Improvement of cerebral blood perfusion in certain cerebral regions after cranioplasty could be monitored via tympanic membrane temperature changes

Esophageal, rectal, tympanic, and central blood temperature, i.e., pulmonary artery and aortic arch, were recorded in three patients during iatrogenic whole-body hyperthermia for the treatment of advanced malignant metastatic cancer. Aortic temperature closely followed changes in pulmonary arterial temperature, with an average delay time of 27 s. Esophageal temperature reflected quantitatively and more quickly (avg lag time, 80 s) the temperature changes in the pulmonary artery than tympanic membrane temperature. Tympanic temperature was consistently lower than the blood temperature of the heart during steady state. Therefore it is suggested that esophageal temperature is a preferable index of central blood temperature. Additionally, measurement of esophageal temperature can be made more easily and safely than tympanic membrane temperature.

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Aural Thermometry during Profound Hypothermia

Anaesthesia and Intensive Care ◽

10.1177/0310057x8100900204 ◽

1981 ◽

Vol 9 (2) ◽

pp. 124-128 ◽

Cited By ~ 5

Author(s):

F. M. Davis ◽

P. K. Barnes ◽

J. S. Bailey

Keyword(s):

Tympanic Membrane ◽

Heart Surgery ◽

Brain Temperature ◽

Open Heart Surgery ◽

Profound Hypothermia ◽

Oesophageal Temperature ◽

Temperature Changes ◽

Tympanic Membrane Temperature ◽

Precise Relationship ◽

Otoscopic Examination

External auditory canal temperature changes during profound hypothermia were studied experimentally in ten dogs and clinically in 20 patients undergoing open-heart surgery. The results were compared with nasopharyngeal and lower oesophageal temperatures. Tympanic membrane temperature provided a better approximation to brain temperatures measured in four dogs to below 20°C than did either of the other two methods. In patients, auditory canal temperature showed less variability with respect to oesophageal temperature and fell at a faster rate than did nasopharyngeal temperature. It did not appear to be subject to positional or other artefacts but four patients showed evidence of auditory canal trauma. The precise relationship between auditory canal or tympanic membrane temperature and brain temperature during profound hypothermia is not established. Routine otoscopic examination should accompany the use of an ear probe.

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Does the Laminar Airflow System Affect the Development of Perioperative Hypothermia? A Randomized Clinical Trial

HERD Health Environments Research & Design Journal ◽

10.1177/1937586720985859 ◽

2021 ◽

pp. 193758672098585

Author(s):

Recai Dagli ◽

Fatma Çelik ◽

Hüseyin Özden ◽

Serdar Şahin

Keyword(s):

Clinical Trial ◽

Laparoscopic Cholecystectomy ◽

Tympanic Membrane ◽

Randomized Study ◽

Hvac Systems ◽

Anesthesia Induction ◽

Temperature Changes ◽

Perioperative Hypothermia ◽

Surgical Evaluation ◽

Turbulent Airflow

Objectives: We aimed to compare tympanic membrane temperature changes and the incidence of inadvertent perioperative hypothermia (IPH) in patients undergoing laparoscopic cholecystectomy under general anesthesia in laminar airflow systems (LAS-OR) and conventional turbulent airflow systems (CAS-OR). Background: Different heating, ventilation, and air-conditioning (HVAC) systems are used in the operating room (OR), such as LAS and CAS. Laminar airflow is directed directly to the patient in LAS-OR. Does laminar airflow in ORs cause faster heat loss by convection? Methods: This is a prospective, randomized study. We divided 200 patients with simple randomization (1:1), as group LAS and group CAS, and took the patients into the LAS-OR or CAS-OR for the operation. Clinical trial number: IRCT20180324039145N3. The tympanic membrane temperatures of patients were measured (°C) before anesthesia induction ( T 0) and then every 15 min during surgery ( Tn). Changes (Δ n) between T 0 and Tn were measured. Results: In the first 30 min, there was a temperature decrease of approximately 0.8 °C (1.44 °F) in both groups. Temperature decreases at 45 min were higher in group LAS than in group CAS but not statistically significant, Δ45, respectively, 0.89 (95% confidence interval [CI] [0.77, 1.02]) versus 0.77 (95% CI [0.69, 0.84]; p = .09). IPH occurred in a total of 60.9% (112 of 184) of patients in the entire surgical evaluation period in group LAS and group CAS (58.9% vs. 62.8%, p = . 59). Conclusions: IPH is seen frequently in both HVAC systems. Clinically, the advantage of HVAC systems relative to each other has not been demonstrated during laparoscopic cholecystectomy.

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Temperature Measurement

PEDIATRICS ◽

10.1542/peds.90.4.649b ◽

1992 ◽

Vol 90 (4) ◽

pp. 649-650

Author(s):

DAVID ALEXANDER ◽

THOMAS TERNDRUP

Keyword(s):

Temperature Measurement ◽

Tympanic Membrane ◽

Private Practice ◽

Temperature Measurements ◽

Practice Setting ◽

Pediatric Setting ◽

Tympanic Membrane Temperature ◽

Conventional Methods

To the Editor.— In the March 1992 issue of Pediatrics, Freed and Fraley published an article entitled, "Lack of Agreement of Tympanic Membrane Temperature Assessments with Conventional Methods in a Private Practice Setting."1 This study concluded that the FIRST Temp thermometer was unreliable, compared with conventional methods of temperature-taking in the private pediatric setting. I would like to raise two methodologic concerns which may have influenced their results. Under "Methods," the authors state that their tympanic thermometer provided a choice of two modes: "tympanic" and "surface," They further state that the tympanic mode was used for all temperature measurements.

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