RESUMEN
Background: Electrocardiography is the only practical method of recording the electrical behavior of the heart. It is often an independent marker of myocardial disease and occasionally the only indication of the pathologic process. Therefore the present study has been undertaken to find out the degree of normal variations in healthy individuals in different age groups. Methods: This study was conducted after the institutional ethical clearance and informed written consent from all the subjects belongs to age group of 18 to 40 years of either sex. All the ECG was taken in resting and supine position using BPL CARDIART 308 machine. The body weight, the QRS duration, QRS axis, P wave duration, P wave voltage, P wave axis in the frontal plane, QTc interval, T wave voltage and QRS-T angle was calculated. The values are expressed as mean and the percentile was calculated in each parameters. Results: The weight ranges from 56.37 ± 6.53 kg. QRS duration ranged from 0.04 to 0.12 seconds mean of 0.064 seconds. QRS voltage in V6 varied from 0.30 to 2.1 mv with a mean of 1.14 mv. The QTc interval was 0.31 to 0.47 seconds mean was 0.39 seconds. QRS-T angle varied from 0° to 70° with a mean of 30.9°. Conclusion: The study provides the frequency distribution and other statistical data when applied to all components of ECG which are commonly assessed during investigations of healthy young individuals. Having knowledge of these normal variants will be helpful in arriving at correct diagnosis.
RESUMEN
BACKGROUND: The elderly is known to have physiologic electrocardiographic changes with aging. But in Korea, such study is rare. METHODS: We investigated the residents in a community about past history of disease and current medications. Also we checked electrocardiography for those who were thought to be healthy. RESULTS: The elderly( > OR =60 year old) were 66 persons, and the young adults(<40 year old) were 8 persons. Mean QRS axis in the elderly was 37.7", and it was significantly deviated to the left compared with that(63.8" ) in the young adults(P<0.05). Mean T amplitudude of V6 in the elderly was 3.47mm, and it was to some degree shorter than that(4.81mm) in the young adults(P=0.063). But pulse rate, PR interval, QRS duration, amplitudude of Rl, R6, S1 were not different between the elderly and the young adults. CONCLUSIONS: Mean QRS axis in the elderly was significantly deviated to the left compared with in the young adults. And the mean T amplitude of V6 in the elderly was to some degree shorter than in the young adults.