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class="bkr_bib"><h1 id="_NBK554181_"><span itemprop="name">Hypothermia: prevention and management in adults having surgery</span></h1><p><i>NICE Clinical Guidelines, No. 65</i></p><div class="half_rhythm">London: <a href="http://www.nice.org.uk/" ref="pagearea=meta&targetsite=external&targetcat=link&targettype=publisher"><span itemprop="publisher">National Institute for Health and Care Excellence (NICE)</span></a>; <span itemprop="datePublished">2016 Dec</span>.<div class="small">ISBN-13: <span itemprop="isbn">978-1-4731-2214-7</span></div></div><div><a href="/books/about/copyright/">Copyright</a> © NICE 2019.</div></div><div class="bkr_clear"></div></div><div id="cha.box1" class="box boxed-text-box whole_rhythm hide-overflow"><p>This guideline is the basis of QS49.</p></div><div id="cha.s1"><h2 id="_cha_s1_">Recommendations</h2><div id="cha.box2" class="box boxed-text-box whole_rhythm hide-overflow"><p>People have the right to be involved in discussions and make informed decisions about their care, as described in <a href="http://www.nice.org.uk/about/nice-communities/public-involvement/your-care" ref="pagearea=body&targetsite=external&targetcat=link&targettype=uri">your care</a>.</p><p><a href="http://www.nice.org.uk/about/what-we-do/our-programmes/nice-guidance/nice-guidelines/using-NICE-guidelines-to-make-decisions" ref="pagearea=body&targetsite=external&targetcat=link&targettype=uri">Making decisions using NICE guidelines</a> explains how we use words to show the strength (or certainty) of our recommendations, and has information about prescribing medicines (including off-label use), professional guidelines, standards and laws (including on consent and mental capacity), and safeguarding.</p></div><div id="cha.s1.1"><h3>1.1. Perioperative care</h3><dl id="cha.l1" class="temp-labeled-list"><dl class="bkr_refwrap"><dt>1.1.1.</dt><dd id="cha.lt1"><p class="no_top_margin">Patients (and their families and carers) should be informed that:
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<ul id="cha.l2"><li id="cha.lt2" class="half_rhythm"><div>staying warm before surgery will lower the risk of postoperative complications</div></li><li id="cha.lt3" class="half_rhythm"><div>the hospital environment may be colder than their own home</div></li><li id="cha.lt4" class="half_rhythm"><div>they should bring additional clothing, such as a dressing gown, a vest, warm clothing and slippers, to help them keep <a href="#abb_DL1_DI2">comfortably warm</a></div></li><li id="cha.lt5" class="half_rhythm"><div>they should tell staff if they feel cold at any time during their hospital stay. <b>[2008]</b></div></li></ul></p></dd></dl><dl class="bkr_refwrap"><dt>1.1.2.</dt><dd id="cha.lt6"><p class="no_top_margin">Pay particular attention to the comfort of patients with communication difficulties before, during and after surgery. <b>[new 2016]</b></p></dd></dl><dl class="bkr_refwrap"><dt>1.1.3.</dt><dd id="cha.lt7"><p class="no_top_margin">When using any <a href="#abb_DL1_DI5">temperature</a> recording or warming device, healthcare professionals should:
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<ul id="cha.l3"><li id="cha.lt8" class="half_rhythm"><div>be trained in their use</div></li><li id="cha.lt9" class="half_rhythm"><div>maintain them in accordance with manufacturers’ and suppliers’ instructions</div></li><li id="cha.lt10" class="half_rhythm"><div>comply with local infection control policies. <b>[2008]</b></div></li></ul></p></dd></dl><dl class="bkr_refwrap"><dt>1.1.4.</dt><dd id="cha.lt11"><p class="no_top_margin">When using any device to measure patient temperature, healthcare professionals should:
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<ul id="cha.l4"><li id="cha.lt12" class="half_rhythm"><div>be aware of, and carry out, any adjustments that need to be made in order to obtain an estimate of <a href="#abb_DL1_DI3">core temperature</a><sup><a href="#cha.fn1">[1]</a></sup> from that recorded at the site of measurement</div></li><li id="cha.lt13" class="half_rhythm"><div>be aware of any such adjustments that are made automatically by the device used. <b>[2008]</b></div></li></ul></p></dd></dl><dl class="bkr_refwrap"><dt>1.1.5.</dt><dd id="cha.lt14"><p class="no_top_margin">Measure the patient’s temperature using a site that produces either:
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<ul id="cha.l5"><li id="cha.lt15" class="half_rhythm"><div>a direct measurement of core temperature, or</div></li><li id="cha.lt16" class="half_rhythm"><div>a direct estimate<sup><a href="#cha.fn2">[2]</a></sup> of core temperature that has been shown in research studies to be accurate to within 0.5°C of direct measurement.</div></li></ul>
