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Wenyu Liang - One of the best experts on this subject based on the ideXlab platform.

  • re visiting the tympanic membrane vicinity as core Body Temperature Measurement site
    PLOS ONE, 2017
    Co-Authors: Wui Keat Yeoh, Wenyu Liang
    Abstract:

    Core Body Temperature (CBT) is an important and commonly used indicator of human health and endurance performance. A rise in baseline CBT can be attributed to an onset of flu, infection or even thermoregulatory failure when it becomes excessive. Sites which have been used for Measurement of CBT include the pulmonary artery, the esophagus, the rectum and the tympanic membrane. Among them, the tympanic membrane is an attractive Measurement site for CBT due to its unobtrusive nature and ease of Measurement facilitated, especially when continuous CBT Measurements are needed for monitoring such as during military, occupational and sporting settings. However, to-date, there are still polarizing views on the suitability of tympanic membrane as a CBT site. This paper will revisit a number of key unresolved issues in the literature and also presents, for the first time, a benchmark of the middle ear Temperature against Temperature Measurements from other sites. Results from experiments carried out on human and primate subjects will be presented to draw a fresh set of insights against the backdrop of hypotheses and controversies.

Paul Fulbrook - One of the best experts on this subject based on the ideXlab platform.

  • core Body Temperature Measurement a comparison of axilla tympanic membrane and pulmonary artery blood Temperature
    Intensive and Critical Care Nursing, 1997
    Co-Authors: Paul Fulbrook
    Abstract:

    This research study was undertaken to examine the relationship between pulmonary artery blood Temperature (regarded as the ‘gold standard’ Measurement for core Body Temperature), axilla Temperature using the Tempa.DOT Ax chemical thermometer and tympanic membrane Temperature using the Diatek 9000 Insta Temp thermometer. Sixty adult intensive care patients had their Temperatures monitored. A single set of five simultaneous Temperatures, i.e. left and right axilla, left and right tympanic membrane (TM), and pulmonary artery (PA) blood were recorded. The mean difference between left and right TM Temperatures was 0.58°C, and although both were moderately well correlated with PA Temperature ( r = 0.63 and 0.78, respectively) the mean differences between the two sites were clinically significant (0.85°C and 0.94°C, respectively). The range of differences between the sites was significant. Plotting limits of agreement showed that both left and right TM Temperatures may be up to 1.2°C above or 1.3°C below PA blood Temperature: a clinically unacceptable range. In particular, large Temperature differences were recorded when patients were lying with one side of their head to a pillow. Fan therapy directed to the head was not found to affect these differences significantly. The mean difference between left and right axilla Temperatures was 0.36°C, and although both were modestly correlated with PA Temperature ( r = 0.48 and 0.53, respectively) the mean differences between the two sites were clinically significant (0.47°C and 0.50°C, respectively). The range of differences between the sites was particularly significant. Plotting limits of agreement showed that both left and right axilla Temperatures may be up to 1.2°C above or 1.6°C below PA blood Temperature: a clinically unacceptable range. Because the range of Temperature differences found between PA blood and the other sites was so great, it is concluded that neither the chemical axilla thermometer nor the tympanic membrane thermometer used in this study are clinically reliable tools for adult intensive care patients.

Wui Keat Yeoh - One of the best experts on this subject based on the ideXlab platform.

  • re visiting the tympanic membrane vicinity as core Body Temperature Measurement site
    PLOS ONE, 2017
    Co-Authors: Wui Keat Yeoh, Wenyu Liang
    Abstract:

    Core Body Temperature (CBT) is an important and commonly used indicator of human health and endurance performance. A rise in baseline CBT can be attributed to an onset of flu, infection or even thermoregulatory failure when it becomes excessive. Sites which have been used for Measurement of CBT include the pulmonary artery, the esophagus, the rectum and the tympanic membrane. Among them, the tympanic membrane is an attractive Measurement site for CBT due to its unobtrusive nature and ease of Measurement facilitated, especially when continuous CBT Measurements are needed for monitoring such as during military, occupational and sporting settings. However, to-date, there are still polarizing views on the suitability of tympanic membrane as a CBT site. This paper will revisit a number of key unresolved issues in the literature and also presents, for the first time, a benchmark of the middle ear Temperature against Temperature Measurements from other sites. Results from experiments carried out on human and primate subjects will be presented to draw a fresh set of insights against the backdrop of hypotheses and controversies.

