Clinical use of calcium channel blockers as ventricular unloading agents

M. D. Guazzi, C. Cipolla, P. Sganzerla, P. G. Agostoni, F. Fabbiocchi, M. Pepi

Research output: Contribution to journalArticle

Abstract

Calcium channel blockers relax the arterial smooth vasculature and lower blood pressure when it is elevated because of excessive vasoconstriction. They may be regarded as ventricular unloading agents. Nifedipine (11 cases, Group 1) and verapamil (12 cases, Group 2) were tested in hypertensive patients with cardiac enlargement (LV diastolic diameter ≥60mm), ECG signs of LV strain, lung congestion and dyspnea at rest, in an acute (nifedipine 20 mg; verapamil 160 mg) and 1 month (nifedipine 20 mg q.i.d.; verapamil 160 mg t.i.d.) therapeutic evaluation. In the acute study nifedipine reduced systemic vascular resistance (SVR), mean arterial pressure (MAP), mean pulmonary wedge pressure (PWP) and LV diastolic diameter (DD) and improved cardiac index (CI) and Vcf. In Group 2 verapamil reduced SVR and MAP, improved CI and was not effective on PWP, LV DD and Vcf. Verapamil was discontinued in 2 patients who developed severe dyspnea at rest after 3-4 days of continued oral treatment. At the end of the trial Vcf, PWP and LV DD were unchanged in the remaining subjects in Group 2 despite persistent pressure reduction. In Group 1 all of the patients had relief of dyspnea and lung congestion, reduction of heart size, persistent decrease of MAP and PWP, and improvement in Vcf. The only side effect was ankle edema in 4 cases. A less potent vasodilating action of verapamil and a predominant depression in cardiac contractility may account for the different results with the two drugs, in spite of a shared antihypertensive effect. These findings prove that functional changes in the failing hypertensive heart may differ after nifedipine compared to verapamil as a result of interaction and relative preponderance of influences on afterload and contractility.

Original languageEnglish
Pages (from-to)181-187
Number of pages7
JournalEuropean Heart Journal
Volume4
Issue numberSuppl. A
Publication statusPublished - 1983

    Fingerprint

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

Cite this