A study of QTC interval in normal healthy individuals

Objective: Present study is undertaken to understand genesis of variability in QTC interval in healthy subjects as per age, sex and weight parameters and planning preventive measures for any abnormal findings. Materials and methods: 315 healthy normotensive healthy subjects (male=179, female=136) in age group of 0 to 51 years and above were selected for the study. After recording anthropometric parameters ECG was recorded in supine position in standard limb leads with paper speed of 25 mm/sec. All ECG records were analysed for rate, rhythm, waves (P, Q, R, S, T) and intervals (PR, QRS, ST, QT) in all leads. The QT interval was measured from the beginning of the QRS complex to the end of the T-wave in lead II, corrected QT (QTC) interval was calculated by using Bazett