ISSN:
1619-7089
Keywords:
Syndrome X
;
Continuous ventricular function monitor
;
Supine exercise
;
VEST
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Abstract Left ventricular function during exercise and recovery was investigated in patients with angina pectoris, ST segment depression during exercise and angiographically normal coronary arteries (syndrome X) using a continuous left ventricular function monitor with cadmium telluride detector (CdTe-VEST). Fourteen patients with syndrome X and 14 patients with atypical chest pain without ST segment depression during exercise and normal coronary arteries (control group) performed supine ergometric exercise after administration of 740–925 MBq of technetium-99m labelled red blood cells, and left ventricular function was monitored every 20 s using CdTe-VEST. Left ventricular ejection fraction (EF) response was impaired (≤55% increase from rest to peak exercise) in 11 or 14 patients with syndrome X but in none of the control patients. Resting EF was similar in the two groups (62.1%±6.7% in patients with syndrome X, 61.9%±6.2% in controls); however, EF increase from rest to peak exercise was lower in syndrome X (−3.1±9.5% vs 14.7%±7.4%, P 〈0.001). After cessation of exercise, all patients showed rapid EF increase over baseline and this EF overshoot was lower (19.3%±8.3% vs 26.4%±7.3%, P 〈0.001) with the time to EF overshoot longer (114±43 s vs 74±43 s, P〈0.05) in patients with syndrome X. Thus, in patients with syndrome X, left ventricular dysfunction was frequently observed during exercise in spite of normal epicardial coronary arteries.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00175754
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