What is Emergency medicine - What are the implications of ventricular and atrial dysrhythmias? Normally, ventricular response is slow in atrial dysrhythmias. They should not be treated since they are innocent. During rewarming, preexisting ventricular ectopy could reappear and throw the picture off. Treatment for ventricular dysrhythmia is challenging since the cold heart may not respond to cardiovascular medications. Only one defibrillation effort (2 J/kg) is advised if the patient is in ventricular fibrillation until the core temperature reaches 30°C to 32°C. With movement, endotracheal intubation, and the insertion of a jugular or subclavian catheter, patients who are moderately or severely hypothermic are at a significant risk of decompensating into cardiac dysrhythmia.

What is Emergency medicine - Does hypothermia require special pharmacologic considerations? Pharmacologic treatment of the pulse and blood pressure should generally be avoided since protein binding increases when body temperature drops and most medications become ineffective.

What is Emergency medicine - . What circumstances make cardiopulmonary resuscitation (CPR) in cases of unintentional hypothermia contraindicated?
​Unless a do-not-resuscitate order has been confirmed, fatal injuries have been found, there are no indications of life, or the chest wall is frozen and cannot be crushed, CPR should begin. A cardiac monitor should be used for 30-45 seconds to check for signs of life since a patient with extreme hypothermia may seem dead and because vital signals may be hard to get.

What is Emergency medicine -When should extracorporeal rewarming be used?
​ In cardiac arrest scenarios, cardiopulmonary bypass, ECMO, continuous arteriovenous and venovenous rewarming, and hemodialysis can all save lives; they can also be used to treat fully frozen extremities, severe rhabdomyolysis, and significant electrolyte fluxes concurrently.

​What is Emergency medicine - . What hot irrigation methods are there?
​Only in extreme circumstances and in conjunction with other procedures can irrigation (or lavage) be attempted. In severe situations, thoracostomy tube irrigation with two tubes is a more effective technique. During big volume resuscitations, intravenous (IV) fluids heated to 40°C–42°C are very beneficial. Seriously hypothermic individuals can be effectively warmed up by double-catheter peritoneal lavage. At a temperature between 40°C and 45°C, infuse 2 L of isotonic dialysate and suction after 20 minutes. The small amount of heat transmission from gastrointestinal irrigation raises the possibility of aspiration. Irrigation of the bladder likewise has little impact.

​What is Emergency medicine - When should airways be rewarmed?
​A mask or endotracheal tube can be used to provide heated, humidified oxygen. By using a mask, heat transfer is not as great, but respiratory heat loss is reduced as the patient is gradually warmed up.

What is Emergency medicine - .  What does "active core rewarming" entail?
​Active core rewarming procedures incorporate methods of delivering heat to the core. Extracorporeal rewarming via extracorporeal membrane oxygenation (ECMO), dialysis, or cardiopulmonary bypass circuits are further options. Heated inhalation, heated infusion, heated central venous catheters, bladder, stomach, thoracic, and peritoneal lavage are other methods.

What is Emergency medicine -Does active external rewarming require special considerations?
​When heat is given directly to the trunk of a patient, the external transfer of heat can be done most safely. Rapidly rewarming vasoconstrictor-ridden extremities in persistently hypothermic individuals may overwhelm a weakened cardiovascular system and cause cardiovascular collapse. Warming lamps, blankets with running water, and forced heated-air rewarming devices like Bair Hugger are frequently utilized. It might be challenging to monitor in a warm tub, and electric blankets can burn vasoconstricted skin quickly.

What is Emergency medicine - .What is the after drop core temperature?
​ Core temperature afterdrop is the frequently noticed ongoing core temperature decrease following the start of external rewarming. Two reasons exist: 1. Equilibration of tissue temperature 2. The circulation of cold peripheral blood returning to the center.

What is Emergency medicine - .  Under what circumstances is active rewarming necessary?
​Age extremes, unstable cardiovascular function, temperatures below 35°C (90°F), and neurological or endocrine dysfunction.