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Chiharu IBUKIYAMATo obtain an overall view of the QRSloop on vectorcardiograms (VCG)of hypertrophic cardiomyopathy (HCM),the coordinate axis was transformed using the resolver method. The morphological features and planarity of the loop were compared with hypertrophic patterns and hypertensive heart disease (HHD). The subjects in the present study included 30 normal individuals, 40 patients with HCMand 30 with HHD. The HHDgroup was selected from patients showing left ventricular hypertrophy on VCGsimilar to that of HCM patients. The HCMgroup showed significantly greater values than the HHDgroup in the thickness/length ratio, which represents the planarity of the spatial QRSloop. The above finding suggests that the HCMgroup had greater deformation in the QRS loop than the HHDgroup. This may provide a useful indicator for the differential diagnosis of the two diseases.