions and its influence on choice of therapy (article in Chinese). Safe procedure in endoscopic submucosal dissection for colorectal tumors focused on preventing complications. Risk factors for incomplete resection and complications in endoscopic mucosal resection for lateral spreading tumors. Risk factors for local recurrence of superficial esophageal cancer after treatment by endoscopic mucosal resection. Effectiveness of radical surgery after incomplete endoscopic mucosal resection for early colorectal cancers: a clinical study investigating risk factors of residual cancer. Clinical outcomes of endoscopic submucosal dissection for undifferentiated or submucosal invasive References early gastric cancer. Endoscopic submucosal dissection for residual/local recurrence of early gastric cancer after endoscopic mucosal resection. Endoscopic submucosal dissection allows curative resection of locally recurrent early gastric cancer after prior endoscopic mucosal resection. Endoscopic submucosal dissection for locally recurrent colorectal lesions after previous endoscopic mucosal resection. Successful nonsurgical management of perforation complicating endoscopic submucosal dissection of gastrointestinal epithelial neoplasms. Routine coagulation of visible vessels may prevent delayed bleeding after endoscopic submucosal dissection­an analysis of risk factors. Risk factors for delayed bleeding after endoscopic submucosal dissection for gastric neoplasm. Clinical impact of second-look endoscopy after endoscopic submucosal dissection of gastric neoplasms. Endoscopic full-thickness resection of colonic submucosal tumors originating from the muscularis propria: an evolving therapeutic strategy. Endoscopic full-thickness resection without laparoscopic assistance for gastric submucosal tumors originated from the muscularis propria. Complete closure of large gastric defects after endoscopic full-thickness resection, using endoloop and metallic clip interrupted suture. Clinical features and outcomes of delayed perforation after endoscopic submucosal dissection for early gastric cancer. Predictors of postoperative stricture after esophageal endoscopic submucosal dissection for superficial squamous cell neoplasms. Widespread endoscopic mucosal resection of the esophagus with strategies for stricture prevention: a preclinical study. Usefulness of oral prednisolone in the treatment of esophageal stricture after endoscopic submucosal dissection for superficial esophageal squamous cell carcinoma. Intralesional steroid injection to prevent stricture after endoscopic submucosal dissection for esophageal cancer: a controlled prospective study. Risk of perforation during dilation for esophageal strictures after endoscopic resection in patients with early squamous cell carcinoma. Risk factors for cardiac and pyloric stenosis after endoscopic submucosal dissection, and efficacy of endoscopic balloon dilation treatment. Ono H, Kondo H, Gotoda T, Shirao K, Yamaguchi H, Saito D, Hosokawa K, Shimoda T, Yoshida S. Watanabe K, Ogata S, Kawazoe S, Watanabe K, Koyama T, Kajiwara T, Shimoda Y, Takase Y, Irie K, Mizuguchi M, Tsunada S, Iwakiri R, Fujimoto K. Oda I, Gotoda T, Hamanaka H, Eguchi T, Saito Y, Matsuda T, Bhandari P, Emura F, Saito D, Ono H. Endoscopic submucosal dissection for early gastric cancer: technical feasibility, operative time and complications from a large consecutive series. Effect of scheduled second therapeutic endoscopy on peptic ulcer rebleeding: a prospective randomised trial. Outcomes of endoscopic submucosal dissection versus endoscopic mucosal resection in management of superficial squamous esophageal neoplasms outside Japan. Endoscopic resection for early gastric cancer: one piece is better than dash to pieces. Endoscopic submucosal dissection versus local excision for early rectal neoplasms: a comparative study. Endoscopic resection (endoscopic mucosal resection/ endoscopic submucosal dissection) for early gastric cancer. Goto O, Fujishiro M, Oda I, Kakushima N, Yamamoto Y, Tsuji Y, Ohata K, Fujiwara T, Fujiwara J, Ishii N, Yokoi C, Miyamoto S, Itoh T, Morishita S, Gotoda T, Koike K. A multicenter survey of the management after gastric endoscopic submucosal dissection related to postoperative bleeding.

