[Sudden cardiac death in long-term electrocardiography]

Area of Science:

• Cardiology
• Electrophysiology
• Sudden Cardiac Death

Context:

• Analysis of long-term ECG recordings from 11 patients who died suddenly.
• Patients had pre-existing cardiac conditions including coronary heart disease, cardiomyopathy, and valve defects.
• Most patients exhibited signs of cardiac insufficiency and a history of syncope.

Purpose:

• To analyze long-term ECG recordings in patients experiencing sudden cardiac death.
• To investigate the role of arrhythmias, particularly ventricular tachycardia and fibrillation, as causes of sudden death.
• To assess the detectability of premonitory warning arrhythmias and specific trigger mechanisms like R-on-T phenomenon.

Summary:

• Sudden death in the study cohort (n=11) was predominantly due to tachyarrhythmias (91%), mainly ventricular tachycardia degenerating into ventricular fibrillation.
• Bradyarrhythmia caused sudden death in one patient (9%).
• Premonitory arrhythmias were inconsistently detected; only single ventricular extrasystoles increased significantly in the hour preceding death.

Impact:

• Findings suggest tachyarrhythmias are the primary mechanism in sudden cardiac death, challenging consistent prediction via pre-warning arrhythmias.
• The R-on-T phenomenon was identified as a trigger in 5 cases, highlighting its significance.
• This research contributes to understanding the electrophysiological events leading to sudden cardiac death, informing future preventative strategies.