Low systemic vascular resistance state in patients undergoing cardiopulmonary bypass

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Abstract
To determine the prevalence, hemodynamic characteristics, and risk factors for the low systemic vascular resistance (SVR) state in patients who have undergone cardiopulmonary bypass. Prospective cohort study. The intensive care unit of a tertiary care hospital. Seventy-nine consecutive patients who underwent coronary artery bypass graft, mitral valve, or aortic valve procedures. None. Low SVR was defined as an indexed systemic vascular resistance (SVRi) of 5 Low SVR, a probable manifestation of systemic inflammatory response syndrome, is common in patients after cardiopulmonary bypass. These patients may respond better to a vasopressor to restore vascular tone than to volume loading to further increase cardiac index. (Crit Care Med 1999; 27:1121-1127)