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Shock is a life-threatening condition characterized by inadequate tissue perfusion and oxygen delivery to meet cellular metabolic demands. It represents a spectrum of circulatory failure that can rapidly progress to multi-organ dysfunction and death if not promptly recognized and treated.
Shock occurs when the cardiovascular system fails to maintain adequate tissue perfusion, leading to cellular hypoxia and anaerobic metabolism. The four main types include cardiogenic (heart failure), hypovolemic (fluid loss), distributive (vasodilation), and obstructive (impaired venous return) shock, each disrupting the balance between oxygen delivery and consumption.
Early recognition relies on identifying compensatory mechanisms such as tachycardia, altered mental status, and decreased urine output before hypotension develops. Treatment focuses on the underlying cause while supporting circulation through fluid resuscitation, vasopressors, or inotropes as indicated, with continuous monitoring of perfusion markers like lactate levels and organ function.