早搏后心阻抗微分图A波变化评定左心室舒张功能

ASSESSMENT OF LEFT VENTRICULAR DIASTOLIC FUNCTION BY THE POSTEXTRASYSTOLIC ATRIAL WAVE CHANGE OF THE DIFFERENTIAL IMPEDANCE CARDIOGRAM

Atrial wave change amplitudes (Adz/dt) at a variable postextrasystolic interval ( PESI) were observed in 21 patients with coronary heart disease (CHD) and 22 normal subjects using extrasystole induced by transesophageal pacing combined with differential impedance cardio-ra m. The results showed that the postextrasystolic compensatory interval was prolonged and the atrial wave change amplitudes gradually decreased, but the ratio of pre- and post-extrasystolic Adz/dt (RA) gradually increased in two groups. RA of the normal was obviously larger than that of the patients with CHD (P<0.01) at the same P ESI. The positive rates of Adz/dt max, A/C (ratio of A wave to C wave amplitude ) and RA in the CHD group were obviously higher than those in the normal group. The RA positive rate was the highest. It suggested that RA can sensitively reflect the left ventricular diastolic compliance and this method be a safe, simple, sensitive and atraumatic one clinically to assess the left ventricular diastolic function.