MEASUREMENT OF RESPIRATORY RATE AND TIMING USING A NASAL THERMOCOUPLE
MEASUREMENT OF RESPIRATORY RATE AND TIMING USING A NASAL THERMOCOUPLE
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DOI：
10.1007/bf01617716
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发表时间：
1995-05-01
期刊：
影响因子：
--
通讯作者：
CARTER, BG
中科院分区：
文献类型：
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作者：
MARKS, MK;SOUTH, M;CARTER, BG
目标。这项研究的目的是评估小型热电偶对温度变化的反应，并评估这种热电偶是否可以通过检测呼吸时鼻温的变化来间歇性地测量呼吸频率和时间。方法：研究方法。这项研究分为三个部分。首先，将三个类似的、反应迅速的热电偶反复浸泡在温水中。其次，研究了大气温度对放置在鼻孔内不同位置的热电偶信号的影响。使用笔记本电脑连续显示和分析产生的信号，以评估热电偶的响应特性。第三，在12名青少年受试者中，使用鼻腔热电偶和鼻腔血气测定仪同时采集呼吸记录。计算呼吸频率、吸气和呼气时间(Te)，并进行比较。结果，热电偶对呼吸和浸入水中的温度变化的反应迅速而一致。信号在标志信号峰值到期后的衰减率受大气温度的影响。热电偶的时间常数相似(平均时间常数=0.41s，标准差(SD)=0.07)。当热电偶放置在鼻孔内0~4 mm时，可获得最佳的呼吸记录，且最不不适。比较热电偶和呼吸机同时采集的呼吸记录，呼吸频率相同，Ti和Te值相似(平均差值分别为0.04秒(95%CI：-0.11~0.21秒)和-0.04秒(95%CI：-0.20~0.12秒))。结论。使用鼻腔热电偶对呼吸频率和时间的间歇性测量准确地反映了使用气压计从鼻腔气流中获得的测量结果。
Objective. The aims of this study were to assess aspects of the response of a small thermocouple to temperature change, and to evaluate whether such a thermocouple could be used intermittently to measure respiratory rate and timing by detecting the changes in nasal temperature occurring with breathing. Methods. The study had three parts. First, three similar, fast-responding thermocouples were immersed repeatedly in warm water. Second, the influence of atmospheric temperature on the signal of a thermocouple placed at different sites within the nasal orifice was studied. The signals produced were continuously displayed and analyzed using a laptop computer to allow evaluation of the thermocouples' response characteristics. Third, simultaneous respiratory recordings were acquired using a nasal thermocouple and a nasal pneumotachograph in 12 teenaged subjects. The respiratory rate and the periods of time taken for inspiration (Ti) and expiration (Te) were calculated and compared. Results, The thermocouples' responses to the temperature changes associated with breathing and immersion into water were rapid and consistent. The rate of the signals' decay, following the peak signal marking expiration, was influenced by the atmospheric temperature. The time constants of the thermocouples were similar (mean time constant = 0.41 sec, standard deviation (SD) = 0.07). Optimal respiratory recordings were obtained, with least discomfort, when the thermocouple was positioned at 0 to 4 mm within the nasal orifice. In comparing the respiratory recordings acquired simultaneously with a thermocouple and pneumotachograph, the respiratory rates were identical, and the Ti and Te values were similar (mean difference 0.04 sec (95% CI: -0.11 to 0.21 sec) and -0.04 sec (95% CI: - 0.20 to 0.12 sec), respectively). Conclusions. Intermittent measurements of respiratory rate and timing using a nasal thermocouple accurately reflected measurements obtained from nasal airflow using a pneumotachograph.