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Plasma catecholamines and oxygen consumption during weaning from mechanical ventilation.

T E Oh1, S Bhatt, E S Lin

  • 1Department of Anaesthesia and Intensive Care, Chinese University, Prince of Wales Hospital, Shatin, Hong Kong.

Intensive Care Medicine
|January 1, 1991
PubMed
Summary

The increase in oxygen consumption during mechanical ventilation weaning does not solely reflect respiratory muscle effort. Elevated plasma catecholamines increase metabolic rate, making this measure an unreliable predictor of successful weaning.

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Area of Science:

  • Critical Care Medicine
  • Respiratory Physiology
  • Clinical Physiology

Background:

  • Previous studies assumed increased oxygen consumption (VO2) during mechanical ventilation weaning reflected respiratory muscle oxygen consumption (VO2RESP).
  • This assumption led to the proposal of delta VO2 as a weaning predictor.

Purpose of the Study:

  • To investigate the factors contributing to increased oxygen consumption during mechanical ventilation weaning.
  • To evaluate the accuracy of delta VO2 as a predictor of successful weaning from mechanical ventilation.

Main Methods:

  • Measured oxygen consumption (VO2), CO2 production (VCO2), and plasma catecholamines in 20 patients undergoing weaning via SIMV and CPAP.
  • Analyzed changes in VO2 as a percentage of baseline (delta VO2%) during spontaneous breathing.

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Main Results:

  • Delta VO2% ranged from 4.8% to 41.5%, with significant increases in VCO2, plasma adrenaline, and noradrenaline.
  • Increased plasma catecholamines are calorigenic, indicating that delta VO2 does not solely represent VO2RESP.
  • While mean delta VO2% differed between successful and failed weaning groups, significant overlap precluded its use as an accurate predictor.

Conclusions:

  • The assumption that delta VO2 during weaning reflects only respiratory muscle oxygen consumption is incorrect due to the calorigenic effects of elevated plasma catecholamines.
  • Delta VO2% is not an accurate predictor of weaning success due to wide individual variability.