Figure 5.

(A) Results from a device for electronically predicting pleural pressure from pulse wave signals before continuous positive airway pressure (CPAP) treatment. (B) Results from the device two months after CPAP treatment. For position, the green color means the supine position, and the red color means the left lateral decubitus position. For intraoral pressure, the blue color means the existence of obstructive sleep apnea. The yellow color in the area for SpO₂ means oxygen desaturation of 3% or more. The red color in the area for activity means activity detected by the body position sensor. The result for the predicted intrathoracic pressure is indicated by the closed arrow. bpm: beats per minute