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Transepithelial electric potential difference in newborns undergoing phototherapy
Insights
Phototherapy for newborn jaundice may damage the duodenal mucosa barrier, increasing gut fluid secretion. This bilirubin-induced effect could explain phototherapy-associated diarrhea in infants.
Area of Science:
- Neonatal Medicine
- Gastroenterology
- Biochemistry
Background:
- Hyperbilirubinemia is common in newborns.
- Phototherapy is a standard treatment for neonatal jaundice.
- Diarrhea is a frequent side effect of phototherapy in infants.
Purpose of the Study:
- To investigate the effect of phototherapy on duodenal mucosa in hyperbilirubinemic newborns.
- To explore the potential role of bilirubin in damaging the intestinal barrier.
- To understand the mechanism behind phototherapy-induced diarrhea.
Main Methods:
- Measurement of transepithelial electric potential difference (TEPD) in duodenal mucosa.
- Analysis of nonconjugated bilirubin and photobilirubin levels in duodenal juice.
- Observation of hyperbilirubinemic newborns undergoing phototherapy.
Main Results:
- Phototherapy significantly decreased duodenal TEPD.
- Nonconjugated bilirubin and photobilirubin levels increased in duodenal juice.
- Evidence suggests bilirubin damages the duodenal mucosa barrier function.
Conclusions:
- Bilirubin may impair duodenal mucosa barrier function during phototherapy.
- Increased sodium and water secretion into the gut is a likely consequence.
- This mechanism may contribute to diarrhea observed in newborns undergoing phototherapy.
Abstract:
When hyperbilirubinemic newborn babies underwent phototherapy, a significant decrease of the transepithelial electric potential difference of duodenal mucosa was observed, while the content of nonconjugated bilirubin and photobilirubins in the duodenal juice increased. This may indicate that the mucosa barrier function is damaged by bilirubin, with resulting increased sodium and water secretion into the gut. This phenomenon seems to be one of the reasons for diarrhea which is frequently observed in newborns undergoing phototherapy. Further investigations are necessary to understand the mechanism of bilirubin toxicity of the gut in detail.