Coronary microvascular function, insulin sensitivity and body composition in predicting exercise capacity in overweight patients with coronary artery disease

BMC Cardiovascular Disorders

Eva Prescott²  Steen Bendix Haugaard³  Elizaveta Chabanova¹  Martin Snoer²  Rasmus Huan Olsen²  Lene Rørholm Pedersen²  Anders Jürs² 

[1] Department of Radiology, Herlev Hospital, University of Copenhagen, Copenhagen, Denmark;Department of Cardiology, Bispebjerg Hospital, University of Copenhagen, Copenhagen, Denmark;Department of Internal Medicine, Amager Hospital and the Clinical Research Center, Hvidovre Hospital, University of Copenhagen, Copenhagen, Denmark

关键词: Body composition;    Insulin sensitivity;    Exercise capacity;    Coronary artery disease;    Coronary flow reserve;   

Others  :  1234084
DOI  :  10.1186/s12872-015-0151-9

 received in 2015-03-14, accepted in 2015-11-18,  发布年份 2015

【 摘 要 】

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/m ²and 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 (VO ₂ 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. VO ₂ 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 VO ₂ peak in multivariable regression analysis.

Conclusion

The study established CFR, EDV and LVEF as independent predictors of VO ₂ 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 VO ₂ peak. The findings suggest that central hemodynamic factors are important in limiting exercise capacity in overweight non-diabetic CAD patients.

【 授权许可】

   
2015 Jürs et al.

【 图 表 】

Fig. 1.

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