Doppler-Derived Mitral Deceleration Time

Abstract

Background —The relation between remodeling and left ventricular (LV) diastolic function has not yet been fully investigated. The aim of this study was to determine whether early assessment of Doppler-derived mitral deceleration time (DT), a measure of LV compliance and filling, may predict progressive LV dilation after acute myocardial infarction (AMI). Methods and Results —Fifty-one patients (aged 61±11 years; 6 women) with anterior AMI successfully treated with direct coronary angioplasty underwent 2-dimensional and Doppler echocardiographic examinations within 24 hours of admission, at days 3, 7, and 30 and 6 months after the index infarction. Mitral flow velocities were obtained from the apical 4-chamber view with pulsed Doppler. End-diastolic volume index (EDVI) and end-systolic volume index (ESVI) were calculated with the Simpson’s rule algorithm. Patients were divided according to the DT duration assessed at day 3 in 2 groups: group 1 (n=33) with DT >130 ms and group 2 (n=18) with DT ≤130 ms. Patency and restenosis rate at 6 months were similar between the 2 groups (94% group 1 vs 89% group 2; P =0.52; 27% group 1 vs 33% group 2; P =0.64, respectively). LV volume indexes were similar in both groups at baseline (EDVI: 71±3 group 1 vs 70±3 mL/m 2 group 2, P =0.42; ESVI: 43±3 group 1 vs 48±3 mL/m 2 group 2, P =0.13, respectively). From day 3 on, LV volume indexes progressively increased in group 2 and were significantly larger than those of group 1 at 6 months (LVEDVI 61±3 group 1 vs 104±6 mL/m 2 group 2, P =0.00001; LVESVI 31±3 group 1 vs 73±6 mL/m 2 group 2, P =0.00001, respectively). A significant inverse correlation was found between DT and changes in EDVI at 6 months ( r =−0.68; P <0.0000001). By stepwise multiple regression analysis among several clinical, demographic, angiographic, and echocardiographic variables, DT was the most powerful predictor of EDVI changes at 6 months ( P =0.02). Conclusions —These data suggest that early estimation (day 3) of Doppler-derived mitral DT provides a simple and accurate mean to predict late LV dilation after reperfused AMI.