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Exercise physiology in patients with left ventricular assist devices
1Department of Physical Therapy, Virginia Commonwealth University, Medical College of Virginia Health Sciences Campus, Richmond 23298-0224, USA.
Journal of Cardiopulmonary Rehabilitation
|March 1, 1997
Summary
Left Ventricular Assist Device (LVAD) use enables exercise rehabilitation for heart failure patients awaiting transplantation. Exercise training improves submaximal tolerance and the transplant experience, proving safe and beneficial for this population.
Area of Science:
- Cardiology
- Rehabilitation Medicine
- Biomedical Engineering
Background:
- Increasing use of Left Ventricular Assist Devices (LVADs) in heart failure patients.
- LVADs provide mechanical circulatory support, enabling exercise rehabilitation.
- Severely impaired patients can undergo exercise before cardiac transplantation.
Purpose of the Study:
- To evaluate exercise training responses in patients with LVADs.
- To assess the safety and efficacy of early mobilization and progressive exercise.
- To understand the impact of LVADs on exercise parameters and patient outcomes.
Main Methods:
- Analysis of exercise responses including cardiac output, heart rate, blood pressure, and perceived exertion.
- Monitoring of patients undergoing progressive exercise training post-LVAD implantation.
- Review of existing evidence on LVAD patients and exercise.
Main Results:
- LVADs provide significant cardiac output (≥10 L/min), supporting exercise.
- Native left ventricle contributes modestly during exercise.
- Submaximal exercise tolerance shows greater improvement than peak oxygen consumption.
- Heart rate and LVAD rate increase similarly during exercise; blood pressure normalizes.
- Ratings of perceived exertion are reliable indicators in this population.
Conclusions:
- Early mobilization and progressive exercise training are safe for LVAD patients.
- Exercise improves the transplantation experience.
- Adequate cardiac output from LVADs supports moderate exercise while awaiting transplant.
- Central oxygen consumption is limited by LVAD parameters, but functional capacity is enhanced.