title: Basic study for computer analysis of the pediatric electrocardiogram: relation of the distance-corrected precordial electrocardiographic voltage with the echocardiographically determined left ventricular muscle volume.
abstract: The left ventricular muscle volume (LVMV) and the distance from the anterior chest wall to the middle of the left ventricle (D) were determined echocardiographically in 476 children as a part of the Shimane Heart Study. Correlation of the summed precordial voltage (SV1 + RV5) with LVMV was not good (r = 0.377 in males and -0.095 in females). The precordial voltage (SV1 + RV5), therefore, was corrected by the square of D to compensate the diminution of electrical potential by distance. Correlation between D2 (SV1 + RV5) and LVMV was good in males (r = 0.712) and relatively good in females (r = 0.469). Moreover, the values of D2 (SV1 + RV5) were different between both sexes at the age of 12--16 years. The thickness of subcutaneous fat may be one of the most important factors for these differences in D2 (SV1 + RV5) and correlation coefficient.
mesh_terms: D000293:Adolescent; D002306:Cardiac Volume; D002648:Child; D003201:Computers; D004452:Echocardiography; D004562:Electrocardiography; D006801:Humans; D008297:Male; D012737:Sex Factors