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Sudden death during ambulatory Holter monitoring
Insights
Sudden cardiac death during Holter monitoring in patients with coronary artery disease often occurred during sinus rhythm. Ventricular arrhythmias, not specific warning signs, preceded the lethal event in most cases.
Area of Science:
- Cardiology
- Electrophysiology
- Sudden Cardiac Death Research
Background:
- Ambulatory Holter monitoring is crucial for diagnosing cardiac arrhythmias.
- Coronary artery disease is a major risk factor for sudden cardiac death.
- Antiarrhythmic drug therapy and prolonged QTc-interval can influence cardiac events.
Observation:
- Four cases of sudden cardiac death (SCD) were observed during ambulatory Holter monitoring.
- All patients had diagnosed coronary arterial disease.
- Sinus rhythm predominated, with severe bradycardia leading to asystole in one case.
Findings:
- Ventricular flutter degenerated into ventricular fibrillation in 3 patients, sometimes preceded by polymorphous ventricular tachycardia.
- Lethal events were triggered by ventricular premature beats (early or late cycle).
- No specific warning arrhythmia patterns preceded SCD; however, signs of ischemia or sympathetic overactivity were present in 3 patients.
Implications:
- Understanding the mechanisms of SCD during Holter monitoring is vital for risk stratification.
- The findings highlight the potential for lethal arrhythmias even in the presence of sinus rhythm or antiarrhythmic therapy.
- Further research into predicting and preventing SCD in coronary artery disease patients is warranted.
Abstract:
Four cases of sudden cardiac death during ambulatory Holter monitoring are described. All had coronary arterial disease. Two patients were on antiarrhythmic drug therapy and both had a prolonged QTc-interval on their resting electrocardiogram. The predominant rhythm was sinus rhythm in all. In one patient, severe bradycardia terminated in asystole. In the remaining 3 patients, ventricular flutter (which was initiated in 2 instances by a short run of polymorphous ventricular tachycardia) degenerated into ventricular fibrillation. The lethal event was triggered once by an early cycle ventricular premature beat and twice by late cycle ventricular premature beats. There was no specific pattern of warning arrhythmias preceding sudden cardiac death. Signs of ischemia/sympathetic overactivity preceding sudden cardiac death were found in 3 patients. Autopsy studies were performed in 2 patients and revealed acute ischemic myocardial damage.