A vectorcardiographic study of right bundle branch block with the frank lead system

Clinical correlation in ventricular hypertrophy and chronic pulmonary disease
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      A series of 77 patients with electrocardiographically and vector car diographically observed advanced right bundle branch block was studied with reference to the correlation between the electrocardiogram and vectorcardiogram and the presence or absence of associated heart disease or chronic pulmonary emphysema. Particular emphasis was placed upon the horizontal QRS loop patterns observed in the vectorcardiograms of patients with roentgenographic evidence of coexisting right, left and biventricular enlargement or pulmonary emphysema. Vectorcardiograms showing right bundle branch block with coexisting myocardial infarction were excluded from the study series.
      Three horizontal QRS loop patterns have been described, along with their clinical correlations. In contrast, the frontal QRS loops in these vectorcardiograms were not found to be helpful in the detection of coexisting ventricular hypertrophy.
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