Clinical studies of myocardial integrated backscatter in old myocardial infarction patients during dobutamine stress
- VernacularTitle:多巴酚丁胺负荷超声心动图与背向散射积分对陈旧性心肌梗死患者心肌存活性的研究
- Author:
Ruiqiang GUO
;
Jun ZHANG
;
Lan LIU
;
Al ET
- Publication Type:Journal Article
- Keywords:
Echocardiography,stress;
Integrated backscatter;
Myocardial infarction;
Viable myocardium
- From:Chinese Journal of Ultrasonography
1993;0(04):-
- CountryChina
- Language:Chinese
-
Abstract:
ObjectiveTo discuss the myocardial integrated backscatter (IB) characterization in old myocardial infarction (OMI) patients during the low dose dobutamine stress echocardiography (DSE). Methods Twenty eight OMI patients underwent 4 stages low dose DSE (0, 5, 10 and 20 ?g?kg -1 ?min -1 dobutamine infusion).The cardiac variation of IB (CVIB) and calibrated CVIB (CVIB%) were measured according to different segments (anterior septum, anterior wall, inferior wall and post wall of left ventricle) in different stages.ResultsIn the viable segments (Group C), CVIB and CVIB% increased from low level in early stage (5～10 ?g?kg -1 ?min -1 ) then maintaining in high level to the endpoint (20 ?g?kg -1 ?min -1 ), while maintained high level in control segments (Group A). Both CVIB and CVIB% were lower in non viable segments(Group D) than in Group A without changing during all stages. ConclusionsThe indexes of IB under dobutamine infusion were valuable for the quantitative evaluating the contractility of myocardium in OMI patients, especially for the viable myocardium.
