Baha Al-Shaikh

• Consultant in Anaesthesia, Benenden Hospital, Kent
• Visiting Professor, Canterbury Christ Church University, UK

A carbuncle consists of several furuncles developing in adj oining hair follicles and coalescing to form a con glomerate candida causes erectile dysfunction buy kamagra soft 100 mg overnight delivery, deeply situated mass with multiple drainage points erectile dysfunction treatment muse order kamagra soft online. Recurrent furunculosis (three or more episodes in 12 months) tends to occur in those with direct contact with other infected individuals erectile dysfunction doctor prescription 100 mg kamagra soft purchase free shipping, especially family members impotence 40 years buy kamagra soft. Complications Serious and sometimes fatal complications of staphylococ cal infection such as septicemia can occur erectile dysfunction young age cheap kamagra soft 100 mg with mastercard. Prevention Identifying and eliminating the source of infection is criti cal to prevent recurrences after treatment. It gradually enlarges, becomes fluctuant, and then softens and opens spontaneously after a few days to 1 -2 weeks to discharge a core of necrotic this sue and pus. Infection of the soft tissue around the nails (paronychia) may be due to staphylococci when it is acute. Laboratory Findings There may be slight leukocytosis, but a white blood cell count is rarely required. Culture of the anterior nares and anogenital area (including the rectum to test for gastroin testinal carriage) may identify chronic staphylococcal car riage in cases of recurrent cutaneous infection. Specific Measures Incision and drainage is recommended for all loculated suppurations and is the mainstay of therapy. Systemic antibiotics are usually given, although they offer little beyond adequate incision and drainage. Sodium dicloxacil lin or cephalexin, 1 g daily in divided doses by mouth for 1 0 days, is usually effective. Recurrent furunculosis may be effectively treated with a combination of cephalexin (250-500 mg four times daily) or doxycy cline (1 00 mg twice daily) for 2-4 weeks plus either rifampin (300 mg twice daily for 5 days for 2-4 weeks) or long-term clindamycin (1 50-300 mg daily for 1-2 months). Shorter courses of antibiotics (7- 14 days) plus longer-term daily 4% chlorhexidine whole body washing and intrana sal, axilla, and anogenital mupirocin may also cure recur rent furunculosis. Oral vancomycin (1 g twice daily for 5 days) can treat gastrointestinal carriage of S aureus. Family mem bers, pets, and intimate contacts may need evaluation for staphylococcal carrier state and perhaps concomitant treat ment. Stopping high-risk behavior, such as inj ection drug use, can also prevent recurrence of furunculosis. Differential Diag nosis the most common entity in the differential is an inflamed epidermal inclusion cyst that suddenly becomes red, ten der, and expands greatly in size over one to a few days. The history of a prior cyst in the same location, the presence of a clearly visible cyst orifice, and the extrusion of malodor ous cheesy rather than purulent material helps in the diag nosis. Tinea profunda (deep dermatophyte infection of the hair follicle) may simulate recurrent furunculosis. Furuncle is also to be distinguished from deep mycotic infections, such as sporotrichosis; from other bacterial infections, such as anthrax and tularemia (rare); from atypical myco bacterial infections; and from acne cysts. Hidradenitis sup purativa (acne inversa) presents with recurrent tender sterile abscesses in the axillae and groin, on the buttocks, or below the breasts. The presence of old scars or sinus tracts plus negative cultures suggests this diagnosis. Community-associated methicillin-resistant Staph ylococcus au reus transmission in households of infected cases: a pooled analysis of primary data from three studies across international settings. Importance of keen observation for the diagnosis of epidermal cysts: dermoscopy can be a useful adjuvant tool. They are common in Gardner syndrome and may be the first stig mata of the condition. Dermoscopy can aid in observ ing a tiny punctum when not visible to the naked eye. Photodermatitis is classified into four groups: primary photodermatoses that are immunologically mediated but are idiopathic in etiology, drug- or chemical induced photodermatoses, dermatoses that are worsened or aggravated by ultraviolet exposure, and genetic dis eases with mutations predisposing to photodermatitis. Primary photodermatoses include polymorphic light eruption, chronic actinic dermatitis, and actinic prurigo. Drug- or chemical-induced photodermatitis may be either exogenous or endogenous in origin. Porphyria cutanea tarda and pellagra are examples of endogenous phototoxic derma toses. Exogenous drug- or chemical-induced photodermati this manifests either as phototoxicity (a tendency for the individual to sunburn more easily than expected) or as photoallergy (a true immunologic reaction that presents with dermatitis). The sunscreen oxybenzone (a ben zophenone) is a common cause of photoallergic dermatitis. Dermatoses that are worsened or aggravated by ultraviolet exposure include systemic lupus erythematosus and derma tomyositis. Three percent of persons with atopic dermatitis, especially middle-aged women, are photosensitive. Symptoms and Signs the acute inflammatory phase of phototoxicity, if severe enough, is accompanied by pain, fever, gastrointestinal symptoms, malaise, and even prostration. Signs include erythema, edema, and possibly vesiculation and oozing on exposed surfaces. The key to diagnosis is localization of the rash to photoexposed areas, though these eruptions may become generalized with time to involve even photo protected areas. Laboratory Findings Blood and urine tests are generally not helpful unless por phyria cutanea tarda is suggested by the presence of. Inflamed lesions may be treated with incision and drainage or intra lesional triamcinolone acetamide 5 - 1 0 mg/mL. If a clear history of the use of a topical or systemic photosensitizer is not available and if the eruption is persistent, then a work-up including biopsy and light testing may be required. Photodermatitis must be differentiated from contact dermatitis that may develop from one of the many substances in suntan lotions and oils, as these may often have a similar distribution. Sensitivity to actinic rays may also be part of a more serious condition, such as porphyria cutanea tarda or lupus erythe matosus. Since the face is often involved, close monitoring for corticosteroid side effects is recommended. Systemic Measures Aspirin may have some value for fever and pain of acute sunburn. Systemic corticosteroids in doses as described for acute contact dermatitis may be required for severe photo sensitivity reactions. Patients with severe photoallergy may require immu nosuppressives, such as azathioprine, in the range of 50-300 mg/day, or cyclosporine, 3-5 mg/kg/day. Prog nosis the most common phototoxic sunburn reactions are usu ally benign and self-limited. Photodermatoses, including phototoxic and photoallergic reactions (internal and external). Complications Some individuals continue to be chronic light reactors even when they apparently are no longer exposed to photosensi tizing medications. Prevention While sunscreens are