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Effects of felodipine on systemic and coronary haemodynamics in patients with angina pectoris
Insights
Felodipine, a dihydropyridine derivative, acts as a potent vasodilator, improving systemic and coronary blood flow in patients with coronary artery disease. Further research is needed to determine optimal dosing for ischemic heart disease treatment.
Area of Science:
- Cardiology
- Pharmacology
Background:
- Coronary artery disease (CAD) poses significant challenges in cardiovascular treatment.
- Dihydropyridine derivatives are explored for their vasodilatory properties.
Purpose of the Study:
- To investigate the systemic and coronary hemodynamic effects of felodipine in patients with CAD.
- To assess felodipine's impact during rest and pacing-induced angina.
Main Methods:
- Cardiac catheterization was performed on 10 CAD patients.
- Hemodynamic parameters were measured at rest and during pacing-induced angina.
- Systemic arterial pressure, heart rate, cardiac index, and coronary sinus flow (CSF) were analyzed.
Main Results:
- Felodipine significantly decreased systemic arterial pressure and increased heart rate and cardiac index at rest.
- Coronary sinus flow (CSF) increased by approximately 50%.
- During pacing, felodipine maintained hemodynamic improvements without significantly altering myocardial lactate extraction or ST segment depression.
Conclusions:
- Felodipine is a potent systemic and coronary vasodilator.
- It shows potential for treating hypertension, cardiac failure, and ischemic heart disease.
- Further studies are required to establish optimal therapeutic doses for ischemic heart disease.
Abstract:
In order to study the systemic and coronary haemodynamic effects of felodipine, a new dihydropyridine derivative, 10 patients with coronary artery disease were studied during cardiac catheterization. Measurements were performed at rest and during pacing-induced angina pectoris. At rest, the heart rate rose from 70 +/- 20 to 78 +/- 20 (P less than 0.05), the systemic arterial pressure decreased by about 20% (P less than 0.01) and the cardiac index rose from 2.9 +/- 1.2 to 4.0 +/- 1.0 (P less than 0.05). The coronary sinus flow (CSF) increased about 50% (P less than 0.01). During pacing to the same heart rate as in the control measurements, felodipine induced similar changes in systemic haemodynamic values as in the resting position. Myocardial lactate extraction and ST segment depression were not significantly altered. After felodipine, the pacing rate could be further increased in 7 patients as compared with the control value. Both systemic and coronary effects were then very similar compared with those during the lower pacing rate. In conclusion, felodipine is a very potent systemic and coronary vasodilator with potential value in the treatment of hypertension and cardiac failure. The drug may also be of value in the treatment of ischaemic heart disease, but further studies with titration of optimal doses are needed in that respect.
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