RELATIONSHIP BETWEEN THE SPATIAL R PEAK TIME DETERMINED BY HIGH PAPER SPEED ORTHOGONAL ELECTROCARDIOGRAM AND THE SIZE OF THE LEFT VENTRICULAR CAVITY

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In thirty-three patients including 12 controls and 21"pure"eccentric LVH cases with"chamber enlargement with normal or slight thickening of the left ventricular free wall", the left ventricular end-diastolic volume and the length of the left ventricular major axis at end-diastole correlated to"the spatial R peak time"that is the time of the occurrence of the spatial maximal QRS vector, calculated by the scalar orthogonal leads of Frank using the paper speed of 100 mm/sec, of which correlation coefficients revealed highly close relationship (r=0.88 and 0.89, p<0.001, respectively). In the only patient with pure mitral regurgitation, the spatial R peak time shortened at the postoperative stage and was in parallel with the decrease in angiocardiographic left ventricular cavity size. These observations suggest that (1) the relatively exact cavity size of the left ventricle in"pure"eccentric LVH without combined RVH may be assessed by an exact estimation of the spatial R peak time using the orthogonal electrocardiogram with the paper speed of 100 mm/sec, and (2) this method may have merit in so far as variations in body build influence the QRS voltage measurements which are popularly utilized when diagnosing left ventricular hypertrophy.
社団法人日本循環器学会の論文
1976-04-20