useful agents in general and should be used by persons with photosensitivity, patients may react to such low amounts of energy that sunscreens alone may not be sufficient. Photosensitivity due to porphyria is not prevented by sunscreens and requires barrier protection (clothing) to prevent outbreaks. I rregular ulceration, often on the medial aspect of the lower legs above the malleolus. Edema of the legs, varicosities, hyperpigmenta tion, red and scaly areas (stasis dermatitis), and sca rs from old ulcers support the diag nosis. Specific Measures Medications should be suspected in cases of photosensi tivity even if the particular medication (such as hydro chlorothiazide) has been used for months. General Considerations Patients at risk may have a history of venous insufficiency, either with obvious varicosities or with a past history of thrombophlebitis, or with immobility of the calf muscle group (paraplegics, etc). Because venous insuffi ciency plays a role in between 75% and 90% of lower leg ulcerations, testing of venous competence is a required part of a leg ulcer evaluation even when no changes of venous insufficiency are present. Local Measures When the eruption is vesicular or weepy, treatment is simi lar to that of any acute dermatitis, using cooling and sooth ing wet dressing. Pneu matic sequential compression devices may be of great benefit when edema is refractory to standard compression dressings. Local easures Clean the base of the ulcer with saline or cleansers, such as Saf-Clens. A curette or small scissors can be used to remove the yellow fibrin eschar; local anesthesia may be used if the areas are very tender. Overall, there is little evidence to support topical antibi otics other than cadexomer iodine for the treatment of venous insufficiency ulcerations. In dermatology clinics, metronidazole gel is used to reduce bacterial growth and odor. Red dermatitic skin is treated with a medium- to high-potency corticosteroid ointment. The ulcer is then covered with an occlusive hydroactive dressing (DuoDerm or Cutinova) or a polyurethane foam (Allevyn) followed by an Unna zinc paste boot. The ulcer should begin to heal within weeks, and healing should be complete within 4-6 months. If the patient is diabetic, becaplermin (Regranex) may be applied to those ulcers that are not becoming smaller or developing a granulating base. Full- or split thickness grafts often do not take, and pinch grafts (small shaves of skin laid onto the bed) may be effective. Cultured epidermal cell grafts may accelerate wound healing, but they are very expensive. They should be considered in refractory ulcers, especially those that have not healed after a year or more of conservative therapy. No topical intervention has evidence to suggest that it will improve healing of arterial leg ulcers. Systemic Therapy Pentoxifylline, 400 mg three times daily administered with compression dressings, is beneficial in accelerating healing of venous insufficiency leg ulcers. Zinc supplementation is occasionally beneficial in patients with low serum zinc levels. In the absence of cellulitis, there is no role for sys temic antibiotics in the treatment of venous insufficiency ulcers. The diagnosis of cellulitis in the setting of a venous insufficiency ulcer can be very difficult. The diagnosis of cellulitis should be considered in the following settings: 1) expanding warmth and erythema surrounding the ulceration with or without 2) increasing pain of the ulceration. The patient may also report increased exudate from the ulcer ation, but this without the other cardinal findings of cellu litis does not confirm the diagnosis of cellulitis. If cellulitis accompanies the ulcer, systemic antibiotics are recom mended: dicloxacillin, 250 mg orally four times a day, or levofloxacin, 500 mg once daily for l -2 weeks, is usually adequate. Routine use of antibiotics and treating bacteria isolated from a chronic ulcer without clinical evidence of infection is discouraged. If the ulcer fails to heal or there is a persistent draining tract in the ulcer, an underlying osteo myelitis should be sought. Symptoms and Signs Classically, chronic edema is followed by a dermatitis, which is often pruritic. The ulcer base may be dean, but it often has a yellow fibrin eschar that may require surgical removal. Ulcers that appear on the feet, toes, or above the knees should be approached with other diagnoses in mind. Dop pler and light rheography examinations as office proce dures are usually sufficient (except in the diabetic) to elucidate the cause of most vascular cases of lower leg ulceration. Differential Diag nosis the differential includes vasculitis, pyoderma gangreno sum, arterial ulcerations, infection, trauma, skin cancer, arachnid bites, and sickle cell anemia. When the diagnosis is in doubt, a punch biopsy from the border (not base) of the lesion may be helpful. Prevention Compression stockings to reduce edema are the most impor tant means of prevention. Prognosis the combination of limited debridement, compression dressings or stockings, and newer moist dressings will heal the majority of venous stasis ulcers within an average of 18 months. Topical growth factors, antibiotics, debriding agents, and xenografts and autografts can be considered in recalcitrant cases, but they are usually not required in most patients. The failure of venous insuf ficiency ulcerations to heal is most often related to not using the basic treatment methods consistently, rather than failure to use these specific modalities. The use of compression stockings following ulcer healing is critical to prevent recurrence, with recurrence rates 2-20 times higher if patients do not comply with compression stocking use. Prognostic factors associated with healing of venous leg ulcers: a multicentre, prospective, cohort study. The evaluation of pigmentary disorders is helped by Wood light, which accentuates epidermal pigmentation in hyperpigmented disorders and highlights depigmentation. Depigmentation, as seen in vitiligo, enhances with Wood light examination, whereas postinflammatory hypopig mentation does not. Hyperpigmentation-The disorders in this category are nevoid, congenital or acquired, and include pigmented nevi, ephelides (juvenile freckles), and lentigines (senile freckles). Hyperpigmentation occurs also in arsenical melanosis or in association with Addison disease. Melasma (chloasma) occurs as patterned hyperpigmentation of the face, usually as a direct effect of estrogens. It occurs not only during pregnancy but also in 30-50% of women tak ing oral contraceptives, and rarely in men. Hypopigmentation and depigmentation-The disor ders in this category are vitiligo, albinism, and piebaldism. Vitiligo, present in approximately 1% of the population, may be associated with other autoimmune disorders, such as autoimmune thyroid disease, pernicious anemia, diabetes mellitus, and Addison disease. Secondary Pigmentary Disorders Any damage to the skin (irritation, allergy, infection, exco riation, burns, or dermatologic therapy, such as chemical peels and freezing with liquid nitrogen) may result in hyperpigmentation or hypopigmentation. Other endogenous pigmen tary disorders are attributable to metab olic substances (eg, hemosiderin [iron]) in purpuric processes, to homo gentisic acid in ochronosis, and bile pigments.

