Wei Qiang, Qin Bingyu, He Guojun, Wu Yuanyuan, Shi Yuan, Sun Weitao, Jing Mengjuan, Zhu Shichao, Shao Huanzhang
Department of Central Intensive Care Unit, Henan Provincial People's Hospital, Zhengzhou 450003, Henan, China (Wei Q, Qin BY, Shi Y, Sun WT, Zhu SC, Shao HZ); Department of Intensive Care Unit, the First Affiliated Hospital of Zhejiang University, Hangzhou 310006, Zhejiang, China (He GJ); Reproductive Medicine Centre, the Third Affiliated Hospital, Zhengzhou University, Zhengzhou 450003, Henan, China (Wu YY); Department of Nursing, Henan Provincial People's Hospital, Zhengzhou 450003, Henan, China (Jing MJ). Corresponding author: Shao Huanzhang, Email:
Zhonghua Wei Zhong Bing Ji Jiu Yi Xue. 2018 Jul;30(7):677-680. doi: 10.3760/cma.j.issn.2095-4352.2018.07.012.
To verify the accuracy of oxygen concentration (FiO) of modified oxygen treatment with Venturi and humidity system.
Patients just after ventilator weaning and before the removal of tracheal intubation/tracheotomy tube, who admitted to the intensive care unit (ICU) of Henan Provincial People's Hospital from May 1st to December 15th in 2017, were enrolled. All patients were given a modified oxygen treatment with Venturi and humidity system, and the oxygen flow rate (Flow) of the Venturi device and the oretical value of FiO were adjusted according to the patient's condition. Patients were divided into five groups based on doctor's orders: Flow 3 L/min FiO 0.24, Flow 3 L/min FiO 0.26, Flow 6 L/min FiO 0.28, Flow 6 L/min FiO 0.30, Flow 9 L/min FiO 0.35. The value of FiO at the inhalation end of patients of each group was measured by TSI airflow analyzer, and the consistency between the measured value of FiO at the inhalation end and the FiO marked value of Venturi was compared and analyzed.
When the FiO theoretical value of Venturi were adjusted to 0.24, 0.26, 0.28, 0.30, and 0.35, the measured values of FiO at the inhalation end of patients were 0.38±0.05, 0.38±0.05, 0.40±0.04, 0.41±0.04, and 0.77±0.11, respectively, which were all significantly higher than the theoretical value of FiO (all P < 0.01). The difference between the measured value of FiO at the inhalation side and the FiO value of the Venturi annotated and the difference rate were both "V"-shaped, both of which decreased with the increase in theoretical value of FiO to a Flow of 9 L/min and a theoretical value of FiO 0.35, the accuracy was the worst, with the FiO difference of 0.42±0.11, and the FiO difference rate of (121.6±36.5)%.
There is a difference between the measured value and the theoretical value of FiO at the inhalation end of the modified Venturi oxygen therapy humidification system, which needs to be paid attention to during clinical oxygen therapy.
验证采用文丘里装置及湿化系统的改良吸氧治疗中氧浓度（FiO）的准确性。
纳入2017年5月1日至12月15日在河南省人民医院重症监护病房（ICU）的刚撤机且未拔除气管插管/气管切开管的患者。所有患者均接受采用文丘里装置及湿化系统的改良吸氧治疗，并根据患者情况调整文丘里装置的氧流量（Flow）及FiO的理论值。根据医嘱将患者分为五组：流量3L/min FiO 0.24、流量3L/min FiO 0.26、流量6L/min FiO 0.28、流量6L/min FiO 0.30、流量9L/min FiO 0.35。用TSI气流分析仪测量每组患者吸气端的FiO值，并比较分析吸气端FiO测量值与文丘里装置标注的FiO值之间的一致性。
当文丘里装置的FiO理论值分别调整为0.24、0.26、0.28、0.30和0.35时，患者吸气端的FiO测量值分别为0.38±0.05、0.38±0.05、0.40±0.04、0.41±0.04和0.77±0.11，均显著高于FiO理论值（均P<0.01）。吸气侧FiO测量值与文丘里装置标注的FiO值之差及差值率均呈“V”形，二者均随FiO理论值增大至流量9L/min且FiO理论值为0.35时下降，准确性最差，FiO差值为0.42±0.11，FiO差值率为(121.6±36.5)%。
改良文丘里吸氧治疗湿化系统吸气端FiO测量值与理论值存在差异，临床吸氧治疗时需予以关注。
