Diastolic ventricular interaction in chronic heart failure

Lancet
J J AthertonM Frenneaux

Abstract

Diastolic ventricular interaction describes a situation in which the volume of one ventricle is directly influenced by the volume of the other ventricle. Such interaction is normally negligible, but it is accentuated in circumstances associated with pulmonary hypertension and volume overload. When this interaction occurs, acute volume unloading results in a reduction in right ventricular end-diastolic volume, as expected, but left ventricular end-diastolic volume paradoxically increases. Since chronic heart failure is a volume-overloaded state associated with pulmonary hypertension, we hypothesised that this interaction may be clinically important in patients with heart failure. A radionuclide technique incorporating cardiac scintigraphy was used to measure the effect of acute volume unloading, achieved by 30 mm Hg lower-body suction, on right and left ventricular end-diastolic volumes in 21 patients with chronic heart failure and 12 healthy individuals (controls). In nine heart-failure patients, there was a paradoxical increase in left ventricular end-diastolic volume in association with an expected decrease in right ventricular end-diastolic volume during lower-body suction. This response was not seen in the control group. Th...Continue Reading

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