The best results (mortality rates of 1 0-20%) are obtained when the residual myocardium contracts well and when significant coronary lesions supplying adj acent regions are bypassed erectile dysfunction exercise buy kamagra soft in india. Pericarditis the pericardium is involved in approximately 50% of infarctions being overweight causes erectile dysfunction order generic kamagra soft, but pericarditis is often not clinically signifi cant erectile dysfunction pills over the counter 100 mg kamagra soft order otc. Twenty percent of patients with Q wave infarctions will have an audible friction rub if examined repetitively erectile dysfunction lab tests kamagra soft 100 mg purchase with mastercard. Often erectile dysfunction doctors in charleston sc order kamagra soft with mastercard, no treatment is required, but aspirin (650 mg every 4-6 hours) will usually relieve the pain. Indomethacin and corticoste roids can cause impaired infarct healing and predispose to myocardial rupture, and therefore should generally be avoided in the early post-myocardial infarction period. Likewise, anticoagulation should be used cautiously, since hemorrhagic pericarditis may result. One week to 12 weeks after infarction, Dressler syn drome (post-myocardial infarction syndrome) occurs in less than 5% of patients. This is an autoimmune phenom enon and presents as pericarditis with associated fever, leukocytosis and, occasionally, pericardia! A short course of nonsteroi dal agents or corticosteroids may help relieve symptoms. Mechanical Defects Partial or complete rupture of a papillary muscle or of the interventricular septum occurs in less than 1% of acute myocardial infarctions and carries a poor prognosis. These complications occur in both anterior and inferior infarc tions, usually 3-7 days after the acute event. They are detected by the appearance of a new systolic murmur and clinical deterioration, often with pulmonary edema. The two lesions are distinguished by the location of the mur mur (apical versus parasternal) and by Doppler echocar diography. In patients remaining hemodynamically unstable or requiring continuous paren teral pharmacologic treatment or counterpulsation, early surgery is recommended, though mortality rates are high (1 5 % to nearly 1 00%, depending on residual ventricular function and clinical status). Patients who are stabilized medically can have delayed surgery with lower risks (1 0-25%), although this may be due to the death of sicker patients, some of whom may have been saved by earlier surgery. Mural Thrombus Mural thrombi are common in large anterior infarctions but not in infarctions at other locations. Arterial emboli occur in approximately 2% of patients with known infarc tion, usually within 6 weeks. Anticoagulation with heparin followed by short-term (3-month) warfarin therapy pre vents most emboli and should be considered in all patients with large anterior infarctions. It occurs 2-7 days postinfarction, usually involves the anterior wall, and is more frequent in older women. Incomplete or gradual rupture may be sealed off by the pericardium, cre ating a pseudoaneurysm. Posti nfa rction Ma nagement After the first 24 hours, the focus of patient management is to prevent recurrent ischemia, improve infarct healing and prevent remodeling, and prevent recurrent vascular events. Patients with hemodynamic compromise, who are at high risk for death, need careful monitoring and management of volume status. Calcium channel blockers have not been shown to improve prognoses overall and should not be prescribed purely for secondary prevention. Antiarrhythmic therapy other than with beta-blockers has not been shown to be effective except in patients with symptomatic arrhythmias. Although survival was not improved, amiodarone was not harmful-unlike other agents in this setting. Therefore, it is the agent of choice for individuals with symptomatic postinfarction supraventricular arrhyth mias. Cardiac rehabilitation programs and exercise training can be of considerable psychological benefit and appear to improve prognosis. For patients not undergoing cardiac catheterization, submaximal exercise (or pharmacologic stress testing for patients unable to exercise) before discharge or a maximal test after 3-6 weeks (the latter being more sensitive for ischemia) helps patients and clinicians plan the return to normal activity. Imaging in conjunction with stress testing adds additional sensitivity for ischemia and provides local izing information. Both exercise and pharmacologic stress imaging have successfully predicted subsequent outcome. One of these tests should be used prior to discharge in patients who have received thrombolytic therapy as a means of selecting appropriate candidates for coronary angiography. Secondary Prevention Postinfarction management should begin with identifica tion and modification of risk factors. Treatment of hyper lipidemia and smoking cessation both prevent recurrent infarction and death. Statin therapy should be started before the patient is discharged from the hospital to reduce recurrent atherothrombotic events. B eta-blockers improve survival rates, primarily by reducing the incidence of sudden death in high-risk sub sets of patients, though their value may be less in patients without complications with small infarctions and normal exercise tests. Beta-blockers with intrinsic sympathomimetic activ ity have not proved beneficial in postinfarction patients. Prasugrel provides further reduction in throm botic outcomes compared with clopidogrel, at the cost of more bleeding. Likewise, ticagrelor provides benefit over clopidogrel but should be used with low-dose aspirin (8 1 mg/day). Warfarin anticoagulation for 3 months reduces the incidence of arterial emboli after large anterior infarc tions and, according to the results of at least one study, it improves long-term prognosis; however, these studies were done before the routine use of aspirin and clopidogrel. Smaller randomized trials have demonstrated that patients with noninfarct-related artery disease may benefit from revascularization strategies at the time of acute myo cardial infarction care. Treatment of arrhythmias varies and can include modalities such as antiarrhythmic medications and more invasive techniques such as catheter ablation. Antiarrhythmic Medications (Table 1 0-1 3) Antiarrhythmic medications are frequently used to treat arrhythmias, but have variable efficacy and produce fre quent side effects. They are often divided into classes based on their electropharmacologic actions and many of these medications have multiple actions. The most frequently used classification scheme is the Vaughan-Williams, which consists of four classes. Three subclasses are further defined by the effect of the agents on the Purkinje fiber action potential. Class Ia medications (ie, quinidine, procainamide, disopyramide) slow the rate of rise of the action potential (Vmaxl and prolong its duration, thus slowing conduction and increasing refractoriness (moderate depression of phase 0 upstroke of the action potential). Class Ib agents (ie, lidocaine, mexiletine) shorten action potential duration; they do not affect con duction or refractoriness (minimal depression of phase 0 upstroke of the action potential). Class Ic agents (ie, fle cainide, propafenone) prolong vmax and slow repolariza tion, thus slowing conduction and prolonging refractoriness, but more so than class Ia drugs (maximal depression of phase 0 upstroke of the action potential). There are some antiarrhythmic agents that do not fall into one of these categories. Although the in vitro electrophysiologic effects of most of these agents have been defined, their use remains largely empiric. In addition, they can be lethal (sudden cardiac death) or dangerous to the extent that they reduce cardiac