Diagnostic frequency, response to therapy, and long-term prognosis among horses and ponies with pituitary par intermedia dysfunction, 1993-2004.
Abstract: Pituitary pars intermedia dysfunction (PPID) is common in older horses. Objective: To determine diagnosis frequency, prognostic factors, long-term survival, and owner satisfaction with treatment. Methods: Medical records from horses diagnosed with PPID, 1993-2004. Methods: A retrospective cohort design with data collected from the Veterinary Medical Data Base (VMDB) and a cohort of 3 VTHs. Proportional accessions, annual incidence, and demographics were compared for all accessions. During the same period, a subset of medical records (n = 44) was extracted and owners (n = 34) contacted to obtain long-term follow-up information. Results: Diagnoses of PPID were reported for 217 horses that presented to VTHs and were reported to the VMDB. Proportional diagnosis increased from 0.25/1,000 in 1993 to 3.72/1,000 in 2002. For 44 horses included in the follow-up study, the most commons signs were hirsutism (84%) and laminitis (50%). Of 34 horse owners contacted, the average time from onset of signs to diagnosis was 180 days. Improvement in ≥ 1 signs, 2 months after diagnosis, was reported by 9/22 (41%) of horse owners. Clinical signs and clinicopathologic data were not associated with survival, and 50% of horses were alive 4.6 years after diagnosis. Cause of death among horses (15/20; 85%) was euthanasia, and 11/15 (73%) were euthanized because of conditions associated with PPID. Most horse owners (28/29; 97%) said they would treat a second horse for PPID. Conclusions: PPID was diagnosed with increasing frequency, and 50% of horses survived 4.5 years after diagnosis. Owners were satisfied with their horses' quality of life and would treat a second horse if diagnosed.
Copyright © 2012 by the American College of Veterinary Internal Medicine.
Publication Date: 2012-04-24 PubMed ID: 22524260DOI: 10.1111/j.1939-1676.2012.00932.xGoogle Scholar: Lookup
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- Journal Article
- Research Support
- Non-U.S. Gov't
- Clinical Pathology
- Clinical Signs
- Diagnosis
- Disease
- Disease Diagnosis
- Disease Treatment
- Epidemiology
- Equine Health
- Euthanasia
- Geriatric Horses
- Horse Owners
- Horses
- Longitudinal Study
- Observational Study
- Pituitary Pars Intermedia Dysfunction
- Prognosis
- Retrospective Study
- Veterinary Care
- Veterinary Medicine
- Veterinary Practice
- Veterinary Research
Summary
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The research article investigates the patterns of diagnosis, rates of survival, and satisfaction with treatment among horses and ponies diagnosed with Pituitary Par Intermedia Dysfunction (PPID). The findings indicate a significant rise in diagnosis rates over the studied period, with half of the creatures surviving for over four years post-diagnosis.
Research Methodology
- The researchers implemented a retrospective cohort design and referred to data from the Veterinary Medical Data Base (VMDB), as well as from three different veterinary teaching hospitals (VTHs) to complete their study.
- The researchers compared proportional accessions, annual incidence, and demographics for all the horses and ponies that had access to the facilities.
- The researchers conducted a long-term follow-up survey using medical records of 44 horses. They reached out to 34 horse owners, enquiring about the condition of the horses.
Results and Findings
- According to the study, PPID diagnoses were reported in 217 horses that came to the VTHs and appeared in the VMDB.
- The proportional diagnosis rates increased significantly from 0.25 per 1,000 admissions in 1993 to 3.72 per 1,000 in 2002.
- Among the long-term follow-up study involving 44 horses, the most widespread signs of the disease were hirsutism (84%) and laminitis (50%).
- On average, the lapse from outbreak of symptoms to diagnosis was around 180 days.
- Upon diagnosis, 41% of the horse owners reported registering improvement in at least one symptom within two months.
- Horse’s survival didn’t manifest any associations with clinical signs and clinicopathologic data, with half of the creatures surviving approximately 4.6 years after diagnosis.
- The primary cause of death among horses (85%) was euthanization and over 70% of these instances resulted from conditions linked to PPID.
