Current drug targets
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Current drug targets · Sep 2009
ReviewEffect of beta-blockers on perioperative myocardial ischemia in patients undergoing noncardiac surgery.
Myocardial ischemia remains a major cause of morbidity in patients undergoing noncardiac surgery. The purpose of the paper was to review the evidence of the use of perioperative beta-blockers for the reduction of myocardial ischemia in patients having noncardiac surgery. ⋯ The meta-analysis shows that the use of beta-blockers, both as premedication and postoperatively, in noncardiac surgery is associated with a significant reduction in perioperative myocardial ischemia.
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Acute severe asthma is characterized by a state of airway inflammation and increased bronchiolar smooth-muscle tone that leads to increased resistance to expiration and lung hyperinflation. Despite the better knowledge of its pathophysiology, the incidence and severity of asthma in the last twenty years is increased worldwide, although with significant age and geographic variation. As a result, the number of patients requiring more intensive medical therapy has also increased. ⋯ The use of inhalational anesthetic agents for treatment of severe status asthmaticus has been documented in case reports, case series and small uncontrolled studies. Their use may be considered in any mechanically ventilated patients whose severe bronchospasm failed to respond to maximal medical treatment. In the present review article, we aim to provide a brief description of the physio-pathological and clinical features of acute severe asthma, and of the principles of treatment, focusing our attention on the use of the inhalational anesthetics in severe patients requiring mechanical ventilation and not responding to conventional therapy.
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Statins are widely prescribed cholesterol lowering agents that exert their effects by inhibiting 3-hydroxy-3methylglutaryl co-enzyme A reductase. With their modulatory effects on the atherogenic lipid profile, the role of statin therapy is expanding amidst the growing obesity epidemic. The cholesterol lowering effects of statin therapy remains central in the long term management of coronary artery disease and cerebrovascular disease. ⋯ Clinical research into plaque histology, vulnerable high risk plaques and plaque rupture has improved our insight into the pathophysiology of these acute vascular events. Non lipid lowering effects of statin, the so called pleitrophic effects, have become the focal point of investigation. This review discusses recent experimental and clinical evidence supporting the role of statin in perioperative medicine.
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Current drug targets · Sep 2009
Reducing the risk of major elective non-cardiac surgery: is there a role for levosimendan in the preoperative optimization of cardiac function?
Patients with heart failure undergoing non-cardiac surgery still have an unacceptably high morbidity and mortality. Compromised myocardial physiologic reserves in combination with extensive surgery and anesthesia appear to play a crucial role in determining high perioperative morbidity and mortality. Nevertheless, several other mechanisms and pathways such as metabolic factors, ischemia-reperfusion conditions, neurohormonal activation, inflammation and oxidative stress contribute to the adverse outcome. ⋯ At the cellular level in the heart, kidney, lung, liver as well as the gut, levosimendan exerts protective preconditioning effects secondary to activation of adenosine triphosphate (ATP)-sensitive potassium channels. Taking into account these multiple but complementary mechanisms, levosimendan appears to be a suitable agent for preoperative optimization of cardiac functions in heart failure patients undergoing major elective surgery. Nevertheless, large-scale trials are needed before final conclusions can be drawn on the use of levosimendan in this indication.
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Critical illness and particularly sepsis are associated with a significant redox imbalance resulting from an increased production of oxidant species and a decrease in endogenous antioxidant defences. In critical patients sources of oxidative stress include the mitochondrial respiratory electron transport chain, xanthine oxidase activation, the respiratory burst associated with neutrophil activation, and arachidonic acid metabolism. Several endogenous antioxidants have been identified including enzymes, like superoxide dismutases and glutathione peroxidase, vitamins and other molecules such as uric acid and bilirubin. ⋯ Melatonin is a promising molecule that deserves the attention of future research, as well as vitamin C. Further studied should also try to establish the more beneficial combination of antioxidants, as well as the doses, and the timing of administration. When such problems will be resolved hopefully results about antioxidant therapy in critical illness will be more univocal and promising.