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Infra-red thermometry: the reliability of tympanic and temporal artery readings for predicting brain temperature after severe traumatic brain injury.

Kirk D, Rainey T, Vail A, Childs C - Crit Care (2009)

Bottom Line: Twenty patients aged 17-76 years were recruited.Tympanic membrane temperature differed from brain temperature by an average of 0.58 degrees C more than temporal artery temperature measurements (95% CI 0.31 degrees C to 0.85 degrees C, P < 0.0001).At temperatures within the normal to febrile range, temporal artery temperature is closer to brain temperature than is tympanic membrane temperature.

View Article: PubMed Central - HTML - PubMed

Affiliation: Brain Injury Research Group, School of Translational Medicine, University of Manchester, Salford Royal Foundation Trust, Stott Lane, Salford M6 8HD UK. dani_kirk@hotmail.com

ABSTRACT

Introduction: Temperature measurement is important during routine neurocritical care especially as differences between brain and systemic temperatures have been observed. The purpose of the study was to determine if infra-red temporal artery thermometry provides a better estimate of brain temperature than tympanic membrane temperature for patients with severe traumatic brain injury.

Methods: Brain parenchyma, tympanic membrane and temporal artery temperatures were recorded every 15-30 min for five hours during the first seven days after admission.

Results: Twenty patients aged 17-76 years were recruited. Brain and tympanic membrane temperature differences ranged from -0.8 degrees C to 2.5 degrees C (mean 0.9 degrees C). Brain and temporal artery temperature differences ranged from -0.7 degrees C to 1.5 degrees C (mean 0.3 degrees C). Tympanic membrane temperature differed from brain temperature by an average of 0.58 degrees C more than temporal artery temperature measurements (95% CI 0.31 degrees C to 0.85 degrees C, P < 0.0001).

Conclusions: At temperatures within the normal to febrile range, temporal artery temperature is closer to brain temperature than is tympanic membrane temperature.

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Temporal pattern of Tbr (boxes), Tt.a. (O) and tympanic membrane temperature (△) for patient R during 270 minutes of study. Tbr = brain temperature; Tt.a = temporal artery temperature.
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Figure 3: Temporal pattern of Tbr (boxes), Tt.a. (O) and tympanic membrane temperature (△) for patient R during 270 minutes of study. Tbr = brain temperature; Tt.a = temporal artery temperature.

Mentions: The absolute temperature difference between brain temperature and tympanic membrane temperature pairs and brain temperature and temporal artery temperature pairs for each patient studied is given in Figure 2. This graph shows which of the two body temperatures agrees most closely with brain temperature. If both of the measurement techniques (temporal artery and tympanic membrane readings) were in agreement with brain temperature it would be reasonable to expect that there should be no difference between the temporal artery thermometer reading and the tympanic membrane reading to determine brain temperature; therefore, the mean difference between the two pairs of temperature differences should be zero. Using a standard meta-analysis method to describe these data, the mean weighted difference between the two infra-red measurement techniques (using absolute temperature values and ignoring the sign) is 0.58°C (Figure 2). This implies that overall, tympanic membrane temperature differs, in either direction, from brain temperature by an average of 0.6°C (95% confidence interval (CI) = 0.31 to 0.85, P < 0.0001) more than temporal artery temperature does. Figure 3 shows a typical example of the temporal pattern of brain, tympanic membrane and temporal artery temperature for one patient (patient R; Figure 2).


Infra-red thermometry: the reliability of tympanic and temporal artery readings for predicting brain temperature after severe traumatic brain injury.

Kirk D, Rainey T, Vail A, Childs C - Crit Care (2009)

Temporal pattern of Tbr (boxes), Tt.a. (O) and tympanic membrane temperature (△) for patient R during 270 minutes of study. Tbr = brain temperature; Tt.a = temporal artery temperature.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2717446&req=5

Figure 3: Temporal pattern of Tbr (boxes), Tt.a. (O) and tympanic membrane temperature (△) for patient R during 270 minutes of study. Tbr = brain temperature; Tt.a = temporal artery temperature.
Mentions: The absolute temperature difference between brain temperature and tympanic membrane temperature pairs and brain temperature and temporal artery temperature pairs for each patient studied is given in Figure 2. This graph shows which of the two body temperatures agrees most closely with brain temperature. If both of the measurement techniques (temporal artery and tympanic membrane readings) were in agreement with brain temperature it would be reasonable to expect that there should be no difference between the temporal artery thermometer reading and the tympanic membrane reading to determine brain temperature; therefore, the mean difference between the two pairs of temperature differences should be zero. Using a standard meta-analysis method to describe these data, the mean weighted difference between the two infra-red measurement techniques (using absolute temperature values and ignoring the sign) is 0.58°C (Figure 2). This implies that overall, tympanic membrane temperature differs, in either direction, from brain temperature by an average of 0.6°C (95% confidence interval (CI) = 0.31 to 0.85, P < 0.0001) more than temporal artery temperature does. Figure 3 shows a typical example of the temporal pattern of brain, tympanic membrane and temporal artery temperature for one patient (patient R; Figure 2).

Bottom Line: Twenty patients aged 17-76 years were recruited.Tympanic membrane temperature differed from brain temperature by an average of 0.58 degrees C more than temporal artery temperature measurements (95% CI 0.31 degrees C to 0.85 degrees C, P < 0.0001).At temperatures within the normal to febrile range, temporal artery temperature is closer to brain temperature than is tympanic membrane temperature.

View Article: PubMed Central - HTML - PubMed

Affiliation: Brain Injury Research Group, School of Translational Medicine, University of Manchester, Salford Royal Foundation Trust, Stott Lane, Salford M6 8HD UK. dani_kirk@hotmail.com

ABSTRACT

Introduction: Temperature measurement is important during routine neurocritical care especially as differences between brain and systemic temperatures have been observed. The purpose of the study was to determine if infra-red temporal artery thermometry provides a better estimate of brain temperature than tympanic membrane temperature for patients with severe traumatic brain injury.

Methods: Brain parenchyma, tympanic membrane and temporal artery temperatures were recorded every 15-30 min for five hours during the first seven days after admission.

Results: Twenty patients aged 17-76 years were recruited. Brain and tympanic membrane temperature differences ranged from -0.8 degrees C to 2.5 degrees C (mean 0.9 degrees C). Brain and temporal artery temperature differences ranged from -0.7 degrees C to 1.5 degrees C (mean 0.3 degrees C). Tympanic membrane temperature differed from brain temperature by an average of 0.58 degrees C more than temporal artery temperature measurements (95% CI 0.31 degrees C to 0.85 degrees C, P < 0.0001).

Conclusions: At temperatures within the normal to febrile range, temporal artery temperature is closer to brain temperature than is tympanic membrane temperature.

Show MeSH
Related in: MedlinePlus