Thermal Regulation in Critical Care Medicine

Thermal regulation is central to the management of critically ill patients, influencing cellular metabolism, immune function and clinical outcome. In critical care settings, variations in core body temperature—from hypothermia through normothermia to fever—reflect both adaptive host responses and potential adverse events. Fever, or pyrexia, often signals an active immune response to infection and can enhance antimicrobial mechanisms, whereas hypothermia has been linked to impaired immune cell function, coagulopathy and higher mortality in sepsis. Conversely, uncontrolled hyperthermia may exacerbate metabolic demand and organ dysfunction. Clinical strategies include precise monitoring of core temperature, targeted temperature management in neurocritical care and judicious use of antipyretics, physical cooling or rewarming devices. Integration of thermoregulatory interventions with haemodynamic and respiratory support can modulate inflammation, influence outcomes in sepsis and traumatic brain injury and guide prognostic assessment. Advances in non-invasive monitoring and personalised temperature targets are reshaping practice, highlighting the need for a balanced approach that respects endogenous defence mechanisms while preventing temperature-related harm.

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Thermal Regulation in Critical Care Medicine publication trend

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Technical terms

Thermoregulation: The physiological process of maintaining core body temperature within a narrow range.

Pyrexia (fever): A regulated increase in hypothalamic set point, typically in response to infection or inflammation.

Hyperthermia: Unregulated rise in body temperature without change in hypothalamic set point.

Hypothermia: Core body temperature below the normal lower limit, often defined as < 36 °C.

Neutrophil Extracellular Traps (NETs): Web-like DNA and protein structures released by neutrophils to ensnare pathogens.

Inflammasome: A cytosolic multiprotein complex in immune cells that activates inflammatory cytokines such as IL-1β.

Heat Shock Proteins (HSPs): Stress-inducible molecular chaperones that assist in protein folding and protect against cellular stress.

References

1. Neutrophil extracellular traps formation and clearance is enhanced in fever and attenuated in hypothermia. Frontiers in Immunology (2023).
2. A Preliminary Study of Mild Heat Stress on Inflammasome Activation in Murine Macrophages. Cells (2023).
3. Fever and hypothermia represent two populations of sepsis patients and are associated with outside temperature. Critical Care (2021).