evaluation of core body temperature when using forced air warming or an active blanket to prevent perioperative hypothermia

Conditions: Inadvertent Perioperative Hypothermia; Preoperative Anxiety Experienced by the Patient

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.


Eligibility criteria:
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

Keywords: patient warming active warming forced air warming warming blanket