TOPLINE

Among patients undergoing bariatric surgery, higher intraoperative opioid exposure was associated with greater postoperative oxygen desaturation; however, opioid use later during recovery didn’t show this association. Oxygen dips were most common during the first 6 hours after discharge from the postanesthesia care unit (PACU).

METHODOLOGY

• Previous studies in bariatric surgery have largely focused on obstructive sleep apnea (OSA) status or total postoperative opioid exposure, but limited data examined whether opioid administration timing was associated with postoperative oxygen desaturation.
• Researchers retrospectively analyzed 312 patients (median age, 45 years; 87.8% women; median BMI, 42.5) who underwent robotic-assisted Roux-en-Y gastric bypass or sleeve gastrectomy at a tertiary academic medical center between 2022 and 2025.
• Opioid use was recorded in morphine milligram equivalents (MMEs) across intraoperative, PACU, and postoperative periods.
• After discharge from the PACU, patients underwent continuous postoperative monitoring for oxygen saturation (SpO₂), acoustic respiratory rate, and pulse rate for a median of approximately 14.4 hours.
• Desaturation events were defined as either a drop in SpO₂ levels by at least 3% lasting for 30 seconds or longer or absolute SpO₂ levels of 89% or lower.

TAKEAWAY

• Higher intraoperative opioid exposure was independently associated with an increased postoperative desaturation burden, with each additional 1 MME linked to a 2.6% higher desaturation rate (adjusted incidence rate ratio [aIRR], 1.026; P = .048).
• In contrast, opioid exposure in the PACU and throughout the postoperative period was not associated with a postoperative desaturation burden.
• Male sex was independently associated with higher desaturation counts (aIRR, 3.50; P = .034), and increasing age and greater OSA severity showed similar trends but did not reach statistical significance.
• Desaturation events most frequently occurred during the first 6 hours after PACU discharge, highlighting a critical window for respiratory monitoring.

IN PRACTICE

“Clinically, these results emphasize minimizing early perioperative opioid exposure through opioid-sparing and multimodal analgesia, particularly intraoperatively and in the PACU. They also support enhanced early postoperative monitoring, especially during the first night, when recurrent desaturation is most likely. Collectively, these findings suggest potential refinement of anesthesia protocols, PACU discharge criteria, and ward-level monitoring strategies to improve safety in patients at high risk,” the study authors wrote.

SOURCE

The study was led by Katherine Cappellano, University of South Florida, Tampa. It was published online in Obesity Surgery.

LIMITATIONS

This study had a single-center design, which may have limited the generalizability of the findings. Opioid exposure was assessed using MMEs rather than plasma levels. The median postoperative monitoring period of 14.4 hours may have missed later respiratory events.

DISCLOSURES

Funding information for the study was not explicitly mentioned. The authors declared having no competing interests.

This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication.