Jo Sion, Lee Jae Baek, Jin Youngho, Jeong Taeoh, Yoon Jaechol, Park Boyoung
Department of Emergency Medicine, Research Institute of Clinical Medicine of Chonbuk National University and Biomedical Research Institute of Chonbuk National University Hospital, Jeonju, Korea.
Department of Emergency Medicine, College of Medicine, Chonbuk National University, Jeonju, Korea.
Clin Exp Emerg Med. 2019 Mar;6(1):36-42. doi: 10.15441/ceem.18.006. Epub 2019 Mar 28.
The head-tilt/chin-lift (HT/CL) is a simple, routinely used maneuver to open the upper airway. Changes in the peak expiratory flow rate (PEFR) before and after the HT/CL maneuver have not been evaluated among conscious volunteers who are regarded as a control cohort.
Sixty healthy 20-year-old volunteers (30 males and 30 females) were enrolled. The supine position was defined as the position at which the ear-eye line was at a 10° angle to the horizontal. The HT/CL position was defined as the position at which the ear-eye line was at a 25° angle to the horizontal. PEFR was measured using a hand-held device with the subject in the supine position (pre-PEFR) and HT/CL position (post-PEFR), respectively. One set was defined as these two measurements. Five sets of measurements were performed on each subject (300 sets). The set with the maximal and minimal difference between pre-PEFR and post-PEFR were excluded from the analysis. We used a paired t-test to compare the mean pre-PEFR and post-PEFR values for the entire group and subgroups divided by sex, height, body weight, body mass index and response status.
Overall, 360 measurements (180 sets) were analyzed. The mean pre-PEFR and post-PEFR were 316.1±87.6 and 346.5±94.7 L/min, respectively. Further, significant differences were observed for sex, height, body weight, and body mass index. In 10 subjects, post-PEFR was lower than pre-PEFR.
PEFR increased by 9.6% after the HT/CL maneuver in young conscious subjects, but some subjects showed decreased PEFR after the HT/CL maneuver.
仰头提颏法（HT/CL）是一种用于开放上气道的简单常规操作方法。在作为对照队列的清醒志愿者中，尚未评估HT/CL操作前后呼气峰值流速（PEFR）的变化。
招募了60名20岁的健康志愿者（30名男性和30名女性）。仰卧位定义为耳眼线与水平面呈10°角的位置。HT/CL位定义为耳眼线与水平面呈25°角的位置。分别使用手持设备在受试者处于仰卧位（PEFR前）和HT/CL位（PEFR后）时测量PEFR。一组定义为这两次测量。对每个受试者进行五组测量（共300组）。分析时排除PEFR前和PEFR后差异最大和最小的那一组。我们使用配对t检验比较整个组以及按性别、身高、体重、体重指数和反应状态划分的亚组的PEFR前和PEFR后的平均值。
总体上，分析了360次测量（180组）。PEFR前和PEFR后的平均值分别为316.1±87.6和346.5±94.7升/分钟。此外，在性别、身高、体重和体重指数方面观察到显著差异。有10名受试者的PEFR后低于PEFR前。
在年轻清醒受试者中，HT/CL操作后PEFR增加了9.6%，但一些受试者在HT/CL操作后PEFR降低。
