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Lung mechanical behavior during one-lung ventilation

G M Barnas1, J Sprung, D Choi

  • 1Department of Anesthesiology, University of Maryland, Baltimore, USA.

Journal of Cardiothoracic and Vascular Anesthesia
|August 1, 1997
PubMed
Summary
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One-lung ventilation significantly increases lung elastance and resistance, but unlike pulmonary edema, these changes are not dependent on tidal volume. This suggests additional mechanisms influence lung mechanics during one-lung ventilation.

Area of Science:

  • Anesthesiology
  • Pulmonary Medicine
  • Critical Care

Background:

  • One-lung ventilation (OLV) is a critical procedure in thoracic surgery.
  • Changes in lung mechanics during OLV may mimic pulmonary edema.
  • Understanding these mechanical changes is vital for patient management.

Purpose of the Study:

  • To measure lung mechanical properties during OLV.
  • To compare these changes with those observed in pulmonary edema.
  • To investigate the influence of tidal volume and respiratory frequency on lung mechanics during OLV.

Main Methods:

  • Prospective study conducted in a research laboratory setting.
  • Beagle dogs were anesthetized and ventilated using a bronchial blocker for OLV.
  • Lung elastance (EL) and resistance (RL) were measured across various frequencies and tidal volumes.

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Main Results:

  • During OLV, lung elastance (EL) doubled, and lung resistance (RL) increased at most frequencies.
  • Unlike pulmonary edema, EL and RL during OLV showed no dependence on tidal volume.
  • Frequency dependence of RL did not increase significantly during OLV.

Conclusions:

  • The mechanical changes during OLV differ from those seen in pulmonary edema, particularly regarding tidal volume independence.
  • While reduced lung volume contributes to increased elastance, other factors are involved in pulmonary edema's mechanical alterations.
  • Further research is needed to elucidate the mechanisms underlying lung mechanical changes during severe pulmonary edema.