Abstract
Liquid crystal thermometry (LCT) is a non-invasive alternative to temperature monitoring. We evaluated the ability of forehead LCT, rectal temperature, and axillary skin temperature to trend distal oesophageal temperature during rapid warming on cardiopulmonary bypass. In 24 patients undergoing open heart surgery, temperatures were measured during the rapid warming phase on bypass (12–35 min). Scattergrams of temperature vs time for the four temperature sites each contained 150 data points. Polynomial regression analysis revealed that LCT, but not axillary or rectal temperatures, correlated with oesophageal temperature. We conclude that forehead LCT may be useful to monitor temperature trends and to detect rapid elevations in body temperature when more invasive temperature monitoring is inappropriate or unavailable.
Résumé
La thermométrie à crystal liquide (LCT) est une alternative non-invasive pour surveiller la température corporelle. On a évalué durant la phase de rechauffement rapide lors d’une circulation extracorporelle, la capacité de la LCT mesurée au front, la température rectale, et la température cutanée axillaire, les comparant à la température œsophagienne distale. Chez 24 patients subissant une chirurgie cardiaque, les températures furent mesurées lors du réchauffement rapide par la CEC (12–35 minutes). Les courbes de dispersion de la température versus le temps pour les quatre sites de mesure de la température contenaient chacune 150 points de mesure. L’analyse de régression polynomiale a révélé que la LCT, mais non la température axillaire ou rectale, montrait une corrélation avec la température œsophagienne. On conclut que la mesure de la LCT au front peut être utile afin de mesurer la température et détecter une élévation rapide de la température corporelle quand d’autres moyens invasifs pour mesurer la température sont inappropriés ou non-disponibles.
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Allen, G.C., Horrow, J.C. & Rosenberg, H. Does forehead liquid crystal temperature accurately reflect “core” temperature?. Can J Anaesth 37, 659–662 (1990). https://doi.org/10.1007/BF03006486
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DOI: https://doi.org/10.1007/BF03006486