Department of Pharmacy, Methodist University Hospital, Memphis, Tennessee, USA.
Respir Care. 2013 Mar;58(3):494-7. doi: 10.4187/respcare.01843.
Current guidelines for the correct peak expiratory flow (PEF) maneuver include standing. In the hospital setting, PEF values are often ordered to assess response to asthma therapy for exacerbations. We have observed that the PEF is sometimes performed with the patient in bed.
Healthy adults performed the PEF maneuver in random order, standing, lying back at an ~45° angle on pillows, and sitting, slumped forward ~10° with legs extended. PEF was recorded for 3 attempts in each of the 3 positions.
We enrolled 94 subjects (39 male, 55 female, mean age 24 y) in 2011. Mean PEF in the standing position (669 ± 42 L/min) was significantly higher than in the lying back (621 ± 42 L/min) (P < .001) and sitting (615 ± 42 L/min) positions in males (P < .001), and, similarly, in females, standing produced a significantly higher mean PEF (462 ± 42 L/min) than the lying back (422 ± 42 L/min) (P < .001) and sitting (447 ± 42 L/min) positions (P < .05).
Clinicians should ensure that PEF is obtained with patients out of bed and in the standing position.
目前正确的呼气峰流速（PEF）操作的指南包括站立位。在医院环境中，PEF 值通常用于评估哮喘急性发作时的治疗反应。我们发现有时患者在床上也会进行 PEF 检测。
健康成年人以随机顺序分别采取站立位、仰卧位（头高脚低约 45°）和前倾位（坐直，上身前倾约 10°，双腿伸展）进行 PEF 检测，每种体位重复 3 次。
2011 年我们共纳入了 94 名受试者（男性 39 名，女性 55 名，平均年龄 24 岁）。男性中，站立位时的平均 PEF（669±42L/min）显著高于仰卧位（621±42L/min）（P<.001）和前倾位（615±42L/min）（P<.001），女性中也呈现同样的趋势，站立位的平均 PEF（462±42L/min）显著高于仰卧位（422±42L/min）（P<.001）和前倾位（447±42L/min）（P<.05）。
临床医生应确保患者在离床并处于站立位时进行 PEF 检测。
