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Use of Gastrostomy Tube to Prevent Maternal PKU Syndrome

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JIMD Reports - Case and Research Reports, 2012/3

Abstract

Maternal Phenylketonuria Syndrome (MPKU) can occur in infants born to mothers with PKU with poor metabolic control during pregnancy. Elevated phenylalanine (phe) acts as a teratogen to the developing fetus with consequences including intellectual disability, microcephaly, facial dysmorphism, growth retardation, and congenital heart disease. MPKU can be prevented if metabolic control is achieved by 8–10 weeks gestation. If control is not achieved, there is a significant risk for MPKU. Therefore, in women with poor metabolic control at time of pregnancy, establishing metabolic control quickly is important.

Clinically, establishing metabolic control in women with PKU can present challenges. Social issues, psychological issues, and insufficient education about PKU play an important role in a patient’s inability to reinstitute this challenging diet. Maintaining phe levels within a range to allow for infant growth, while preventing toxicity, is challenging, particularly for those women who no longer follow the PKU diet. Gastrostomy tube placement is an option to deliver medical formula to women who are unable to restart diet due to severe nausea or palatability issues.

Here we discuss two pregnancies in which a gastrostomy tube was placed to achieve metabolic control after other measures failed to reduce phe concentrations into the recommended range. For these two pregnancies, placement of the gastrostomy tube led to improvement in phe levels with normal infant outcomes including normal growth, head circumference, and heart structure.

Competing interests: None declared

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Abbreviations

CHD:

Congenital heart disease

Gm:

Grams

Kcals:

Kilocalories

MPKU:

Maternal phenylketonuria syndrome

phe:

Phenylalanine

PKU:

Phenylketonuria

U.S:

United States

Kg:

Kilogram

cm:

centimeter

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Authors

Corresponding author

Correspondence to Jessica A. Scott Schwoerer .

Editor information

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Additional information

Communicated by: John H Walter

Appendices

Synopsis Statement

Gastrostomy tube placement in pregnant women with phenylketonuria is another option to control phenylalanine levels and prevent maternal PKU syndrome.

Jessica Scott Schwoerer

Conflict of Interest Questions

  1. 1.

    Have you in the past 5 years accepted the following from an organization that may in any way gain or lose financially from the result of your study or the conclusion of your review, editorial, or letter:

    1. a.

      Reimbursement for attending a symposium? – No

    2. b.

      A fee for specking or for organizing education? – No

    3. c.

      Funds for research or for a member of staff – No

    4. d.

      A fee for consulting? – No

  2. 2.

    Have you in the past five years been employed by an organization that may in any way gain or lose financially from the result of your study or the conclusion of your review, editorial, or letter? No. Do you hold any stocks or shares in such an organization? No

  3. 3.

    Have you acted as an expert witness on the subject of your study, review, editorial, or letter? No

  4. 4.

    Do you have any other competing financial interests? No

Gregory Rice

Conflict of Interest Questions

  1. 1.

    Have you in the past 5 years accepted the following from an organization that may in any way gain or lose financially from the result of your study or the conclusion of your review, editorial, or letter:

    1. a.

      Reimbursement for attending a symposium? – Yes, BioMarin Pharmaceuticals, Kuvan Advisory Meeting 2009. I do not believe that this publication will have any financial effect on the above but I am disclosing the relationship for completeness.

    2. b.

      A fee for specking or for organizing education? – Yes, BioMarin Pharmaceuticals, Kuvan Advisory Meeting 2010. I do not believe that this publication will have any financial effect on the above but I am disclosing the relationship for completeness.

    3. c.

      Funds for research or for a member of staff – Yes, we are involved in clinical trials sponsored by BioMarin Pharmaceuticals. I do not believe that this publication will have any financial effect on the above but I am disclosing the relationship for completeness.

    4. d.

      A fee for consulting? – No

  2. 2.

    Have you in the past 5 years been employed by an organization that may in any way gain or lose financially from the result of your study or the conclusion of your review, editorial, or letter? No. Do you hold any stocks or shares in such an organization? No

  3. 3.

    Have you acted as an expert witness on the subject of your study, review, editorial, or letter? No

  4. 4.

    Do you have any other competing financial interests? No

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Schwoerer, J.A.S. et al. (2012). Use of Gastrostomy Tube to Prevent Maternal PKU Syndrome. In: JIMD Reports - Case and Research Reports, 2012/3. JIMD Reports, vol 6. Springer, Berlin, Heidelberg. https://doi.org/10.1007/8904_2011_95

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  • DOI: https://doi.org/10.1007/8904_2011_95

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