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Posted by / 03-Jun-2016 14:28

Updating inheritable properties in publishing site

Introduction Hypertension is the most common risk factor for perioperative cardiovascular emergencies.Acute episodes of hypertension may arise due to the aggravation of a pre-existing chronic hypertensive condition or as de novo phenomena.Emergency, anaesthesia, intensive care and surgery are among the clinical settings where proper recognition and management of acute hypertensive episodes is of great importance.Many surgical events may induce sympathetic activity, leading to sudden elevations in BP.

In the early postanaesthesia period, hypertension often starts within 10 to 20 minutes after surgery and may persist for 4 hours.Endothelial injury accompanies severe elevations of BP resulting in fibrinoid necrosis of the arterioles with the deposition of platelets and fibrin, and a breakdown of the normal autoregulatory function.The resulting ischemia speeds the further release of vasoactive substances completing a vicious cycle.Signs and symptoms of hypertensive crisisinclude severe chest pain, severe headache accompanied by confusion and blurred vision, nausea and vomiting, severe anxiety, shortness of breath, seizures and unresponsiveness.Pathogenesis Humoral vasoconstrictors released in the hypertensive crises episodes result in a sudden increase in systemic vascular resistance.

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