An optimized lead system for long-term esophageal electrocardiography

Area of Science:

• Biomedical Engineering
• Cardiology
• Medical Devices

Background:

• Long-term electrocardiography (ECG) requires high atrial and ventricular signal quality for comprehensive analysis.
• Surface ECG leads have limitations in atrial signal sensitivity, hindering the detection of supraventricular arrhythmias.
• Esophageal ECG offers potential to overcome surface lead limitations but necessitates specialized lead and recorder designs.

Purpose of the Study:

• To analyze multi-lead esophageal ECGs for signal quality.
• To describe ECG waves based on insertion level, interelectrode distance, electrode shape, and amplifier input range.
• To propose an optimized esophageal lead system for improved long-term ECG monitoring.

Main Methods:

• Analysis of clinical data from multi-lead esophageal ECG recordings.
• Evaluation of signal quality concerning ECG wave characteristics.
• Comparison of esophageal lead performance against standard surface lead II.
• Design and proposal of a specific esophageal lead configuration and recorder input range.

Main Results:

• Esophageal leads with short (15 mm) atrial and long (80 mm) ventricular interelectrode distances yielded non-inferior ventricular and superior atrial signal strength.
• The atrial esophageal lead demonstrated a high atrial signal slope.
• An increased recorder input range (±20 mV) minimized signal loss from electrode motion.

Conclusions:

• The proposed esophageal lead system enhances atrial signal detection and quality for long-term ECG.
• This system can standardize esophageal ECG registrations and support advanced ECG classification systems.
• Independent detection of atrial and ventricular electrical activity is facilitated by the proposed esophageal lead design.