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Verapamil effects on left ventricular performance in patients with congestive heart failure studied with
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Verapamil
Area of Science:
- Cardiology
- Pharmacology
Background:
- Verapamil is a calcium channel blocker used for cardiovascular conditions.
- Postoperative changes can affect drug distribution and excretion.
Purpose of the Study:
- To investigate the cardiac effects of a single verapamil dose.
- To compare these effects before and after surgery.
Main Methods:
- Digitalized M-mode echocardiograms were used.
- Pharmacological examinations were conducted on 6 patients.
- Measurements were taken pre- and postoperatively.
Main Results:
- The cardiodepressive effect of verapamil on left ventricular contraction was more pronounced and prolonged postoperatively.
- Initial improvement in ventricular contractility was observed, likely due to reduced peripheral resistance.
- Maximal cardiodepression occurred at serum concentrations of 35-40 ng/ml and diminished by 20 ng/ml.
Conclusions:
- Postoperative physiological changes significantly alter verapamil's cardiac impact.
- Verapamil's cardiodepressive effects are dose-dependent and influenced by patient's perioperative status.
Abstract:
Cardiac effects of a single dose of verapamil was studied with digitalization of M-mode echocardiograms in 6 patients before and after surgery, along with pharmacological examinations. Corresponding to the different distribution volume and excretion pre- and postoperatively, the cardiodepressive effect on the contraction of the left ventricle was more pronounced and lasted longer postoperatively. Probably due to initial reduction of peripheral resistance, there was an initial improvement of ventricular contractility indices. Obviously depending on serum concentration, maximal cardiodepression occurred at 35-40 ng/ml, and no effect could longer be found as the values reached 20 ng/ml, pre- as well as postoperatively.