output, so that perfusion of the brain and myocardium is impaired. Stable supraventricular tachycardia is generally well tolerated in patients without underlying heart disease but may lead to myocardial isch emia or heart failure in patients with coronary disease, valvular abnormalities, and systolic or diastolic myocardial dysfunction. Ventricular tachycardia, if prolonged (lasting more than 1 0-30 seconds), often results in hemodynamic compromise and may deteriorate into ventricular fibrilla tion if left untreated. If the heart rate abruptly slows, as with the onset of complete heart block or sinus arrest, syncope or convulsions (or both) may result. Arrhythmias are detected either because they produce symptoms or because they are detected during monitoring. Arrhythmias causing sudden death, syncope, or near syn cope require further evaluation and treatment unless they are related to conditions that are reversible or immediately treatable (eg, electrolyte abnormalities or acute myocardial infarction). This uncertainty reflects two issues: (l) the diffi culty of reliably stratifying patients into high-risk and low risk groups; and (2) the lack of treatments that are both effective and safe. Thus, screening patients for these so called "premonitory" abnormalities is often not productive. I ntravenous Dosage Oral Dosage Therapeutic Plasma Level Route of Elim ination Side Effects Class Ia: Action: Sodium channel blockers: Depress phase 0 depola rization; slow conduction; prolong repola rization. Indications: Supraventricular tachyca rdia, ventricular tachycardia, prevention of ventricular fi brillation, symptomatic ventricular prematu re beats. Indications: Supraventricular tachyca rdia; may prevent ventricular fi brillation. Class 1c antiarrhythmic agents should therefore not be used in patients with prior myocardial infarction or structural heart disease. Catheter ablation of atrial fibrillation is more complex and usually involves complete electrical isolation of the pulmonary veins (which are often the sites of initiation of atrial fibrillation) or placing linear lesions within the atria to prevent propagation throughout the atrial chamber. This technique is considered a reason able second-line therapy (after pharmacologic treatment) for certain patients with symptomatic medication-refrac tory atrial fibrillation. Catheter ablation of ventricular arrhythmias has proved more difficult, but experienced centers have demonstrated reasonable success with all types of ventricular tachycardias including bundle-branch reentry, tachycardia originating in the ventricular outflow tract or papillary muscles, tachycardias originating in the specialized conduction system (fascicular ventricular tachycardia), and ventricular tachycardias occurring in patients with ischemic or dilated cardiomyopathy. Ablation of many of these arrhythmias can be performed from the endocardial surface via endovascular catheter placement or on the epicardial surface of the heart via a percutaneous subxiphoid approach. Catheter ablation procedures are generally safe, with an overall major complication rate ranging from 1 % to 5%. Major vascular damage during catheter insertion occurs in less than 2% of patients. There is a low incidence of perfo ration of the myocardial wall resulting in pericardia! It results from reflex changes in vagal influence on the normal pace maker and disappears with breath holding or increase of heart rate. It is common in both the young and the elderly and is not a pathologic arrhythmia. Sinus bradycardia is a heart rate slower than 60 beats/ min due to increased vagal influence on the normal pace maker or organic disease of the sinus node. In healthy individuals, and especially in patients who are in excellent physical condition, sinus bradycardia to rates of 50 beats/min or even lower is a normal finding. However, severe sinus bradycardia (less than 45 beats/min) may be an indication of sinus node pathology, especially in elderly patients and individuals with heart disease. Atrial, junctional and ventricular ectopic rhythms are more apt to occur with slow sinus rates. Sinus tachycardia is defined as a heart rate faster than 100 beats/min that is caused by rapid impulse formation from the sinoatrial node; it occurs with fever, exercise, emotion, pain, anemia, heart failure, shock, thyrotoxicosis, or in response to many medications. Alcohol and alcohol withdrawal are common causes of sinus tachycardia and other supraventricular arrhythmias. The onset and termi nation are usually gradual, in contrast to paroxysmal supraventricular tachycardia due to reentry. The rate infre quently exceeds 160 beats/min but may reach 1 8 0 beats/ min in young persons. The rhythm is generally regular, but serial 1 -minute counts of the heart rate indicate that it var ies five or more beats per minute with changes in position, with breath holding, or with sedation. In rare instances, otherwise healthy individuals may present with "inappro priate" sinus tachycardia where persistently elevated basal heart rates are not in-line with physiologic demands. Catheter ablation aimed at modi fying the sinus node to lower mean heart rate has been reported; however, recurrence rates are high. When to Refer Patients with symptoms related to bradycardia or tachycar dia when reversible etiologies have been excluded. This is a common paroxysmal tachycardia and often occurs in patients without structural heart disease. The most com mon mechanism for paroxysmal supraventricular tachy cardia is reentry, which may be initiated or terminated by a fortuitously timed atrial or ventricular premature beat. Approximately one-third of patients with supraventricular tachycardia have accessory pathways to the ventricles. The pathophysi ology and management of arrhythmias due to accessory pathways differ in important ways and are discussed sepa rately below. Atrial premature beats occur when an ectopic focus in the atria fires before the next sinus node impulse. Acceleration of the heart rate by any means usually abol ishes most premature beats. A 1: 1 relationship usually means a supra ventricular origin, except in the case of ventricular tachycardia with retrograde atrial activation. Symptoms and Signs Patients may be asymptomatic except for awareness of rapid heart action, but some experience mild chest pain, shortness of breath, diaphoresis or faintness especially when episodes are prolonged, even in the absence of asso ciated cardiac abnormalities. Episodes begin and end abruptly and may last a few seconds to several hours or longer. Treatment In the absence of structural heart disease, serious effects are rare, and most episodes resolve spontaneously. Calcium chan nel blockers should be used with caution in patients with heart failure due to their negative inotropic effects. Their longer half-life compared to adenosine may result in pro longed hypotension despite restoration of normal rhythm. Intravenous beta-blockers include esmolol (a very short-acting beta-blocker), propranolol, and metoprolol. All may be effective for virtually any type of supraventricu lar tachycardia and cause less myocardial depression than the calcium channel blockers. Although intravenous amiodarone is safe, it is usually not required and often ineffective for treatment of these arrhythmias. Mechanical Measures A variety of maneuvers have been used to interrupt epi sodes, and patients may learn to perform these themselves. These maneuvers result in an acute increase in vagal tone and include the Valsalva maneuver, lowering the head between the knees, coughing, splashing cold water on the face, and breath holding. The Valsalva maneuver is per formed with the patient semirecumbent (45 degrees), exerting around 40 mm Hg of intrathoracic pressure (by blowing through a 10 mL syringe) for at least 1 5 seconds.

