Monitor OSA patients post-bariatric surgery with pulse oximetry
Other
2016
Anesthesia and analgesia
Airway management difficult post-op in OSA patients
4 resolved citations behind this deck; every point above traces to one of them.
THE NUMBERS
The excess risk is respiratory first, cardiac second
Roughly a doubling of respiratory failure and unplanned ICU transfer. The plan that follows is about ventilation and monitoring, not about cancelling the case.
Anesthetic and sedative drug agents worsen upper airway collapsibility and depress central respiratory activity.
Perioperative Management of the Patient With Obstructive Sleep Apnea: A Narrative Review, Anesthesia and analgesia 2021 · PMID 33857965
IN PRACTICE
Monitor OSA patients post-bariatric surgery with pulse oximetry
Other · Surgery for obesity and related di
OSA patients undergoing bariatric surgery should be continuously monitored with pulse oximetry in the early postoperative period.
Perioperative management of obstructive sleep apnea in bariatric surgery: a consensus guideline, Surgery for obesity and related diseases : official journal of the American Society for Bariatric Surgery 2017 · PMID 28666588
IN PRACTICE
Airway management difficult post-op in OSA patients
Other · Anesthesia and analgesia
Difficulty in airway management is a common complication in OSA patients undergoing surgery, occurring intraoperatively, in the PACU, or on surgical floors.
Perioperative Complications in Obstructive Sleep Apnea Patients Undergoing Surgery: A Review of the Legal Literature, Anesthesia and analgesia 2016 · PMID 26111263
IN THE ROOM
What this changes about the next case
Colour is the strength of the evidence behind each step, not the urgency.
1
1
OSA patients have a higher risk of both difficult ventilation and intubation in the operating room.
2
2
Anesthetic and sedative drug agents worsen upper airway collapsibility and depress central respiratory activity.
3
3
OSA patients undergoing bariatric surgery should be continuously monitored with pulse oximetry in the early postoperative period.
4
4
Difficulty in airway management is a common complication in OSA patients undergoing surgery, occurring intraoperatively, in the PACU, or on surgical floors.
The oral-boards stem on the next slide puts these into one scenario.
KEY TAKEAWAYS
What to carry into the next case
OSA increases OR ventilation/intubation difficulty
Monitor OSA patients post-bariatric surgery with pulse oximetry
Airway management difficult post-op in OSA patients
Anesthesia and analgesia 2016
OSA patients face higher risks for difficult airways and respiratory depression during and after anesthesia; monitor closely.
Questions I'll ask you in the room
How does OSA impact airway management during induction?
What are the specific risks associated with postoperative respiratory depression in OSA patients?
How might preoperative CPAP use affect anesthetic requirements?
What monitoring strategies are particularly important for OSA patients intraoperatively?
Oral boards stem
A 52-year-old with a BMI of 44 and untreated obstructive sleep apnea presents for laparoscopic cholecystectomy and will need postoperative opioids.
Board questions
1. In a meta-analysis of 17 studies and 7,162 surgical patients, what was the odds ratio for postoperative respiratory failure in patients with obstructive sleep apnoea compared with those without?
2.42
1.63
5.10
1.05
Show answer
A. 2.42
Respiratory failure OR 2.42, ICU transfer OR 2.46, cardiac events OR 1.63. The excess risk is respiratory first and cardiac second, which is what shapes the monitoring plan.
Kaw et al., Postoperative complications in patients with obstructive sleep apnea: a meta-analysis, J Clin Anesth 2014 · PMID 25439403
2. Given that OSA roughly doubles the odds of postoperative respiratory failure and unplanned ICU transfer, what does that evidence actually justify doing, and what does it not justify?
Show answer
It justifies planning for a respiratory risk that is roughly doubled: anticipating airway and ventilation problems, and monitoring accordingly. It does not justify cancelling or deferring surgery on the basis of an OSA diagnosis alone — the meta-analysis measured associations with complications among patients who had surgery, and says nothing about the outcomes of postponement.
An odds ratio for a complication tells you how to prepare, not whether to proceed.
Kaw et al., Postoperative complications in patients with obstructive sleep apnea: a meta-analysis, J Clin Anesth 2014 · PMID 25439403
3. Heterogeneity was low in this meta-analysis for respiratory failure and cardiac events, with I² values of 5% and 0%. Why does that matter when you quote these odds ratios?
Show answer
Low I² means the included studies produced relatively consistent effect estimates rather than disagreeing with one another, so the pooled odds ratio is summarising a coherent set of results rather than averaging conflicting ones. It says nothing about risk of bias within those studies, which still matters. The authors also report that results did not materially change in sensitivity analyses across different inclusion criteria.
Consistency between studies and quality of studies are different questions. I² answers only the first.
Kaw et al., Postoperative complications in patients with obstructive sleep apnea: a meta-analysis, J Clin Anesth 2014 · PMID 25439403
The bottom lineOSA patients face higher risks for difficult airways and respiratory depression during and after anesthesia; monitor closely.
Sources
[1] Perioperative management of obstructive sleep apnea: a systematic review, Minerva anestesiologica 2018 · PMID 28402089 open
[2] Perioperative Management of the Patient With Obstructive Sleep Apnea: A Narrative Review, Anesthesia and analgesia 2021 · PMID 33857965 open
[3] Perioperative management of obstructive sleep apnea in bariatric surgery: a consensus guideline, Surgery for obesity and related diseases : official journal of the American Society for Bariatric Surgery 2017 · PMID 28666588 open
[4] Perioperative Complications in Obstructive Sleep Apnea Patients Undergoing Surgery: A Review of the Legal Literature, Anesthesia and analgesia 2016 · PMID 26111263 open
[5] Kaw et al., J Clin Anesth 2014 (meta-analysis, 17 studies) · PMID 25439403 open