Right Ventricular Performance and Contractile Reserve in Patients With Severe Heart Failure

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Abstract
Background Right ventricular (RV) performance appears to be important in patients with severe heart failure. Although clinical assessments of RV function previously have been limited to load-dependent ejection phase indices, a new method has been developed using the relatively load-insensitive concepts of pressure-volume relations with automated echocardiographic measures of RV cross-sectional area as a surrogate for volume. Methods and Results Sixteen patients with New York Heart Association functional class IV heart failure and group mean left ventricular ejection fraction of 20±5% were studied. RV pressure-area loops were recorded on-line from echocardiographic measures of RV area and high-fidelity pressure during transient inferior vena caval balloon occlusions. RV contractile reserve was assessed as its functional response to an increase in dobutamine from 5.7±4.1 to 13.1±4.7 μg/kg per minute. Complete data sets were available in 13 patients. Group mean RV end-systolic elastance (E'es) and maximal elastance (E'max) increased with augmented dobutamine infusion (2.9±1.5 to 5.5±3.3 mm Hg/cm 2 and 3.3±1.6 to 6.4±3.9 mm Hg/cm 2 , respectively; P <.01 versus baseline), although individual responses were variable. During a 30-day follow-up, 9 patients remained unstable, requiring continuous intravenous inotropic therapy; 6 of these had profound deterioration requiring mechanical circulatory support. The remaining 4 patients had a comparatively good short-term outcome with clinical stability. A 100% increase in RV E'es or E'max was associated with a good short-term outcome ( P <.05). Conclusions RV performance can be assessed by pressure-area relations in patients with heart failure. RV contractile reserve in response to increases in dobutamine was associated with a good short-term outcome and may be of prognostic value in patients with severe heart failure.

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