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Scintig raphy with thallium-201 or technetium-based perfusion tracers will demonstrate "cold sp ots" in regions of diminished perfusion erectile dysfunction 9 code cheap kamagra soft generic, which usually represent infarc tion when the radiotracer is administered at rest impotence 20 years old 100 mg kamagra soft buy with mastercard, but abnormalities do not distinguish recent from old damage impotence in young males generic kamagra soft 100 mg buy online. The evolution of new Q waves (longer than 30 msec in duration and 25% of the R wave amplitude) is diagnostic erectile dysfunction pump implant video 100 mg kamagra soft, but Q waves do not occur in 30-50% of acute infarctions (non-Q wave infarc tions) impotence bicycle seat kamagra soft 100 mg order. Hemodynamic Measurements these can be helpful in managing the patient with sus pected cardiogenic shock. Aspirin, P2Y11 1nhibitors (Prasugrel, Ticagrelor, and Clopidogrel) All patients with def mite or suspected acute myocardial infarction should receive aspirin at a dose of 162 mg or 325 mg at once regardless of whether fibrinolytic therapy is being considered or the patient has been taking aspirin. Prasugrel is contraindicated in patients with his tory of stroke or who are older than 75 years. Patients with a definite aspirin allergy should be treated with a P2Y 12 inhibitor (clopidogrel, prasugrel, or ticagrelor). The preferred P2Y 12 inhibitors are prasugrel (60 mg orally on day 1, then 10 mg daily) or ticagrelor (1 80 mg orally on day 1, then 90 mg twice daily). Clopidogrel should be administered as a loading dose of 300-600 mg orally for faster onset of action than the 75 mg maintenance dose. With fibrinolytic ther apy, there are no randomized trial data regarding when the early use of prasugrel or ticagrelor and clopidogrel is B. In the subgroup of patients with cardiogenic shock, early catheterization and percutaneous or surgical revascularization are the preferred management and have been shown to reduce mortality. In comparative trials, it appeared to have efficacy similar to that of alteplase, but it has a longer duration of action and can be administered as two boluses 30 minutes apart. Streptokinase, commonly used outside of the United States, is somewhat less effective at opening occluded arter ies and less effective at reducing mortality. It is non-fibrin specific, causes depletion of circulating fibrinogen, and has a tendency to induce hypotension, particularly if infused rapidly. This can be managed by slowing or interrupting the infusion and administering fluids. There is controversy as to whether adjunctive heparin is beneficial in patients given streptokinase, unlike its administration with the more clot specific agents. Allergic reactions, including anaphylaxis, occur in 1 -2% of patients, and this agent should generally not be administered to patients with prior exposure. The differences in efficacy between them are small compared with the potential benefit of treating a greater proportion of appropriate candidates in a more prompt manner. The principal obj ective should be to administer a thrombolytic agent within 30 minutes of pre sentation-or even during transport. The ability to admin ister tenecteplase as a single bolus is an attractive feature B. These recommen dations are based both on the durations of therapies during the studies evaluating the stents, and the pathophysiologic understanding of the timing of endothelialization follow ing bare metal versus drug-eluting stent implantation. Treat ment with clopidogrel for longer than 1 year after drug eluting stents, therefore, should be individualized based on thrombotic and bleeding risks. The greatest benefit occurs if treat ment is initiated within the first 3 hours after the onset of presentation, when up to a 50% reduction in mortality rate can be achieved. The magnitude of benefit declines rapidly thereafter, but a 10% relative mortality reduction can be achieved up to 12 hours after the onset of chest pain. The survival benefit is greatest in patients with large-usually anterior-infarctions. The major risk factors for intra cranial bleeding are age 75 years or older, hypertension at presentation (especially over 1 80/ 1 1 0 mm Hg), low body weight (less than 70 kg), and the use of fibrin-specific fibri nolytic agents (alteplase, reteplase, tenecteplase). Although patients over age 75 years have a much higher mortality rate with acute myocardial infarction and therefore may derive greater benefit, the risk of severe bleeding is also higher, particularly among patients with risk factors for intracranial hemorrhage, such as severe hypertension or recent stroke. The combination of a reduced-dose thrombolytic given with a platelet glycopro tein lib/lila inhibitor does not reduce mortality but does cause a modest increase in bleeding complications. In patients younger than age 75, enoxaparin was given as a 30-mg intravenous bolus and 1 mg/kg subcutaneously every 12 hours; in patients age 75 years and older, it was given with no bolus and 0. This appeared to attenuate the risk of intracranial hemorrhage in the elderly that had been seen with full-dose enoxaparin. Even with anticoagula tion, 1 0-20% of reperfused vessels will reocclude during hospitalization, although reocclusion and reinfarction appear to be reduced following intervention. Activity should initially be limited to bed rest but can be advanced within 24 hours. For patients without compli cations, discharge by day 4 appears to be appropriate. Analgesia An initial attempt should be made to relieve pain with sublingual nitroglycerin. However, if no response occurs after two or three tablets, intravenous opioids provide the most rapid and effective analgesia and may also reduce pulmonary congestion. Beta-Adrenergic Blocking Agents Trials have shown modest short-term benefit from beta blockers started during the first 24 hours after acute myo cardial infarction if there are no contraindications (metoprolol 25-50 mg orally twice daily). Aggressive beta blockade can increase shock, with overall harm in patients with heart failure. Thus, early beta-blockade should be avoided in patients with any degree of heart failure, evi dence of low output state, increased risk of cardiogenic shock, or other relative contraindications to beta-blockade. Nitrates should be avoided in patients who received phos phodiesterase inhibitors (sildenafil, vardenafil, and tadalafil) in the prior 24 hours. General Measures Cardiac care unit monitoring should be instituted as soon as possible. The combination of captopril and valsartan (at a reduced dose) was no better than either agent alone and resulted in more side effects. Patients with recurrent ischemic pain prior to discharge should undergo catheterization and, if indicated, revascularization. Kidney dysfunction or hyperkalemia are contra indications, and patients must be monitored carefully for development of hyperkalemia. Calcium Channel Blockers When to Refer All patients with acute myocardial infarction should be referred to a cardiologist. Long- acting calcium channel blockers should generally be reserved for management of hypertension or ischemia as second- or third-line medica tions after beta-blockers and nitrates. Long-Term Antithrombotic Therapy Discharge on aspirin, 8 1 -325 mg/day, since it is highly effective, inexpensive, and well tolerated, is a key quality indicator of myocardial infarction care. Patients who received a coronary stent should also receive a P2Y 12 inhibitor (see Antiplatelet therapy after drug-eluting or bare metal stents, above). Patients who have received a coronary stent and who require warfarin anticoagulation present a particular chal lenge, since "triple therapy" with aspirin, clopidogrel, and warfarin has a high risk of bleeding. Vigorous medical therapy should be instituted, including nitrates and beta-blockers as well as aspirin 8 1 -325 mg/day, anticoagulant