[Evaluation of postoperative hypoxemia with a pulse oximeter]

Area of Science:

• Anesthesiology
• Critical Care Medicine
• Postoperative Care

Background:

• Postoperative hypoxemia is a frequent complication following general or combined anesthesia.
• Monitoring SpO2 (peripheral oxygen saturation) with pulse oximetry is crucial for assessing respiratory status.

Purpose of the Study:

• To investigate the incidence and contributing factors of postoperative hypoxemia.
• To evaluate the efficacy of supplemental oxygen in preventing hypoxemia in the ward.

Main Methods:

• A study involving 48 adult patients undergoing general (G) or epidural and general (E) anesthesia.
• Patients received either 3 L/min oxygen via face mask or room air for the initial 3 hours post-surgery.
• SpO2 levels were monitored for 5 hours in the ward.

Main Results:

• Patients breathing room air experienced SpO2 below 94% (33% in G group, 50% in E group).
• Supplemental oxygen maintained high SpO2 (99% in G, 97.9% in E).
• SpO2 decreased significantly after oxygen cessation, with higher incidence in the E group (58%) compared to G group (25%).
• Age and preanesthetic SpO2 correlated with postoperative SpO2 in the G group.
• Later anesthesia weaning (after 5 p.m.) was associated with lower SpO2.

Conclusions:

• Postoperative hypoxemia occurs frequently in the ward and can persist for hours.
• Low-flow oxygen (3 L/min) via face mask is effective in preventing and managing postoperative hypoxemia.
• Anesthesia management timing and patient factors like age influence postoperative oxygenation.