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Effects of rolipram, pimobendan and zaprinast on ischaemia-induced dysrhythmias and on ventricular cyclic nucleotide content in the anaesthetized rat

Published online by Cambridge University Press:  02 June 2005

M. D. Carceles ,
F. Aleixandre ,
T. Fuente ,
J. López-Vidal  and
M. L. Laorden
M. D. Carceles
Affiliation:
University School of Medicine, Department of Anaesthesiology, CSV Arrixaca Hospital, Murcia, Spain
F. Aleixandre
Affiliation:
University School of Medicine, Department of Anaesthesiology, CSV Arrixaca Hospital, Murcia, Spain
T. Fuente
Affiliation:
University School of Medicine, Department of Nuclear Medicine, CSV Arrixaca Hospital, Murcia, Spain
J. López-Vidal
Affiliation:
University School of Medicine, Department of Anaesthesiology, CSV Arrixaca Hospital, Murcia, Spain
M. L. Laorden
Affiliation:
University School of Medicine, Department of Pharmacology, CSV Arrixaca Hospital, Murcia, Spain
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Extract

Summary

Background and objective: This study was designed to compare the haemodynamic, electrophysiological and pharmacodynamic effects of three selective inhibitors of the different isoenzyme forms of phosphodiesterase (PDE) on ischaemia-induced dysrhythmias in the anaesthetized rat. The drugs used were pimobendan, a selective PDE III inhibitor, rolipram, a selective PDE IV inhibitor, and zaprinast, a selective PDE V inhibitor.

Methods: The coronary artery was occluded 15 min after commencing drug administration, and myocardial ischaemia was maintained for 30 min during which the heart rate and mean arterial pressure were recorded. cAMP and cGMP were determined by radioimmunoassay.

Results: Pretreatment with rolipram decreased the duration of ventricular tachycardia without any change in the incidences of dysrhythmias or the mortality rate. This drug did not modify ventricular content of adenosine 3′,5′-cyclic monophosphate (cAMP) or guanosine 3′,5′-cyclic monophosphate (cGMP). Pimobendan (1 mg kg−1 + 0.1 mg kg−1 min) decreased the duration of ventricular tachycardia. This dose of pimobendan and zaprinast (1 mg kg−1 + 0.1 mg kg−1 min−1) increased the incidence rate of ventricular fibrillation following coronary artery ligation and the mortality rate. Moreover, both drugs increased cGMP in the ventricle.

Conclusions: The results demonstrated that pimobendan and zaprinast increased the incidence of dysrhythmias and the mortality rate, which was accompanied by an increase in the ventricular content of cGMP. Rolipram decreased the duration of ventricular tachycardia without a change in the cyclic nucleotide content or in the mortality rate.

Keywords

ENZYME INHIBITORS, phosphodiesterase inhibitors, pimobendan, rolipram, zaprinastISCHAEMIA, myocardial ischaemiaNUCLEOTIDES, CYCLIC, cAMP, cGMPRAT
Type
Original Article
Information
European Journal of Anaesthesiology , Volume 20 , Issue 3 , March 2003 , pp. 205 - 211
Copyright
© 2003 European Society of Anaesthesiology

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