Noninvasive His Bundle electrogram: value of three vector lead recordings

Area of Science:

• Cardiology
• Electrophysiology
• Medical Instrumentation

Background:

• The His bundle potential is a critical electrophysiological marker.
• Accurate measurement of the His bundle potential from the body surface can be challenging.
• Existing single-lead electrocardiographic recordings may not consistently capture this potential.

Purpose of the Study:

• To evaluate if signal averaging of three simultaneous electrocardiographic leads (X, Y, Z) improves His bundle potential measurement reliability.
• To compare the efficacy of a three-lead system against single leads for His bundle potential detection.

Main Methods:

• Conducted studies on 45 patients.
• Simultaneously recorded electrocardiographic potentials from horizontal (X), frontal (Y), and sagittal (Z) axes.
• Amplified potentials (250,000x), filtered (80-200 Hz), and performed signal averaging of 1,000 beats.

Main Results:

• The His bundle potential was clearly defined in 25 of 45 patients using single leads (X: 68%, Y: 77%, Z: 44%).
• No single lead provided satisfactory recordings in all patients.
• The three-lead system significantly increased the number of patients with definable His bundle potentials compared to the best single lead.

Conclusions:

• A simultaneous three-lead electrocardiographic system enhances the reliability of His bundle potential measurements.
• This multi-lead approach aids in identifying the optimal vectorial lead and validating findings.
• The three-lead system is superior to single leads for obtaining reliable His bundle electrograms.