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<blockquote><p>At the time of publication these sites are:
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<dl id="cha.l6" class="temp-labeled-list"><dl class="bkr_refwrap"><dt>–</dt><dd id="cha.lt17"><p class="no_top_margin">pulmonary artery catheter</p></dd></dl><dl class="bkr_refwrap"><dt>–</dt><dd id="cha.lt18"><p class="no_top_margin">distal oesophagus</p></dd></dl><dl class="bkr_refwrap"><dt>–</dt><dd id="cha.lt19"><p class="no_top_margin">urinary bladder</p></dd></dl><dl class="bkr_refwrap"><dt>–</dt><dd id="cha.lt20"><p class="no_top_margin">zero heat-flux (deep forehead)</p></dd></dl><dl class="bkr_refwrap"><dt>–</dt><dd id="cha.lt21"><p class="no_top_margin">sublingual<sup><a href="#cha.fn3">[3]</a></sup></p></dd></dl><dl class="bkr_refwrap"><dt>–</dt><dd id="cha.lt22"><p class="no_top_margin">axilla<sup><a href="#cha.fn3">[3]</a></sup></p></dd></dl><dl class="bkr_refwrap"><dt>–</dt><dd id="cha.lt23"><p class="no_top_margin">rectum. [new 2016]</p></dd></dl></dl></p></blockquote></p></dd></dl><dl class="bkr_refwrap"><dt>1.1.6.</dt><dd id="cha.lt24"><p class="no_top_margin">Do not use indirect estimates<sup><a href="#cha.fn4">[4]</a></sup> of core temperature in adults having surgery. <b>[new 2016]</b></p></dd></dl></dl></div><div id="cha.s1.2"><h3>1.2. Preoperative phase</h3><p>The preoperative phase is defined as the hour before induction of anaesthesia, during which the patient is prepared for surgery on the ward or in the emergency department, including possible use of premedication.</p><dl id="cha.l7" class="temp-labeled-list"><dl class="bkr_refwrap"><dt>1.2.1.</dt><dd id="cha.lt25"><p class="no_top_margin">Each patient should be assessed for their risk of inadvertent perioperative <a href="#abb_DL1_DI4">hypothermia</a> and potential adverse consequences before transfer to the theatre suite. Patients should be managed as higher risk (see <a href="#cha.lt48">recommendation 1.3.7</a>) if any 2 of the following apply:
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<ul id="cha.l8"><li id="cha.lt26" class="half_rhythm"><div>American Society of Anesthesiologists (ASA) grade II to V (the higher the grade, the greater the risk)</div></li><li id="cha.lt27" class="half_rhythm"><div>preoperative <a href="#abb_DL1_DI5">temperature</a> below 36.0°C (and preoperative warming is not possible because of clinical urgency)</div></li><li id="cha.lt28" class="half_rhythm"><div>undergoing combined general and regional anaesthesia</div></li><li id="cha.lt29" class="half_rhythm"><div>undergoing major or intermediate surgery</div></li><li id="cha.lt30" class="half_rhythm"><div>at risk of cardiovascular complications. <b>[2008]</b></div></li></ul></p></dd></dl><dl class="bkr_refwrap"><dt>1.2.2.</dt><dd id="cha.lt31"><p class="no_top_margin">The patient’s temperature should be measured and documented in the hour before they leave the ward or emergency department. <b>[2008]</b></p></dd></dl><dl class="bkr_refwrap"><dt>1.2.3.</dt><dd id="cha.lt32"><p class="no_top_margin">If the patient’s temperature is below 36.0°C, start <a href="#abb_DL1_DI1">active warming</a> preoperatively on the ward or in the emergency department (unless there is a need to expedite surgery because of clinical urgency, for example bleeding or critical limb ischaemia). <b>[2008, amended 2016]</b></p></dd></dl><dl class="bkr_refwrap"><dt>1.2.4.</dt><dd id="cha.lt33"><p class="no_top_margin">If the patient’s temperature is 36.0°C or above, start active warming at least 30 minutes before induction of anaesthesia, unless this will delay emergency surgery. <b>[new 2016]</b></p></dd></dl><dl class="bkr_refwrap"><dt>1.2.5.</dt><dd id="cha.lt34"><p class="no_top_margin">Maintain active warming throughout the intraoperative phase. <b>[2008, amended 2016]</b></p></dd></dl><dl class="bkr_refwrap"><dt>1.2.6.</dt><dd id="cha.lt35"><p class="no_top_margin">The patient’s temperature should be 36.0°C or above before they are transferred from the ward or emergency department (unless there is a need to expedite surgery because of clinical urgency, for example bleeding or critical limb ischaemia). <b>[2008]</b></p></dd></dl><dl class="bkr_refwrap"><dt>1.2.7.</dt><dd id="cha.lt36"><p class="no_top_margin">On transfer to the theatre suite:
