Clinician with patient in post-anaesthesia care unit


Why you should ask to be warmed

Did you know?

  • Ten people icons with three coloured in. Only 30% of patients are warmed during surgery²
  • Ten people icons with five coloured in. Over 50% of surgical patients experience perioperative hypothermia³

Perioperative hypothermia is easily preventable by active warming.

Surgical patients become hypothermic due to the effects of anesthesia, and flannel blankets just aren’t enough.

  • Gold 37°C standard ribbon icon

    = the body’s ideal thermal state

    Clinical hypothermia
    = core body temp less than 36°C

  • Person icon with arrows pointing out of the body with 1.6 written inside the body icon

    Patients can lose up to 1.6°C core temperature

    in the first 60 minutes of anaesthesia⁵

  • Three body icons showing the redistribution temperature drop

    Anaesthesia causes vasodilation,
    which allows blood to flow freely to the cooler periphery.

    As the blood circulates it cools, returning back to the heart causing core temperature to drop. This is called redistribution temperature drop (RTD).⁶

The benefits to maintaining a core temperature greater than 36°C include

  • Icon of bacteria under a magnifying glass

    Reduced rates of surgical site infection⁴,,¹¹

  • Icon of person in bed

    Increased patient comfort⁴

  • Icon of heartbeat

    Fewer morbid cardiac events⁴,¹⁰

  • Icon of blood bag on IV

    Reduction in the use of blood products⁴,

  • Icon of stopwatch

    Faster recovery time, shorter stay⁴,

The 3M solution

  • 3M™ Bair Hugger™ Temperature Monitoring System
    Monitor core temperature

    It is important that your core body temperature is monitored so your health care professional can respond quickly to help prevent and avoid complications.

    The 3M™ Bair Hugger™ Temperature Monitoring System offers an accurate, non-invasive, continuous method to easily measure core temperature throughout the perioperative process.

  • Young woman being prewarmed before surgery using 3M™ Bair Hugger™ Normothermia System
    Pre-warm with forced-air warming

    Perioperative hypothermia is easier to prevent than treat.

    Pre-induction warming with the 3M™ Bair Hugger™ Normothermia System banks heat in the patient’s periphery, which can help reduce the drop
    in temperature caused by the redistribution temperature drop.¹²

  • Warming blanket and Ranger™ System
    Maintain patient normothermia

    The 3M™ Bair Hugger™ Normothermia System includes a range of forced-air warming blankets and gowns, providing a reliable, effective solution to maintain normothermia during every stage of the surgical journey. 

    Infusion of cold fluids can reduce core temperature;⁴ warming intravenous fluids with the 3M™ Ranger™ Blood and Fluid Warming System helps prevent
    this drop.

Learn why you should be warmed during surgery


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1. Brauer, A. et al, Realities of perioperative hypothermia: time for action, consensus document from an expert working group. Dec 2016. Unpublished.
2. Torossian, A. Survey on intraoperative temperature management in Europe, European Journal of Anaesthesiology 2007; 24: 668–675.
3. Young, V. Watson, M. Prevention of Perioperative Hypothermia in Plastic Surgery. Aesthetic Surgery Journal. 2006; 551–571.
4. Sessler DI, Kurz A. Mild Perioperative Hypothermia. Anesthesiology News. October 2008: 17–28.
5. Sessler, DI. Perioperative Heat Balance. Anesth. 2000; 92: 578–596.
6. National Institute for Health and Clinical Excellence. Inadvertent perioperative hypothermia: The management of inadvertent perioperative hypothermia in adults [CG65], published April 2008.
7. Lenhardt R, Marker E, Goll V, et al. Mild intraoperative hypothermia prolongs postanesthetic recovery. Anesthesiology.1997 ;87 (6): 1318–1323.
8. Schmied H, Kurz A, Sessler DI, Kozek S, Reiter A. Mild hypothermia increases blood loss and transfusion requirements during total hip arthroplasty. Lancet. 1996;347(8997):289–92.
9. Kurz A, Sessler DI, Lenhardt R. Perioperative normothermia to reduce the incidence of surgical wound infection and shorten hospitalisation. N Engl J Med 1996; 334: 1209–15.
10. Frank SM. Consequences of hypothermia. Current Anaesth & Critical Care. 2001: 12: 79–86.
11. Melling AC, Ali B, Scott EM, Leaper DJ. The effects of pre-operative warming on the incidence of wound infection after clean surgery: a randomised controlled trial. Lancet 2001; 358: 882–886.
12. Horn, E.P, Bein, B et al (2012) The effects of short time periods of pre-operative warming in the prevention of peri-operative hypothermia. Anaesthesia, Vol. 67, pp. 612–617.