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Perioperative Accuracy of the Raiing Wireless Axillary Thermometer

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ClinicalTrials.gov Identifier: NCT02756910
Recruitment Status : Completed
First Posted : April 29, 2016
Results First Posted : May 14, 2021
Last Update Posted : May 14, 2021
The Cleveland Clinic
Information provided by (Responsible Party):
Lijian Pei, Peking Union Medical College Hospital

Brief Summary:

A new wireless axillary thermometer from Raiing Medical uses a proprietary system, iThermonitor (WT701), to provide better estimates of core temperature than a conventional axillary probe. Improvement results in part because the axillary probe measures and records temperatures continuously every 4 seconds and includes software to compensate for ambient temperature and positional changes including arm abduction.

Whether the iThermonitor is sufficiently accurate for clinical use remains unknown. The investigators thus propose to evaluate the system in perioperative patients who often experience thermal perturbations over a range of several °C. Specifically, the investigators propose to determine the precision and accuracy of iThermonitor in surgical patients and during the initial hour of recovery. As in previous studies, the investigators will consider the thermometer sufficiently accurate for clinical use if most Raiing temperatures are within ±0.5°C of the reference temperature.

Condition or disease Intervention/treatment
Major Surgery Under General Anesthesia Device: iThermonitor (WT701)

Detailed Description:

Patient characteristics, including age, height, weight, sex, and ASA status, and details of the surgery, including procedure and postoperative diagnosis will be recorded. The investigator will record the time of anesthesia induction and emergence. At 10-minute intervals during surgery, the investigator will record inspired volatile anesthetic concentration, mean-arterial pressure, type of thermal management device(s), and urine output over the previous 10-minute interval.

After induction of general anesthesia (without restriction as to type), the anesthesiologist will insert a temperature sensor into the distal esophagus. The distance will be determined by maximal heart sounds (if a stethoscope is used), or the probe will be inserted 0.48.(sitting height) - 4.4 cm. If an esophageal probe cannot be used, a thermometer can be inserted to between 10 and 20 cm into the nasopharynx. The surgical team will position a Foley catheter with temperature sensor into the urinary bladder. Ambient temperature will be recorded from an electronic probe situated at the height of the patients, well away from any heat-producing equipment.

Axillary temperature will be recorded by iThermonitor, a Raiing Medical wireless module, paired to an iPhone. An adhesive patch provided by Raiing will be used to securely position the Railing probe in a shaved axilla before the anesthesia induction. Patients will be asked to adduct the ipsilateral arm for up to 5 minutes after the probe is inserted, or until the temperature displayed on the paired iPhone is stable. Thereafter, patients will be free to move their arms.Monitored arm position during surgery will be recorded (arm tightly tucked, arm loose at side, arm abducted).

Temperatures will be recorded at 10-minute intervals during surgery and during the initial postoperative hour. Just before anesthetic emergence, the esophageal or nasopharyngeal thermometer will be removed, but the Foley catheter retained. The axillary device will then be removed after an hour of recovery, and the study concluded. The Foley catheter can be removed or retained per clinical need.

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Study Type : Observational
Actual Enrollment : 80 participants
Observational Model: Cohort
Time Perspective: Prospective
Official Title: Perioperative Accuracy of the Raiing Wireless Axillary Thermometer
Study Start Date : May 2016
Actual Primary Completion Date : September 2016
Actual Study Completion Date : September 2016

Group/Cohort Intervention/treatment
Surgery Patients >1.5 Hrs
Use esophageal catheter for core temperature monitoring, Foley catheter for bladder temperature monitoring, and iThermonitor (WT701) for axillary temperature monitoring
Device: iThermonitor (WT701)
Continuously monitor the axillary temperature during surgery

Primary Outcome Measures :
  1. Accuracy of iThermonitor in Surgical Patients [ Time Frame: From 1 to 3 hours after induction of anesthesia ]

    Accuracy, defined as the true difference between reference and iThermonitor temperature. The esophageal temperature will be the core temperature reference during surgery.

    The primary outcome measure is the proportion of iThermonitor measurements for a patient that are within 0.5° C of the reference will be calculated, and this proportion (median, quartiles, 95% CI) will be summarized across patients.

    The Secondary outcome measure are bias and 95% CIs determined by repeated-measures Bland-Altman analysis.

    For each patient the average difference between the iThermometer and the reference temperature will be calculated. Patient iThermonitor measurements will be regressed on patient reference measurements to assess the Pearson correlation and 95% CI between iThermonitor and reference and to estimate the bias (slope) of device versus reference.

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Ages Eligible for Study:   18 Years to 80 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population
Adult surgery patients

Inclusion Criteria:

  • adults having an American Society of Anesthesiologists (ASA) physical status of 1-3
  • must be scheduled for surgery of the abdomen or pelvis that is expected to last 1.5-4 hours
  • require general endotracheal anesthesia and insertion of a Foley catheter

Exclusion Criteria:

  • patients in whom neither esophageal nor nasopharyngeal temperature monitoring is practical
  • patients in whom active intravenous infusion is required in both arms
  • patients who are allergic to hydrogel

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT02756910

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Dept. of Anesthesiology, PUMCH
Beijing, China, 100730
Sponsors and Collaborators
Peking Union Medical College Hospital
The Cleveland Clinic
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Principal Investigator: Lijian Pei, MD Associate Prof. of Dept. of Anesthesiology, PUMCH
Study Chair: Yuguang Huang, MD Chair of Dept. of Anesthesiology, PUMCH
Study Director: Daniel I Sessler, MD Chair of Dept. of Outcomes Research, Anesthesiology Institute, Cleveland Clinic

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Responsible Party: Lijian Pei, Associate Professor, Peking Union Medical College Hospital
ClinicalTrials.gov Identifier: NCT02756910    
Other Study ID Numbers: HS-1019
First Posted: April 29, 2016    Key Record Dates
Results First Posted: May 14, 2021
Last Update Posted: May 14, 2021
Last Verified: February 2021
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No
Keywords provided by Lijian Pei, Peking Union Medical College Hospital:
open abdominal surgery
anesthesia, general