Combined use of external therapeutic ultrasound and tirofiban has synergistic therapeutic effects on no-reflow after myocardial reperfusion.

Abstract

OBJECTIVE: This study aimed to evaluate the effects of the combined use of external therapeutic ultrasound (ETUS) and the specific glycoprotein IIb/IIIa inhibitor tirofiban on myocardial no-reflow in a canine model of acute myocardial infarction after reperfusion. METHODS: The canine myocardial no-reflow model was established by a 3-hour occlusion of the left anterior desecending coronary artery followed by a 2-hour reperfusion. Twenty-four canines were divided into four groups (6/group): (1) control, (2) tirofiban alone, (3) ETUS combined with tirofiban (ETUS + tirofiban), and (4) ETUS alone. RESULTS: The area of no-reflow in each of the three treatment groups was significantly decreased, compared with the control group, with the ETUS + tirofiban group having the smallest area. Also, the ETUS + tirofiban group had the highest recanalized rate of microvessels in the no-reflow area and fewer impaired cellular organelles. The recovery rates of the endocardial and middle circumferential strain as well as longitudinal strain in the ETUS + tirofiban group were significantly greater than those of the tirofiban group. Moreover, the expression of hypoxia-inducible factor-1α (HIF-1α) was significantly increased in the ETUS + tirofiban group, compared with the other groups. CONCLUSIONS: The combined use of ETUS and tirofiban offers synergistic benefits for the treatment of myocardial no-reflow.