Higgs C M, Richardson R B, Lea D A, Lewis G T, Laszlo G
Thorax. 1986 Sep;41(9):671-5. doi: 10.1136/thx.41.9.671.
A portable peak flow meter based on a turbine transducer that can display results in code has been developed. Its performance compares well with the Wright peak flow meter. Records of subjective self assessment of asthma on a visual analogue scale and of peak flow (PEF) were compared in 12 subjects with asthma. PEF measurements were made with a coded meter for two weeks and an uncoded meter for two weeks in random order. The correlation between visual analogue scale score and PEF was invariably stronger when PEF was known. Changes in perception of asthma were measured by comparing the slopes and relative positions of the regressions of visual analogue on PEF. When PEF was uncoded awareness of asthma was significantly increased in five patients, predominantly those whose perception was poorest while they were using the coded meter, and decreased in only one patient. In two patients the results were unsuitable for this type of analysis. Knowledge of PEF therefore may influence subjective self assessment in patients with bronchial asthma. For objective studies of symptoms of asthma, PEF readings should be unknown to the patient. Perception of asthma may, however, be improved in patients with poor ability to detect changes in bronchial calibre by uncoded measurement of peak flow at home.
一种基于涡轮传感器的便携式峰值流量计已被研发出来，它能够以编码形式显示结果。其性能与赖特峰值流量计相当。在12名哮喘患者中，比较了视觉模拟量表上哮喘主观自我评估记录和峰值流量（PEF）记录。PEF测量分别使用编码流量计两周和未编码流量计两周，顺序随机。当患者知道PEF时，视觉模拟量表评分与PEF之间的相关性始终更强。通过比较视觉模拟量表对PEF回归的斜率和相对位置来测量哮喘感知的变化。当使用未编码流量计时，5名患者对哮喘的感知显著增加，主要是那些在使用编码流量计时感知最差的患者，而只有1名患者的感知下降。两名患者的结果不适合进行此类分析。因此，PEF的信息可能会影响支气管哮喘患者的主观自我评估。对于哮喘症状的客观研究，患者应不知道PEF读数。然而，对于在家中通过未编码测量峰值流量来检测支气管管径变化能力较差的患者，对哮喘的感知可能会得到改善。
