PMID: 7025603Oct 1, 1981Paper

Characterization of left ventricular mechanical function during arrhythmias with two dimensional echocardiography. I. Premature ventricular contractions

The American Journal of Cardiology
T UchiyamaT Peter

Abstract

Two dimensional echocardiography was applied experimentally in the closed chest dog to quantitate left ventricular function during and immediately after single premature ventricular contractions induced through threshold stimulation at the apex. Coupling intervals were varied over a range from 35 to 85 percent of the R-R interval during normal sinus rhythm (920 to 980 ms). The quality of tomographic echocardiographic images during premature as well as postextrasystolic beats was found to be satisfactory for quantitating short axis section areas at end-diastole and end-systole. A systolic fractional area change was computed from two dimensional echocardiographic measurements to characterize mid ventricular cardiac function, which correlated significantly with peak left ventricular pressure and maximal first derivative of left ventricular pressure (dP/dt). Marked shortening of coupling intervals reduced fractional shortening during premature systole and enhanced the degree of potentiation during the postextrasystolic beat. By contrast, premature beats with relatively long coupling intervals caused less reduction in contraction and only minor postextrasystolic potentiation. Systolic shortening of left ventricular length as well as...Continue Reading

References

May 1, 1970·Japanese Circulation Journal·H TakadaS Yoshida
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Mar 1, 1974·The American Journal of Cardiology·L M EberR Gorlin
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Oct 1, 1960·The American Journal of Cardiology·E CORDAY, D W IRVING
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Citations

Sep 1, 1986·Medical & Biological Engineering & Computing·D J Larnard
Sep 1, 1984·Journal of the American College of Cardiology·S SaksenaR Werres

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