Standard 12-lead electrocardiogram in healthy young adults in South-Western Nigeria.

OBJECTIVE:This study aimed to determine the mean values of electrocardiographic parameters, and to describe the pattern of electrocardiograms in young adults. METHODS AND RESULTS:353 healthy young adults were evaluated by medical history, physical examination, and standard 12-lead electrocardiogram. The mean heart rate, QRS duration, PR interval, QT interval, corrected QT interval (QTc),T wave axis, P wave duration and amplitude were: 74 +/- 9 beats per min, 0.09 +/- 0.01s, 0.15 +/- 0.02 s, 0.36 +/- 0.02 s, 0.40 +/- 0.02 s, 54 +/- 20 degrees, 49 +/- 14 degrees, 0.09 +/- 0.01 s, 1.28 +/- 0.41 mm, respectively. The dominant electrocardiographic peculiarity among the participants was early repolarization which was characterized by male preponderance. CONCLUSION:This study defined baseline values for electrocardiographic variables in healthy young adults. Early repolarization is a common ECG feature in young adults.