Extracorporeal cardiac shock wave therapy improves left ventricular remodeling after acute myocardial infarction in pigs.

Abstract:

OBJECTIVE:We have recently demonstrated that low-energy extracorporeal shock wave therapy improves chronic myocardial ischemia in pigs and humans. In this study, we examined whether our shock wave therapy is also effective at improving left ventricular remodeling after acute myocardial infarction in pigs. METHODS:Acute myocardial infarction was created by surgically excising the proximal segment of the left circumflex coronary artery (n=20). In the early treatment protocol, the shock wave therapy was started 3 days after acute myocardial infarction, whereas in the late treatment protocol, the therapy was started 4 weeks after acute myocardial infarction (n=5 each). The remaining animals were treated in the same manner, but without the shock wave treatment in each protocol (n=5 each). RESULTS:In the early treatment protocol, left ventricular ejection fraction was higher (42+/-1 vs. 32+/-1%, P<0.001) and left ventricular end-diastolic volume was smaller (95+/-1 vs. 99+/-2 ml, P<0.05) in the shock wave group compared with the control group. Furthermore, wall thickening fraction (32+/-1 vs. 28+/-1%, P<0.01), regional myocardial blood flow (1.7+/-0.2 vs. 1.0+/-0.1 ml/min/g, P<0.01), and number of capillaries in the border zone (1348+/-15 vs. 938+/-34 mm2, P<0.0001) were all significantly improved in the shock wave group compared with the control group. By contrast, in the late treatment group, no such beneficial effects of the shock wave therapy were noted. CONCLUSION:These results suggest that our extracorporeal cardiac shock wave therapy is also an effective and noninvasive therapy for improving left ventricular remodeling after acute myocardial infarction when started in the early phase of the disorder.

journal_name

Coron Artery Dis

journal_title

Coronary artery disease

authors

Uwatoku T,Ito K,Abe K,Oi K,Hizume T,Sunagawa K,Shimokawa H

doi

10.1097/MCA.0b013e328089f19b

subject

Has Abstract

pub_date

2007-08-01 00:00:00

pages

397-404

issue

5

eissn

0954-6928

issn

1473-5830

pii

00019501-200708000-00011

journal_volume

18

pub_type

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