Risk Factors for Desaturation in Anesthetic Management During Airway Stenting

Airway stenting involves a stent being inserted into a stenotic site in the airway. In patients with airway stenosis, the airway is the surgical field; therefore, anesthetic management is challenging, and avoiding hypoxia is important. Limited information is available on the anesthetic management of airway stenting. Risk factors for oxygen desaturation during airway stenting remain unknown. The present study was conducted to retrospectively examine patients who underwent airway stenting during a specific period and identify risk factors associated with oxygen desaturation. We performed univariate and multivariate analyses. The main evaluation items in a multivariate analysis were risk factors for desaturation (SpO₂ ≤ 90%). Body mass index, preoperative orthopnea, the stenotic site of the airway, and severity of stenosis were selected for clinical usefulness. We analyzed 302 patients who underwent airway stenting at our hospital between July 2011 and June 2014 under general anesthesia with controlled ventilation. Total intravenous anesthesia with propofol target-controlled infusion and remifentanil was performed. Clinical data were extracted from electronic anesthetic records. The incidence of desaturation (SpO₂ ≤ 90%) was 18.5% (56 out of 302 cases). Preoperative orthopnea (OR, 3.06)and stenosis distal to the bronchus (OR, 3.31) were identified as risk factors for desaturation in a multivariate analysis. We herein identified risk factors for desaturation during airway stenting. Anesthetic plans need to be carefully considered for patients with these risk factors.