Copyright © 1992 by the European Society of Cardiology.
© 1992 The European Society of Cardiology
Haemodynamic effects of different doses of dopexamine hydrochloride in low cardiac output states following cardiac surgery
German Heart Institute Berlin 1000 Berlin 65
*Fisons plc Pharmaceutical Division, R &D Laboratories Loughborough, U.K.
Received 9 January 1991; revised 2 December 1991; .
Correspondence: Dr N. Friedel, Deutsches Herzzenlrum Berlin, Augustenburgcr Platz 1, D-1000 Berlin 65, Germany
Abstract
We studied the haemodynamic effects of dopexamine hydrochloride, a ß2-adrenergic agonist with dopaminergic (DA1) activity, in 20 patients with low cardiac output following surgery for coronary artery bypass grafting and/or valve replacement or repair. Following titration of four doses (1, 2, 4 and 6 µg. kg1. min1), the dose producing the optimal response was infused for up to 48 h (five patients). During the infusion, significant increases in cardiac index and stroke volume were accompanied by significant decreases in systemic vascular resistance. Heart rate increased significantly up to 6 h and thereafter returned to control levels. Mean blood pressure was reduced but did not fall below 60 mmHg. However, in five patients treated for 48 h mean blood pressure had returned to control levels. Unwanted effects (tachycardia and hypotension) were seen chiefly at higher doses, leading us to conclude that infusion rates of 4 µg . kg1. min1 or less will be useful in the treatment of low cardiac output following cardiac surgery.
Key Words: Dopexamine hydrochloride vasodilator low cardiac output syndrome cardiac surgery
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