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<ul id="cha.l9"><li id="cha.lt37" class="half_rhythm"><div>active warming should be continued (or re-started as soon as possible)</div></li><li id="cha.lt38" class="half_rhythm"><div>the patient should be encouraged to walk to theatre where appropriate. <b>[2008, amended 2016]</b></div></li></ul></p></dd></dl></dl></div><div id="cha.s1.3"><h3>1.3. Intraoperative phase</h3><p>The intraoperative phase is defined as total anaesthesia time, from the first anaesthetic intervention through to patient transfer to the recovery area of the theatre suite.</p><dl id="cha.l10" class="temp-labeled-list"><dl class="bkr_refwrap"><dt>1.3.1.</dt><dd id="cha.lt39"><p class="no_top_margin">The patient’s <a href="#abb_DL1_DI5">temperature</a> should be measured and documented before induction of anaesthesia and then every 30 minutes until the end of surgery. <b>[2008]</b></p></dd></dl><dl class="bkr_refwrap"><dt>1.3.2.</dt><dd id="cha.lt40"><p class="no_top_margin">Standard critical incident reporting should be considered for any patient arriving at the theatre suite with a temperature below 36.0°C. <b>[2008]</b></p></dd></dl><dl class="bkr_refwrap"><dt>1.3.3.</dt><dd id="cha.lt41"><p class="no_top_margin">Induction of anaesthesia should not begin unless the patient’s temperature is 36.0°C or above (unless there is a need to expedite surgery because of clinical urgency, for example bleeding or critical limb ischaemia). <b>[2008]</b></p></dd></dl><dl class="bkr_refwrap"><dt>1.3.4.</dt><dd id="cha.lt42"><p class="no_top_margin">In the theatre suite:
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<ul id="cha.l11"><li id="cha.lt43" class="half_rhythm"><div>the ambient temperature should be at least 21°C while the patient is exposed</div></li><li id="cha.lt44" class="half_rhythm"><div>once <a href="#abb_DL1_DI1">active warming</a> is established, the ambient temperature may be reduced to allow better working conditions</div></li><li id="cha.lt45" class="half_rhythm"><div>using equipment to cool the surgical team should also be considered. <b>[2008, amended 2016]</b></div></li></ul></p></dd></dl><dl class="bkr_refwrap"><dt>1.3.5.</dt><dd id="cha.lt46"><p class="no_top_margin">The patient should be adequately covered throughout the intraoperative phase to conserve heat, and exposed only during surgical preparation. <b>[2008]</b></p></dd></dl><dl class="bkr_refwrap"><dt>1.3.6.</dt><dd id="cha.lt47"><p class="no_top_margin">Intravenous fluids (500 ml or more) and blood products should be warmed to 37°C using a fluid warming device. <b>[2008]</b></p></dd></dl><dl class="bkr_refwrap"><dt>1.3.7.</dt><dd id="cha.lt48"><p class="no_top_margin">Warm patients intraoperatively from induction of anaesthesia, using a forced-air warming device, if they are:
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<ul id="cha.l12"><li id="cha.lt49" class="half_rhythm"><div>having anaesthesia for more than 30 minutes or</div></li><li id="cha.lt50" class="half_rhythm"><div>having anaesthesia for less than 30 minutes and are at higher risk of inadvertent perioperative hypothermia (see <a href="#cha.lt25">recommendation 1.2.1</a>).</div></li><li id="cha.lt51" class="half_rhythm"><div>Consider a resistive heating mattress or resistive heating blanket if a forced-air warming device is unsuitable. <b>[new 2016]</b></div></li></ul></p></dd></dl><dl class="bkr_refwrap"><dt>1.3.8.</dt><dd id="cha.lt52"><p class="no_top_margin">The temperature setting on forced-air warming devices should be set at maximum and then adjusted to maintain a patient temperature of at least 36.5°C. <b>[2008]</b></p></dd></dl><dl class="bkr_refwrap"><dt>1.3.9.</dt><dd id="cha.lt53"><p class="no_top_margin">All irrigation fluids used intraoperatively should be warmed in a thermostatically controlled cabinet to a temperature of 38°C to 40°C. <b>[2008]</b></p></dd></dl></dl></div><div id="cha.s1.4"><h3>1.4. Postoperative phase</h3><p>The postoperative phase is defined as the 24 hours after the patient has entered the recovery area of the theatre suite.</p><dl id="cha.l13" class="temp-labeled-list"><dl class="bkr_refwrap"><dt>1.4.1.</dt><dd id="cha.lt54"><p class="no_top_margin">The patient’s <a href="#abb_DL1_DI5">temperature</a> should be measured and documented on admission to the recovery room and then every 15 minutes.
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<ul id="cha.l14"><li id="cha.lt55" class="half_rhythm"><div>Ward transfer should not be arranged unless the patient’s temperature is 36.0°C or above.</div></li><li id="cha.lt56" class="half_rhythm"><div>If the patient’s temperature is below 36.0°C, they should be actively warmed using forced-air warming until they are discharged from the recovery room or until they are comfortably warm. <b>[2008]</b></div></li></ul></p></dd></dl><dl class="bkr_refwrap"><dt>1.4.2.</dt><dd id="cha.lt57"><p class="no_top_margin">Patients should be kept <a href="#abb_DL1_DI2">comfortably warm</a> when back on the ward.
