Instituting preventive warming measures for patients who are normothermic. A variety of measures may be used, unless contraindicated.

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Transcription:

Patient Warmer Perioperative Hypothermia specifies that a preoperative patient management assessment should include: Identification of a patient s risk factors for unplanned perioperative hypothermia Measurement of patient temperature on admission Determining patient s thermal comfort level (ask the patients if they are cold) Assessment of other signs and symptoms of hypothermia (shivering, piloerection, and/or cold extremities) 3

Instituting preventive warming measures for patients who are normothermic. A variety of measures may be used, unless contraindicated. Passive insulation can include warmed blankets, socks, head covering, limited skin exposure, circulating water mattresses, and an increase in ambient temperature (a minimum of 20 C-24 C or 68 F-75 F) Instituting active warming measures for patients who are hypothermic. Active warming is the application of a forced-air convection warming system. Appropriate passive insulation may also be applied, as well as increased ambient room temperature. Warmed IV fluids may also be considered 4 During the intraoperative period, ASPAN recommends that a patient s temperature should be monitored.

Recommended warming methods Application of appropriate passive insulation, such as warm blankets, socks, head covering, limited skin exposure, and circulating water mattress Increasing ambient room temperature. AORN (Association of perioperative Registered Nurses) Practice Guidelines for ambient room temperature should be followed Institution of active warming: Apply forced-air warming system Warming IV and irrigation fluids Humidify and warm anesthetic gases

Inditherm patient warming mattress for the prevention of inadvertent hypothermia

2.5 million procedures per year involve anaesthetising for 30 minutes or longer. This anaesthesia carries a risk of inadvertent hypothermia 70% of patients undergoing routine surgery may be hypothermic on admission to the recovery room Active warming is associated with a reduction in surgical site infections of at least 25%

Inditherm mattress The Inditherm mattress has the following features: flexible, carbon-based conductive polymer technology moulds to the patient s shape low-voltage reusable control unit prevents overheating fabric: latex-free, nylon, non-microporous polyurethane coating Maintain patient core body temperature above 36 C The Inditherm mattress can be used on its own or with other warming methods

The Inditherm patient warming mattress should be considered for use in patients undergoing operations that carry a risk of inadvertent hypothermia

The layers of the Inditherm Patient warming mattress Retaining straps Sealed outer cover Flexible polymer heating surface Pressure relief pad :

No evidence of safety issues Quality of X-ray images is not affected by the Inditherm mattress The Inditherm mattress can be left on the operating table between patients Different mattress sizes available to suit different clinical situations Clean the Inditherm mattress the same way as a normal operating table mattress

2.5 million procedures per year involve anaesthetising for 30 minutes or longer. This anaesthesia carries a risk of inadvertent hypothermia 70% of patients undergoing routine surgery may be hypothermic on admission to the recovery room Active warming is associated with a reduction in surgical site infections of at least 25%

Inditherm mattress The Inditherm mattress has the following features: flexible, carbon-based conductive polymer technology moulds to the patient s shape low-voltage reusable control unit prevents overheating fabric: latex-free, nylon, non-microporous polyurethane coating Maintain patient core body temperature above 36 C The Inditherm mattress can be used on its own or with other warming methods

The Inditherm patient warming mattress should be considered for use in patients undergoing operations that carry a risk of inadvertent hypothermia

The layers of the Inditherm Patient warming mattress Retaining straps Sealed outer cover Flexible polymer heating surface Pressure relief pad :

No evidence of safety issues Quality of X-ray images is not affected by the Inditherm mattress The Inditherm mattress can be left on the operating table between patients Different mattress sizes available to suit different clinical situations Clean the Inditherm mattress the same way as a normal operating table mattress

WARMER

Warmer Importance of Warming Intravenous Fluids Conclusive evidence demonstrating the harmful effects of cold fluid infusion was provided by Boyan and Howland20 in 1961. In their study, infusion of 0.5 liter of cold blood reduced core temperature of anesthetized cancer patients by 0.5 to 1.0 C. When 3.0 liters or more of cold blood was administered, esophageal temperature decreased markedly and was associated with a high incidence of cardiac arrests (12 of 25 patients). When blood was warmed, the incidence of cardiac arrests in a matched group of patients with similar surgeries, blood loss, anesthesiologist, and surgeon was only 3 of 105 patients.

The theoretical impact of infusing fluids on body temperature can be calculated as follows: Change in body temperature = Thermal stress of infused fluids/ (Weight x Sp heat) where: Thermal stress = temperature difference between core and infused fluids x specific heat of infused fluid x volume of fluid infused Weight = weight of patient in kilograms Sp heat = specific heat of the patient (0.83 kcal/l/ C)23,24

Methods of warming These include immersing coiled IV tubing in a warm water bath microwaving the bag of fluid to be infused adding heated saline to blood to be infused passing the IV tubing through a heating block or through a plastic tube warmed with forced air passing the IV tubing through a conductive surface interfaced with a countercurrent heated water bath magnetic induction prewarming fluids in a convection oven or in a microwave oven, and inline microwaving.

Ideal fluid warmer- Characteristics The should be capable of safely delivering fluids and blood products at normothermia at both high and low flow rates. At high flows, the device should be able to detect air and automatically shut off to prevent accidental infusion of air. The ability of blood warmers to safely deliver normothermic fluids over a wide range of flows is limited by several factors, including limited heat-transfer capability of materials such as plastic limited surface area of the heat exchange mechanism inadequate heat transfer of the exchange mechanism at high flow rates, erythrocyte damage, heat loss after the IV tubing exits the warmer

Fluid Blanket Warmer for Operating Theatres These warmers are used to control the temperature of patient blankets and vital irrigating fluids used in surgery. Irrigation fluids play a vital role in most operations as a cleaning agent for wounds or open surgery and must be kept at a specific temperature to ensure shock does not occur.

REFERENCE Principles of Fluid and Blood Warming in Trauma By Charles E. Smith, and Karl Wagner, Vol. 18, No. 1, 2008 International TraumaCare (ITACCS)