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June 1, 1982CirculationOpen Access

Oxygen utilization and ventilation during exercise in patients with chronic cardiac failure.

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Authors

KWK. T. WeberGKGary T. KinasewitzJJJoseph S. Janicki

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Overview

Observational study reveals progressive declines in oxygen uptake and anaerobic threshold in chronic heart failure, indicating that gas exchange safely quantifies functional cardiac reserve.

Key Points

  • To evaluate whether ventilatory gas exchange and oxygen utilization during progressive exercise provide an objective assessment of functional impairment and cardiac reserve in chronic heart failure.
  • Measured respiratory air flow, oxygen uptake, carbon dioxide elimination, and minute ventilation during progressive treadmill exercise in 62 patients with stable heart failure.
  • Directly measured exercise cardiac output, systemic oxygen extraction, and mixed venous lactate production in a subset of 40 patients across severity classes.
  • Advancing heart failure severity from class A to D resulted in progressive reductions in exercise duration (from 1157 ± 154 to 373 ± 157 seconds) and maximum oxygen uptake (from 23 ± 3.2 to 8.4 ± 1.5 ml/min/kg), paralleling decreases in maximum cardiac output and stroke volume.
  • The noninvasively determined anaerobic threshold declined from 17 ± 0.34 to 7.1 ± 1.5 ml/min/kg and onset time decreased from 580 ± 17 to 157 ± 7 seconds, correlating with mixed venous lactate elevation without adverse testing events.

Cite This Study

Weber et al. (1982) studied this question.

synapsesocial.com/papers/69f41cebf3e494ed2b7d034ahttps://doi.org/10.1161/01.cir.65.6.1213
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1Ventilatory and gas exchange abnormalities on exercise in chronic heart failure1995 · 26 citations
  2. 2Gas exchange responses to constant work rate exercise in chronic cardiac failure.1994 · 45 citations
  3. 3Ventilatory and Heart Rate Responses after Exercise in Chronic Cardiac Failure1994 · 19 citations
  4. 4Non-invasive Measurement of Cardiac Output and Ventricular Ejection Fractions in Chronic Cardiac Failure: Relationship to Impaired Exercise Tolerance1997 · 11 citations
  5. 5Mechanism of the increased ventilatory response to exercise in patients with chronic heart failure.1990 · 234 citations