Value of predicting functional improvement of viable myocardium after percutaneous transluminal coronary angioplasty by dobutamine strain rate imaging
- VernacularTitle:多巴酚丁胺负荷下应变率成像预测冠状动脉成形术后存活心肌功能改善的价值
- Author:
Ruiqiang GUO
;
Wenli JIANG
;
Qing ZHOU
;
Jinling CHEN
;
Lidan HAO
- Publication Type:Journal Article
- Keywords:
Echocardiography,stress;
Myocardial infarction;
Myocardial stunning;
Angioplasty,transluminal,percutaneous coronary;
Strain rate imaging
- From:
Chinese Journal of Ultrasonography
2003;0(05):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate the value of predicting functional improvement of viable myocardium after percutaneous transluminal coronary angioplasty(PTCA) by strain rate imaging(SRI) combining with low-dose dobutamine stress echocardiography(LDDSE).Methods PTCA was performed in 20 patients with old myocardial infarction and 72 segments of resting dyskinetic wall motion at baseline were observed.Peak systolic strain rate(SSR) and systolic peak velocity(Vs) were measured in abnormal walls at baseline and SRI combined with LDDSE one day before PTCA.Increment of SSR and Vs was defined during stress echocardiography(?SSR% and ?V_S%).The follow-up analysis was performed 6 weeks after PTCA.Results The dyskinetic motion of 48/72 segments was improved according to the follow-up echocardiography 6 weeks after PTCA while that of 24/72 segments was not.Considering ?SSR%≥(2.02%),?V_S%≥(8.5%) in 5 ?g?kg~(-1)?min~(-1) stress and ?SSR%≥(24.7%),?V_S%≥(28.5%) in 10 ?g?kg~(-1)?min~(-1)stress as cut-offs for motion improvement of the left ventricular dyskinetic segments,the sensitivities were(93.8%),(89.6%) and(95.8%),(91.7%),respectively.At baseline SSRs of two groups were significantly different while Vs did not have significant difference.Conclusions Combined with LDDSE,SRI can more accuratly predict the motion improvement of viable myocardium than tissue velocity imaging can.
