The reliability of intermittent ECG sampling in arrhythmia detection

Area of Science:

• Cardiology
• Medical Devices
• Clinical Trials

Background:

• Intermittent electrocardiogram (ECG) sampling is widely used for arrhythmia detection.
• Controlled studies evaluating the efficiency of intermittent ECG sampling are lacking.

Purpose of the Study:

• To assess the efficiency of intermittent ECG sampling for detecting ventricular tachyarrhythmias.
• To compare detection rates based on sample duration and frequency.
• To evaluate the suitability of intermittent ECG sampling for antiarrhythmic drug trials.

Main Methods:

• Continuous 3-hour ECGs were recorded in 52 patients with ventricular tachyarrhythmias.
• Minute-to-minute ECG interpretation established true arrhythmia content.
• Intermittent samples (2-min, 5-min every 15-min; 2-min every 30-min) were simulated.
• Simulated sample findings were compared to true arrhythmia content.

Main Results:

• Detection rates varied with sampling time and arrhythmia occurrence.
• A 5-minute sample detected ~80% of ventricular tachyarrhythmia intervals; 1-minute samples detected ~50%.
• Infrequent arrhythmias (e.g., R on T, ventricular tachycardia) were poorly detected, even with extensive sampling.

Conclusions:

• Intermittent ECG sampling has a low detection rate for infrequent arrhythmias and short samples.
• The method risks under- or overestimating arrhythmia occurrence due to periodic distributions.
• Intermittent ECG sampling is unsuitable for evaluating antiarrhythmic drugs.