therapy (unfraction ated heparin, enoxaparin, or fondaparinux) and clopido grel (75 mg orally daily). Accelerated idioventricular rhythm is a regular, wide complex rhythm at a rate of 70- 1 00/min. It may occur with or without reperfusion and should not be treated with antiarrhythmics, which could cause asystole. Second-degree block is usually of the Mobitz type I form (Wenckebach), is often transient, and requires treatment only if associated with a heart rate slow enough to cause symptoms. Treatment is often necessary because of resulting hypotension and low cardiac output. The escape rhythm, if present, is an unreliable wide-complex idioventricular rhythm. Urgent ventricular pacing is mandatory, but even with successful pacing, morbidity and mortality are high because of the extensive myocardial damage. Patients with anterior infarction who progress to second or third-degree block even transiently should be consid ered for insertion of a prophylactic permanent ventricular pacemaker before discharge. Sinus bradycardia-This is most common in inferior infarctions or may be precipitated by medications. If accompanied by signs of low cardiac output, atropine intravenously is usually effective. Supraventricular tachyarrhythmias-Sinus tachycardia is common and may reflect either increased adrenergic stimulation or hemodynamic compromise due to hypovo lemia or pump failure. Supraventricular premature beats are common and may be premonitory for atrial fibrillation. Electrolyte abnormalities and hypoxia should be corrected and causative agents (especially aminophylline) stopped. Intravenous diltiazem (5- 1 5 mg/h) may be used if beta-blockers are contraindicated or ineffec tive. Electrical cardioversion (commencing with 100 J) may be necessary if atrial fibrillation is complicated by hypoten sion, heart failure, or ischemia, but the arrhythmia often recurs. Amiodarone (1 5 0 mg intravenous bolus and then 1 5-30 mg/h intravenously, or rapid oral loading dose for cardioversion of 400 mg three times daily) may be helpful to restore or maintain sinus rhythm. Ventricular arrhythmias-Ventricular arrhythmias are most common in the first few hours after infarction and are a marker of high risk. Ventricular premature beats may be premonitory for ventricular tachycardia or fibrillation but generally should not be treated in the absence of frequent or sustained ventricular tachycardia. Sustained ventricular tachycardia should be treated with a 1 mg/kg bolus of lidocaine if the patient is stable or by electrical cardioversion (1 00-200 J) if not. If the arrhythmia cannot be suppressed with lidocaine, procain amide (1 00 mg boluses over 1-2 minutes every 5 minutes to a cumulative dose of 750- 1 000 mg) or intravenous amiodarone (1 50 mg over 10 minutes, which may be repeated as needed, followed by 360 mg over 6 hours and then 540 mg over 1 8 hours) should be initiated, followed by an infusion of 0. These measurements permit the accurate assessment of volume status and may facilitate decisions about volume resuscitation, selective use of pressors and inotropes, and mechanical support. General measures include supplemental oxygen to increase arterial saturation to above 95% and elevation of the trunk. Morphine sulfate (4 mg intravenously followed by increments of 2 mg) is valuable in acute pulmonary edema. Diuretics are usually effective; however, because most patients with acute infarction are not volume overloaded, the hemodynamic response may be limited and may be associated with hypotension. It should be initiated only with arterial pressure monitoring; the initial dosage should be low (0. Inotropic agents should be avoided if possible, because they often increase heart rate and myocardial oxygen requirements and worsen clinical outcomes. Digoxin has not been helpful in acute infarction except to control the ven tricular response in atrial fibrillation, but it may be benefi cial if chronic heart failure persists. Up to 20% will have findings indicative of intravas cular hypovolemia (due to diaphoresis, vomiting, decreased venous tone, medications-such as diuretics, nitrates, morphine, beta-blockers, calcium channel blockers, and thrombolytic agents-and lack of oral intake). Dopamine is generally considered to be the most appropriate pressor for cardiogenic hypotension. It should be initiated at a rate of 2-4 meg/kg/min and increased at 5-minute intervals to the appropriate hemodynamic end point. At dosages lower than 5 meg/kg/min, it improves renal blood flow; at intermediate dosages (2. Dopamine may be combined with nitroprusside or dobutamine (see above for dosing), or the latter may be used in its place if hypotension is not severe. Patients with cardiogenic shock not due to hypovolemia have a poor prognosis, with 30-day mortality rates of 40-80%. Surgically implanted (or percuta neous) ventricular assist devices may be used in refractory cases. Emergent cardiac catheterization and coronary angi ography followed by percutaneous or surgical revascular ization offer the best chance of survival. Hypotension is often exacerbated by medications that decrease intravascular volume or produce venodilation, such as diuretics, nitrates, and opioids. They rarely rupture but may be associated with arterial emboli, ventricular arrhythmias, and heart failure. Surgical resec tion may be performed for these indications if other mea sures fail. Moving the patient supine immediately following the strain maneuver and passively raising their legs for an additional 15 seconds may increase effectiveness of the maneuver. Carotid sinus massage is an additional tech nique often performed by physicians but should be avoided if the patient has carotid bruits or a history of transient cerebral ischemic attacks. Firm but gentle pressure and massage are applied first over the right carotid sinus for 1 0-20 seconds and, if unsuccessful, then over the left carotid sinus. Facial contact with cold water may cause transient bradycardia and termination of sustained ven tricular tachycardia, a phenomenon known as the diving reflex. When performed properly, these maneuvers result in abrupt termination of the arrhythmia in 20-50% of cases. Cardioversion If the patient is hemodynamically unstable or if adenosine, beta-blockers, and calcium channel blockers are contrain dicated or ineffective, synchronized electrical cardiover sion (beginning at 100 J) should be performed. Medication Therapy If mechanical measures fail to terminate the arrhythmia, pharmacologic agents should be tried. Intravenous ade nosine is recommended as the first-line agent due to its brief duration of action and minimal negative inotropic activity (Table 1 0 - 1 3). Because the half-life of adenosine is less than 10 seconds, the medication is given rapidly (in 1 -2 seconds) as a 6 mg bolus followed by 20 mL of fluid. If this regimen is unsuccessful at terminating the arrhythmia, a second higher dose (1 2 mg) may be given. Minor side effects are common and include transient flushing, chest discomfort, nausea, and headache. Adenos ine may excite both atrial and ventricular tissue causing atrial fibrillation (in up to 12% of patients) or rarely ven tricular arrhythmias and therefore administration should be performed with continuous cardiac monitoring and availability of an external defibrillator. Adenosine must also be used with caution in patients with reactive airways disease because it can promote bronchospasm. When adenosine fails to terminate the arrhythmia or if a contraindication to its use is present, intravenous calcium channel blockers, including verapamil and diltiazem, may be used (Table 1 0 - 1 3). Beta-blockers or non-dihydropyridine calcium channel blockers, such as diltiazem and verapamil, are typically used first. The class Ic agents (flecainide, propafenone) can be used in patients without underlying structural heart disease. Effectiveness of the Valsalva Manoeuvre for reversion of supraventricular tachycardia.

