Related Experiment Videos
Electrocardiographic changes after cardioversion of ventricular arrhythmias
Circulation
|January 1, 1986
Summary
Cardioversion effectively treats ventricular arrhythmias, but early bradycardia after the procedure is linked to inferior myocardial infarction and requires multiple shocks. Further research into post-cardioversion rhythm changes is warranted.
Area of Science:
- Cardiology
- Electrophysiology
Background:
- Ventricular arrhythmias pose a significant risk.
- Cardioversion is a primary treatment for hemodynamically unstable ventricular arrhythmias.
Purpose of the Study:
- To assess electrocardiographic (ECG) changes, specifically rhythm and QRS-T alterations, following cardioversion of induced ventricular arrhythmias.
- To identify factors associated with adverse rhythm events post-cardioversion.
Main Methods:
- Continuous 3-lead and serial 12-lead ECG monitoring for 15 minutes post-cardioversion in 56 patients undergoing 77 cardioversions.
- External cardioversion (n=50) and internal cardioverter-defibrillator (n=9) were used.
- Analysis of arrhythmia termination success rates, occurrence of bradycardia and supraventricular tachycardia, and association with clinical factors.
Main Results:
- External cardioversion with 200 Wsec effectively terminated ventricular tachycardia (41/44) and ventricular fibrillation (6/13).
- Early bradycardia (≥1200 msec) occurred in 16 patients, associated with multiple cardioversions (p<0.05) and inferior myocardial infarction (p<0.05).
- Supraventricular tachycardia and non-sustained ventricular tachycardia were also observed post-cardioversion.
Conclusions:
- Cardioversion is effective in terminating ventricular arrhythmias.
- Early bradycardia post-cardioversion is a significant finding, particularly in patients with inferior myocardial infarction, and may predict the need for multiple interventions.
- Monitoring for rhythm disturbances after cardioversion is crucial.