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| Abstract |
Age trends and sex differencnces in the QRS amplitude of conventional electrocardiogram were studied in normal adolescent. The subjects consist of 2056 students (mean of age 18.6 years old) and 446 pu...pils (mean of age 15.5 years old) . The most popular findings in students were sinus arrhythmia (14.5%) sinus bradycardia (7.6%), left ventricular hypertrophy (7.5%) and left axis deviation (5.5%), while in pupils, those were left ventricular hypertrophy (21.4%), right axis deviation (7.8%), sinus arrhythmia (5.8%), sinus tachycardia (4.3%). Left ventricular hypertrophy (LVH) was diagnosed when SV1+RV 5 or 6 was greater than 50mm. The incidence of LVH in male were apparently higher than that in female, in both students and pupils; male 8.6% to female 0.4% (p<0.001) in students and male 21.4% to female 0.5% (p< 0.001) in pupils, respectively. All of those showing LVH in ECG were confirmed to have no pathological left ventricular hypertrophy by means of chest X-ray, echocardiogram and phonocardiogram. No significant differences between LVH group and normal controls of each students and pupils were observed in body height, body weight and body circumference. In LVH group of students, the incidence of possible borderline hypertension were higher than in normal controls. These results suggest that the usual criterion of LVH in ECG are not suitable for adolescent, and that the high voltages in left ventricle may result from the increase of electrical force in left ventricle, since age trends and sex differences in SVI + RV 5 or 6 can not be sufficiently explained by body construction such as body weight and body circumference.show more
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