High versus Low Mechanical Index Imaging Diagnostic Ultrasound in Patients with Myocardial Infarction: A Therapeutic Application Study

13 August 2020: Clinical Research

Zongbao Niu ^1ABF , Xiaolan Lv ^1CDF , Jianhua Zhang ^2ABCF , Tianping Bao ^3DEF

DOI: 10.12659/MSM.923583

Med Sci Monit 2020; 26:e923583

Table 3 Echocardiographic evaluations.

Ultrasound diagnosis	Cohorts										Comparisons between cohorts
Ultrasound diagnosis	Low acoustic energy					High acoustic energy
Numbers of patients	199					251
Characteristics	BL	ML		EL		BL	ML		EL		ML	EL
Number of infarct vessels	235	235	*P-value	235	*P-value	300	300	*P-value	300	*P-value	P-value	P-value
Maximum% ST segment resolution	3.11±0.15	5.12±0.18		15.14±1.12		3.14±0.22	20.18±1.15		22.45±2.45
Wall motion score index	1.81±0.52	1.85±0.47	0.3821	1.79±0.41^**	0.644	1.78±0.49	1.68±0.42	0.008	1.61±0.39	0.035
% Ejection fraction	37±6	41± 7		45±6		38±7	43±7		48±8		0.003
Microvascular obstruction in infarct vessels	83 (35)	80 (34)^**	0.846	64 (27)^**	0.073	109 (36)	78 (26)	0.018	59 (20)		0.045	0.049
BL – pre-percutaneous coronary interventions; ML – post-percutaneous coronary interventions at 48 hours before hospital discharge; EL – post-percutaneous coronary interventions at 1-month of interventions. Ordinal data are shown as frequency (percentage) and numerical data are shown as mean±standard deviation (SD). The Fischer’s exact test (between groups) and the chi-square test (within a group) were performed for ordinal data and the Mann-Whitney U test (between groups) or paired -test (within a group) were performed for numerical data. ^* Comparison with respect to BL; ^** insignificant difference with respect to BL.