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The aortic distensibility alteration is an index of influence of ischemic preconditioning to myocardial performance.

Abstract：

BACKGROUND:Ischemic preconditioning (IP) is a cardioprotective phenomenon, induced by brief episodes of myocardial ischemia, which is supposed to affect not only the myocardium, but also the entire cardiovascular system. Considering that patients with coronary artery disease (CAD) have also been described to present impaired aortic mechanical properties, we tried to investigate the possible influence of the late phase of IP on aortic distensibility in patients with CAD. METHODS:Fifty patients, aged 48 to 72 (mean, 57+/-6 years), with angiographically confirmed CAD and exercise-induced myocardial ischemia, underwent two treadmill exercise testings (ETs). The second ETs was performed the next day. Thallium-201 scintigraphy was performed during the first and the second ET. Aortic distensibility was evaluated before each exercise testing by a non-invasive technique, using two-dimensional guided M-mode transthoracic echocardiography and arterial pressure was measured simultaneously at the brachial artery by sphygmomanometry. RESULTS:The patients were divided in 2 groups according to the extent of myocardial ischemia at peak exercise of the second test, compared to the first test. In 35 (70%) of the studied patients ischemia signs were reduced during the second ET (Group A), while in the rest 15 (30%) of the patients (Group B) no improvement or even worsening of the observed ischemia signs was demonstrated by the studied exercise parameters and the extent of myocardial ischemia in thallium-scintigraphy. Increased aortic distensibility during the second measurement was found in 33 (94%) of the 35 patients of Group A but only in 1 (7%) of the 15 patients of Group B. Aortic distensibility was found to be significantly improved in patients of Group A, while it was found to be worsened in Group B patients. CONCLUSIONS:The aortic distensibility alteration could be used as an index of influence of ischemic preconditioning to exercise-induced myocardial ischemia, which could be considered indicative of the systemic effects of IP in humans.

journal_name

Int J Cardiol

journal_title

International journal of cardiology

authors

Michaelides AP,Tousoulis D,Fourlas CA,Andrikopoulos GK,Dilaveris PE,Aggeli KD,Psomadaki ZD,Stefanadis CI

doi

10.1016/j.ijcard.2005.11.004

subject

Has Abstract

pub_date

2006-10-26 00:00:00

pages

76-81

issue

1

eissn

0167-5273

issn

1874-1754

pii

S0167-5273(05)01332-X

journal_volume

113

pub_type

杂志文章

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