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Canadian Journal of Anesthesia, Vol 40, 375-381, Copyright © 1993 by Canadian Anesthesiologists' Society

ARTICLES

Liquid crystal skin thermometry: an accurate reflection of core temperature?

SJ Brull, AJ Cunningham, NR Connelly, TZ O'Connor and DG Silverman
Department of Anesthesiology, Yale University School of Medicine, Yale-New Haven Hospital, CT 06510.

Oesophageal, rectal, bladder, tympanic and pulmonary artery sites are used intraoperatively to measure body temperature. However, the temperatures measured at each site have different physiological and practical importance. The present two-part study sought to compare liquid crystal (CR) skin temperature with other temperature monitors which are used routinely during surgery. The first part compared CR with oesophageal (OS) temperature during general inhalational anaesthesia. The second part compared CR with OS, pulmonary artery (PA), and bladder (BL) temperatures during the periods of rapid temperature change associated with cardiopulmonary bypass (CPB). During the first part, the mean difference between OS and CR was -0.14 +/- 0.85 degrees C; this difference remained consistent over time (P < 0.05 by repeated measures analysis of variance). During the second part, the difference in temperature readings between CR and each of the other monitors remained consistent except for CR vs PA and CR vs OS during the cooling period of CPB, when the iced cardioplegia slush directly affected the PA and OS temperatures. This study suggests that CR, an inexpensive and noninvasive means of temperature monitoring, reflects trends in temperature changes in the clinical setting.


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Copyright © 1993 by the Canadian Anesthesiologists' Society.