Spontaneous Breathing Mode: A Risk for Hypoxemia During OLV?

Association Between Spontaneous Breathing Mode and Hypoxemia During One-Lung Ventilation Under General Anesthesia

Patients undergoing thoracic surgery with one-lung ventilation (OLV) are prone to hypoxemia, which is primarily attributable to pulmonary ventilation-perfusion (V/Q) mismatch. This study will preoperatively assess the distribution of pulmonary ventilation under spontaneous breathing and intraoperatively record the lowest peripheral oxygen saturation (SpO₂) during OLV. The aim is to investigate the correlation between these two parameters. The findings are expected to facilitate the prediction of hypoxemia in thoracic surgical patients undergoing OLV.

Inclusion Criteria:

• Age ≥ 18 years

  • BMI > 18.5 and < 30
  • Informed consent obtained

Exclusion Criteria:

• • Inability to use the EIT belt preoperatively

  • Failure to implement one-lung ventilation during surgery