Optimal Positioning of Nasopharyngeal Temperature Probes: A Prospective Cohort Study

Study Overview
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Brief Summary
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Low body temperature (hypothermia) is often observed in anesthetized patients. Mild hypothermia increases complications such as surgical blood loss, postanesthesia recovery and the duration of hospitalization. To assess body temperature and minimize hypothermia-related complications, it is important to have accurate and reliable methods of measuring intraoperative core temperature. Common practice is to insert a nasopharyngeal (back of the throat from the nose) probe through one of the nostrils. However, there is no consensus or guideline regarding how deep the nasopharyngeal probe needs to be inserted. This study is being done to determine the insertion depth (or range of depths) that best approximates core temperature, which is temperature of the vital organs, e.g. heart, liver and lungs. Participation in the trial will occur on the day of surgery. The subject will be asked to breathe through one nostril and then the other before receiving anesthesia. The less congested nostril will be selected for study. If there is no difference, then the investigator will use the right nostril. Once under anesthesia, an esophageal temperature probe will be inserted to serve as a reference core temperature, which is used routinely in surgery. Then the nasopharyngeal probe will be inserted into the nostril. Both nasopharyngeal and esophageal temperatures will initially be recorded 45 minutes after anesthetic induction. The nasopharyngeal probe will then be withdrawn 2 cm and after a 3-minute equilibration period, nasopharyngeal and esophageal temperatures will again be recorded. The nasopharyngeal probe withdrawal sequence will be repeated, 2 cm at a time, until only 2 cm remains in the nostril. There will be a total of 10 sets of nasopharyngeal and esophageal temperatures obtained.

Official Title
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Optimal Positioning of Nasopharyngeal Temperature Probes: A Prospective Cohort Study

Conditions
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Hypothermia

Intervention / Treatment
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* Procedure: Nasopharyngeal


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: elective non-cardiac surgery scheduled to last at least 1.5 hours supine position anticipated general anesthesia with ETT Exclusion Criteria: nasopharyngeal disease (e.g. sinusitis), upper airway abnormalities, or planned surgery in the region history of recent substantive epistaxis history of bleeding disorders therapeutic-dose anti-coagulation (aspirin and DVT prophylaxis permitted) contraindications to esophageal temperature probe insertion (e.g. known varices)

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 90 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Other: nasopharyngeal<br>The nasopharyngeal probe will be inserted into the nostril. The nasopharyngeal temperature will initially be recorded 45 minutes after anesthetic induction. The nasopharyngeal probe will then be withdrawn 2 cm and after a 3-minute equilibration period, nasopharyngeal temperatures will again be recorded. The nasopharyngeal probe withdrawal sequence will be repeated, 2 cm at a time, until only 2 cm remains in the nostril. There will be a total of 10 sets of nasopharyngeal temperatures obtained. | Procedure: Nasopharyngeal<br> <br> |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| insertion depth of nasopharyngeal probe for core temperature |  | during surgery |