In type 2 plasminogen deficiency erectile dysfunction fix purchase discount viagra on-line, though the concentration of plasminogen is normal its function is reduced impotence emedicine cheap viagra 50 mg free shipping. The patient with plasminogen deficiency exhibits repeated episodes of thrombophlebitis impotence in the sun also rises buy 100 mg viagra overnight delivery, intracranial and mesenteric venous thrombosis royal jelly impotence discount viagra 75 mg on-line, and pulmonary embolism (Application Box 17 erectile dysfunction 60 year old man cheap viagra american express. Enhanced Fibrinolysis this usually occurs due to congenital or acquired loss of fibrinolytic inhibitor activity. In promyelocytic leukemia, bleeding occurs due to high level of plasmin generation and deficiency of 2-antiplasmin. This leads to increased fibrin deposition, as suggested by increased D-dimer levels. The hemostatic and fibrinolytic imbalance is increased in preeclampsia and eclampsia. Regulation of Blood Coagulation Blood coagulation at the site of injury is a life saving process as it prevents loss of blood volume. However, once the clot (fibrin-platelet plug) is formed, the process of clotting must be terminated to avoid thrombotic occlusion in the adjacent normal areas of blood vessel. If clotting remains unchecked, coagulation of blood can spread to the entire vascular tree with modest procoagulant stimulus. Fluidity of blood and absence of thrombosis (intravascular clot) are important physiological states that are essential for normal circulation and blood supply to tissues of the body. The balance between coagulation and anticoagulation is due to play of various regulatory mechanisms, as listed below: 1. When the rate of blood flow decreases, as occurs in vascular stasis, intravascular coagulation is facilitated. Thus, continuous and dynamic flow of blood should be maintained to prevent intravascular coagulation. Role of vascular endothelium: Vascular endothelium plays an important role in restricting coagulation process to the site of injury. Negative feedback by thrombin: Thrombin, which is a major mediator of blood coagulation, initiates the process of anticlotting mechanism (fibrinolysis). Role of liver: Many coagulation factors are plasma proteins, formed mainly in the liver. Also, liver plays an important role in preventing intravascular coagulation by removing activated clotting factors from blood. This hepatic clearance of activated clotting factors is accelerated when clotting is spontaneously activated. Role of platelets: In addition to its role in primary hemostasis, platelets contribute to coagulation in various ways. Thus, platelet plays an important role in activation of factor X, which is a crucial step in blood coagulation. Thus, major clotting reactions occur in close interaction with platelets (Refer to . As platelets adhesion and aggregation are localized at the injured vessel wall, platelets help in restricting clotting reactions to the site of injury. For anticoagulation therapy Anticoagulants for Blood Collection Anticoagulants are added to the blood sample especially during collection of blood by venipuncture, when whole anticoagulated blood is required for laboratory investigations. Use of heparin and fluoride (oxalated) is limited for the determination of blood gases and pH, and plasma glucose respectively. As calcium is an important cofactor for blood coagulation, chelation of calcium prevents blood to clot. Platelets also swell and disintegrate causing an artificially high platelet count, as the platelet fragments are large enough to be counted as normal platelets. Sodium, lithium, potassium and ammonium salts of heparin are commercially available. It is commonly used for osmotic fragility test, blood gas determination and pH assays. It is also commonly used in anticoagulation therapy and in preventing blood coagulation during animal experiments. Sodium Citrate Trisodium citrate is the commonly used anticoagulant in coagulation studies. For coagulation studies like determination of prothrombin time or partial thromboplastin time, 9 volumes of blood are added to 1 volume of sodium citrate solution (9: 1). Anticoagulants for Treatment (Anticoagulation Therapy) Anticoagulants are used for treatment or prevention of thrombosis (intravascular clots). Placement of mechanical heart valves as heart valve prosthesis is associated with risk of thromboembolism 3. Anticoagulants used in anticoagulation therapy are of two types: oral and intravenous. Double Oxalate As this anticoagulant contains ammonium and potassium oxalates, is called double oxalate. Potassium oxalate alone causes shrinkage of red cells whereas ammonium oxalate increases their volume. The oxalates form an insoluble complex with the calcium in the blood, and thereby prevent coagulation. Oral Anticoagulants Routinely used oral anticoagulants are vitamin K antagonists, glycosaminoglycans, inhibitors of factor Xa and inhibitors of thrombin. Sodium Fluoride Sodium fluoride is used mainly for collecting blood specimen for plasma glucose estimation. Fluoride is an inhibitor of glycolytic enzymes and thus prevents loss of Chapter 21: Blood Coagulation 207 2. They undergo post-translational -carboxylation of approximately 10 