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Simple method of evaluating vectorcardiographic loops in children.

From the Frank vectorcardiograms of 0OI normal children between 3 and I4 years of age, percentile vector tables and charts have been constructedfor the horizontal, frontal, and left sagittal planes. The use of these charts allows a rapid analysis of unknown vectorcardiograms by demon-strating where normal limits are exceeded. As an initial test of the method, the vectorcardiograms of 20 patients with aortic stenosis and 20 patients with pulmonary stenosis were analysed in the horizontal plane. For the aortic stenosis patients, I9 of the 20 exceeded the 95th percentile limits in the posterior quadrants, and all 20 of the patients with pulmonary stenosis exceeded the 95th percentile limits in the right quadrants. Thus, it appears that the method described allows a rapid means of detecting abnormality of vectorcardiograms, and in an initial test appears to be quite sensitive. The use of normal percentile charts and tables should make feasible the routine analysis of vectorcardiograms in clinical practice.