Purpose

To develop an involuntary method to monitor heart rate and breath rhythm during sleep To explore applications in home healthcare domain, such as sleep apnea syndrome, sleep quality evaluation, sleep stage indexing, and sudden death monitoring

Method

Multi-resolution Wavelet - Dyadic wavelet, Experimental setup - Sensor unit was set beneath a pillow - Four signals were measured: - 1. Far-neck pressure - 2. Near-neck pressure - 3. Finger photoelectric plethysmogram as heart rate reference - 4. Nasal thermistor as breath rhythm reference

Result

Measurements - Four measured signals from upper to lower - 1. Far-neck pressure - 2. Near-neck pressure - 3. Finger photoelectric plethysmogram - 4. Nasal thermistor Detections - Wavelet reconstruction and characteristic point detection from upper to lower - 1. Near-neck pressure signal was used to detect heart rate and breath rhythm - 2. Finger photoelectric plethysmogram and detected points as heart rate reference - 3. Reconstructed D4+D5 singal and detected points - 4. Nasal thermistor and detected points as breath rhythm reference - 5. Reconstructed A6 singal and detected points

Further Info

Realtime monitoring of respiration rhythm and pulse rate during sleep - Xin Zhu, Wenxi Chen, Tetsu Nemoto, Yumi Kanemitsu, Keiichiro Kitamura, Kenichi Yamakoshi - IEEE Trans. BME, Vol.53, No.12, P2553-2563, 2006 Unconstrained detection of respiration rhythm and pulse rate with one under-pillow sensor during sleep - Wenxi Chen, Xin Zhu, Tetsu Nemoto, Yumi Kanemitsu, Keiichiro Kitamura, Kenichi Yamakoshi - Medical & Biological Engineering & Computing, Vol.43, No.2, P306-312, 2005