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Non-invasive evaluation of the haemodynamic effects of amiodarone
Insights
Amiodarone treatment in patients led to improved cardiac function, primarily by reducing afterload. Hemodynamic changes were observed, but myocardial contractility was not significantly affected.
Area of Science:
- Cardiology
- Pharmacology
- Internal Medicine
Background:
- Amiodarone is an antiarrhythmic drug with known cardiovascular effects.
- Understanding its hemodynamic impact is crucial for patient management.
Purpose of the Study:
- To evaluate the hemodynamic effects of amiodarone treatment.
- To assess changes in cardiac function and contractility.
Main Methods:
- Hemodynamic assessment using echocardiography, apexcardiography, and systolic time intervals.
- Patients received amiodarone 600 mg daily for 1 week, then 300 mg daily for 2-4 months.
- Thyroid function was monitored throughout the study.
Main Results:
- Echocardiography showed a slight increase in shortening fraction; left ventricular dimensions remained stable.
- Systolic time intervals revealed significant decreases in preejection period index and preejection period/left ventricular ejection time.
- Hemodynamic changes were primarily attributed to decreased afterload, with minor contributions from preload and contractility.
Conclusions:
- Amiodarone treatment significantly alters hemodynamic parameters, mainly by reducing afterload.
- Observed changes in systolic time intervals suggest improved cardiac efficiency.
- Thyroid function changes did not correlate with the observed hemodynamic effects.
Abstract:
Sixteen patients were examined hemodynamically with echocardiography, calibrated apexcardiography, and systolic time intervals before treatment, after 1 week treatment with amiodarone 600 mg daily and after 2-4 months treatment with 300 mg daily. During the treatment thyroid function was controlled. The echocardiogram showed a small increase in shortening fraction, while left ventricular dimensions did not change significantly. The apexcardiogram revealed minor changes, which could not be interpreted as being due to changes in contractility. The systolic time intervals showed marked decreases in preejection period index and preejection period/left ventricular ejection time. These changes could not be correlated to changes in serum thyroxine, which was the only thyroid parameter to change significantly. The hemodynamic changes during amiodarone treatment were interpreted as mainly being due to a decrease in afterload while possible changes in preload and myocardial contractility were of minor importance.