[Application of pressure of end-tidal carbon dioxide concentration in polysomnography].

Zhonghua er bi yan hou tou jing wai ke za zhi = Chinese journal of otorhinolaryngology head and neck surgery

PubMedID: 23710868

Chen WH, Ye JY, Zhang YH, Wang JY. [Application of pressure of end-tidal carbon dioxide concentration in polysomnography]. Zhonghua Er Bi Yan Hou Tou Jing Wai Ke Za Zhi. 2013;48(2):158-60.
OBJECTIVE
The purpose of this study was to investigate the end-tidal carbon dioxide concentration (PETCO2) monitoring coupling in polysomnography for patients with obstructive sleep apnea hypopnea syndrome (OSAHS) during sleep.

METHODS
PETCO2 was sampled through a Oral-Nasal Cannula and measured using micro-stream capnometer. Capnometer was calibrated according to the manufacturer instructions and integrated into the standard polysomnographic recordings. Thirty-eight consecutive patients underwent overnight polysomnography (PSG) were synchronously monitored PETCO2. All variables were recorded continuously and transferred to a computer for analysis.

RESULTS
PETCO2 numeric values and waveform were displayed in real time on the PSG epoch. The mean PETCO2 of wake, non-rapid eye movement, rapid eye movement and TST(?) were negatively correlated with apnea-hypopnea index and arousal index (r were -0.458 ~ -0.688, P < 0.01), were positively correlated with mean arterial oxygen saturation (SaO2) and lowest SaO2, (r were 0.604 ~ 0.674, P < 0.01).

CONCLUSIONS
The study provides preliminary data showing that PETCO2 potentially can be used in continuous monitoring of OSAHS patients. And PETCO2 can indicate the severity of OSAHS.