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Effect of seasonal variation in daylight on bilirubin level in premature infants
Insights
Daylight exposure significantly lowers serum bilirubin levels in preterm infants. Infants born during brighter months had lower bilirubin, requiring fewer interventions, highlighting the importance of light in neonatal care wards.
Area of Science:
- Neonatal Medicine
- Environmental Health
- Pediatrics
Background:
- Jaundice is common in preterm infants.
- Serum bilirubin levels can pose health risks.
- Seasonal variations in daylight may influence neonatal health.
Purpose of the Study:
- To investigate the impact of daylight on serum bilirubin levels in preterm infants.
- To assess if seasonal light exposure affects jaundice severity in newborns.
- To determine the role of natural light in neonatal ward design.
Main Methods:
- Study involved 86 preterm infants (birthweight < 2500 g) over one year in Oulu, Finland.
- Infants were monitored in incubators with complete exposure except for nappies.
- Serum bilirubin levels were compared between infants born in light vs. dark halves of the year.
Main Results:
- Significantly lower serum bilirubin levels were observed from day five onwards in infants born during the lighter half of the year.
- Fewer infants in the 'light group' (4) developed hyperbilirubinemia (> 255 mumol/l) compared to the 'dark group' (10).
- Fewer exchange transfusions were needed in the 'light group' (2) versus the 'dark group' (4).
Conclusions:
- Natural light conditions appear to be important for managing serum bilirubin levels in preterm infants.
- The findings suggest that environmental light exposure should be considered in the design of neonatal care units.
- Optimizing light exposure may help reduce the incidence and severity of neonatal jaundice.
Abstract:
The effect of daylight on the serum bilirubin level of preterm infants (birthweight less than 2500 g) during the first 10 days of life was studied in a district of Finland (Oulu, latitude 65 degrees ĺ) with large seasonal variations in the length of daylight (range 3 to 22 h). 86 preterm infants born consecutively during one calendar year were studied in incubators where they were completely exposed except for nappies. A significantly lower bilirubin value from the fifth day of life onwards was recorded ih the group of infants born during the light half of the year, compared with the infants born during the dark half of the year. Only 4 infants developed total bilirubin levels higher than 255 mumol/l in the "light group", as compared with 10 in the "dark group". 2 infants in the light group required exchange transfusion, while 4 in the dark group did. It is concluded than natural light conditions are of importance in the design of wards for newborn infants.