Further Study on Exercise Vectorcardiogram with Franks Lead : Spatial_??_ST, T Changes Produced by Exercise in Health and Disease

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Spatial changes of ST and T induced by exercise were studied in 15 control subjects, 19 patients with hypertension, 15 patients with angina pectoris and 10 patients with myocardial infarction. ST vector, the maximal T vector, the half maximal T vector (hm1 and hm2) and the angular range in horizontal plane were determined before, during and after exercise, using Franks lead system. The vectorial difference between 2 vectors before exercise and at the point of the maximal ST change during or after exercise was obtained for ST vector, the maximal T vector, hm1 and hm2 (ST, T, hm1 and hm2 exercise vector, respectively).(1) The mean values and standard deviations of the spatial magnitude of ST exercise vector were 0.6±0.4mm. in the control group, 0.6±0.5mm. in the hypertensive group, 1.5±0.7mm. in the group of angina pectoris and 1.8±0.6mm. in the group of myocardial infarction.(2) ST exercise vector was directed to the right and posteriorly in the control and the hypertensive group, mainly to the right and posteriorly in the group of angina pectoris, to the right and anteriorly, to the anterior or to the left and anteriorly in the anterior infarction group, and to the right and posteriorly or to the posterior in the inferior infarction group.(3) T exercise vector was directed to the right and posteriorly in the control group, the group of angina pectoris without hypertension and the inferior infarction group, and to the left and anteriorly in the hypertensive group, the group of angina pectoris with hypertension and the anterior infarction group.(4) Both hm1 and hm2 exercise vectors were directed to the right and posteriorly in the control group, the group of angina pectoris without hypertension and the inferior infarction group, and to the left and anteriorly in the hypertensive group. In the group of angina pectoris with hypertension, hm1 exercise vector was directed to the right and posteriorly and hm2 exercise vector to the left and anteriorly. In the group of the anterior infarction group, hm1 exercise vector was directed to the right and anteriorly and hm2 exercise vector to the left and anteriorly.(5) The mean values and standard deviations of the difference of the angular range before exercise and at the point of the maximal ST change (|φ2-φ1|) were 9.2±7.6 degrees in the control group, 11.0±7.9 degrees in the hypertensive group, 42.5±28.4 degrees in the group of angina pectoris and 50.8±29.4 degrees in the group of myocardial infarction.(6) There was a linear relationship between the magnitude of T exercise vector and φ2-φ1 for the control group, but not for other groups.(7) ST exercise vector of 1.0mm. and |φ2-φ1| of 20.0 degrees would be appropriate as criteria of exercise vectorcardiogram for the diagnosis of ischemic heart disease.
International Heart Journal刊行会の論文

Further Study on Exercise Vectorcardiogram with Franks Lead : Spatial_??_ST, T Changes Produced by Exercise in Health and Disease

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