Fig. 5
From: Transient intracranial pressure elevations (B waves) are associated with sleep apnea
Patient with iNPH and SLEEP APNEA during NREM with frequent arousals and awakenings. The peak of the transient ICP elevation is seen when respiration resumes with a ventilatory overshoot, marked by increased flow and respiratory movements in the thorax and abdominal RIP. All transient ICP elevations in this example are seen with stable oxygen saturation. ICP is shown in blue, with red and purple indicating the duration of apneas and respiratory disturbances. Flow: nasal cannula registering flow changes (arbitrary units). RIP, respiratory inductance plethysmography; thorax and abdomen movements (arbitrary units). SaO2 (%), oxyhemoglobin saturation measured on the finger. Heart rate, beats/min. Hypnogram with awake and sleep stages