Author/Editor		Novak-Jankovič, V; Paver-Eržen, V; Fajdiga, I; Bovill, JG; Manohin, A; Žargi, M
Title		Estimation of arterial CO2 partial pressure by measurement of tracheal CO2 during high-frequency jet ventilation in patients with a laryngectomy
Type		članek
Source		Eur J Anaesthesiol
Vol. and No.		Letnik 15, št. 1
Publication year		1998
Volume		str. 1-5
Language		eng
Abstract		Tracheal and arterial CO2 partial pressures were meas-ured simultaneously in 27 laryngectomized patients both while they were awake and during high-frequency jet ventilation. Tracheal gas was sampled during brief interruptions of high-frequency jet ventilation. Agreement between tracheal and arterial C02 partial pressures was assessed using the Bland-Altman method. The tracheal-arterial CO2 partial pressures gradient during spontaneous breathing was significantly lower (P<0.0002) than during high-frequency jet ventilation. During spontaneous ventilation, the bias was - 0.77 kPa (95% CI = - 0.99 to -0.55 kPa), and the upper and lower limiits of agreement were 0.29 kPa (95% CI = - 0.11 to - 0.7 kPa) and -1.83 kPa (95% CI = --2.24 to -1.43 kPa). During high-frequency jet ventilation, the bias was -1.61 kPa (95% CI = -1.76 to -1.46 kPa), anci the limits of agreement were - 0.48kPa (95% CI = - 0.75 to - 0.21 kPa) and - 2.74 kPa (95% CI = - 3.01 to - 2.47 kPal. Despite the poor agreement between tracheal C02 partial pressure and arterial CO2 partial pressure, it is sufficient to allow for adjustment of ventilator settings durinq jet ventilation.
Descriptors		CARBON DIOXIDE HIGH-FREQUENCY JET VENTILATION LARYNGECTOMY TRACHEA ADULT MIDDLE AGE AGED BLOOD GAS ANALYSIS