A study in the September issue of the Journal of Clinical Sleep Medicine involved a one-month crossover trial of both continuous positive airway pressure (CPAP) therapy and oral appliance therapy for obstructive sleep apnea. Results show that a required CPAP pressure level of 13 cm H2O could be used as a cutoff to identify non-responders to oral appliance therapy. Multivariate regression identified CPAP pressure, age and apnea-hypopnea index as predictors of treatment response to an oral appliance.

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