Anesthetic management for simultaneous drug-induced sleep endoscopy and maxillomandibular advancement in a patient with obstructive sleep apnea

Efficacy of high-flow nasal oxygen during drug-induced sleep endoscopy in patients with obstructive sleep apnea

PURPOSE

High-flow nasal oxygenation (HFNO) can provide a low level of continuous positive airway pressure and alveolar recruitment. We aimed to compare the efficacy of pre-oxygenation with HFNO and low-flow nasal oxygenation (LFNO) during drug-induced sleep endoscopy (DISE).

METHODS

In the LFNO group, preoxygenation was performed for 10 min at 3 L·min-1. In the HFNO group, preoxygenation was performed for 10 min at 30 L·min-1 at a fraction of inspired oxygen of 100% using the Optiflow device. From the start of sedative administration to the end of DISE, vital signs were monitored continuously. The primary outcome was the lowest oxygen saturation (SpO2) during DISE.

RESULTS

Of 24 patients enrolled, 12 were randomly assigned to the LFNO and 12 to the HFNO groups. The prevalence of hypoxia events was 75% in the LFNO group and 58% in the HFNO group. The difference in lowest oxygen saturation between the two groups was not significant between the two groups (P=0.665). The lowest SpO2 during all procedures was comparable between the two groups (86.8 ± 6.5% in the LFNO group and 87.2 ± 8.0% in the HFNO group; P=0.912).

CONCLUSIONS

The findings suggest that HFNO may not be superior to LFNO as a preoxygenation tool to prevent hypoxia during DISE.

Preoperative risk evaluation and perioperative management of patients with obstructive sleep apnea: a narrative review

Obstructive sleep apnea (OSA) is a common sleep-breathing disorder associated with significant comorbidities and perioperative complications. This narrative review is aimed at comprehensively overviewing preoperative risk evaluation and perioperative management strategies for patients with OSA. OSA is characterized by recurrent episodes of upper airway obstruction during sleep leading to hypoxemia and arousal. Anatomical features, such as upper airway narrowing and obesity, contribute to the development of OSA. OSA can be diagnosed based on polysomnography findings, and positive airway pressure therapy is the mainstay of treatment. However, alternative therapies, such as oral appliances or upper airway surgery, can be considered for patients with intolerance. Patients with OSA face perioperative challenges due to difficult airway management, comorbidities, and effects of sedatives and analgesics. Anatomical changes, reduced upper airway muscle tone, and obesity increase the risks of airway obstruction, and difficulties in intubation and mask ventilation. OSA-related comorbidities, such as cardiovascular and respiratory disorders, further increase perioperative risks. Sedatives and opioids can exacerbate respiratory depression and compromise airway patency. Therefore, careful consideration of alternative pain management options is necessary. Although the association between OSA and postoperative mortality remains controversial, concerns exist regarding adverse outcomes in patients with OSA. Understanding the pathophysiology of OSA, implementing appropriate preoperative evaluations, and tailoring perioperative management strategies are vital to ensure patient safety and optimize surgical outcomes.

Can Bispectral Index Monitoring (EEG) be an Early Predictor of Respiratory Depression under Deep Sedation during Endoscopic Retrograde Cholangiopancreatography?

Objectives:

The more often the endoscopy sedation is performed, the more the risk of adverse events, and therefore, advanced monitoring becomes more and more essential in endoscopy units. The present study aims to evaluate whether the Bispectral Index (BIS) monitoring is an early predictor of respiratory depression and to determine the compliance between commonly used clinical sedation score.

Methods:

This study was approved by the ethics committee. The sample consisted of 60 patients aged 18 to 50 years with an American Society of Anesthesiologists (ASA) physical status of I scheduled for endoscopic retrograde cholangiopancreatography (ERCP). All patients received propofol mediated sedation. Ramsay sedation score (RSS) was used as a clinical sedation score to assess the depth of sedation. Participants were attached to a BIS monitor. Perioperative hemodynamics, BIS values, the mean dose of propofol, procedure duration, apnea, frequency of oxygen desaturation and airway-related interventions, as well as demographic parameters, were recorded. BIS scores were blinded to RSS data.

Results:

The study sample consisted of 60 patients (36 females) aged 18 to 50 years (mean: 36.10±8.02). The mean procedure time and the dose of propofol were 32.70±1.79 min and 287.17±59.66 mg, respectively. The cut-off values for respiratory depression were as follows. At the 15th min of measurement, the BIS score of 60 had 96.2% sensitivity and 42.9% specificity. At the 20th min of measurement, the BIS score of 59.50 had 98.2% sensitivity and 100.0% specificity. At the 25th min of measurement, the BIS score of 59.00 had 98.3% sensitivity and 50.0% specificity. Regression analysis showed that the mean BIS score (p=0.000, 95%CI-0.110-0.043) increased by 0.076 with a unit increase in the RSS.

Conclusion:

BIS was highly correlated with RSS, and therefore, can be used to avoid respiratory depression during sedation.