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Specific anesthesia-induced lung volume changes from induction to emergence: a pilot study.

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Acta Anaesthesiologica Scandinavica
|November 7, 2017
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A combination of lung recruitment maneuver (LRM), positive end-expiratory pressure (PEEP), and continuous positive airway pressure (CPAP) effectively maintained lung volume during anesthesia and post-extubation. Expiratory muscle activity was found to reduce lung volume during emergence.

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Area of Science:

  • Anesthesiology
  • Respiratory Physiology
  • Critical Care Medicine

Background:

  • Previous studies on maintaining intraoperative lung volume were inconclusive due to confounding factors.
  • General anesthesia and surgical procedures impact lung volume differently.
  • This study isolates the effects of anesthesia on lung volume.

Purpose of the Study:

  • To assess lung volume changes during anesthesia without surgical interference.
  • To evaluate a three-intervention strategy for maintaining lung volume.
  • To investigate respiratory muscle activation during emergence from anesthesia.

Main Methods:

  • Eighteen patients undergoing ENT surgery were randomized into intervention and control groups.
  • The intervention group received lung recruitment maneuver (LRM), positive end-expiratory pressure (PEEP), and continuous positive airway pressure (CPAP).
  • End-expiratory lung volume (EELV) was monitored using opto-electronic plethysmography; respiratory muscle activity was measured in a subset.

Main Results:

  • EELV decreased post-induction in both groups but was maintained in the intervention group after LRM.
  • The control group showed further EELV decrease at emergence due to expiratory muscle contraction.
  • The intervention group maintained high EELV even after extubation.

Conclusions:

  • A combined LRM, PEEP, and CPAP strategy effectively preserves EELV during and after anesthesia.
  • Active expiratory muscle contraction during emergence can significantly reduce EELV.
  • This approach offers a promising method to mitigate post-operative pulmonary complications.