Coronary microvascular function, insulin sensitivity and body composition in predicting exercise capacity in overweight patients with coronary artery disease. Issue 1 (December 2015)

• Record Type: Journal Article
• Authors: Jürs, Anders; Pedersen, Lene; Olsen, Rasmus; Snoer, Martin; Chabanova, Elizaveta; Haugaard, Steen; Prescott, Eva
• Is Part Of: BMC cardiovascular disorders. Volume 15:Issue 1(2015)
• Page Start: 1
• Page End: 9
• Publication Date: 2015-12
• Subjects: Coronary flow reserve -- Coronary artery disease -- Exercise capacity -- Insulin sensitivity -- Body composition; Cardiovascular system -- Diseases -- Periodicals; 616.12005
• DOI: 10.1186/s12872-015-0151-9
• Languages: English
• ISSNs: 1471-2261

Abstract

Abstract Background Coronary artery disease (CAD) has a negative impact on exercise capacity. The aim of this study was to determine how coronary microvascular function, glucose metabolism and body composition contribute to exercise capacity in overweight patients with CAD and without diabetes. Methods Sixty-five non-diabetic, overweight patients with stable CAD, BMI 28–40 kg/m2 and left ventricular ejection fraction (LVEF) above 35 % were recruited. A 3-hour oral glucose tolerance test was used to evaluate glucose metabolism. Peak aerobic exercise capacity (VO2 peak) was assessed by a cardiopulmonary exercise test. Body composition was determined by whole body dual-energy X-ray absorptiometry scan and magnetic resonance imaging. Coronary flow reserve (CFR) assessed by transthoracic Doppler echocardiography was used as a measure of microvascular function. Results Median BMI was 31.3 and 72 % had impaired glucose tolerance or impaired fasting glucose. VO2 peak adjusted for fat free mass was correlated with CFR (r = 0.41, p = 0.0007), LVEF (r = 0.33, p = 0.008) and left ventricular end-diastolic volume (EDV) (r = 0.32, p = 0.01) while it was only weakly linked to measures of glucose metabolism and body composition. CFR, EDV and LVEF remained independent predictors of VO2 peak in multivariable regression analysis. Conclusion The study established CFR, EDV and LVEF as independent predictors of VO2 peak in overweight CAD patients with no or only mild functional symptoms and a LVEF > 35 %. Glucose metabolism and body composition had minor impact on VO2 peak. The findings suggest that central hemodynamic factors are important in limiting exercise capacity in overweight non-diabetic CAD patients.