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<ul id="cha.l15"><li id="cha.lt58" class="half_rhythm"><div>Their temperature should be measured and documented on arrival at the ward.</div></li><li id="cha.lt59" class="half_rhythm"><div>Their temperature should then be measured and documented as part of routine 4-hourly observations.</div></li><li id="cha.lt60" class="half_rhythm"><div>They should be provided with at least 1 cotton sheet plus 2 blankets, or a duvet. <b>[2008]</b></div></li></ul></p></dd></dl><dl class="bkr_refwrap"><dt>1.4.3.</dt><dd id="cha.lt61"><p class="no_top_margin">If the patient’s temperature falls below 36.0°C while on the ward:
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<ul id="cha.l16"><li id="cha.lt62" class="half_rhythm"><div>they should be warmed using forced-air warming until they are comfortably warm</div></li><li id="cha.lt63" class="half_rhythm"><div>their temperature should be measured and documented at least every 30 minutes during warming. <b>[2008]</b></div></li></ul></p></dd></dl></dl></div><div id="cha.s1.5"><h3>Terms used in this guideline</h3><dl><dt id="abb_DL1_DI1">Active warming</dt><dd><p>A process that transfers heat to the patient.</p></dd><dt id="abb_DL1_DI2">Comfortably warm</dt><dd><p>The expected normal temperature range of adult patients (between 36.5°C and 37.5°C).</p></dd><dt id="abb_DL1_DI3">Core temperature</dt><dd><p>The temperature of the blood and internal organs.</p></dd><dt id="abb_DL1_DI4">Hypothermia</dt><dd><p>Core temperature below 36.0°C.</p></dd><dt id="abb_DL1_DI5">Temperature</dt><dd><p>Core temperature.</p></dd></dl></div></div><div id="cha.s2"><h2 id="_cha_s2_">Putting this guideline into practice</h2><p>NICE has produced <a href="http://www.nice.org.uk/guidance/cg65/resources" ref="pagearea=body&targetsite=external&targetcat=link&targettype=uri">tools and resources</a> to help you put this guideline into practice.</p><p>Putting recommendations into practice can take time. How long may vary from guideline to guideline, and depends on how much change in practice or services is needed. Implementing change is most effective when aligned with local priorities.</p><p>Changes recommended for clinical practice that can be done quickly – like changes in prescribing practice – should be shared quickly. This is because healthcare professionals should use guidelines to guide their work – as is required by professional regulating bodies such as the General Medical and Nursing and Midwifery Councils.</p><p>Changes should be implemented as soon as possible, unless there is a good reason for not doing so (for example, if it would be better value for money if a package of recommendations were all implemented at once).</p><p>Different organisations may need different approaches to implementation, depending on their size and function. Sometimes individual practitioners may be able to respond to recommendations to improve their practice more quickly than large organisations</p><p>Here are some pointers to help put NICE guidelines into practice:
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<ol id="cha.l17"><li id="cha.lt64" class="half_rhythm"><div><b>Raise awareness</b> through routine communication channels, such as email or newsletters, regular meetings, internal staff briefings and other communications with all relevant partner organisations. Identify things staff can include in their own practice straight away.</div></li><li id="cha.lt65" class="half_rhythm"><div><b>Identify a lead</b> with an interest in the topic to champion the guideline and motivate others to support its use and make service changes, and to find out any significant issues locally.</div></li><li id="cha.lt66" class="half_rhythm"><div><b>Carry out a baseline assessment</b> against the recommendations to find whether there are gaps in current service provision.</div></li><li id="cha.lt67" class="half_rhythm"><div><b>Think about what data you need to measure improvement</b> and plan how you will collect it. You may want to work with other health and social care organisations and specialist groups to compare current practice with the recommendations. This may also help identify local issues that will slow or prevent implementation.</div></li><li id="cha.lt68" class="half_rhythm"><div><b>Develop an action plan</b>, with the steps needed to put the guideline into practice, and make sure it is ready as soon as possible. Big, complex changes may take longer to implement, but some may be quick and easy to do. An action plan will help in both cases.</div></li><li id="cha.lt69" class="half_rhythm"><div><b>For very big changes</b> include milestones and a business case, which will set out additional costs, savings and possible areas for disinvestment. A small project group could develop the action plan. The group might include the guideline champion, a senior organisational sponsor, staff involved in the associated services, finance and information professionals.</div></li><li id="cha.lt70" class="half_rhythm"><div><b>Implement the action plan</b> with oversight from the lead and the project group. Big projects may also need project management support.</div></li><li id="cha.lt71" class="half_rhythm"><div><b>Review and monitor</b> how well the guideline is being implemented through the project group. Share progress with those involved in making improvements, as well as relevant boards and local partners.</div></li></ol></p><p>NICE provides a comprehensive programme of support and resources to maximise uptake and use of evidence and guidance. See our <a href="https://www.nice.org.uk/about/what-we-do/into-practice" ref="pagearea=body&targetsite=external&targetcat=link&targettype=uri">into practice</a> pages for more information.</p><p>Also see Leng
