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Related Experiment Videos

[Mechanical ventilation during thoracic anesthesia].

F Valenza1

  • 1Istituto di Anestesia e Rianimazione, Policlinico di Milano IRCCS, Milano.

Minerva Anestesiologica
|July 2, 1999
PubMed
Summary

Individual mechanical responses to one lung ventilation vary. Positive end-expiratory pressure (PEEP) may worsen oxygenation in patients with low FEV1, highlighting the need for tailored ventilatory settings.

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Area of Science:

  • Anesthesiology
  • Thoracic Surgery
  • Critical Care Medicine

Background:

  • One lung ventilation (OLV) is crucial for thoracic surgery.
  • Lateral decubitus position during OLV presents unique mechanical challenges.
  • Individual patient factors influence lung mechanics and gas exchange.

Purpose of the Study:

  • To assess individual mechanical and functional responses to open-chest lateral decubitus during OLV.
  • To evaluate the impact of different positive end-expiratory pressure (PEEP) strategies on gas exchange in the dependent lung.
  • To determine if FEV1 (Forced Expiratory Volume in 1 second) can predict responses to PEEP during OLV.

Main Methods:

  • Measured dependent lung pressure-volume (P-V) curves in 19 patients during supine and lateral decubitus positions.
  • Compared P-V curve changes between patients with high and low FEV1.
  • Tested ventilation strategies using zero end-expiratory pressure (ZEEP) or PEEP of 10 cm H2O applied to the dependent lung.
  • Analyzed the effect of PEEP on PaO2/FiO2 ratio stratified by FEV1.

Main Results:

  • Patients with high FEV1 exhibited greater changes in P-V curve shape in lateral decubitus compared to those with low FEV1.
  • Applying PEEP to the dependent lung trended towards improving PaO2/FiO2 in high FEV1 patients.
  • PEEP application to the dependent lung deteriorated PaO2/FiO2 in low FEV1 patients.

Conclusions:

  • Ventilatory settings during OLV in open-chest lateral decubitus require individual tailoring.
  • PEEP may counteract atelectasis in healthier lungs but could impair gas exchange in diseased lungs.
  • FEV1 is a potential biomarker for stratifying PEEP response during OLV.

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