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Using craniofacial characteristics to predict optimum airway pressure in obstructive sleep apnea treatment.

INTRODUCTION: Manual titration is the gold standard to determinate optimal continuous positive airway pressure, and the prediction of the optimal pressure is important to avoid delays in prescribing a continuous positive airway pressure treatment.

OBJECTIVE: To verify whether anthropometric, polysomnographic, cephalometric, and upper airway clinical assessments can predict the optimal continuous positive airway pressure setting for obstructive sleep apnea patients.

METHODS: Fifty men between 25 and 65 years, with body mass indexes of less than or equal to 35kg/m2 were selected. All patients had baseline polysomnography followed by cephalometric and otolaryngological clinical assessments. On a second night, titration polysomnography was carried out to establish the optimal pressure.

RESULTS: The average age of the patients was 43±12.3 years, with a mean body mass index of 27.1±3.4kg/m2 and an apnea-hypopnea index of 17.8±10.5 events/h. Smaller mandibular length (p=0.03), smaller atlas-jaw distance (p=0.03), and the presence of a Mallampati III and IV (p=0.02) were predictors for higher continuous positive airway pressure. The formula for the optimal continuous positive airway pressure was: 17.244-(0.133×jaw length)+(0.969×Mallampati III and IV classification)-(0.926×atlas-jaw distance).

CONCLUSION: In a sample of male patients with mild-to-moderate obstructive sleep apnea, the optimal continuous positive airway pressure was predicted using the mandibular length, atlas-jaw distance and Mallampati classification.

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