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[Continuous monitoring of coronary sinus oxygen saturation during pacing loading in patients with syndrome X].

Abstract：

:To determine whether patients with syndrome X suffer from myocardial ischemia, coronary sinus oxygen saturation was continuously measured during pacing loading in 31 patients. Subjects were categorized by groups as syndrome X (11 patients), effort angina (14), and old myocardial infarction and valvular heart disease (6). Pacing loading induced evidence of ischemia in all syndrome X patients and in eight of the 11 patients with effort angina, while there was no such evidence in those with old myocardial infarction and valvular heart disease. Coronary sinus oxygen saturation in syndrome X decreased significantly from 44.2 +/- 5.8% to 33.5 +/- 4.4% (p less than 0.01), and it decreased from 47.0 +/- 4.9% to 31.2 +/- 4.0% (p less than 0.01) in effort angina with induced ischemic evidence, indicating that a significant reduction in coronary sinus oxygen saturation reflects the presence of myocardial ischemia. In the group with old myocardial infarction and valvular heart disease, coronary sinus oxygen saturation remained nearly unchanged during pacing. The pattern of depression of coronary sinus oxygen saturation during pacing was steeper in effort angina than in syndrome X. Therefore, we conclude that, although syndrome-X may not be a homogeneous group of patients, most of them may develop myocardial ischemia due to reduced vasodilator reserves of the small coronary artery.

journal_name

J Cardiol

journal_title

Journal of cardiology

authors

Mikuniya A,Kikuchi F,Mikami M,Totsuka H,Narita T,Sasaki N,Takahashi M,Sato M,Onodera K,Oike Y

subject

Has Abstract

pub_date

1990-01-01 00:00:00

pages

39-47

issue

1

eissn

0914-5087

issn

1876-4738

journal_volume

20

pub_type

杂志文章

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