Zinc and Copper Absorption in Neonates With Bilious Losses
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|ClinicalTrials.gov Identifier: NCT00738283|
Recruitment Status : Completed
First Posted : August 20, 2008
Results First Posted : August 21, 2015
Last Update Posted : April 11, 2017
We propose to examine the absorption and excretion of zinc and copper in infants with ostomies. This will be accomplished by measuring baseline excretion and serum levels of zinc, copper, and ceruloplasmin, and by utilizing stable isotopes of zinc and copper to measure absorption and excretion.
To determine how the presence of an ileostomy impacts zinc and copper metabolism in infants at three time points: 1) when the infant has an ostomy and is receiving the majority of calories from total parenteral nutrition (TPN); 2) when the infant has an ostomy and is receiving primarily enteral nutrition without TPN; and 3) when/if the infant has a surgery to reconnect the bowel and is receiving primarily enteral nutrition.
For the first part of the study, excretion data for zinc will be obtained for ostomy patients. We hypothesize that infants with an ostomy will excrete more zinc in their stools than healthy term or preterm infants without ostomies.
For the second part of the study, we will obtain data on zinc absorption, secretion, and excretion through use of stable isotopes. Jalla et al determined that healthy infants retain zinc of 0.4 mg/day. We hypothesize that due to increased zinc losses, the infants in the study will be less positive than the healthy infants in the study by Jalla et al. Our study is designed to be able to detect if the ostomy patients net retention is one-half that described by Jalla (i.e. 0.2 mg/d). We will also obtain data on copper absorption, secretion, and excretion through the use of stable isotopes in the second part of the study. As a pilot study, we do not fully know what to expect regarding copper levels in infants with ostomies, but we hypothesize that they may be less positive than healthy infants without ostomies. Also, we hypothesize that zinc and copper are competitively absorbed in the gut; therefore, infants who receive more zinc may absorb less copper.
For the third part of the study, we will obtain data on zinc absorption through the use of stable isotopes after the infant has had surgery to reanastomose the bowel. We hypothesize that there may be continued zinc losses above those documented for healthy infants who have never had an ostomy, but decreased losses compared to when the infant had an ostomy.
|Condition or disease|
Show Detailed Description
|Study Type :||Observational|
|Actual Enrollment :||17 participants|
|Official Title:||Zinc and Copper Absorption in Neonates With Bilious Losses|
|Study Start Date :||September 2008|
|Primary Completion Date :||September 2010|
|Study Completion Date :||December 2010|
- Zinc Absorption [ Time Frame: 96 hours after single feed infusion ]
Zinc fractional absorption was measured using a dual tracer stable isotope method in which 67Zn was given orally with a single feed followed immediately by infusion of 70Zn intravenously. A spot urine sample was collected 96 hours after the infusion and the relative dose-corrected enrichments used to calculate fractional absorption at the time oral isotope was administered.
Tracer:tracee ratios (TTR), measured by ICP-MS, were used to calculated fractional zinc absorption.
Biospecimen Retention: Samples Without DNA
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Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00738283
|United States, Texas|
|Baylor College of Medicine|
|Houston, Texas, United States, 77030|
|Texas Children's Hospital|
|Houston, Texas, United States, 77030|
|Principal Investigator:||Steven A Abrams, MD||Baylor College of Medicine|