Abstract
Respiratory monitoring, using a novel flow sensor based on an acoustic principle, has been investigated in 30 patients during postoperative analgesia. Each patient was subjected to monitoring and human observation for 8 hr. The study was performed by independent observers at three clinics. Significant correlation was noted between respiratory rate (RR) determined by the sensor and the observers. Recordings of respiratory duration index (RDI), breathing time intervals (BTIs) indicated high sensitivity of the instrument to respiratory depression and perturbations in the breathing rhythm. More than 800 apnea alarms were noted, using an alarm setting of 30 sec; 61% of the categorized alarms were noted by the observers as true apneas. From the recordings it was shown that the number of alarms can be reduced by a factor of four if the alarm setting is changed to 45 sec. We conclude that the suggested technique, with slight modifications, provides adequate respiratory monitoring of patients during post-operative analgesia.
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Gustafsson LL, Schildt B, Jacobsen K. Adverse effects of extradural and intrathecal opiates; report of a nationwide survey in Sweden. Br J Anesth 1982;54:479
Vegfors M, Ugnell H, Hök B, et al. Experimental evaluation of two new sensors for respiratory rate. Physiol Meas 1993;14:171–181
Wiklund L, Hök B, Ståhl K, Jordeby-Jönsson A. Post-anesthesia monitoring revisited: Incidence of true and false alarms from different monitoring devices. J Clin Anesth 1994;6:182–188
Cyna AM, Kulkarni V, Tunstall ME, et al. AURA: A new respiratory monitor and apnoea alarm for spontaneously breathing patients. Br J Anesth 1991;67:341–345
Breathsensor (Product information). Eden Prairie, MN: Edentech Inc
Hök B, Wiklund L. A new respiratory rate monitor: Development and initial clinical experience. J Clin Monit 1993;10:101–107
Hök B. Microphone design for bioacoustic signals with suppression of noise and artifacts. Sensors Actuators 1991; A25–27:527–533
Shibutani K, Komatsu T, Ogawa T, et al. Monitoring of breathing intervals in narcotic sedation. Int J Clin Monit Comput 1991;8:159–162
Jense HG, Dubin SA, Silverstein PI, O'Leary-Escolas U. Effect of obesity on safe duration of apnea in anesthetized humans. Anesth Analg 1991;72:89–93
Severinghouse JW. Recent developments in pulse oximetry. Anesthesiology 1992;76:1018–1038
Jones JG. Ventilatory control during recovery from anesthesia. In: Hindmarch I, Jones JG, Moss E, eds. Aspects of recovery from anesthesia. New York: Wiley, 1987:37–43
Kurth CD, LeBard SE. Association of postoperative apnea, airway obstruction, and hypoxemia in former premature children. Anesthesiology 1991;75:22–26
Vegfors M, Lindberg LG, Pettersson H, Öberg PÅ. Presentation and evaluation of a new optical sensor for respiratory rate monitoring. Int J Clin Monit Comput (in press)
Lenz G, Heipertz W, Epple E. Capnometry for continuous postoperative monitoring of nonintubated, spontaneously breathing patients. J Clin Monit 1991;7:245–248
Gravelyn TR, Weg JG. Respiratory rate as an indicator of acute respiratory dysfunction. JAMA 1980;244:1123–1125
Application Manual: Pulse oximetry probes (Manual no 876475-5). Helsinki, Finland: Datex Instrumentarium Corporation, September 1990
Etches RC. Respiratory depression associated with patient-controlled analgesia: A review of eight cases. Can J Anaesth 1994;41:125–132
Baxter AD. Respiratory depression with patient-controlled analgesia (Editorial). Can J Anaesth 1994;41:87–90
Hines R, Barash PG, Watrous G, O'Connor T. Complications occurring in the postanesthesia care unit: A survey. Anesth Analg 1992;74:503–509
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Gordh, T., Rawal, N., Ström, S. et al. Respiratory monitoring during postoperative analgesia. J Clin Monitor Comput 11, 365–372 (1995). https://doi.org/10.1007/BF01616742
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DOI: https://doi.org/10.1007/BF01616742