ECG Features that suggest a potentially life-threatening arrhythmia as the cause for syncope

Area of Science:

• Cardiology
• Electrophysiology
• Medical Diagnostics

Background:

• Syncope (fainting) is a significant risk factor for sudden cardiac death (SCD), particularly in patients with structural or inherited heart diseases.
• The electrocardiogram (ECG) is a vital tool for identifying cardiac abnormalities associated with syncope.

Purpose of the Study:

• To review the significance of ECG findings in patients experiencing syncope.
• To highlight specific ECG patterns indicative of structural, conduction system, and primary electrical heart diseases linked to syncope and SCD risk.

Main Methods:

• Review of existing literature and established diagnostic criteria for various cardiac conditions presenting with syncope.
• Analysis of characteristic ECG findings associated with hypertrophic cardiomyopathy (HCM), arrhythmogenic right ventricular dysplasia (ARVD/C), Wolff-Parkinson-White syndrome, long QT syndrome, and Brugada syndrome.

Main Results:

• ECG can reveal signs of myocardial infarction, cardiomyopathy (e.g., HCM with specific voltage, repolarization, and QRS abnormalities), conduction blocks, and primary electrical diseases.
• Specific findings like epsilon waves in ARVD/C and coved ST-segments in Brugada syndrome (Type I) are diagnostic.
• Early repolarization patterns on ECG may also be associated with elevated SCD risk, though clinical significance in syncope is under investigation.

Conclusions:

• Thorough ECG interpretation in syncope patients is essential for detecting potentially life-threatening cardiac conditions.
• Identifying specific ECG patterns aids in diagnosing conditions like HCM, ARVD/C, and Brugada syndrome, informing risk stratification and management strategies for SCD prevention.