Ethnic differences in electrocardiographic amplitude measurements

Area of Science:

• Cardiology
• Medical Science
• Human Physiology

Background:

• Ethnic variations in electrocardiogram (ECG) patterns are debated due to confounding factors.
• Socioeconomic, nutritional, environmental, and occupational factors may influence ECG readings.
• Previous studies lacked control for these confounding variables.

Purpose of the Study:

• To investigate ethnic differences in ECG patterns.
• To analyze wave amplitudes in a multi-ethnic population with similar living conditions.
• To determine if ethnic origin impacts ECG characteristics independent of environmental factors.

Main Methods:

• Reviewed 1000 medical files from a multi-ethnic community with uniform living conditions.
• Included only healthy adults aged 15-60 years.
• Measured standard 12-lead ECG wave amplitudes manually using Minnesota coding.

Main Results:

• Significant differences in Sokolow-Lyon voltage (SLV) among ethnic groups were observed in men, but not in women.
• Prevalence of early transition patterns varied significantly among ethnic groups in men.
• T wave amplitude showed significant ethnic and sex-based differences in specific ECG leads.

Conclusions:

• ECG wave amplitudes demonstrate ethnic variations even when confounding factors are minimized.
• Current criteria for left ventricular hypertrophy (e.g., SLV of 3.5 mV) may require ethnic adjustment.
• High R wave in lead V1 and T wave height exhibit ethnic and sex-specific patterns in healthy adults.