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Journal of veterinary internal medicine2019; 33(4); 1766-1774; doi: 10.1111/jvim.15527

Multiple adrenocortical steroid response to administration of exogenous adrenocorticotropic hormone to hospitalized foals.

Abstract: The hypothalamic-pituitary-adrenal axis regulates the response to sepsis-associated stress. Relative adrenal insufficiency or adrenocorticotropic hormone (ACTH):cortisol imbalance, defined as a poor cortisol response to administration of ACTH, is common and associated with death in hospitalized foals. However, information on other adrenal steroid response to ACTH stimulation in sick foals is minimal. Objective: To investigate the response of multiple adrenocortical steroids to administration of ACTH in foals. Methods: Hospitalized (n = 34) and healthy (n = 13) foals. Methods: In this prospective study, hospitalized foals were categorized into 2 groups using cluster analysis based on adrenal steroids response to ACTH stimulation: Cluster 1 (n = 11) and Cluster 2 (n = 23). After baseline blood sample collection, foals received 10 μg of ACTH with additional samples collected at 30 and 90 minutes after ACTH. Steroid and ACTH concentrations were determined by immunoassays. The area under the curve (AUC) and Delta were calculated for each hormone. Results: The AUC for cortisol, aldosterone, androstenedione, pregnenolone, 17α-OH-progesterone, and progesterone were higher in critically ill (Cluster 1) compared to healthy foals (P < .01). Delta for cortisol and 17α-OH-progesterone was lower in Cluster 1 (24%, 26.7%) and Cluster 2 (16%, 11.2%) compared to healthy foals (125%, 71%), respectively (P < .05). Foals that died had increased AUC for endogenous ACTH (269 versus 76.4 pg/mL/h, P < .05) accompanied by a low AUC for cortisol (5.5 versus 15.5 μg/dL/h, P < .05), suggesting adrenocortical dysfunction. Conclusions: The 17α-OH-progesterone response to administration of ACTH was a good predictor of disease severity and death in hospitalized foals.
Publication Date: 2019-05-20 PubMed ID: 31111575PubMed Central: PMC6639474DOI: 10.1111/jvim.15527Google Scholar: Lookup
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  • Journal Article

Summary

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The research study examines how different adrenocortical steroids in foals (young horses) react to the administration of adrenocorticotropic hormone (ACTH), considering that the effectiveness of the cortisol response to ACTH has been associated with foals’ survival chances.

Research Objectives and Methods

  • The primary objective of this study was to assess how various adrenocortical steroids respond to ACTH administration in foals. This study is based on the role the hypothalamic-pituitary-adrenal axis plays in regulating the body’s response to sepsis-related stress.
  • The study was carried out on two groups of foals: a hospitalised group (34 foals) and a healthy group (13 foals). The hospitalised foals were further divided into two clusters based on their adrenal steroids’ response to ACTH stimulation.
  • Baseline blood samples were obtained from the foals before they were given 10 μg of ACTH. Further samples were taken 30 and 90 minutes after ACTH administration.
  • The researchers measured the concentrations of the steroid and ACTH through immunoassays. The area under the curve (AUC) and Delta (a measure of change) were calculated for each hormone.

Findings and Conclusions

  • Foals in critical health (Cluster 1) had higher AUC for cortisol, aldosterone, androstenedione, pregnenolone, 17α-OH-progesterone, and progesterone compared to the healthy group. This finding indicates higher levels of these hormones in response to stress in critically ill foals.
  • Critically ill foals (Cluster 1) and less critically ill foals (Cluster 2) had lower Delta measures for cortisol and 17α-OH-progesterone compared to the healthy group.
  • Foals that died had a high AUC for endogenous ACTH but a low AUC for cortisol, suggesting a dysfunction in the adrenal gland’s reaction to ACTH.
  • The study concludes that the response of 17α-OH-progesterone to ACTH can be a reliable indicator of disease severity, as well as a predictor of death in hospitalized foals.