Wenxi Chen - One of the best experts on this subject based on the ideXlab platform.

  • A Wearable Thermometry for Core Body Temperature Measurement and Its Experimental Verification
    IEEE Journal of Biomedical and Health Informatics, 2017
    Co-Authors: Ming Huang, Wenxi Chen, Toshiyo Tamura, Zunyi Tang, Shigehiko Kanaya
    Abstract:

    A wearable thermometry for core Body Temperature (CBT) Measurement has both healthcare and clinical applications. On the basis of the mechanism of bioheat transfer, we earlier designed and improved a wearable thermometry using the dual-heat-flux method for CBT Measurement. In this study, this thermometry is examined experimentally. We studied a fast-changing CBT Measurement (FCCM, 55 min, 12 subjects) inside a thermostatic chamber and performed long-term monitoring of CBT (LTM, 24 h, six subjects). When compared with a reference, the CoreTemp CM-210 by Terumo, FCCM shows 0.07 °C average difference and a 95% CI of [-0.27, 0.12] °C. LTM shows no significant difference in parameters for the inference of circadian rhythm. The FCCM and LTM both simulated scenarios in which this thermometry could be used for intensive monitoring and daily healthcare, respectively. The results suggest that because of its convenient design, this thermometry may be an ideal choice for conventional CBT Measurements.

  • Improvement of the dual-heat-flux method for deep Body Temperature Measurement based on a finite element model
    2013 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), 2013
    Co-Authors: Ming Huang, Wenxi Chen, Kei-ichiro Kitamura, Tetsu Nemoto, Toshiyo Tamura
    Abstract:

    Based on finite element method, this study was dedicated to improve the performance of the newly proposed dual-heat-flux method (DHF) for noninvasive deep Body Temperature (DBT) Measurement. This study focused mainly on the dimensions, e.g., the height and radius, of the probe of DHF to improve its performance, in terms of the Measurement depth beneath the skin. This paper was also engaged in confirmation of the improved probe's performance on a physiological significant Temperature range, 35 to 40°C. The results showed that a probe with lower in height and larger in radius would have better performance. It suggests that we should reduce the height of the probe to half of the original and keep the radius unchanged for a better performance.

  • EMBC - Improvement of the dual-heat-flux method for deep Body Temperature Measurement based on a finite element model
    Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and, 2013
    Co-Authors: Ming Huang, Wenxi Chen, Kei-ichiro Kitamura, Tetsu Nemoto, Toshiyo Tamura
    Abstract:

    Based on finite element method, this study was dedicated to improve the performance of the newly proposed dual-heat-flux method (DHF) for noninvasive deep Body Temperature (DBT) Measurement. This study focused mainly on the dimensions, e.g., the height and radius, of the probe of DHF to improve its performance, in terms of the Measurement depth beneath the skin. This paper was also engaged in confirmation of the improved probe's performance on a physiological significant Temperature range, 35 to 40°C. The results showed that a probe with lower in height and larger in radius would have better performance. It suggests that we should reduce the height of the probe to half of the original and keep the radius unchanged for a better performance.

  • Theoretical study on the inverse modeling of deep Body Temperature Measurement.
    Physiological Measurement, 2012
    Co-Authors: Ming Huang, Wenxi Chen
    Abstract:

    We evaluated the theoretical aspects of monitoring the deep Body Temperature distribution with the inverse modeling method. A two-dimensional model was built based on anatomical structure to simulate the human abdomen. By integrating biophysical and physiological information, the deep Body Temperature distribution was estimated from cutaneous surface Temperature Measurements using an inverse quasilinear method. Simulations were conducted with and without the heat effect of blood perfusion in the muscle and skin layers. The results of the simulations showed consistently that the noise characteristics and arrangement of the Temperature sensors were the major factors affecting the accuracy of the inverse solution. With Temperature sensors of 0.05 ?C systematic error and an optimized 16-sensor arrangement, the inverse method could estimate the deep Body Temperature distribution with an average absolute error of less than 0.20 ?C. The results of this theoretical study suggest that it is possible to reconstruct the deep Body Temperature distribution with the inverse method and that this approach merits further investigation.

