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Whole-body cooling in neonatal encephalopathy using phase changing material
  1. Sudhin Thayyil1,
  2. Seetha Shankaran2,
  3. Angie Wade3,
  4. Frances M Cowan4,
  5. Manju Ayer5,
  6. Karayapally Satheesan5,
  7. Ceebi Sreejith5,
  8. Hannah Eyles6,
  9. Andrew M Taylor7,
  10. Alan Bainbridge6,
  11. Ernest B Cady6,
  12. Nicola J Robertson1,
  13. David Price5,
  14. Guhan Balraj5
  1. 1Academic Neonatology, Institute for Women's Health, University College London, London, UK
  2. 2Department of Neonatal-Perinatal Medicine, Wayne State University School of Medicine, Children's Hospital of Michigan and Hutzel Women's Hospital, Detroit, USA
  3. 3Department of Paediatric Epidemiology and Biostatistics, Institute of Child Health, University College London, London, UK
  4. 4Department of Paediatrics, Imperial College, London, UK
  5. 5Department of Neonatal Medicine, Institute of Maternal and Child Health, Calicut Medical College, Kerala, India
  6. 6Department of Medical Physics and Bioengineering, University College London Hospitals NHS Foundation Trust, London, UK
  7. 7Centre for Cardiovascular Imaging, Institute of Cardiovascular Science, University College London, London, UK
  1. Correspondence to Dr Sudhin Thayyil, Academic Neonatology, Institute for Women's Health, University College London, 74 Huntley Street, London WC1E 6AU, UK; s.thayyil{at}

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Whole body cooling improves outcomes after neonatal encephalopathy (NE) in high-income countries1; however, effective low technology cooling devices suitable for use in low and middle-income countries (LMIC) is lacking.2 Although cooling using ice is effective in tertiary neonatal units, dangerous temperature fluctuations may occur if continuous temperature monitoring and nursing support is not available.2 Phase changing materials (PCM) are made of salt hydride, fatty acid, and esters or paraffin, and melt at a set point; in the process they can store or release large amounts of energy (figure 1). We examined the feasibility of administering whole body cooling using PCM.

Figure 1

Whole-body cooling by phase changing material. (A) Heat exchange in phase changing material (PCM). When in contact with a warm object, PCM (melting point 32°C) absorbs heat and slowly melts, thus reducing the …

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