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Effects of cold stimulation on coronary haemodynamics during exercise in patients with coronary artery disease.

Abstract：

:To assess if cold-induced vasoconstriction may persist during exercise and contribute to the development of myocardial ischaemia, we studied 11 patients with exertional angina and angiographically proven coronary artery disease, in all cases involving the proximal portion of the left anterior descending artery. Great cardiac vein flow (GCVF) was measured by the thermodilution technique and the coronary resistance of the abnormally perfused anterior region (ARCR) was calculated as the quotient of mean arterial pressure and GCVF. All patients performed a supine bicycle exercise test (ET1) until angina occurred. After recovery, they underwent a cold pressor test (CPT) and then performed a second exercise test (ET2) while cold stimulation was continued. During ET1, ARCR decreased (from 1.53 +/- 0.43 to 1.04 +/- 0.35 mmHg ml-1 min-1, P less than 0.001) as a result of the metabolic vasodilation, while it rose, although non significantly, during CPT despite the increase in double product (P less than 0.001), reflecting the augmented myocardial oxygen consumption. However, such abnormal response to CPT did not persist during ET2, because ARCR decreased to a value non significantly different from that achieved at peak ET1. In five patients, who showed a reduced exercise tolerance during ET2, ARCR dropped by 22% during ET2 compared with 34% decrease during ET1. However, such a difference was unlikely to account for the reduction in exercise tolerance, because the double product at peak ET2 was never lower than the corresponding value at peak ET1. Our data show that the inappropriate vasoconstriction induced by CPT in an abnormally perfused myocardial region does not persist during exercise, when metabolic vasodilation occurs.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Eur Heart J

journal_title

European heart journal

authors

de Servi S,Mussini A,Angoli L,Ferrario M,Bramucci E,Gavazzi A,Ghio S,Ardissino D,Specchia G

doi

10.1093/oxfordjournals.eurheartj.a061847

subject

Has Abstract

pub_date

1985-03-01 00:00:00

pages

239-46

issue

3

eissn

0195-668X

issn

1522-9645

journal_volume

6

pub_type

杂志文章

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