![]() ![]() ![]() Respiratory rate (RR) is one of the most important vital signs used to detect whether a patient is in critical condition. Intermittent measurements of respiratory rate and timing using a nasal thermocouple accurately reflected measurements obtained from nasal airflow using a pneumotachograph.Ĭamera-based measurement of respiratory rates is reliable.īecker, Christoph Achermann, Stefan Rocque, Mukul Kirenko, Ihor Schlack, Andreas Dreher-Hummel, Thomas Zumbrunn, Thomas Bingisser, Roland Nickel, Christian H 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). Optimal respiratory recordings were obtained, with least discomfort, when the thermocouple was positioned at 0 to 4 mm within the nasal orifice. The time constants of the thermocouples were similar (mean time constant = 0.41 sec, standard deviation (SD) = 0.07). The rate of the signals' decay, following the peak signal marking expiration, was influenced by the atmospheric temperature. The thermocouples' responses to the temperature changes associated with breathing and immersion into water were rapid and consistent. The respiratory rate and the periods of time taken for inspiration (Ti) and expiration (Te) were calculated and compared. Third, simultaneous respiratory recordings were acquired using a nasal thermocouple and a nasal pneumotachograph in 12 teenaged subjects. ![]() The signals produced were continuously displayed and analyzed using a laptop computer to allow evaluation of the thermocouples' response characteristics. Second, the influence of atmospheric temperature on the signal of a thermocouple placed at different sites within the nasal orifice was studied. First, three similar, fast-responding thermocouples were immersed repeatedly in warm water. ![]() 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. Measurement of respiratory rate and timing using a nasal thermocouple. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |