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Licensed Unlicensed Requires Authentication Published by De Gruyter April 20, 2022

Central adrenal insufficiency screening with morning plasma cortisol and ACTH levels in Prader–Willi syndrome

Moris A. Angulo, Merlin G. Butler ORCID logo, Waheeda A. Hossain, Mariano Castro-Magana and Jorge Corletto

Abstract

Objectives

Prader–Willi syndrome (PWS) is a complex genetic disorder with severe hypotonia, failure to thrive, childhood obesity, hypogonadism/hypogenitalism and learning/behavioral problems with endocrine-related growth and other hormone deficiencies. The prevalence of central adrenal insufficiency (CAI) using dynamic testing ranges from rare to 60%. We compared routine morning plasma cortisol (MPC) and ACTH levels in large cohorts of PWS and control children to address CAI.

Methods

Retrospective analysis of MPC and ACTH levels was undertaken in 128 PWS growth hormone (GH)-treated children under medical care before considering dynamic testing for CAI and 128 non-syndromic control children with short stature evaluated for GH deficiency.

Results

The average MPC level in PWS was 9.7 ± 3.7 μg/dL with no difference in age, gender or PWS genetic subtype and 13.4 ± 5.7 μg/dL in the control group. MPC levels were significantly lower (p < 0.05) in PWS but in the normal range. The morning plasma ACTH level in the PWS group was 22.1 ± 8.0 pg/mL with one individual having an initial low plasma ACTH level (8 pg/mL), but normal upon repeat.

Conclusions

MPC levels in PWS are normal and comparable with control children, without evidence or increased risk of CAI. Lower but normal MPC levels were seen in PWS and suggestive of reduced local regeneration of cortisol from cortisone in adipose tissue by the GH-IGF-I system. Hence, MPC measures alone or in combination with ACTH should be considered for initial screening for CAI in PWS but prior to dynamic testing.


Corresponding author: Merlin G. Butler, MD, PhD, Departments of Psychiatry & Behavioral Sciences and Pediatrics, Kansas University Medical Center, 3901 Rainbow Boulevard, MS 4015, Kansas City, KS 66160, USA, Phone: (913) 588-1800, Fax: (913) 588-1305, E-mail:

Funding source: National Institute of Child Health and Human Development (NICHD)

Award Identifier / Grant number: HD02528

Acknowledgments

We acknowledge the PWS families and the Prader–Willi Syndrome Association (USA).

  1. Research funding: National Institute of Child Health and Human Development (NICHD) grant number HD02528.

  2. Author contribution: All authors have accepted responsibility for the entire content of this manuscript and approved its submission.

  3. Competing interests: Authors state no conflict of interest.

  4. Informed consent: This article is a scholarly description of patients with PWS whose guardians consented for them to receive endocrine testing as part of their medical care from the United States. All pertinent private or protected health information were eliminated and the subjects were deidentified.

  5. Ethical approval: The local Institutional Review Board deemed the study exempt from review.

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Received: 2022-02-09
Accepted: 2022-03-21
Published Online: 2022-04-20
Published in Print: 2022-06-27

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