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G, Moore
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V, Abraham
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S, editors (2014) <a href="http://onlinelibrary.wiley.com/doi/10.1002/9781118543412.ch2/summary" ref="pagearea=body&targetsite=external&targetcat=link&targettype=uri">Achieving high quality care – practical experience from NICE</a>. Chichester: Wiley.</p></div><div id="cha.s3"><h2 id="_cha_s3_">Context</h2><p>Inadvertent perioperative hypothermia is a common but preventable complication of perioperative procedures, which is associated with poor outcomes for patients. Inadvertent perioperative hypothermia should be distinguished from the deliberate induction of hypothermia for medical reasons, which is not covered by this guideline.</p><p>In this guideline, hypothermia is defined as a patient core temperature of below 36.0°C. ‘Temperature’ is used to denote core temperature. Adult surgical patients are at risk of developing hypothermia at any stage of the perioperative pathway. In the guideline, the perioperative pathway is divided into three phases: the preoperative phase is defined as the hour before induction of anaesthesia (when the patient is prepared for surgery on the ward or in the emergency department), the intraoperative phase is defined as total anaesthesia time, and the postoperative phase is defined as the 24 hours after entry into the recovery area in the theatre suite (which will include transfer to and time spent on the ward). The phrase ‘comfortably warm’ is used in recommendations relating to both the preoperative and postoperative phases, and refers to the expected normal temperature range of adult patients (between 36.5°C and 37.5°C).</p><p>During the first 30 to 40 minutes of anaesthesia, a patient’s temperature can drop to below 35.0°C. Reasons for this include loss of the behavioural response to cold and the impairment of thermoregulatory heat-preserving mechanisms under general or regional anaesthesia, anaesthesia-induced peripheral vasodilation (with associated heat loss), and the patient getting cold while waiting for surgery on the ward or in the emergency department.</p><p>In 2016 we updated the guideline to take account of new evidence on active warming devices. We also added new recommendations on the site and method of measuring temperature, which had been identified as an area where guidance would be clinically useful.</p><div id="cha.s3.1"><h3>More information</h3><div id="cha.box3" class="box boxed-text-box whole_rhythm hide-overflow"><p>To find out what NICE has said on topics related to this guideline, see our web page on <a href="https://www.nice.org.uk/guidance/service-delivery--organisation-and-staffing/surgical-care" ref="pagearea=body&targetsite=external&targetcat=link&targettype=uri">surgical care</a>.</p></div></div></div><div id="cha.s4"><h2 id="_cha_s4_">Recommendations for research</h2><p>The guideline committee has made the following recommendations for research.</p><p>As part of the 2016 update, the standing committee made 2 additional research recommendations, on combined methods of intraoperative active warming compared with a single method, and forced-air warming compared with conductive fabric warming in laminar flow theatre. Three research recommendations, on preoperative insulation and warming, comparison of intraoperative warming devices, and use of both preoperative and intraoperative warming, were removed. Details can be found in the addendum.</p><div id="cha.s4.1"><h3>1. Combined methods of intraoperative active warming compared with a single method</h3><p>What is the clinical and cost effectiveness of combined methods of intraoperative active warming compared with a single method in preventing inadvertent perioperative hypothermia?</p><div id="cha.s4.1.1"><h4>Why this is important</h4><p>A combination of active warming devices, such as forced-air warming together with a resistive heating mattress, is usually used to warm patients during surgery. However, there is not enough evidence to show whether this is more clinically effective than a single active warming device, such forced-air warming on its own. Randomised controlled trials (RCTs) should be carried out to compare combined methods of intraoperative active warming (such as forced-air warming together with a resistive heating mattress, or a resistive heating mattress together with a resistive heating blanket) with a single method of active warming (such as forced-air warming). All intravenous fluids should be warmed to 37°C. The RCTs should be sufficiently powered to show clinically significant differences. Primary outcomes should be core temperature at the end of surgery and incidence of hypothermia. Patients may be stratified by anaesthesia duration and type of surgery. Adverse effects and numbers of patients with complications of hypothermia (for example, cardiac events or wound infections) should be recorded. <b>[new 2016]</b></p></div></div><div id="cha.s4.2"><h3>2. Forced-air warming compared with conductive fabric warming in laminar flow theatre</h3><p>What is the clinical and cost effectiveness of intraoperative forced-air warming compared with conductive fabric warming in laminar flow theatre?