Figure 4From: Simultaneous sleep study and nasoendoscopic investigation in a patient with obstructive sleep apnoea syndrome refractory to continuous positive airway pressure: a case report A home nocturnal oximetry (in bilevel mode) with nasal mask. (Evaluation at 5 months). A home nocturnal oximetry (in bilevel mode, inspiratory pressure of 20 cmH2O and expiratory pressure of 12 cmH2O, and a gel face mask (Mojo) shows episodes of desaturation suggesting a large number of residual apnoea and/or hypopnoea events.Back to article page