Characterization of exercise limitations by evaluating individual cardiac output patterns: a prospective cohort study in patients with chronic heart failure

BMC Cardiovascular Disorders

Hareld M.C. Kemps⁴  Pieter A.F.M. Doevendans⁵  Pieter F.F. Wijn¹  Jasper P. Jansen²  Bart Wessels³  Victor M. Niemeijer⁴  Ruud F. Spee⁴ 

[1] Department of Applied Physics, Eindhoven University of Technology, Eindhoven, The Netherlands;Department of Clinical Physics and Clinical Informatics, Máxima Medical Centre Veldhoven, Veldhoven, The Netherlands;Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands;Department of Cardiology, Máxima Medical Centre, De Run 4600, Veldhoven 5500 MB, The Netherlands;Department of Cardiology, University Medical Centre Utrecht, Utrecht, The Netherlands

关键词: Exercise intolerance;    Chronic heart failure;    Patterns;    Oxygen uptake;    Cardiac output;   

Others  :  1216154
DOI  :  10.1186/s12872-015-0057-6

 received in 2014-12-07, accepted in 2015-06-12,  发布年份 2015

【 摘 要 】

Background

Patients with chronic heart failure (CHF) suffer from exercise intolerance due to impaired central hemodynamics and subsequent alterations in peripheral skeletal muscle function and structure. The relative contribution of central versus peripheral factors in the reduced exercise capacity is still subject of debate. The main purpose was to investigate heterogeneity in the nature of exercise intolerance by evaluating individual cardiac output (Q) patterns. The secondary purpose was to evaluate whether patient and disease characteristics were associated with a central hemodynamic exercise limitation.

Methods

Sixty-four stable CHF patients performed a symptom limited incremental exercise test with respiratory gas analysis and simultaneous assessment of Q, using a radial artery pulse contour analysis method. A central hemodynamic exercise limitation was defined as a plateau or decline in Q from 90 to 100 % of exercise duration.

Results

Data from 61 patients were analyzed. A central hemodynamic exercise limitation was observed in 21 patients (34 %). In these patients, a higher occurrence of a plateau/decrease in oxygen uptake (VO ₂ ) (52 % vs 23 %, p = 0.02), stroke volume (SV) (100 % vs. 75 %, p = 0.01) and chronotropic incompetence (31 % vs. 2.5 %, p = 0.01) was observed, while presence of a left bundle branch block (LBBB) occurred significantly less (19 % vs 48 %, p = 0.03) There was no difference in disease characteristics such as etiology, duration, NYHA class, mitral regurgitation or ischemia.

Conclusions

The study revealed considerable heterogeneity in the nature of exercise limitations between moderately impaired CHF patients. In one third of the study population a plateau or decrease in Q towards peak exercise was demonstrated, which is indicative of a central hemodynamic exercise limitation. A central hemodynamic exercise limitation was associated with an impairment to augment stroke volume and heart rate.

【 授权许可】

   
2015 Spee et al.

【 图 表 】

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