glutamic acid residues in the N-terminal Gla- domain (the domain where -carboxylation of clotting proteins takes place is called the Gla-domain). The -carboxylation of these cofactors is necessary to enable them to bind calcium and to localize enzymatic processes to a phospholipid surface like membrane of activated platelet. Protein C and protein S (the inhibitors of blood coagulation) also undergo -carboxylation and vitamin K antagonists prevent their activity by inhibiting the process. Glycosaminoglycans Oral heparin sulfate and iduronyl-glycosaminoglycan are used as anticoagulants. Therefore, selective inhibitor of Xa is a potent antithrombotic agent without affecting bleeding time as demonstrated in animal models. Inhibitors of Thrombin Many low-molecular weight selective inhibitors of thrombin have been recently identified and are under clinical trials. It directly inactivates thrombin by binding to the active site and main fibrinopeptide binding region of thrombin. It has been tried in the treatment of acute coronary syndrome, patients undergoing coronary angioplasty and deep vein thrombosis. It is mainly used as anticoagulant in patients who develop heparin-induced thrombocytopenia. Intravenous or Subcutaneous Anticoagulants Most commonly used intravenous anticoagulants are heparin and hirudin. Heparin Heparin is a glycosaminoglycan consisting of chains of alternating residues of D-glucosamine and iduronic acid. Bleeding disorders are primarily due to the defects in formation of either in temporary hemostatic plug or in definitive hemostatic plug. Therefore, initial investigations aim at differentiating these two primary defects. If it is a coagulation disorder, tests are performed to detect the deficiency of clotting factor that has caused the disease and also to assess whether the defect is in intrinsic or extrinsic system. Clotting time Prothrombin time Prothrombin consumption test Partial thromboplastin time Activated partial thromboplastin time Thrombin time Plasma recalcification time Clot retraction time Assessment of Defects in Temporary Hemostatic Plug 1. It is usually performed by two methods: capillary tube method, and Lee-White (venipuncture) method. Capillary Fragility Test this test measures the ability of the capillaries to withstand increased stress. Petechiae appear in the fore arm of the subject when the blood pressure cuff in the arm is inflated to a maximum pressure of 100 mm Hg for about 5 minutes. Prothrombin Consumption Test this test is performed to determine the quantity of prothrombin remaining in the serum after clot is formed. Increased serum prothrombin results from a quantitative or qualitative platelet deficiency. Platelet Aggregation Test An aggregating agent is added to a suspension of platelets in plasma and the response is measured turbidometrically as a change in the transmission of light by the instruments called aggregometers. Measurement of platelet aggregation is an essential part of the investigation of any patient with suspected platelet dysfunction in a modern laboratory. In this, preparation of rabbit brain emulsion (which contains tissue thromboplastin) is added to plasma in the presence of calcium. In stage 2, prothrombin is converted to thrombin which triggers the transformation of fibrinogen to fibrin. Pletelet Adhesiveness Test this test measures the ability of platelets to adhere to glass surface. When anticoagulated blood is passed through a plastic tube containing glass beads at a constant rate, some platelets will adhere to the glass beads. The percentage difference of the platelet count done prior to and after passage through the glass bead column is calculated. The platelet substitute in the form of partial thromboplastin is prepared from rabbit brain as chloroform extract. The extract is mixed with test plasma containing excess of calcium, which leads to clot formation. Clot Retraction Time It assesses the clot stability and platelet functions (for detailsof clot retraction time, refer to previous chapter). Acquired defects are more common than inherited defects and platelet defects are more common than the coagulation defects. The common acquired defects are thrombocytopenia, vitamin K deficiency, disseminated intravascular coagulation and liver failure resulting in clotting defects. The platelet substitute, in the form of partial thromboplastin, is prepared from rabbit brain. This is incubated with a contacting agent (kaolin) to provide optimal activation of the intrinsic coagulation factors. Though it is less common than von Willebrand disease, it is more common than other inherited defects of coagulation. Women are carriers and generally do not suffer from the disease as they are protected by the second X-chromosome which is usually normal. Thrombin (commercially available) is added to the plasma along with calcium and clotting time is determined. Thrombin time detects the effectiveness of the final stage of coagulation in which fibrinogen is converted to fibrin. Clinical Features the disease manifests with the bleeding tendency which appears in infancy, but in mild cases, may appear in adult life. Soft tissue hematomas and hemarthroses (bleeding into joints) leading to severe crippling hemarthropathy are highly characteristic