A new method for recording a three-lead electrocardiogram using a two-channel Holter system.

Area of Science:

• Cardiology
• Medical Devices
• Diagnostic Technology

Background:

• Conventional two-channel Holter monitoring has limitations in detecting subtle cardiac events.
• There is a need for advanced ECG monitoring techniques to improve diagnostic accuracy for conditions like angina pectoris.

Purpose of the Study:

• To develop and evaluate a three-lead electrocardiogram (ECG) recording technique using a standard two-channel Holter recorder.
• To assess the utility of this new method in detecting variant angina and asymptomatic ischemic ST changes.

Main Methods:

• A novel technique was devised to record a three-lead ECG (CM5, CM2, and CMf leads) on a two-channel Holter recorder.
• The device switched between CM2 and CMf leads every 30 seconds on the second channel, while the first channel continuously recorded the CM5 lead.
• Fifty-eight patients with angina pectoris were studied using this device.

Main Results:

• The technique successfully recorded three-lead ECG data, enabling detailed analysis of ST changes.
• Two patients with variant angina pectoris showed distinct ST elevation/depression patterns across leads.
• 127 transient ischemic ST changes were observed in 41 patients during daily activities, with 72% occurring asymptomatically.

Conclusions:

• The developed three-lead Holter monitoring is valuable for detecting variant angina.
• This method improves the detection of asymptomatic ischemic ST changes compared to conventional two-lead Holter monitoring.
• The technique offers enhanced diagnostic capabilities without requiring additional channels or electrodes.