Cite This Article

APA
Dembek KA, Johnson LM, Timko KJ, Minuto JS, Hart KA, Barr BS, Toribio RE. (2019). Multiple adrenocortical steroid response to administration of exogenous adrenocorticotropic hormone to hospitalized foals. J Vet Intern Med, 33(4), 1766-1774. https://doi.org/10.1111/jvim.15527

Publication

ISSN: 1939-1676
NlmUniqueID: 8708660
Country: United States
Language: English
Volume: 33
Issue: 4
Pages: 1766-1774

Researcher Affiliations

Dembek, Katarzyna A
  • Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Iowa State University, Ames, Iowa.
Johnson, Lindsey M
  • Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, Ohio.
Timko, Kathryn J
  • Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, Ohio.
Minuto, Jillian S
  • Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, Ohio.
Hart, Kelsey A
  • Department of Large Animal Medicine, University of Georgia College of Veterinary Medicine, Athens, Georgia.
Barr, Bonnie S
  • Internal Medicine, Rood and Riddle Equine Hospital, Lexington, Kentucky.
Toribio, Ramiro E
  • Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, Ohio.

MeSH Terms

  • 17-alpha-Hydroxyprogesterone / blood
  • Adrenal Cortex Hormones / blood
  • Adrenocorticotropic Hormone / administration & dosage
  • Adrenocorticotropic Hormone / pharmacology
  • Animals
  • Animals, Newborn
  • Area Under Curve
  • Cluster Analysis
  • Critical Illness
  • Female
  • Horse Diseases / blood
  • Horse Diseases / drug therapy
  • Horse Diseases / mortality
  • Horses
  • Male
  • Prognosis
  • Prospective Studies
  • Sepsis / drug therapy
  • Sepsis / veterinary

Grant Funding

  • T35 OD010977 / NIH HHS
  • Grayson-Jockey Club Research Foundation
  • Fellowship Training Grant / Morris Animal Foundation

Conflict of Interest Statement

Authors declare no conflict of interest.

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Citations

This article has been cited 5 times.
  1. Elder E, Wong D, Johnson K, Robertson H, Marner M, Dembek K. Assessment of the hypothalamic-pituitary-adrenocortical axis function using a vasopressin stimulation test in neonatal foals. J Vet Intern Med 2023 Sep-Oct;37(5):1881-1888.
    doi: 10.1111/jvim.16808pubmed: 37432047google scholar: lookup
  2. Johnson K, Peterson J, Kopper J, Dembek K. The hypothalamic-pituitary-adrenal axis response to ovine corticotropin-releasing-hormone stimulation tests in healthy and hospitalized foals. J Vet Intern Med 2023 Jan;37(1):292-301.
    doi: 10.1111/jvim.16604pubmed: 36651191google scholar: lookup
  3. Hernández-Avalos I, Mota-Rojas D, Mendoza-Flores JE, Casas-Alvarado A, Flores-Padilla K, Miranda-Cortes AE, Torres-Bernal F, Gómez-Prado J, Mora-Medina P. Nociceptive pain and anxiety in equines: Physiological and behavioral alterations. Vet World 2021 Nov;14(11):2984-2995.
  4. Kinsella HM, Hostnik LD, Rings LM, Swink JM, Burns TA, Toribio RE. Glucagon, insulin, adrenocorticotropic hormone, and cortisol in response to carbohydrates and fasting in healthy neonatal foals. J Vet Intern Med 2021 Jan;35(1):550-559.
    doi: 10.1111/jvim.16024pubmed: 33415818google scholar: lookup
  5. Swink JM, Rings LM, Snyder HA, McAuley RC, Burns TA, Dembek KA, Gilsenan WF, Browne N, Toribio RE. Dynamics of androgens in healthy and hospitalized newborn foals. J Vet Intern Med 2021 Jan;35(1):538-549.
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