of the disease. In mild to moderate cases, continuation of hemorrhage secondary to trauma or surgery is the feature. As platelet factor 3 acts as a cofactor for coagulation, clotting occurs in less time in platelet rich plasma than in platelet poor plasma. Attempt should be made to avoid aspirin, nonsteroidal anti-inflammatory drugs and other drugs that interfere with platelet aggregation. Clinical Features Mucocutaneous bleeding is the most commonest presentation in type 1. In type 3, patients suffer from severe bleeding and present with hemarthroses and muscle hematomas like hemophilia A. Scientist contributed In 1947, Dr Alfredo Pavlovsky, a doctor in Buenos Aires, Argentina, distinguished two types of hemophilia in his lab-A and B. He reported that the blood from some hemophiliac patients corrected the abnormal clotting time in others. This is a hemorrhagic disorder in which diffused intravascular coagulation results in defects of hemostasis. The most common procoagulant stimulus is the tissue factor (tissue thromboplastin) exposure to the blood, that activates extrinsic pathway of coagulation. In 1926, Eric von Willebrand described this bleeding disorder in both genders of 24 persons of a 66 members of family from Åland Island. Treatment Treatment is based on early diagnosis, elimination of the precipitating factors, and replacing coagulation factors and platelets. Normally, a balance is maintained between the processes of coagulation and anticoagulation and therefore thrombus is not formed. Endothelial injury: Injury to vascular endothelium occurs in chronic and sustained hypertension, ulcerated atherosclerosis, arterial diseases etc. Injured site becomes the site for platelet adhesion and aggregation and intravascular clot formation. Sluggishness of blood flow: Stasis of blood promotes thrombosis (as described above). Hpercoagulability of blood: Increased activity of procoagulants such as fibrinogen, prothrombin and other coagulants leads to thrombosis. There is also activation of secondary fibrinolysis (hence, called defibrination syndrome). Emboli are dislodged from thrombus and circulate to be lodged in microcirculation in visceral organs, such as brain (cerebral embolism), lungs (pulmonary embolism), heart (coronary embolism) and intestine (intestinal embolism). Coronary and cerebral thrombosis leads to ischemic tissue death (infarction), which causes heart attack and stroke respectively.

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Synchronization clusters of interictal activity in the lateral temporal cortex of epileptic patients: intraoperative electrocorticographic analysis. The decision as to whether or not a patient is an appropriate surgical candidate is based upon data gathered by a team of professionals. Some of the necessary information is anatomical, derived from neuroimaging, some is physiological (electroencephalography) and some is based on clinical history and seizure pattern. It is critical to choose appropriate instruments for measuring these strengths and weaknesses, as the sensitivity of the tools determines the value of the findings they produce. It is not the intention of this chapter to recommend specific tests, but rather to provide a framework that explains what functions need to be addressed and what variables are important in the selection or design of appropriate measures. Neuropsychological test results are measurements expressed in scores, thus permitting objective comparisons of many kinds, as will be discussed throughout the chapter. The information obtained through neuropsychological testing is used in several ways. The results give information about the site of epileptic focus, inferred from the pattern of cognitive dysfunction on some tasks and adequate function on others. Neuropsychological findings can reinforce, or, if the findings disagree, question data from other sources about the site of seizure focus. When disagreement with other data occurs, those discrepancies can provoke further investigation. An unsuspected atypical representation of language is sometimes exposed in this way, and discrepant or unexpected findings from memory assessment can have a direct impact on surgical management. Functional neuroimaging studies have validated and to some extent expanded the knowledge base about structure-and-function that we derive from neuropsychological test results. Neuroimaging techniques can provide information that overlaps partially with neuropsychological information, but they do not supplant it. Currently, much of the literature regarding the imaging of cortical brain functions is based on group data from healthy volunteer subjects and has limited clinical application. Performing a thorough evaluation in newly diagnosed epilepsy patients can show the cognitive effect of the epileptogenic abnormality at the earliest known stage of the disease and in the absence of drug effects, thus forming a baseline from which changes related to initiation of therapy, evolution of the disease or other factors can be assessed [1,2,3,4,5,6]. Preoperative neuropsychological measurements also form a basis for evaluating surgical outcome with respect to cognitive function by comparing performance before and after surgery. Knowledge gained from