Ethnic differences in electrocardiographic intervals and axes.

Area of Science:

• Cardiology
• Clinical Electrophysiology
• Human Physiology

Background:

• Electrocardiogram (ECG) interpretation can be influenced by various factors, including ethnicity.
• Previous research on ethnic variations in ECG patterns has yielded debated results.
• Understanding potential ethnic differences is crucial for accurate cardiac health assessment.

Purpose of the Study:

• To investigate ethnic variations in standard electrocardiogram (ECG) measurements.
• To determine if current ECG reference standards are universally applicable across different ethnic groups.
• To analyze interval and axes measurements in a multi-ethnic cohort with similar living conditions.

Main Methods:

• Retrospective analysis of 1,000 medical files from a multi-ethnic community.
• Inclusion of healthy adults (15-60 years) with uniform socioeconomic and environmental conditions.
• Computerized analysis of standard 12-lead ECGs for interval and axes measurements in 597 individuals.

Main Results:

• No statistically significant differences in PR interval, QRS duration, QT interval, P wave axis, QRS axis, or T wave axis were observed among men across ethnic groups.
• Minor statistically significant differences in QRS duration and P wave and QRS wave axes were noted in women of certain ethnic groups (Jordanians, Filipinos, Saudis, Indians, Caucasians).
• Despite statistical significance, the magnitude of observed differences in women was not clinically significant, suggesting universal applicability of current ECG standards.

Conclusions:

• Current reference standards for electrocardiogram (ECG) intervals and axes are appropriate for use across the studied ethnic groups.
• Ethnic variations in ECG parameters, particularly in women, were not clinically significant.
• This study supports the use of a single set of ECG reference values for diverse populations.