Experience of computer-assisted ECG recording in 242 exercise tests

Area of Science:

• Cardiology
• Biomedical Engineering
• Medical Technology

Background:

• Computer-assisted exercise tests are crucial for diagnosing cardiac conditions.
• Electrocardiogram (ECG) analysis is fundamental in exercise testing.
• Automated ECG processing aims to improve accuracy and efficiency.

Purpose of the Study:

• To evaluate the performance of a computer-assisted system for averaging ECG data during exercise tests.
• To assess the impact of ECG averaging on the fidelity of various ECG waveform components.
• To determine the suitability of ECG averaging for different cardiac rhythms and conditions.

Main Methods:

• Studied 242 computer-assisted exercise tests.
• Employed simultaneous averaging of 6- or 12-lead ECG.
• Tracked workload, time, and labeled ECG records.
• Analyzed the inclusion of arrhythmias and variations in QRS complex amplitude and width.

Main Results:

• Averaging included over 80% of all beats, with minimal inclusion (<1%) of atrial and ventricular extrasystoles.
• Peak-to-nadir QRS amplitude reduction ranged from 3-4% (400/s sampling) to 8-9% (200/s sampling).
• Q waves with low beat-to-beat variation were preserved; other QRS details sometimes decreased in width or amplitude.
• The averaging program handled most arrhythmias adequately but is not recommended for pacemaker ECGs or cases with very frequent ventricular extrasystoles.

Conclusions:

• Computer-assisted ECG averaging is generally effective for exercise tests, preserving key waveform features.
• The technique requires caution with specific arrhythmias, particularly frequent ventricular extrasystoles and pacemaker-dependent rhythms.
• Further refinement may be needed to optimize QRS detail preservation across all conditions.