postoperative studies has also allowed another application of preoperative evaluation: prediction of surgery outcome in terms of seizure control and in terms of postoperative cognitive change/decline. Neuropsychological evaluation often overlaps with a psychosocial assessment, addressing mental health and quality of life issues that can also have a direct impact on surgical decision making; however, this important area is beyond the scope of this chapter. Determination of site of dysfunction A thorough neuropsychological evaluation typically requires 5 to 8 hours of direct contact between patient and examiner. A basic battery includes measures of intelligence, language, attention, memory, executive functions, visuoperceptual/visuospatial abilities, and some sensory functions and motor skills. Such an arsenal of tests taps function in the frontal and temporal lobes, and also parietal and more posterior regions. In this chapter, the emphasis will be on testing methods that are useful in focal, surgically treatable epilepsy. Potential pitfalls in presurgical evaluation Neuropsychological evaluation of unoperated epilepsy patients can be a challenge for a variety of reasons. Various demographic, medication and seizure-related variables have been shown to exert differential influences on performance. Some examples of demographic factors with a possible mediating role in neuropsychological functioning are gender and age, whereas seizure-related factors include age at onset of epilepsy, duration of disorder, seizure frequency, seizure spread, medications, etc. One should also be aware that some neuropsychological tests used in epilepsy may be based on findings from patients with other kinds of brain pathology. Although principles of brain function and dysfunction are the same, different pathological processes can vary from one type of brain disorder to another, and extrapolating findings may not always be appropriate. Traumatic brain injury, neoplasms, vascular disorders, toxic encephalopathies, degenerative disorders or infection are defined by specific pathological features, including the nature and extent of focal structural involvement, both cortical and subcortical, and the potential of the damaged area to affect adjacent or remote brain regions or functional networks [7]. Furthermore, the pathological substrate of epileptogenic lesions is itself heterogeneous. However, other neuropathological processes such as tumours, malformations, cerebrovascular accidents, trauma and infections are associated with epilepsy. It remains unclear whether or not hippocampal sclerosis and other seizure-inducing pathological processes at the same location may affect neuropsychological performance differently. Another potential problem is that some information underlying neuropsychological clinical practice derives from operated patients, but cognitive effects of surgical lesions are not directly comparable to the effects of brain pathology generating seizures. Deficits are often more difficult to demonstrate in unoperated than in operated patients, possibly owing to such factors as the size of the lesion (larger in the case of surgical lesions) and uniformity of surgical versus heterogeneity of epileptogenic lesions. A third problem encountered in the field is a relative lack of analogous verbal and non-verbal tests. The concept of hemispheric specialization is widely accepted in neuropsychological practice, and therefore verbal and non-verbal tests are commonly used for assessment of the dominant and non-dominant hemispheres, respectively. However, these tests have often been different in a variety of ways, introducing noise and interfering with direct comparisons of the functional abilities of the two hemispheres, especially in the clinical setting, where it is most important to compare results from the various tests within an individual patient. Last but not least are the issues of clinical utility of neuropsychological instruments and the development and publication of norms for neuropsychological tests. The number of tests proven to be effective for presurgical evaluation of patients with epilepsy is not large. Tests that have been demonstrated to distinguish among different clinical groups may not be successful on the individual level, and even when a test can distinguish among patient groups with epileptogenic lesions of different locations, the relative sensitivity versus specificity of a given measure must be determined. In addition, the field needs more published norms on its tests, to allow meaningful interpretation of results. Neuropsychological expertise depends on the use of sensitive tests and a solid database about those tests, and fortunately this is an area of growth. Overall, the field is maturing well and there are many instruments in current use for presurgical evaluation. We will provide a brief overview of some of these in the sections to follow, organized primarily by brain region and beginning with the temporal lobes, as this is the region most often implicated in surgery for epilepsy. Temporal neocortex Although memory is the hallmark of medial temporal lobe function, the temporal neocortex is involved in certain other functions that are assessed with measures that do not involve memory. The