An Analysis Of QRS Interval Of The Electrocardiogram In Asymptomatic Normal Nigerians
AbstractObjectives: This cross-sectional study of the 12-lead electrocardiogram (ECG) was undertaken to establish the normal QRS interval of the adult Nigerian from Jos; to find significant correlation coefficients for QRS interval and the various anthropometric measurements and also to establish prediction equations for the QRS interval of the electrocardiogram.
Methods: The QRS interval was measured in 109 young healthy adult Nigerians. Males numbered ninety-five and females numbered fourteen. They were aged between 19 years and 30 years.
Results: The mean values for QRS interval in the 12-lead ECG were: Sec ± S.D (Lead 1:0.06 ± 0.01; lead II: 0.07 ± 0.01; lead III 0.07 ± 0.01; lead aVR: 0.07 ± 0.01; lead aVL: 0.07 ± 0.01; lead aVF: 0.08 ± 0.02; lead V1: 0.10 ± 0.04; lead V2:0.10 ± 0.01; lead V3: 0.08 ± 0.01; lead V4:0.07 ± 0.02; lead ± V5: 0.07 ± 0.01; lead V6: 0.07 ± 0.02).
Significant inverse correlation was found between: (1) QRS interval and age in lead aVR. (2) QRS interval and weight in lead V3. (3) QRS interval and the systolic blood pressure in lead V1. (4) QRS interval and the diastolic blood pressure in leads aVR and V1. (5) QRS interval and the chest circumference in lead V3.
Conclusion : This study has demonstrated the normal range (0.06 ± 0.01 sec in lead 1 to 0.10 ± 0.01 sec in level V2) for the QRS interval in young adult normal Nigerians in Jos and thus provided a precise guide for the interpretation of QRS interval in this city.
Key words: QRS interval, Electrocardiogram, asymptomatic, Cross-sectional study.
Highland Medical Research Journal Vol.2(2) 2004: 37-41