</p><div id="cha.s4.2.1"><h4>Why this is important</h4><p>It has been suggested that forced-air warming may increase the risk of surgical site infection during implantation surgery (such as joint replacement) because the air flowing through the forced-air warming device disrupts the air flow around the surgical site. Research suggests that conductive warming devices are less likely to cause surgical site infection because the disruption to air flow is less than that caused by forced-air warming. More evidence is needed on the incidence of surgical site infection in implantation surgery using different warming devices. RCTs should be carried out to compare forced-air warming with conductive warming in laminar flow theatre. The RCTs should be sufficiently powered to show clinically significant differences. Primary outcomes should be surgical site infection and core temperature at the end of surgery. Adverse effects and numbers of patients with complications of hypothermia (for example, cardiac events or increased length of hospital stay) should be recorded. <b>[new 2016]</b>.</p></div></div><div id="cha.s4.3"><h3>3. Temperature thresholds for preoperative warming</h3><p>What is the optimum temperature target when warming patients preoperatively?</p><div id="cha.s4.3.1"><h4>Why this is important</h4><p>Preoperative warming is intended to minimise the impact of redistribution hypothermia by reducing the temperature difference between the patient’s core temperature and peripheral temperature. There is a lack of evidence for the optimum preoperative temperature for preventing intraoperative hypothermia. Large RCTs (with at least 100 patients in each arm) should be conducted in adults undergoing surgery to compare warming patients to 36.5°C and 37.0°C in the preoperative phase. Warming should be continued intraoperatively in all patients. All intravenous fluids given should be warmed to 37°C. Primary outcomes should be the incidence of hypothermia, and patient temperature intraoperatively (at 15, 30, 60 and 120 minutes) and in recovery. The duration of warming required to achieve the target preoperative temperature should be recorded. Adverse effects (including patient discomfort) and numbers of patients with complications of hypothermia (for example, morbid cardiac events, wound infection) should be recorded. <b>[2008]</b></p></div></div><div id="cha.s4.4"><h3>4. Effects of nutritional solutions</h3><p>Does the infusion of nutritional solutions such as amino acids and fructose further reduce the incidence of inadvertent perioperative hypothermia in patients receiving intraoperative warming?</p><div id="cha.s4.4.1"><h4>Why this is important</h4><p>Limited evidence suggests that infusion of amino acids or fructose in the preoperative and intraoperative phases may prevent hypothermia. Such infusions may also have additional benefits in fasted patients. A large RCT (with at least 100 patients in each arm) comparing infusions of amino acids, fructose and saline should be conducted in adults undergoing surgery. These infusions should be started before the induction of anaesthesia and continued throughout the intraoperative phase. All patients should receive forced-air warming intraoperatively and all intravenous fluids given should be warmed to 37°C. Primary outcomes should be the incidence of hypothermia, and patient temperature intraoperatively (at 15, 30, 60 and 120 minutes) and in recovery. Adverse effects and numbers of patients with complications of hypothermia (for example, morbid cardiac events, wound infections) should be recorded. <b>[2008]</b></p></div></div></div><div id="cha.s5"><h2 id="_cha_s5_">Update information</h2><div id="cha.s5.1"><h3>December 2016</h3><p>New recommendations have been added on <a href="#cha.s1.1">patients with communication difficulties</a>, <a href="#cha.s1.1">measuring temperature</a>, <a href="#cha.s1.2">warming patients before induction of anaesthesia</a> and <a href="#cha.s1.3">warming patients after induction of anaesthesia</a>. These are marked as <b>[new 2016]</b>.</p><p>Where recommendations end <b>[2008]</b>, the evidence has not been reviewed since the original guideline.</p></div><div id="cha.s5.2"><h3>Amended recommendation wording (change to meaning)</h3><div class="iconblock whole_rhythm clearfix ten_col table-wrap" id="figchatab1"><a href="/books/NBK554181/table/cha.tab1/?report=objectonly" target="object" title="Table" class="img_link icnblk_img figpopup" rid-figpopup="figchatab1" rid-ob="figobchatab1"><img class="small-thumb" src="/books/NBK554181/table/cha.tab1/?report=thumb" src-large="/books/NBK554181/table/cha.tab1/?report=previmg" alt="Image " /></a><div class="icnblk_cntnt"><h4 id="cha.tab1"><a href="/books/NBK554181/table/cha.tab1/?report=objectonly" target="object" rid-ob="figobchatab1">Table</a></h4><p class="float-caption no_bottom_margin">forced air warming should be started preoperatively on the ward or in the emergency department (unless there is a need to expedite surgery because of clinical urgency, for example bleeding or critical limb ischaemia) forced air warming should be maintained <a href="/books/NBK554181/table/cha.tab1/?report=objectonly" target="object" rid-ob="figobchatab1">(more...)