Vectorcardiographic Evaluation of Myocardial Infarct Size : Departure Parameters are Superior to Conventional Spatial Parameters

概要

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To determine whether the departure parameters derived from a"departure loop"of a vectorcardiogram are more accurate than conventional spatial parameters in evaluating myocardial infarct size, 74 patients with first-onset myocardial infarction(MI)were studied. The correlation between the departure parameters(amplitudes in scalar leads of the departure loop)and the percent defect volume of thallium myocardial scintigrams(%DV)was compared with that of the spatial parameters(magnitude, azimuth, and elevation of the original QRS loop). In anteroseptal MI, the amplitude of a 20-msec vector in the z-axis and the azimuth of a 30-msec vector(H_<30>)were significantly correlated with %DV(r=0.783, p<0.001 and r=0.572, p<0.05). In anteroseptal MI with involvement of the lateral wall, the amplitude of a 30-msec vector in the x-axis and H30 showed significant correlation with %DV(r=0.802, p<0.001 and r=0.772, p<0.01). In inferior and inferoposterior MI, the amplitude of a 30-msec vector in the y-axis and the elevation of a 30-msec vector were significantly correlated with %DV(r=0.920, 0.891, p<0.001 and r=0.871, 0.678, p<0.01, respectively). In conclusion, the departure parameters are more accurate than the spatial parameters for evaluation of myocardial infarct size.
社団法人日本循環器学会の論文
1998-06-20