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Extracted from Survival Guide to Midwifery, 2nd Edition (2012) Diane M. Fraser and Margaret A. Cooper, Oxford; Churchill Livingstone: 2012. Courtesy Elsevier

Hyperthermia is defined as a core temperature above 38°C. The usual cause is overheating of the environment but it can also be a clinical sign of sepsis, brain injury or drug therapy. Infants may attempt to regulate their temperature by increasing their respiratory rate, leading to increased fluid loss by evaporation through the airways. Hyperthermia may cause hypernatraemia, jaundice and recurrent apnoea.

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