</a></p></div></div></div></div><div><h2 id="NBK554181_footnotes">Footnotes</h2><dl class="temp-labeled-list small"><dl class="bkr_refwrap"><dt>[1]</dt><dd><div id="cha.fn1"><p class="no_top_margin">Core temperature is the temperature of the blood and internal organs.</p></div></dd></dl><dl class="bkr_refwrap"><dt>[2]</dt><dd><div id="cha.fn2"><p class="no_top_margin">A direct estimate of core temperature is the reading produced by a thermometer with no correction factors applied.</p></div></dd></dl><dl class="bkr_refwrap"><dt>[3]</dt><dd><div id="cha.fn3"><p class="no_top_margin">Be aware of possible inaccuracies in core temperature estimation when using peripheral sites, such as sublingual or axilla, in patients whose core temperature is outside the normothermic range (36.5°C to 37.5°C).</p></div></dd></dl><dl class="bkr_refwrap"><dt>[4]</dt><dd><div id="cha.fn4"><p class="no_top_margin">An indirect estimate of core temperature is the reading produced by a thermometer after a correction factor has been applied. Examples include infrared tympanic, infrared temporal, infrared forehead and forehead strips.</p></div></dd></dl></dl></div></div><div class="fm-sec"><div><p><b>Your responsibility</b>: The recommendations in this guideline represent the view of NICE, arrived at after careful consideration of the evidence available. When exercising their judgement, professionals and practitioners are expected to take this guideline fully into account, alongside the individual needs, preferences and values of their patients or the people using their service. It is not mandatory to apply the recommendations, and the guideline does not override the responsibility to make decisions appropriate to the circumstances of the individual, in consultation with them and their families and carers or guardian.</p><p>Local commissioners and providers of healthcare have a responsibility to enable the guideline to be applied when individual professionals and people using services wish to use it. They should do so in the context of local and national priorities for funding and developing services, and in light of their duties to have due regard to the need to eliminate unlawful discrimination, to advance equality of opportunity and to reduce health inequalities. Nothing in this guideline should be interpreted in a way that would be inconsistent with complying with those duties.</p><p>Commissioners and providers have a responsibility to promote an environmentally sustainable health and care system and should <a href="https://www.nice.org.uk/about/who-we-are/sustainability" ref="pagearea=body&targetsite=external&targetcat=link&targettype=uri">assess and reduce the environmental impact of implementing NICE recommendations</a> wherever possible.</p></div><p class="small">Created: April 23, 2008; Last Update: December 2016.</p><div class="half_rhythm"><a href="/books/about/copyright/">Copyright</a> © NICE 2019.</div><div class="small"><span class="label">Bookshelf ID: NBK554181</span><span class="label">PMID: <a href="https://pubmed.ncbi.nlm.nih.gov/32134602" title="PubMed record of this title" ref="pagearea=meta&targetsite=entrez&targetcat=link&targettype=pubmed">32134602</a></span></div></div><div class="small-screen-prev"></div><div class="small-screen-next"></div></article><article data-type="boxed-text" id="figobchabox1"><div id="cha.box1" class="box boxed-text-box whole_rhythm hide-overflow"><p>This guideline is the basis of QS49.</p></div></article><article data-type="boxed-text" id="figobchabox2"><div id="cha.box2" class="box boxed-text-box whole_rhythm hide-overflow"><p>People have the right to be involved in discussions and make informed decisions about their care, as described in <a href="http://www.nice.org.uk/about/nice-communities/public-involvement/your-care" ref="pagearea=body&targetsite=external&targetcat=link&targettype=uri">your care</a>.</p><p><a href="http://www.nice.org.uk/about/what-we-do/our-programmes/nice-guidance/nice-guidelines/using-NICE-guidelines-to-make-decisions" ref="pagearea=body&targetsite=external&targetcat=link&targettype=uri">Making decisions using NICE guidelines</a> explains how we use words to show the strength (or certainty) of our recommendations, and has information about prescribing medicines (including off-label use), professional guidelines, standards and laws (including on consent and mental capacity), and safeguarding.</p></div></article><article data-type="boxed-text" id="figobchabox3"><div id="cha.box3" class="box boxed-text-box whole_rhythm hide-overflow"><p>To find out what NICE has said on topics related to this guideline, see our web page on <a href="https://www.nice.org.uk/guidance/service-delivery--organisation-and-staffing/surgical-care" ref="pagearea=body&targetsite=external&targetcat=link&targettype=uri">surgical care</a>.</p></div></article><article data-type="table-wrap" id="figobchatab1"><div id="cha.tab1" class="table"><p class="large-table-link" style="display:none"><span class="right"><a href="/books/NBK554181/table/cha.tab1/?report=objectonly" target="object">View in own window</a></span></p><div class="large_tbl" id="__cha.tab1_lrgtbl__"><table><thead><tr><th id="hd_h_cha.tab1_1_1_1_1" rowspan="1" colspan="1" style="text-align:left;vertical-align:top;">Recommendation in 2008 guideline</th><th id="hd_h_cha.tab1_1_1_1_2" rowspan="1" colspan="1" style="text-align:left;vertical-align:top;">Recommendation in current guideline</th><th id="hd_h_cha.tab1_1_1_1_3" rowspan="1" colspan="1" style="text-align:left;vertical-align:top;">Reason for change</th></tr></thead><tbody><tr><td headers="hd_h_cha.tab1_1_1_1_1" rowspan="1" colspan="1" style="text-align:left;vertical-align:top;">If the patient’s temperature is below 36.0°C:
