RELATIONSHIP OF THE P LOOP MEASUREMENTS TO PULMONARY ARTERY WEDGE PRESSURE AND LEFT ATRIAL VOLUME IN PURE MITRAL STENOSIS

概要

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Frank vectorcardiographic P loops with satisfactory signal to noise ratio were obtained from 28 patients with pure mitral stenosis by using computer-averaging technique of eight successive beats. Twenty-three parameters of the P loop automatically measured were compared with the mean pulmonary artery wedge pressure (m^^- PAW) and the maximal left atrial volume (max. LAV) calculated from biplane angiocardiogram by the area-length method. There was a significant correlation between the m^^- PAW and four P loop measurements. The positive amplitude in lead Z (the posterior component) showed the highest correlation with the m^^- PAW (r = 0.54, p<0.01). In the multiple regression analysis, the predicted m^^-PAW using eight P loop measurements and the measured m^^- PAW showed a high significant correlation (r = 0.86, p<0.01). There were significant correlations between the max. LAV and fourteen P loop measurements. The magnitude of spatial maximal P-vector showed the highest correlation with the max. LAV (r = 0.86, P<0.01). In the multiple regression analysis, the predicted max. LAV using four P loop measurements out of 23 showed the best correlation with the measured max. LAV (r = 0.94, P<0.01).
社団法人日本循環器学会の論文
1976-10-20