Anaesthesia and hypothermia 

Anaesthesia and hypothermia are closely linked due to the effects of anesthesia on the body's thermoregulatory mechanisms. Here are some key points about this relationship:

Causes of Hypothermia under Anaesthesia

1. Thermoregulatory Impairment : General and regional anesthesia impair the body's ability to regulate temperature. General anesthesia lowers the body's thresholds for vasoconstriction and shivering, while regional anesthesia affects thermoregulatory signals, leading to a drop in core temperature.

2. Heat Redistribution: Anesthesia causes vasodilation, which leads to the redistribution of heat from the body's core to the periphery, resulting in a rapid decrease in core temperature by 0.5°C to 1.5°C within the first hour after induction.

3. Environmental Factors: The operating room environment contributes to heat loss through radiation, convection, conduction, and evaporation. This is exacerbated by exposure to cold surgical tools, prepping solutions, and the cool ambient air.

Consequences of Hypothermia

1. Coagulopathy: Hypothermia affects platelet function and the coagulation cascade, increasing the risk of perioperative blood loss and the need for transfusions.

2. Infection Risk: Reduced tissue perfusion and impaired immune function due to hypothermia elevate the risk of surgical site infections.

3. Prolonged Drug Effects: Hypothermia slows drug metabolism, prolonging the effects of anesthetics and other medications.

4. Cardiac Events and Shivering: Shivering increases metabolic demand and can lead to myocardial ischemia, especially in patients with pre-existing cardiac conditions .

Prevention and Management

1. Prewarming : Actively warming patients before anesthesia induction can reduce the initial drop in core temperature. Prewarming for 10-30 minutes helps equalize the temperature gradient between the core and periphery

2. Intraoperative Measures : Maintaining a warmer ambient temperature, using forced-air warming devices, and warming intravenous fluids and anesthetic gases can help maintain normothermia during surgery .

3. Monitoring : Continuous and accurate monitoring of core temperature is crucial. Using non-invasive core temperature measurement devices can help ensure consistent and accurate readings throughout the perioperative period .

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