Ejection fraction as a guide to right ventricular function

The right ventricular ejection fraction, defined as the ratio of stroke volume to right ventricular end-diastolic volume (normal value, 0.52 ± 0.07), is load dependent and thus is a crude measure of right ventricular function, particularly in cases of acutely altered afterload. Nonetheless, at lower values, it may correlate well with load-independent measures although an exponential relationship seems to exist at higher ejection fractions. The use of conductance catheters has distinct advantages over imaging techniques, as outlined above. Two other methods are appropriate to the ICU.

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