Surgical |

Active prewarming helps prevent perioperative hypothermia and its consequences

Within the first hour of anaesthesia delivery, a surgical patient can lose up to 1-1.5°C in core body temperature¹. Surgical patients who have not been given active patient pre-warming typically experience hypothermic effects as a result.

A photo of an operating room where a patient lies covered with the BARRIER EasyWarm blanket.

Even with active intraoperative warming, the initial drop in patients’ core body temperature typically happens in the first hour of surgery.  Active Patient pre-warming contributes to prevention of the temperature drop and helps reduce the risk of hypothermic consequences.

Perioperative hypothermia is a common but dangerous side effect of undergoing anaesthesia, and it can have negative effects, such as poorer clinical outcomes and associated costs. Intraoperative perioperative hypothermia (IPH) is an established risk factor for developing surgical site infections (SSIs). The clinical guidance on the management of IPH in adults reports that hypothermic patients have a four-times-higher risk of developing SSIs compared to normothermic patients2.

Risks of perioperative hypothermia

General anaesthesia is just one of the multiple aspects of surgery that impacts patients’ core body temperature, which can lead to hypothermia. Studies have shown that perioperative hypothermia can have significant negative impacts on patients, including impairing coagulation, drug metabolisation, and a three-fold increased risk of surgical wound infections3.

Other potential complications of perioperative hypothermia

Patients can also experience other complications including additional blood loss and increased pain scores as a result4. Furthermore, hypothermia delays wound healing and has been shown to prolong the patient’s length of stay in hospital by 20% – even in patients who do not suffer an infection, leading to hospital stays that are on average two days longer than necessary4. Therefore, not only is avoiding hypothermia critical to improving patient safety and infection prevention; it is also critical to ensuring efficient use of hospital resources. Any clinical measures that can be taken to reduce length of hospital stays and rates of surgical site infections will help to ease the current elective care backlog facing the health system.

Prevent the temperature drop

    1. Sessler DI, Kurz A. Mild perioperative hypothermia. Anesthesiology News [Internet]. 2008 Oct[cited 2013 Feb 12];34(10):17- 28.
    2. National Institute for Health and Clinical Excellence (GB). Inadvertent perioperative hypothermia: The management of inadvertent perioperative hypothermia in adults [CG65] [Internet]. [London]: National Institute for Health and Clinical Excellence (GB); 2008. [567 p.].
    3. Koc BB, Schotanus MGM, Kollenburg JP, Janssen MJ, Tijssen F, Jansen EJP 2017 Effectiveness of Early warming with Self-Warming Blankets on Postoperative Hypothermia in Total Hip and Knee Arthroplasty Orthopaedic Nursing 33(1) 356-360
    4. Sessler DI, Kurz A 2008 Mild Perioperative Hypothermia, https://www.anesthesiologynews.com/download/ANSE1008_Hypothermia_WM.pdf
    5. National Institution for Health and Care Excellence (NICE) 20018 Hypothermia: prevention and management in adults having surgery Available at: https://www.nice.org.uk/ guidance/cg65/resources/hypothermiaprevention-and-management-in-adults-havingsurgery-pdf-975569636293
    6. GIRFT National Survey April 2019 available at https://gettingitrightfirsttime.co.uk/wp-content/ uploads/2017/08/SSI-Report-GIRFT-APRIL19eFINAL.pdf
    7. Feinstein L, Miskiewicz M. Perioperative Hypothermia: Review for the Anesthesia Provider. The Internet Journal of Anesthesiology. 2010;27(2). DOI: 10.5580/1e49.
    8. Connor EL, Wren KR. Detrimental effects of hypothermia: a systems analysis. Journal of perianesthesia nursing: official journal of the American Society of PeriAnesthesia Nurses /American Society of PeriAnesthesia Nurses. 2000;15(3):151-5.
    9. Thapa HP, Kerton AJ, Peyton PJ. Comparison of the EasyWarm® self-heating blanket with the Cocoon forced-air warming blanket in preventing intraoperative hypothermia. Anaesthesia and Intensive Care. 2019;47(2):169-74.
    10. Brandes IF, Müller C, Perl T, Russo SG, Bauer M, Bräuer A. Efficacy of a novel warming blanket: Prospective randomized trial. Anaesthesist. 2013;62(2):137-42.