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Published on: October 1, 2019
Excess ventilation during exercise and prognosis in chronic heart failure
1Department of Medicine, Harbor-UCLA Medical Center, Torrance, CA 90509-2910, USA. dsue@ucla.edu
American Journal of Respiratory and Critical Care Medicine
|January 25, 2011
Summary
Patients with chronic heart failure (CHF) show excess ventilation during exercise, a key indicator of prognosis. This physiological response, measured by ventilation-to-carbon dioxide output ratios, helps identify high-risk individuals needing advanced treatments.
Area of Science:
- Cardiology
- Pulmonary Physiology
- Exercise Medicine
Background:
- Patients with chronic heart failure (CHF) often experience dyspnea and exhibit abnormal ventilation patterns during exercise.
- An increased ventilation relative to carbon dioxide output (Ve/Vco2) is a hallmark of CHF during physical exertion compared to healthy individuals.
Purpose of the Study:
- To investigate the significance of excess ventilation during exercise in patients with chronic heart failure.
- To explore the predictive value of ventilation parameters in assessing outcomes for CHF patients.
Main Methods:
- Measuring ventilation (Ve) and carbon dioxide output (Vco2) during exercise tests.
- Analyzing variables such as the slope of Ve versus Vco2, the lowest Ve/Vco2 ratio, and the Ve/Vco2 ratio at specific exercise thresholds.
Main Results:
- The degree of excess ventilation during exercise in CHF patients is a strong predictor of clinical outcomes.
- Elevated Ve/Vco2 ratios identify patients at higher risk, potentially requiring interventions like heart transplantation.
Conclusions:
- Excess ventilation during exercise is a critical prognostic marker in chronic heart failure.
- Understanding the mechanisms, possibly involving chemoreceptor or ergoreceptor activity, enhanced dead space, or early lactic acidosis, is crucial for managing CHF patients.
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