心肌炎心肌病患者的早搏后强化作用临床研究

CLINICAL STUDY OF POSTEXTRASYSTO LIC P0TENTIATION IN THE PATIENTS WITH CARDIOMYOPATHIES AND MYOCARDITIS

By using extrasystole induced by transesophageal pacing combined with the differential impedance cardiogram, the indices of postextrasystolic potentiation degree ( RPESP ) RCdz/dt, RHI, Q-Z, PEP, LVET and PEP/LVET were observed in the normal persons and the pateints with cardiomyopathies and myocarditis. The results show that PRESP is in direct proportion to the postextrasystolic interval (PI) and in inverse proportion to the couple interval ( CI ) at the same static interval ( SI) . RPESP of the cardiomyopathies group is remarkedly higher than that of the myocarditis and of the normal subjects at the same SI, CI and PI. RCdz/dt and PEP/LVET have a good correlation with the left ventricular end djastolic diameter (r = 0.94, 0.96 respectively, P<0.01) and a high positive rate (87% and 90%, respectively) in the patients with cardiomyopathies. The false positive rates of RCdz /dt and PEP/LVET are low (10% and 0, respectively in the normal subjects) . Therefore the method is a safe, simple, sensitive, reliable and new way for the assessment of the myocardial disease.