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[The cardioprotective action of captopril during atrial electrostimulation]
Insights
Captopril may directly benefit the heart in angina patients by improving coronary flow, independent of blood pressure changes. This study shows enhanced exercise tolerance and reduced ECG changes after captopril administration.
Area of Science:
- Cardiology
- Pharmacology
Context:
- The renin-angiotensin-aldosterone (R-A-A) system is present in cardiac tissue.
- Angiotensin-converting enzyme (ACE) inhibitors are known for peripheral vascular effects.
Purpose:
- To evaluate the direct cardiac effects of captopril in patients with angina pectoris.
- To assess captopril's efficiency in improving coronary reserves using atrial pacing.
Summary:
- 18 patients with typical angina underwent atrial pacing before and after intravenous captopril.
- Fifteen patients showed improved exercise tolerance, systolic dynamics, ejection fraction, and anginal threshold.
- Ischemic ECG alterations were less severe and resolved faster post-pacing after captopril administration, with no significant blood pressure changes.
Impact:
- Findings suggest a direct cardioprotective action of captopril on the intrinsic cardiac R-A-A system.
- Captopril may improve coronary flow and cardiac function in normotensive angina patients.
- This research supports ACE inhibitors as a potential therapeutic strategy for direct cardiac benefits in angina.
Abstract:
The presence of R-A-A system components in all organs (heart included) has suggested a possible cardio-protective effect of the angiotensin conversion enzyme inhibitors as a result of coronary flow improvement. This effect would act irrespective of the well-known peripheral vascular effects: vasodilation, blood pressure decrease, pre- and postload reduction. By using the atrial pacing in the quantitative assessment of the anginal threshold and of the associated ECG alterations before and after the i.v. administration of 25 mg of captopril we could immediately evaluate the coronary reserves by estimating the efficiency of captopril in the patients with angina pectoris. The atrial pacing has been performed, by using the method suggested by Sowton, in 18 patients with typical angina. The increase of heart tolerance at exercise, the systolic dynamics improvement and the ejection fraction increase as well as the raising of the anginal threshold have been noticed in 15 of the patients. The blood pressure has evidenced no significant changes. After the administration of captopril, the ischemic ECG alterations have been less marked and their postpacing remains shorter. Our findings plead for a direct action of captopril on cardiac intrinsic R-A-A system in the normotensive patients suffering from angina pectoris.