Auditory Naming Test, developed by Hamberger [13], requires naming in response to aurally presented word definitions and appears to approximate the experience of word finding more closely than do tests of picture naming. Performance on this test has been shown to be associated with a more anterior area of the left temporal lobe, making it a more appropriate test of the region to be excised in temporal lobe surgery [14]. One of the most widely used tests of language comprehension is the Token Test [15]. In contrast, Giovagnoli [16] found that patients with left or right temporal or extratemporal epilepsies all performed within a normal range on the Token Test. For the non-dominant temporal neocortex, tests of complex visuoperceptual functions are frequently used. The most widely used visuoperceptual tests include the Benton Judgment of Line Orientation, Benton Face Recognition and Hooper Visual Organization Tests. However, an association with a particular site within the brain has not been consistently demonstrated for these tests. Faces are shown in pairs on a computer screen and for each pair, subjects must indicate whether the two faces are the same or different. These are all old, and although they remain staples in neuropsychological assessment [19] their use is problematic because deficits do not arise exclusively from one hemisphere or focal region within a hemisphere. Newer tests are being introduced and may prove to be more sensitive as results of their efficacy accumulate. In this way we attempt to maximize differences between the hemispheres by using memory tasks that are polarized into the verbal or non-verbal domain, and in doing so we increase the probability that performance on our tests primarily reflects the functions of one temporal lobe. The latter consists of a complex geometric design that patients must copy, followed by a free recall test that may occur immediately and/ or after a delay. The copy task provides useful information about visuoconstructional ability, but published results on the memory component are at best contradictory. There were no significant differences between the left- and right-sided atrophy groups on any of these measures [32]. Medial temporal lobe function: memory assessment A thorough evaluation of memory is particularly important in the assessment of epileptic patients because the majority of surgical candidates have a temporal lobe focus, and memory is the most salient of temporal lobe functions. Memory issues in epilepsy is a vast topic, and the interested reader may also consult a recent book, Epilepsy and Memory [24], as it delves more deeply into this topic than can be done here. It is well known that bilateral lesions in the medial temporal lobe can result in severe global memory deficits [25], but such profound memory impairment is rare. In contrast, patients with unilateral temporal lobe dysfunction show a more restricted, material-specific deficit. Therefore, a thorough memory assessment should address each hemisphere with tasks appropriate to its specialization. The fundamental difference between the two temporal lobes is that the left (dominant) temporal lobe mediates memory for verbal material, such as names, word lists, stories or number sequences, and the right temporal lobe mediates memory for material that cannot be verbalized readily, such as faces, places, abstract designs or music. These index scores have shown significant differences between postoperative left and right temporal lobectomy patients in the expected direction. Effects of attention, comprehension and individual strategies are probably most variable on a first trial, or on an only trial, and these effects can confound memory findings. During the learning phase, stimuli are shown one at a time while subjects copy them; each learning trial is followed by a free recall test, and an additional delayed recall test is obtained 24 h later. On these tests there was a clear difference between patients with left hippocampal atrophy and those with right in the pattern of results [32]. Thus, patients with left hippocampal atrophy were impaired in retention but not learning of words, whereas right hippocampal atrophy patients showed deficient learning of designs but they did not forget what they had learned. These results show a double dissociation in unoperated patients for verbal versus non-verbal material in two tasks that were identical except for the nature of the material. This finding contrasts sharply with the lack of effect in the four measures reported above. The critical features of these more sensitive tasks are: · the material used is polarized: the abstract words are highly verbal and the abstract designs are highly non-verbal. This allows direct comparison of the efficiency of the two hemispheres, even within individual patients. These examples illustrate the importance of the choice of tasks in neuropsychological testing. Although some results in presurgical epilepsy patients have been published for these latter tasks and may be described as encouraging, their efficacy awaits further empirical confirmations. However, other studies showed its clinical utility for presurgical epilepsy patients to be very limited.

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