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A prospective analysis of cholestasis in infants supported with extracorporeal membrane oxygenation
B Shneider1, J Cronin, L Van Marter
1Department of Medicine, Children's Hospital, Boston, Massachusetts.
Insights
Infant cholestasis during extracorporeal membrane oxygenation is linked to hemolysis and di-(2-ethylhexyl) phthalate exposure. These factors may inhibit bilirubin excretion, leading to direct hyperbilirubinemia.
Area of Science:
- Neonatalogy
- Pediatric Gastroenterology
- Critical Care Medicine
Background:
- Cholestasis is a common complication in infants requiring extracorporeal membrane oxygenation (ECMO).
- The exact causes of ECMO-associated cholestasis are not fully understood.
- Potential contributing factors include hemolysis and exposure to plasticizers like di-(2-ethylhexyl) phthalate.
Purpose of the Study:
- To prospectively investigate the association between hemolysis and di-(2-ethylhexyl) phthalate exposure with cholestasis in infants on ECMO.
- To identify key factors contributing to the development and severity of cholestasis during ECMO support.
Main Methods:
- Prospective study design.
- Measurement of di-(2-ethylhexyl) phthalate levels.
- Quantification of hemolysis via maximum free hemoglobin levels.
- Assessment of cholestasis and other clinical/laboratory parameters.
Main Results:
- Both di-(2-ethylhexyl) phthalate levels and hemolysis (maximum free hemoglobin) were significantly associated with the degree of cholestasis (p < 0.025).
- Other investigated clinical and laboratory factors did not show a significant relationship with cholestasis severity.
- Findings suggest a link between ECMO-related hemolysis, phthalate exposure, and cholestasis development.
Conclusions:
- Hemolysis during ECMO may generate a substantial bilirubin load.
- Di-(2-ethylhexyl) phthalate exposure might impair bilirubin excretion, potentially via mechanisms similar to inspissated bile syndrome.
- This leads to direct hyperbilirubinemia with minimal hepatocellular or canalicular injury in ECMO-supported infants.
Abstract:
Cholestasis develops in many infants supported with extracorporeal membrane oxygenation. We prospectively investigated the role of hemolysis and di-(2-ethylhexyl) phthalate exposure in the development of this cholestasis. Both di-(2-ethylhexyl) phthalate levels and hemolysis, as measured by maximum free hemoglobin, were significantly (p less than 0.025) associated with the degree of cholestasis. Other clinical and laboratory factors that may contribute to cholestasis were also investigated and not found to be related to the degree of cholestasis. We speculate that hemolysis during extracorporeal membrane oxygenation support produces a large bilirubin load whose excretion is inhibited by mechanisms similar to the inspissated bile syndrome and/or by di-(2-ethylhexyl) phthalate. This would result in a predominantly direct hyperbilirubinemia with little evidence of hepatocellular or canalicular injury.