  • Inverse modeling for heat conduction problem in human abdominal phantom
    2011 Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2011
    Co-Authors: Ming Huang, Wenxi Chen
    Abstract:

    Noninvasive methods for deep Body Temperature Measurement are based on the principle of heat equilibrium between the thermal sensor and the target location theoretically. However, the Measurement position is not able to be definitely determined. In this study, a 2-dimensional mathematical model was built based upon some assumptions for the physiological condition of the human abdomen phantom. We evaluated the feasibility in estimating the internal organs Temperature distribution from the readings of the Temperature sensors arranged on the skin surface. It is a typical inverse heat conduction problem (IHCP), and is usually mathematically ill-posed. In this study, by integrating some physical and physiological a-priori information, we invoked the quasi-linear (QL) method to reconstruct the internal Temperature distribution. The solutions of this method were improved by increasing the accuracy of the sensors and adjusting their arrangement on the outer surface, and eventually reached the state of converging at the best state accurately. This study suggests that QL method is able to reconstruct the internal Temperature distribution in this phantom and might be worthy of a further study in an anatomical based model.

Stephen A Felt - One of the best experts on this subject based on the ideXlab platform.

  • comparison of rectal and tympanic core Body Temperature Measurement in adult guyanese squirrel monkeys saimiri sciureus sciureus
    Journal of Medical Primatology, 2011
    Co-Authors: Charles T Long, Cholawat Pacharinsak, Katechan Jampachaisri, Gabriel P Mckeon, Antwain M Howard, Megan A Albertelli, Stephen A Felt
    Abstract:

    Background  Measuring core Body Temperature in a manner that is safe for animals and veterinary personnel is an important part of a physical examination. For nonhuman primates, this can involve increased restraint, additional stress, as well as the use of anesthetics and their deleterious effects on Body Temperature Measurements. The purpose of this study was to compare two non-invasive methods of infrared tympanic thermometry to standard rectal thermometry in adult squirrel monkeys. Methods  Tympanic Temperatures were collected from 37 squirrel monkeys and compared to rectal Temperatures using a human and veterinary infrared tympanic thermometer. Results  Compared with rectal Temperature Measurements, the human tympanic thermometer readings were not significantly different, while the veterinary tympanic thermometer Measurements were significantly higher (P < 0.05). There were no differences between sexes. Conclusions  The tympanic thermometer designed for use in humans can be used in adult squirrel monkeys as an alternative to rectal thermometry for assessing core Body Temperature.

  • Comparison of rectal and tympanic core Body Temperature Measurement in adult Guyanese squirrel monkeys (Saimiri sciureus sciureus).
    Journal of Medical Primatology, 2010
    Co-Authors: Charles T Long, Cholawat Pacharinsak, Katechan Jampachaisri, Gabriel P Mckeon, Antwain M Howard, Megan A Albertelli, Stephen A Felt
    Abstract:

    Background  Measuring core Body Temperature in a manner that is safe for animals and veterinary personnel is an important part of a physical examination. For nonhuman primates, this can involve increased restraint, additional stress, as well as the use of anesthetics and their deleterious effects on Body Temperature Measurements. The purpose of this study was to compare two non-invasive methods of infrared tympanic thermometry to standard rectal thermometry in adult squirrel monkeys. Methods  Tympanic Temperatures were collected from 37 squirrel monkeys and compared to rectal Temperatures using a human and veterinary infrared tympanic thermometer. Results  Compared with rectal Temperature Measurements, the human tympanic thermometer readings were not significantly different, while the veterinary tympanic thermometer Measurements were significantly higher (P