Non-invasive zero-heat-flux technology compared with traditional core temperature measurements in the emergency department

Hart, Danielle; Rischall, Megan; Durgin, Kyle; Donoghue, Matthew; Pham, Thanh Thuy; Wyatt, Thomas; Stang, Jamie; DeVries, Paige A.

doi:10.1016/j.ajem.2020.08.071

Cited by 11 publications

(3 citation statements)

References 16 publications

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“…This is reflected in a mean error of +0.595 °C after 10 min in the ice bath and +0.598 °C after 20 min. The results of this study agree with previous research that question the accuracy of ZHF thermometers for snapshot measurement of core body temperature [ 35 ]. Furthermore, the 3M zero heat flux thermometer is the most expensive device used in this study, with a current price of CAD 1100.00.…”

Section: Discussionsupporting

confidence: 92%

Studying the Accuracy and Function of Different Thermometry Techniques for Measuring Body Temperature

Mah

Zadeh

Tehrani

et al. 2021

Biology

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The purpose of this study was to determine which thermometry technique is the most accurate for regular measurement of body temperature. We compared seven different commercially available thermometers with a gold standard medical-grade thermometer (Welch-Allyn): four digital infrared thermometers (Wellworks, Braun, Withings, MOBI), one digital sublingual thermometer (Braun), one zero heat flux thermometer (3M), and one infrared thermal imaging camera (FLIR One). Thirty young healthy adults participated in an experiment that altered core body temperature. After baseline measurements, participants placed their feet in a cold-water bath while consuming cold water for 30 min. Subsequently, feet were removed and covered with a blanket for 30 min. Throughout the session, temperature was recorded every 10 min with all devices. The Braun tympanic thermometer (left ear) had the best agreement with the gold standard (mean error: 0.044 °C). The FLIR One thermal imaging camera was the least accurate device (mean error: −0.522 °C). A sign test demonstrated that all thermometry devices were significantly different than the gold standard except for the Braun tympanic thermometer (left ear). Our study showed that not all temperature monitoring techniques are equal, and suggested that tympanic thermometers are the most accurate commercially available system for the regular measurement of body temperature.

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Section: Discussionsupporting

confidence: 92%

Studying the Accuracy and Function of Different Thermometry Techniques for Measuring Body Temperature

Mah

Zadeh

Tehrani

et al. 2021

Biology

View full text Add to dashboard Cite

show abstract

“…New methods, such as microwave and zero-heat-flux thermometers are being developed for non-invasive temperature measurement. However, they are still experimental and not yet suitable core temperature measurement in deep hypothermia (<28 °C) or in a cold environment [ 46 , 47 , 65 ]. In practice, a rough initial out-of-hospital estimate of core temperature can be made by touching the patient’s chest and by using the revised Swiss system.…”

Section: Diagnosis Of Hypothermiamentioning

confidence: 99%

Accidental Hypothermia: 2021 Update

Paal

Pasquier

Darocha

et al. 2022

IJERPH

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Accidental hypothermia is an unintentional drop of core temperature below 35 °C. Annually, thousands die of primary hypothermia and an unknown number die of secondary hypothermia worldwide. Hypothermia can be expected in emergency patients in the prehospital phase. Injured and intoxicated patients cool quickly even in subtropical regions. Preventive measures are important to avoid hypothermia or cooling in ill or injured patients. Diagnosis and assessment of the risk of cardiac arrest are based on clinical signs and core temperature measurement when available. Hypothermic patients with risk factors for imminent cardiac arrest (temperature < 30 °C in young and healthy patients and <32 °C in elderly persons, or patients with multiple comorbidities), ventricular dysrhythmias, or systolic blood pressure < 90 mmHg) and hypothermic patients who are already in cardiac arrest, should be transferred directly to an extracorporeal life support (ECLS) centre. If a hypothermic patient arrests, continuous cardiopulmonary resuscitation (CPR) should be performed. In hypothermic patients, the chances of survival and good neurological outcome are higher than for normothermic patients for witnessed, unwitnessed and asystolic cardiac arrest. Mechanical CPR devices should be used for prolonged rescue, if available. In severely hypothermic patients in cardiac arrest, if continuous or mechanical CPR is not possible, intermittent CPR should be used. Rewarming can be accomplished by passive and active techniques. Most often, passive and active external techniques are used. Only in patients with refractory hypothermia or cardiac arrest are internal rewarming techniques required. ECLS rewarming should be performed with extracorporeal membrane oxygenation (ECMO). A post-resuscitation care bundle should complement treatment.

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“…The measurement of body temperature is an effective way to observe heat stress in workers in hot environments. However, invasive methods such as rectal and oesophageal measurements are often impractical [ 20 , 21 ]. Humans need to dissipate excess heat generated by the body to maintain thermal equilibrium with their internal temperature maintained at approximately 37 °C.…”

Section: Methodsmentioning

confidence: 99%

Determination of Waste Management Workers’ Physical and Psychological Load: A Cross-Sectional Study Using Biometric Data

Kageyama

Hashiguchi

Cao

et al. 2022

IJERPH

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Waste management workers experience high stress and physical strain in their work environment, but very little empirical evidence supports effective health management practices for waste management workers. Hence, this study investigated the effects of worker characteristics and biometric indices on workers’ physical and psychological loads during waste-handling operations. A biometric measurement system was installed in an industrial waste management facility in Japan to understand the actual working conditions of 29 workers in the facility. It comprised sensing wear for data collection and biometric sensors to measure heart rate (HR) and physical activity (PA) based on electrocardiogram signals. Multiple regression analysis was performed to evaluate significant relationships between the parameters. Although stress level is indicated by the ratio of low frequency (LF) to high frequency (HF) or high LF power in HR, the results showed that compared with workers who did not handle waste, those who did had lower PA and body surface temperature, higher stress, and lower HR variability parameters associated with higher psychological load. There were no significant differences in HR, heart rate interval (RRI), and workload. The psychological load of workers dealing directly with waste was high, regardless of their PA, whereas others had a low psychological load even with high PA. These findings suggest the need to promote sustainable work relationships and a quantitative understanding of harsh working conditions to improve work quality and reduce health hazards.

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Non-invasive zero-heat-flux technology compared with traditional core temperature measurements in the emergency department

Cited by 11 publications

References 16 publications

Studying the Accuracy and Function of Different Thermometry Techniques for Measuring Body Temperature

Studying the Accuracy and Function of Different Thermometry Techniques for Measuring Body Temperature

Accidental Hypothermia: 2021 Update

Determination of Waste Management Workers’ Physical and Psychological Load: A Cross-Sectional Study Using Biometric Data

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