To treat circulatory failures and recognize their mechanisms, we need to understand circulatory physiology. What determines systemic venous return? How does the right ventricle feed the pulmonary circulation? Where is the left ventricular preload reserve located? Four types of circulatory failure are conventionally recognized: hypovolemic, obstructive, vasoplegic and cardiogenic. One or more of these mechanisms may account for circulatory failure in septic shock. Treatment of circulatory failure requires admission to a specialized unit and continuous or discontinuous hemodynamic monitoring. Prognosis is highly dependent on rapid treatment and correction of circulatory impairment.
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