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<ul id="cha.l18"><li id="cha.lt72" class="half_rhythm"><div>forced air warming should be started preoperatively on the ward or in the emergency department (unless there is a need to expedite surgery because of clinical urgency, for example bleeding or critical limb ischaemia)</div></li><li id="cha.lt73" class="half_rhythm"><div>forced air warming should be maintained throughout the intraoperative phase. [1.2.5]</div></li></ul></td><td headers="hd_h_cha.tab1_1_1_1_2" rowspan="1" colspan="1" style="text-align:left;vertical-align:top;">
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<p>If the patient’s temperature is below 36.0°C, start active warming preoperatively on the ward or in the emergency department (unless there is a need to expedite surgery because of clinical urgency, for example bleeding or critical limb ischaemia). <b>[2008, amended 2016]</b> [<a href="#cha.lt32">1.2.3</a>]</p>
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<p>Maintain active warming throughout the intraoperative phase. <b>[2008, amended 2016]</b> [<a href="#cha.lt34">1.2.5</a>]</p>
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</td><td headers="hd_h_cha.tab1_1_1_1_3" rowspan="1" colspan="1" style="text-align:left;vertical-align:top;">
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<p>‘Forced air warming’ has been amended to ‘active warming’ to include other types of active warming.</p>
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<p>The second bullet point in the 2008 recommendation has been replaced by a separate recommendation to maintain active warming throughout the intraoperative phase, which applies to all patients regardless of their temperature before they leave the ward or emergency department.</p>
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</td></tr><tr><td headers="hd_h_cha.tab1_1_1_1_1" rowspan="1" colspan="1" style="text-align:left;vertical-align:top;">On transfer to the theatre suite:
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<ul id="cha.l19"><li id="cha.lt74" class="half_rhythm"><div>the patient should be kept comfortably warm</div></li><li id="cha.lt75" class="half_rhythm"><div>the patient should be encouraged to walk to theatre where appropriate. [1.2.8]</div></li></ul></td><td headers="hd_h_cha.tab1_1_1_1_2" rowspan="1" colspan="1" style="text-align:left;vertical-align:top;">On transfer to the theatre suite:
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<ul id="cha.l20"><li id="cha.lt76" class="half_rhythm"><div>active warming should be continued (or re-started as soon as possible)</div></li><li id="cha.lt77" class="half_rhythm"><div>the patient should be encouraged to walk to theatre where appropriate. <b>[2008, amended 2016]</b> [<a href="#cha.lt36">1.2.7</a>]</div></li></ul></td><td headers="hd_h_cha.tab1_1_1_1_3" rowspan="1" colspan="1" style="text-align:left;vertical-align:top;">‘The patient should be kept comfortably warm’ has been amended to ‘active warming should be continued (or re-started as soon as possible)’ to align with the new <a href="#cha.lt33">recommendation (1.2.4)</a> to start active warming at least 30 minutes before induction of anaesthesia.</td></tr><tr><td headers="hd_h_cha.tab1_1_1_1_1" rowspan="1" colspan="1" style="text-align:left;vertical-align:top;">1.3.4 In the theatre suite:
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<ul id="cha.l21"><li id="cha.lt78" class="half_rhythm"><div>the ambient temperature should be at least 21°C while the patient is exposed</div></li><li id="cha.lt79" class="half_rhythm"><div>once forced air warming is established, the ambient temperature may be reduced to allow better working conditions</div></li><li id="cha.lt80" class="half_rhythm"><div>using equipment to cool the surgical team should also be considered. [1.3.4]</div></li></ul></td><td headers="hd_h_cha.tab1_1_1_1_2" rowspan="1" colspan="1" style="text-align:left;vertical-align:top;"><a href="#cha.lt42">1.3.4</a> In the theatre suite:
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<ul id="cha.l22"><li id="cha.lt81" class="half_rhythm"><div>the ambient temperature should be at least 21°C while the patient is exposed</div></li><li id="cha.lt82" class="half_rhythm"><div>once active warming is established, the ambient temperature may be reduced to allow better working conditions</div></li><li id="cha.lt83" class="half_rhythm"><div>using equipment to cool the surgical team should also be considered. <b>[2008, amended 2016]</b> [<a href="#cha.lt42">1.3.4</a>]</div></li></ul></td><td headers="hd_h_cha.tab1_1_1_1_3" rowspan="1" colspan="1" style="text-align:left;vertical-align:top;">‘Forced air warming’ has been amended to ‘active warming’ to include other types of active warming.</td></tr></tbody></table></div></div></article></div><div id="jr-scripts"><script src="/corehtml/pmc/jatsreader/ptpmc_3.22/js/libs.min.js"> </script><script src="/corehtml/pmc/jatsreader/ptpmc_3.22/js/jr.min.js"> </script></div></div>
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