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WATER LOSS FROH THE SKIN OF NEWBORN INFANTS DURING PHOTOTHERAPY

Transepidermal water loss was studied in 10 fullterm and 10 preterm infants (GA 29-33 w) before and during phototherapy.The method to measure evaporation from the skin is noninvasive and based on determination of the water vapor pressure gradient close to the skin surface. The sensors are not influenced by the radiative energy from the phototherapy equipment.The study was made with the infant naked in an incubator with a controlled environment as to temperature, ambient humidity and air velocity.In term infants the mean evaporation rate (ER: g/m2h) from an interscapular skin area was 3.1 both before and after 30 min. of phototherapy. In the preterm infants ER was 10.2 before and 10.5 after 90 min. of phototherapy (n=10) and in another comparison 10.4 before and 10.4 after 120 min. of phototherapy (n=6).This study does not confirm that water loss from the skin increases because of phototherapy, as has been suggested in previously published papers.