Influence of low ambient temperature on epitympanic temperature measurement: a prospective randomized clinical study
Dal Cappello T
MetadataShow full item record
BACKGROUND: Epitympanic temperature (Tty) measured with thermistor probes correlates with core body temperature (Tcore), but the reliability of measurements at low ambient temperature is unknown. The aim of this study was to determine if commercially-available thermistor-based Tty reflects Tcore in low ambient temperature and if Tty is influenced by insulation of the ear. METHODS: Thirty-one participants (two females) were exposed to room (23.2 ± 0.4 °C) and low (-18.7 ± 1.0 °C) ambient temperature for 10 min using a randomized cross-over design. Tty was measured using an epitympanic probe (M1024233, GE Healthcare Finland Oy) and oesophageal temperature (Tes) with an oesophageal probe (M1024229, GE Healthcare Finland Oy) inserted into the lower third of the oesophagus. Ten participants wore ear protectors (Arton 2200, Emil Lux GmbH & Co. KG, Wermelskirchen, Switzerland) to insulate the ear from ambient air. RESULTS: During exposure to room temperature, mean Tty increased from 33.4 ± 1.5 to 34.2 ± 0.8 °C without insulation of the ear and from 35.0 ± 0.8 to 35.5 ± 0.7 °C with insulation. During exposure to low ambient temperature, mean Tty decreased from 32.4 ± 1.6 to 28.5 ± 2.0 °C without insulation and from 35.6 ± 0.6 to 35.2 ± 0.9 °C with insulation. The difference between Tty and Tes at low ambient temperature was reduced by 82% (from 7.2 to 1.3 °C) with insulation of the ear. CONCLUSIONS: Epitympanic temperature measurements are influenced by ambient temperature and deviate from Tes at room and low ambient temperature. Insulating the ear with ear protectors markedly reduced the difference between Tty and Tes and improved the stability of measurements. The use of models to correct Tty may be possible, but results should be validated in larger studies.
Showing items related by title, author, creator and subject.
Effects of temperature and temperature-humidity-index (THI) on the reproductive performance of sows during summer months under a moderate climate Wegner, K; Lambertz, C; Daş, G; Reiner, G; Gauly, M (Wiley: 12 months, 2014)Although the climate in Germany is moderate, heat stress conditions may occur during summer months. However, it is unknown to what extent sow fertility and piglet survival are affected under moderate climatic conditions ...
Experimental Investigation of a New Solid Wood Panel for Room Temperature Control: Analysis of the Cooling Performance Bishara, N; Plagge, R (EPFL, 2015)Wood industry’s current economic development shows an increase of selling multilayered solid wood panel products accompanied by a crescent functionalization of those panels. Within an industry driven project an additional ...
Thermal optimization and performance analysis of an innovative wooden radiant heating system made for room temperature control: Laboratory and numerical investigation of prototypes Bishara N; Schulz T; Gecks J; Plagge R; Wehsener J (2017)The development of an innovative radiant heating system, made for room temperature control, requiresextended laboratory and numerical analysis. The multilayered wooden structure design in particular isa challenging aspect ...