Right ventricular end-diastolic volume as a predictor of the hemodynamic response to a fluid challenge

Chest
J G Wagner, J W Leatherman

Abstract

To compare thermodilution right ventricular end-diastolic volume index (RVEDVI) and pulmonary artery occlusion pressure (Ppao) as predictors of the hemodynamic response to a fluid challenge. Prospective cohort study. Medical ICU of a university-affiliated county hospital and medical-surgical ICU of a community hospital. Twenty-five critically ill patients who had one or more clinical conditions that suggested the possibility of inadequate preload. Thirty-six fluid challenges. Fluid (saline or colloid) was administered rapidly until the Ppao rose by at least 3 mm Hg. When a patient underwent more than one fluid challenge, these were given on separate days and for different clinical indications. Responders (n=20; > or = 10% increase in stroke volume [SV]) and nonresponders (n=16; <10% increase in SV) differed with respect to baseline Ppao (10.0+/-3.4 vs 14.2+/-3.6 mm Hg; p=0.001), but not with respect to baseline RVEDVI (105+/-31 vs 119+/-33 mL/m2; p=0.22). There was a moderate correlation between RVEDVI and fluid-induced change in SV (r=0.44); the relationship between Ppao and change in SV was stronger (r=0.58). A positive response to fluid was observed in 4 of 9 cases in which RVEDVI exceeded 138 mL/m2, a threshold value that h...Continue Reading

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