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Changes in haemodynamics and left ventricular function during intravenous nifedipine infusion with and without
1University Clinic, Department of Cardiology, Tübingen, Federal Republic of Germany.
Insights
Combined nifedipine and propranolol treatment effectively reduces myocardial oxygen demand in coronary artery disease patients. This combination therapy maintains left ventricular function without adverse effects, unlike single nifedipine treatment.
Area of Science:
- Cardiology
- Pharmacology
Background:
- Coronary artery disease (CAD) poses significant cardiovascular risks.
- Managing myocardial oxygen demand is crucial for CAD patients.
- Nifedipine and propranolol are commonly used cardiovascular drugs.
Purpose of the Study:
- To investigate the hemodynamic effects of combined nifedipine and propranolol therapy.
- To compare the combined therapy against single nifedipine or placebo in CAD patients.
Main Methods:
- Ten patients with coronary artery disease were enrolled.
- Hemodynamic parameters were measured during intravenous nifedipine infusion.
- The effects of adding propranolol were assessed.
Main Results:
- Nifedipine reduced left ventricular afterload and volumes, increasing heart rate and ejection fraction (EF).
- Propranolol addition decreased heart rate and dp/dtmax, lowering myocardial oxygen demand.
- The combination therapy sustained afterload reduction without compromising LV function or EF.
Conclusions:
- Combined nifedipine and propranolol therapy reduces myocardial oxygen demand.
- Nifedipine's vasodilatory effects mitigate propranolol's negative impact on LV function.
- This combination allows for reduced oxygen demand without worsening LV function in CAD patients.
Abstract:
The haemodynamic effects of a combined intravenous treatment of nifedipine and propranolol in ten patients with coronary artery disease compared to a single treatment with nifedipine or placebo were investigated. Nifedipine infusion resulted in a reduction of left ventricular (LV) afterload and LV volumes with an increase in heart rate and EF and no change of the double product, coronary sinus flow, LV diastolic parameters and dp/dtmax. Addition of propranolol lowers myocardial oxygen demand by reducing heart rate and dp/dtmax together with a sustained afterload reduction with no change in LV volumes and EF. The vasodilatatory action of nifedipine pretreatment balanced the negative effects of acute beta-receptor blockade on LV function and allows the reduction of myocardial oxygen demand without a deterioration of LV function.