UNASSIGNED: Four integrated HFNC devices (AIRVO 2, Fisher & Paykel Healthcare, Auckland, New Zealand; TNI softFlow 50, TNI Medical AG, Würzburg, Germany; HUMID-BH, RESPIRACARE, Shenyang, China; OH-70C, Micomme, Hunan, China) and a ventilator with an HFNC module (bellavista 1000, Imtmedical, Buchs, Switzerland) were evaluated using their matching circuits. The dew point temperature was set at 31, 34, and 37°C (set-DP). In MR850, it was set to non-invasive mode (34°C/-3°C) and invasive mode (40°C/-3°C), respectively. At each level of set-DP, the flow was set from 20 L/min up to its maximum set limit at a gradient of 5 L/min or 10 L/min. After stabilization, the dew point temperature, temperature, relative humidity, and flow rate of the delivered gas from the cannulas were recorded.
UNASSIGNED: There were significant differences in actual-DP among these devices at any set-DP (p < 0.001). The actual-DP of OH-70C and TNI softFlow 50 was lower than set-DP, and the difference between the actual-DP and the set-DP of these two devices increased with the increase of set-DP. AIRVO 2, bellavista 1000 (MR850), and HUMID-BH can provide the nominal humidity at 37°C. The actual-DP increased with the increase of set-flow under each set-DP in AIRVO 2, TNI softFlow 50 and bellavista 1000 (MR850), but decreased when the set-flow was greater than 60 L/min. The actual-T of the delivered gas was higher than actual-DP in all devices and was higher than set-DP in AIRVO 2 and HUMID-BH.
UNASSIGNED: Set-flow, set-DP, and types of devices will affect the actual temperature and humidity of the delivered gas. AIRVO 2, bellavista 1000 (MR850), and HUMID-BH can provide the nominal humidity at 37°C and may be more suitable for tracheotomy patients. The flow rate over 60 L/min should be set with caution.
■四个集成HFNC设备(AIRVO2,Fisher&PaykelHealthcare,奥克兰,新西兰;TNIsoftFlow50,TNIMedicalAG,维尔茨堡,德国;HUMID-BH,呼吸道护理,沈阳,中国;OH-70C,Micomme,湖南,中国)和带有HFNC模块的呼吸机(bellavista1000,Imtmedical,Buchs,瑞士)使用其匹配电路进行了评估。露点温度设定在31、34和37°C(set-DP)。在MR850中,将其设置为非侵入式模式(34°C/-3°C)和侵入式模式(40°C/-3°C),分别。在每个级别的set-DP,在5L/min或10L/min的梯度下,流量设定为从20L/min直至其最大设定极限。稳定后,露点温度,温度,相对湿度,并且记录来自套管的输送气体的流速。
■在任何设置DP下,这些设备之间的实际DP存在显着差异(p<0.001)。OH-70C和TNIsoftFlow50的实际DP低于set-DP,并且这两个设备的实际DP和集合DP之间的差异随着集合DP的增加而增加。AIRVO2,贝拉维斯塔1000(MR850),和HUMID-BH可以提供37°C的标称湿度。实际DP随着AIRVO2、TNIsoftFlow50和bellavista1000(MR850)中每个set-DP下的set-flow的增加而增加,但当设定流量大于60L/min时下降。在所有设备中,输送气体的实际T高于实际DP,在AIRVO2和HUMID-BH中高于设定DP。
■设置流,set-DP,和设备类型将影响输送气体的实际温度和湿度。AIRVO2,贝拉维斯塔1000(MR850),和HUMID-BH可以提供37°C的标称湿度,可能更适合气管切开患者。流量超过60L/min应谨慎设定。