However erectile dysfunction treatment in tampa generic 100 mg kamagra soft with visa, autopsy studies indicate that pheochromocytomas are very often undiagnosed in life cough syrup causes erectile dysfunction buy kamagra soft 100 mg lowest price. The blood pressure elevation caused by the catecholamine excess results mainly from alpha receptor-mediated vasoconstriction of arterioles erectile dysfunction protocol foods cheap kamagra soft 100 mg buy on line, with a contribution from beta- 1 -receptor-mediated increases in cardiac output and renin release impotence kidney disease kamagra soft 100 mg on-line. Chronic vasoconstriction of the arterial and venous beds leads to a reduction in plasma volume and predisposes to postural hypotension impotence australia order kamagra soft with mastercard. Hyperten sive crisis in pheochromocytoma may be precipitated by a variety of drugs, including tricyclic antidepressants, anti dopaminergic agents, metoclopramide, and naloxone. Coarctation of the aorta-This uncommon cause of hypertension is discussed in Chapter 10. Evidence of radial-femoral delay should be sought in all younger patients with hypertension. Hypertension associated with pregnancy-Hyperten sion occurring de novo or worsening during pregnancy, including preeclampsia and eclampsia, is one of the most common causes of maternal and fetal morbidity and mor tality (see Chapter 19). Estrogen use-A small increase in blood pressure occurs in most women taking oral contraceptives. How ever, a more significant increase above 140/90 mm Hg is noted in about 5% of women, mostly in obese individuals older than age 35 who have been treated for more than 5 years. Postmenopausal estrogen does not gen erally cause hypertension but rather maintains endothe lium-mediated vasodilation. Other causes of secondary hypertension-Hyperten sion has also been associated with hypercalcemia, acro megaly, hyperthyroidism, hypothyroidism, baroreceptor denervation, compression of the rostral ventrolateral medulla, and increased intracranial pressure. Over-the-counter products should also be considered, eg, a dietary supplement cur rently marketed to enhance libido contains yohimbine, an alpha-2-antagonist, which can produce severe rebound hypertension in patients taking clonidine. When to Refer Referral to a hypertension specialist should be considered in cases of severe, resistant or early-/late-onset hypertension or when secondary hypertension is suggested by screening. Angiotensin receptor agonistic autoantibodies and hypertension: preeclampsia and beyond. Complications of U ntreated Hypertension Elevated blood pressure results in structural and functional changes in the vasculature and heart. Most of the adverse outcomes in hypertension are associated with thrombosis rather than bleeding, possibly because increased vascular shear stress converts the normally anticoagulant endothe lium to a prothrombotic state. The excess morbidity and mortality related to hypertension approximately doubles for each 6 mm Hg increase in diastolic blood pressure. However, target-organ damage varies markedly between individuals with similar levels of office hypertension; home and ambulatory pressures are superior to office readings in the prediction of end-organ damage and variability in blood pressure from visit to visit predicts cardiovascular endpoints independently of mean office-based systolic blood pressure. Hypertensive Cardiovascular Disease Cardiac complications are the major causes of morbidity and mortality in primary (essential) hypertension. Hypertensive left ventricular hypertrophy regresses with therapy and is most closely related to the degree of systolic blood pressure reduction. Diuretics have produced equal or greater reductions of left ventricular mass when compared with other drug classes. Conventional beta-blockers are less effective in reducing left ventricular hypertrophy but play a specific role in patients with established coronary artery disease or impaired left ventricular function. Average daily blood pressure, not office blood pressure, is associated with progression of cerebrovascular disease and cognitive decline in older people. Clinical Findings the clinical and laboratory findings are mainly referable to involvement of the target organs: heart, brain, kidneys, eyes, and peripheral arteries. Symptoms Mild to moderate primary (essential) hypertension is largely asymptomatic for many years. Accelerated hypertension is associated with somnolence, confusion, visual disturbances, and nausea and vomiting (hyperten sive encephalopathy). Hypertension in patients with pheochromocytomas that secrete predominantly norepinephrine is usually sus tained but may be episodic. The typical attack lasts from minutes to hours and is associated with headache, anxiety, palpitation, profuse perspiration, pallor, tremor, and nau sea and vomiting. Blood pressure is markedly elevated, and angina or acute pulmonary edema may occur. In primary aldosteronism, patients may have muscular weakness, polyuria, and nocturia due to hypokalemia; malignant hypertension is rare. Chronic hypertension often leads to left ventricular hypertrophy and diastolic dysfunction, which can present with exertional and paroxysmal noctur nal dyspnea. Cerebral involvement causes stroke due to thrombosis or hemorrhage from micro aneurysms of small penetrating intracranial arteries. Hypertensive encepha lopathy is probably caused by acute capillary congestion and exudation with cerebral edema, which is reversible. Hypertensive Cerebrovascular Disease and Dementia Hypertension is the maj or predisposing cause of hemor rhagic and ischemic stroke. Cerebrovascular complications are more closely correlated with systolic than diastolic blood pressure. The incidence of these complications is markedly reduced by antihypertensive therapy. Preceding hypertension is associated with a higher incidence of sub sequent dementia of both vascular and Alzheimer types. Home and ambulatory blood pressure may be a better predictor of cognitive decline than office readings in older people. Effective blood pressure control may reduce the risk of development of cognitive dysfunction later in life, but once cerebral small-vessel disease is established, low blood pressure might exacerbate this problem. Hypertensive Kidney Disease Chronic hypertension is associated with nephrosclerosis, which accounts for about 25% of end-stage renal disease. Whether hypertension causes nephrosclerosis or results from kidney disease driven by other factors (such as diabe tes mellitus, age, obesity, and smoking) remains uncertain. Signs Like symptoms, physical findings depend on the cause of hypertension, its duration and severity, and the degree of effect on target organs. Blood pressure-Blood pressure is taken in both arms and, if lower extremity pulses are diminished or delayed, in the legs to exclude coarctation of the aorta. An orthostatic drop of at least 20/ 1 0 mm Hg is often present in pheochro mocytoma. Older patients may have falsely elevated read ings by sphygmomanometry because of noncompressible vessels. This may be suspected in the presence of Osler sign-a palpable brachial or radial artery when the cuff is inflated above systolic pressure. Occasionally, it may be necessary to make direct measurements of intra-arterial pressure, especially in patients with apparent severe hyper tension who do not tolerate therapy. Retinas-Narrowing of arterial diameter to less than 50% of venous diameter, copper or silver wire appearance, exudates, hemorrhages, or hypertensive retinopathy are associated with a worse prognosis. Aortic Dissection Hypertension is a contributing factor in many patients with dissection of the aorta. Atherosclerotic Complications Most Americans with hypertension die of complications of atherosclerosis, but antihypertensive therapy seems to have a lesser impact on atherosclerotic complications compared with the other effects of treatment outlined above. Preven tion of cardiovascular outcomes related to atherosclerosis probably requires control of multiple risk factors, of which hypertension is only one. Diagnostic Studies Additional diagnostic studies are indicated only if the clini cal presentation or routine tests suggest