Evaluation of Core Body Temperature When Using Forced Air Warming or an Active Blanket to Prevent Perioperative Hypothermia

Not Applicable

Completed

Conditions: Inadvertent Perioperative Hypothermia
Preoperative Anxiety Experienced by the Patient

Interventions: Device: Active self warming blanket
Device: Forced air warming device

Brief Summary: This investigation is undertaken to investigate if patient warming with BARRIER® EasyWarm active self-warming blanket differs compared to active warming with forced air warming in terms of core body temperature perioperatively.

A non-inferiority, prospective, open-labelled, randomized, parallel investigation.

Randomized subjects will receive active warming with BARRIER® EasyWarm or with forced air warming. All subjects may receive rescue warming if their core temperature falls below 35.5°C. Rescue warming is optional and defined as the institution's standard of care to prevent hypothermia.

The primary purpose is to investigate if there is a clinically relevant difference in core body temperature between the two treatment groups.

A total of 60 subjects will be included in the investigation, i.e. 30 subjects in each treatment group. The number includes a 30% drop-out rate.

Recruitment & Eligibility

Inclusion Criteria

Provision of informed consent i.e. subject must be able to understand and sign the Informed Consent Form (ICF)
Male and female subjects aged 18 years and over
Subject scheduled for surgery with a minimum length of 60 minutes and a maximum length of 120 minutes
Scheduled surgery must be performed entirely under general anaesthesia
The subject must be able to receive temperature assessments via an oesophageal temperature probe when under general anaesthesia and via an oral thermometer before and after general anaesthesia as well as in the pre- and post-op area
The subject must have an oral temperature measurement of at least 36.0°C when first measured in the preoperative setting
The subject's scheduled surgical procedure must allow time to be warmed with a fully activated BARRIER® EasyWarm at least 30 minutes prior to induction of general anaesthesia

Exclusion Criteria

Subjects with an American Society of Anesthesiologists (ASA) rating of 4 or greater
Known Diabetes with an HbA1c of more than 6 %
Relevant medical history (e.g., neuropathy, peripheral vascular disease, circulatory disorder or other) that presents risk to/of:
1. The subject's normal temperature regulation or
2. Perception of external temperature or
3. Subcutaneous lipoatrophy
Current use of concomitant medications that present relevant risk to/of:
1. The subject's normal temperature regulation or
2. Perception of external temperature or
3. Subcutaneous lipoatrophy
Epidural/Spinal anaesthesia
An oral temperature measurement ≥ 37.5°
Contraindications to the oesophagus temperature probe and oral thermometer
Presence of skin and soft tissue disorders in areas covered directly by the device in the two treatment groups (e.g. pressure ulcers, clinically significant psoriasis, dermatitis or any other interruption of skin integrity that would be affected by direct heat)
Pregnancy
Severe non-compliance to protocol as judged by the investigator and/or Mölnlycke Health Care

Arm && Interventions

Group	Intervention	Description
Active self-warming blanket	Active self warming blanket	Active warming with BARRIER® EasyWarm active self-warming blanket during the perioperative phase
Forced air warming device	Forced air warming device	Active warming with forced air warming (FAW) during the intraoperative phase.

Primary Outcome Measures

Name	Time	Method
The Difference in Core Body Temperature in the Two Treatment Groups.	Subjects will be followed for one day of hospital stay, data to be collected during the perioperative phase. Expected to be between 5-8 hours.	Temperature assessments will be made using an oesophageal temperature probe when the subject is under general anaesthesia and by oral thermometer for all other temperature assessments performed in pre-, intra- and post-op. The mean value is calculated on all temperature measured during pre-, intra- and post-op.

Secondary Outcome Measures

Name	Time	Method

Locations (3): Ullevål - Oslo Universitetssykehus
🇳🇴
Oslo, Norway
Universitätsklinikum Gießen und Marburg GmbH
🇩🇪
Marburg, Germany
Royal Hallamshire Hospital
🇬🇧
Sheffield, United Kingdom