Abstract
In patients with obstructive sleep apnea, short-term use of a continuous positive airway pressure mask improves oxygenation, decreases the apnea-hypopnea index, and reduces hemodynamic instability. In this study, we investigated the effects of use of a continuous positive airway pressure mask in patients at high risk of obstructive sleep apnea during propofol sedation after spinal anesthesia. Forty patients who underwent propofol sedation after spinal anesthesia for transurethral bladder or prostate resection with a STOP-Bang score of 3 or more were enrolled in this study. Patients were randomly divided into two groups: a simple oxygen mask group (n = 20) and a continuous positive airway pressure mask group (n = 20). After spinal anesthesia, propofol was injected at a target concentration of 1.3 mcg/ml via a target concentration control injector. ApneaLink™ was applied to all patients. Patients in the simple oxygen mask group were administered oxygen at a rate of 6 L/min through a simple facial mask. Patients in the CPAP mask group were connected to a pressurizer, and oxygen (6 L/min, 5–15 cm H2O) was administered. Blood pressure, heart rate, respiratory rate, and oxygen saturation were recorded preoperatively, after spinal anesthesia, and every 5 min after the injection of propofol to observe hemodynamic changes. Apnea-hypopnea index was estimated using ApneaLink™. There were no significant differences in hemodynamic changes between the two groups. Apnea-hypopnea index was significantly reduced in the continuous positive airway pressure mask group compared to the simple facial mask group. Application of a continuous positive airway pressure mask in a patient at high risk of obstructive sleep apnea can lower the incidence of obstructive sleep apnea during sedation without a significant effect on hemodynamic stability.
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Appendix
Appendix
1.1 STOP-bang questionnaire
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1.
Snoring
Do you snore loudly (loud enough to be heard through closed doors or wakes your bed-partner at night)?
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2.
Tired
Do you often feel tired, fatigued, or sleepy during the daytime (such as falling asleep during driving or talking to someone)?
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3.
Observed
Has anyone observed you stop breathing or choking/gasping during your sleep?
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4.
Pressure
Do you have or are you being treated for high blood pressure?
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5.
BMI
Body mass index more than 35 kg/m2?
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6.
Age
Age older than 50?
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7.
Neck circumference
Neck size large? (measured around Adam’s apple).
For males, is your shirt collar 17 inches (or 43 cm) or larger?
For females, is your shirt collar 16 inches (or 41 cm) or larger?
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8.
Gender
Is your gender male?
High risk group for sleep apnea: STOP-Bang score ≥ 3.
Low risk group for sleep apnea: STOP-Bang score < 3.
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Lim, H., Oh, M., Chung, Y.H. et al. Effects of continuous positive airway pressure in patients at high risk of obstructive sleep apnea during propofol sedation after spinal anesthesia. J Clin Monit Comput 33, 657–663 (2019). https://doi.org/10.1007/s10877-018-0202-8
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DOI: https://doi.org/10.1007/s10877-018-0202-8