Influence of the new class I antiarrhythmic agent diprafenone on the end-systolic pressure-volume relationship (conductance technique)

Cardiovascular Drugs and Therapy
J ThormannM Schlepper

Abstract

To evaluate cordiodepressive risks of antiarrhythmic treatment with diprafenone, we monitored, in addition to conventional hemodynamic parameters, end-systolic pressure-volume relations to assess potential negative inotropic effects. Thirteen patients underwent hemodynamic analysis with and without the influence of diprafenone 1.5 mg/kg, both a) at rest (paced heart rate of 90 beats/min and b) during tachycardia (paced tachycardia of 160 beats/min). Left ventricular volumes increased under the influence of diprafenone, both at rest (end-diastolic volume by an average of 12%, end-systolic volume by 21%) and during tachycardia (by 15% and by 47%, respectively). Diprafenone induced a depression of left ventricular function during tachycardia only: Ejection fraction fell by an average of 25% and stroke work by 19%, while end-diastolic pressure increased by an average of 28% and systemic vascular resistance by 34%. Diprafenone caused the loops of the end-systolic pressure-volume relationship to move rightward and decreased the slope k, indicating negative entropy, both at rest and during tachycardia. Thus, since under the influence of diprafenone negative inotropic effects and depressed left ventricular function were found (while de...Continue Reading

References

Nov 1, 1978·Circulation Research·K Sagawa
Mar 1, 1987·European Heart Journal·J P BourkeR W Campbell
Aug 1, 1985·American Heart Journal·J ThormannM Schlepper
Sep 1, 1984·The American Journal of Cardiology·B J BakerJ A Franciosa
Aug 27, 1982·Deutsche medizinische Wochenschrift·H A Wester, N Mouselimis
Sep 1, 1981·American Heart Journal·R E RudeE Braunwald

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