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The effects of cardioversion and defibrillation on left ventricular systolic function
A J Fuenmayor1, E Vidal, A M Fuenmayor
1Centro de Investigaciones Cardiovasculares, Dr. Abdel M. Fuenmayor P. Universidad de Los Andes, Mérida, Venezuela.
Japanese Circulation Journal
|August 1, 1992
Summary
Cardioversion and defibrillation temporarily reduce left ventricular systolic function, measured by ejection fraction. This transient cardiac contractility impairment resolves within 12 hours and does not cause heart failure symptoms.
Area of Science:
- Cardiology
- Cardiac Electrophysiology
Background:
- Cardioversion and defibrillation are critical procedures for managing cardiac arrhythmias.
- Understanding the immediate impact of these interventions on left ventricular function is essential for patient management.
Purpose of the Study:
- To assess the effects of cardioversion and defibrillation on left ventricular systolic function.
- To determine the duration and characteristics of post-procedure cardiac contractility changes.
Main Methods:
- Prospective study of 18 adult patients undergoing cardioversion or defibrillation.
- Echocardiography (M-mode) and clinical evaluations performed pre-procedure, immediately after, and at 6 and 12 hours post-procedure.
- Analysis of left ventricular systolic indices, preload, afterload, and heart rate.
Main Results:
- A statistically significant decrease in left ventricular contractility (ejection fraction, circumferential fiber shortening) was observed 6 hours post-procedure (p = .04).
- This systolic dysfunction was transient, resolving within 12 hours, and independent of energy levels, arrhythmia type, or underlying cardiac conditions.
- A negative linear correlation existed between pre-countershock systolic indices and the degree of post-procedure systolic function decrease (p = .03).
Conclusions:
- Cardioversion and defibrillation induce a temporary reduction in cardiac contractility.
- The observed left ventricular systolic dysfunction is transient and does not lead to clinical heart failure, even in patients with pre-existing low ejection fraction.
- The degree of initial systolic impairment correlates with pre-procedure cardiac function.