secondary or com plicated hypertension. These may include 24-hour urine free cortisol, urine or plasma metanephrines and plasma aldoste rone and renin concentrations to screen for endocrine causes of hypertension. Renal ultrasound will detect struc tural changes (such as polycystic kidneys, asymmetry and hydronephrosis) as well as echogenicity and reduced cortical volume, which are reliable indicators of advanced chronic kidney disease. Evaluation for renal artery stenosis should be undertaken in concert with subspecialist consultation. Summary Since most hypertension is essential or primary, few studies are necessary beyond those listed above. If conventional therapy is unsuccessful or if secondary hypertension is suspected, further studies and perhaps referral to a hyper tension specialist are indicated. Severe acute hypertensive retinopathy with disk edema, i ntrareti nal hemorrhages, nerve fiber layer infarcts (cotton-wool spots) and arteriovenous nicking. Non pha rmacologic Thera py Lifestyle modification may have an impact on morbidity and mortality. Additional mea sures, listed in Table l l -2, can prevent or mitigate hyper tension or its cardiovascular consequences. All patients with high-normal or elevated blood pres sures, those who have a family history of cardiovascular complications of hypertension, and those who have mul tiple coronary risk factors should be counseled about non pharmacologic approaches to lowering blood pressure. Approaches of proved but modest value include weight reduction, reduced alcohol consumption, and, in some patients, reduced salt intake (less than 5 g salt or 2 g sodium). Gradually increasing activity levels should be encouraged in previously sedentary patients, but strenuous exercise train ing programs in already active individuals may have less benefit. Alternative approaches that may be modestly effec tive include relaxation techniques and biofeedback. Calcium and potassium supplements have been advocated, but their ability to lower blood pressure is limited. Beyond medications and diet: alternative approaches to lowering blood pressure: a scientific statement from the American Heart Association. Aortic regurgitation may be auscul tated in up to 5% of patients, and hemodynamically insignificant aortic regurgitation can be detected by Dop pler echocardiography in 1 0-20%. A presystolic (S4) gallop due to decreased compliance of the left ventricle is quite common in patients in sinus rhythm. Pulses-Radial-femoral delay suggests coarctation of the aorta; loss of peripheral pulses occurs due to atherosclerosis, less commonly aortic dissection, and rarely Takayasu arteri tis, all of which can involve the renal arteries. Laboratory Findings Recommended testing includes the following: hemoglobin; urinalysis and serum creatinine; fasting blood sugar level (hypertension is a risk factor for the development of diabe tes, and hyperglycemia can be a presenting feature of pheo chromocytoma); plasma lipids (necessary to calculate cardiovascular risk and as a modifiable risk factor); serum uric acid (hyperuricemia is a relative contraindication to diuretic therapy); and serum electrolytes. Electrocardiography and Chest Radiographs Electrocardiographic criteria are highly specific but not very sensitive for left ventricular hypertrophy. A chest radiograph is not necessary in the workup for uncompli cated hypertension. Echocardiography the primary role of echocardiography should be to evaluate patients with clinical symptoms or signs of cardiac disease. Free smart phone applications are also available to estimate coronary heart disease risk. In general, a 20% total cardiovascular risk (which includes stroke) is equivalent to a 1 5 % coronary heart disease risk. Treatment should ideally be offered to all persons in whom blood pressure reduction, irrespective of initial blood pres sure levels, will appreciably reduce overall cardiovascular risk with an acceptably low rate of medication-associated adverse effects. Outcomes data indicate that patients with office-based blood pressure measurements that consis tently exceed 160/100 mm Hg (stage 2 hypertension) will benefit from antihypertensive therapy irrespective of car diovascular risk. Several international guidelines suggest that treatment thresholds evaluated by home-based mea surements should be lower, perhaps 1 50/95 mm Hg using home blood pressure or daytime ambulatory measure ments. However, prospective outcomes data for treatment based on measurements taken outside the clinic are lack ing. The corollary of this is that treatment thresholds might reasonably be set higher for young people with extremely low cardiovascular risk; the Canadian guidelines suggest a threshold of greater than 1 60/ 1 00 mm Hg. However, since risk may be underestimated in this population, specialist referral should be considered in younger people with stage 1 hypertension to exclude end-organ damage and to screen for secondary causes. Since evaluation of total cardiovascular risk (Table l l - 3) is important in deciding who to treat with antihypertensive medications, risk calculators are becoming essential. Goals of Treatment the blood pressure target in most patients with hyperten sion is less than 1 40/90 mm Hg. Observational studies suggest that there does not seem to be a blood pressure level below which decrements in risk taper off. However, this may not be true with respect to pharmacologically modulated blood pressure. In fact, over-enthusiastic treat ment may have adverse consequences in certain settings. There is an association between lower blood pressure and cognitive decline in elderly patients subj ected to intensifi cation of antihypertensive treatment later in life. Antihy pertensive treatment in those who are both very elderly and frail may paradoxically increase mortality. Excessive lowering of diastolic pressure, perhaps below 70 mm Hg, should be avoided in patients with coronary artery disease. On the other hand, reducing systolic pressure below 1 3 0 mm Hg in this study seemed to further lower the risk of stroke, so lower targets might be justified in patients at high risk for cerebrovascular events. Large-scale trials in hypertension have focused on dis crete end points occurring over relatively short intervals, thereby placing the emphasis on the prevention of cata strophic events in advanced disease. There is an ongoing shift in emphasis in viewing hypertension in the context of lifelong cardiovascular risk. Accordingly, treatment of per sons with hypertension should focus on comprehensive risk reduction with more careful consideration of the pos sible long-term adverse effects of antihypertensive medica tions, which include the metabolic derangements linked to conventional beta-blockers and thiazide diuretics. The Brit ish Hypertension Society guidelines recommend that statins be offered as secondary prevention to patients whose total cholesterol exceeds 1 3 5 mg/dL (3. L) if they have documented coronary artery disease or a history of ischemic stroke. In addition, statins should be consid ered as primary prevention in patients with long-standing type 2 diabetes or in those with type 2 diabetes who are older than age 50 years, and perhaps in all persons with type 2 diabetes. Low-dose aspirin (8 1 mg/day) is likely to be beneficial in patients older than age 50 with either tar get -organ damage or elevated total cardiovascular risk (greater than 20-30%). Care should be taken to ensure that blood pressure is controlled to the recommended levels before starting aspirin to minimize the risk of intracranial hemorrhage. The specific classes of anti hypertensive medications are discussed below, and guide lines for the choice of initial medications are offered. Diuretics Thiazide diuretics (Table l l -5) are the antihypertensives that have been most extensively studied and most consis tently effective in clinical trials. They lower blood pressure initially by decreasing plasma volume, but during long term therapy, their major hemodynamic effect is reduction of peripheral vascular resistance. Most of the antihyperten sive effect of these agents is achieved at lower dosages than used previously (typically, 1 2.

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