Motamedi-Fakhr Shayan, Iles Richard, Barney Anna, de Boer Willem, Conlon Jenny, Khalid Amna, Wilson Rachel C
PneumaCare Ltd., Ely, UK
Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK.
Physiol Rep. 2017 Feb;5(3). doi: 10.14814/phy2.13124.
Structured light plethysmography (SLP) is a noncontact, noninvasive, respiratory measurement technique, which uses a structured pattern of light and two cameras to track displacement of the thoraco-abdominal wall during tidal breathing. The primary objective of this study was to examine agreement between tidal breathing parameters measured simultaneously for 45 sec using pneumotachography and SLP in a group of 20 participants with a range of respiratory patterns ("primary cohort"). To examine repeatability of the agreement, an additional 21 healthy subjects ("repeatability cohort") were measured twice during resting breathing and once during increased respiratory rate (RR). Breath-by-breath and averaged RR, inspiratory time (tI), expiratory time (tE), total breath time (tTot), tI/tE, tI/tTot, and IE50 (inspiratory to expiratory flow measured at 50% of tidal volume) were calculated. Bland-Altman plots were used to assess the agreement. In the primary cohort, breath-by-breath agreement for RR was ±1.44 breaths per minute (brpm). tI, tE, and tTot agreed to ±0.22, ±0.29, and ±0.32 sec, respectively, and tI/tE, tI/tTot, and IE50/IE50 to ±0.16, ±0.05, and ±0.55, respectively. When averaged, agreement for RR was ±0.19 brpm. tI, tE, and tTot were within ±0.16, ±0.16, and ±0.07 sec, respectively, and tI/tE, tI/tTot, and IE50 were within ±0.09, ±0.03, and ±0.25, respectively. A comparison of resting breathing demonstrated that breath-by-breath and averaged agreements for all seven parameters were repeatable ( > 0.05). With increased RR, agreement improved for tI, tE, and tTot ( ≤ 0.01), did not differ for tI/tE, tI/tTot, and IE50 ( > 0.05) and reduced for breath-by-breath ( < 0.05) but not averaged RR ( > 0.05).
结构光容积描记法（SLP）是一种非接触、非侵入性的呼吸测量技术，它使用结构化的光模式和两个摄像头来跟踪潮式呼吸过程中胸腹壁的位移。本研究的主要目的是在一组20名具有不同呼吸模式的参与者（“主要队列”）中，检验使用呼吸流速仪和SLP同时测量45秒潮式呼吸参数之间的一致性。为了检验一致性的可重复性，另外21名健康受试者（“可重复性队列”）在静息呼吸时测量了两次，在呼吸频率（RR）增加时测量了一次。逐次呼吸和平均的RR、吸气时间（tI）、呼气时间（tE）、总呼吸时间（tTot）、tI/tE、tI/tTot和IE50（在潮气量的50%处测量的吸气与呼气流量）被计算出来。使用Bland-Altman图来评估一致性。在主要队列中，RR的逐次呼吸一致性为每分钟±1.44次呼吸（brpm）。tI、tE和tTot的一致性分别为±0.22、±0.29和±0.32秒，tI/tE、tI/tTot和IE50的一致性分别为±0.16、±0.05和±0.55。平均时，RR的一致性为±0.19 brpm。tI、tE和tTot分别在±0.16、±0.16和±0.07秒内，tI/tE、tI/tTot和IE50分别在±0.09、±0.03和±0.25内。静息呼吸的比较表明，所有七个参数的逐次呼吸和平均一致性都是可重复的（P>0.05）。随着RR增加，tI、tE和tTot的一致性得到改善（P≤0.01），tI/tE、tI/tTot和IE50的一致性没有差异（P>0.05），逐次呼吸的一致性降低（P<0.05），但平均RR没有降低（P>0.05）。