Conclusions and Recommendations
- This research reveals an increasing frequency of PPID diagnoses among horses and ponies.
- It was found that half of the animals diagnosed survived beyond 4.5 years.
- The study also indicates high levels of satisfaction among horse owners concerning QoL (Quality of Life) and treatment for PPID, with 97% expressing they would opt for treatment if a second horse were diagnosed.
Cite This Article
APA
Rohrbach BW, Stafford JR, Clermont RS, Reed SM, Schott HC, Andrews FM.
(2012).
Diagnostic frequency, response to therapy, and long-term prognosis among horses and ponies with pituitary par intermedia dysfunction, 1993-2004.
J Vet Intern Med, 26(4), 1027-1034.
https://doi.org/10.1111/j.1939-1676.2012.00932.x Publication
Researcher Affiliations
- Department of Comparative Medicine, College of Veterinary Medicine, University of Tennessee, Knoxville, TN, USA.
MeSH Terms
- Animals
- Cohort Studies
- Female
- Follow-Up Studies
- Horse Diseases / diagnosis
- Horse Diseases / physiopathology
- Horse Diseases / therapy
- Horses
- Kaplan-Meier Estimate
- Male
- Pituitary Diseases / diagnosis
- Pituitary Diseases / physiopathology
- Pituitary Diseases / therapy
- Pituitary Diseases / veterinary
- Pituitary Gland, Intermediate / physiopathology
- Prognosis
- Retrospective Studies
- Surveys and Questionnaires
- Survival Analysis
Citations
This article has been cited 14 times.- Kirkwood NC, Hughes KJ, Stewart AJ. Prospective Case Series of Clinical Signs and Adrenocorticotrophin (ACTH) Concentrations in Seven Horses Transitioning to Pituitary Pars Intermedia Dysfunction (PPID). Vet Sci 2022 Oct 17;9(10).
- Kirkwood NC, Hughes KJ, Stewart AJ. Pituitary Pars Intermedia Dysfunction (PPID) in Horses. Vet Sci 2022 Oct 10;9(10).
- Hinrichsen SL, Yuen KY, Dryburgh EL, Bertin FR, Stewart AJ. Short-Term Effects of Temperature and Thyrotropin-Releasing Hormone Stimulation on Adrenocorticotropin Stability in Horses. Animals (Basel) 2022 Jan 28;12(3).
- Tatum RC, McGowan CM, Dean RS, Ireland JL. Equine pituitary pars intermedia dysfunction: Identifying research priorities for diagnosis, treatment and prognosis through a priority setting partnership. PLoS One 2021;16(1):e0244784.
- Horn R, Stewart AJ, Jackson KV, Dryburgh EL, Medina-Torres CE, Bertin FR. Clinical implications of using adrenocorticotropic hormone diagnostic cutoffs or reference intervals to diagnose pituitary pars intermedia dysfunction in mature horses. J Vet Intern Med 2021 Jan;35(1):560-570.
- Horn R, Bertin FR. Evaluation of combined testing to simultaneously diagnose pituitary pars intermedia dysfunction and insulin dysregulation in horses. J Vet Intern Med 2019 Sep;33(5):2249-2256.
- de Laat MA, Reiche DB, Sillence MN, McGree JM. Incidence and risk factors for recurrence of endocrinopathic laminitis in horses. J Vet Intern Med 2019 May;33(3):1473-1482.
- Carmalt JL, Waldner CL, Allen AL. Equine pituitary pars intermedia dysfunction: An international survey of veterinarians' approach to diagnosis, management, and estimated prevalence. Can J Vet Res 2017 Oct;81(4):261-269.
- Menzies-Gow NJ. Equine Pituitary Pars Intermedia Dysfunction. Vet Sci 2025 Aug 20;12(8).
- Davis EL, Wood AD, Potier JFN. Prevalence and Progression of Resting ACTH, Insulin and Adiponectin Values as Indicators of Suspected Endocrine Diseases in Sport Horses and Ponies Compared to Non-Sport Horses, Ponies and Donkeys. Animals (Basel) 2025 May 1;15(9).
- Schott HC 2nd, Strachota JR, Marteniuk JV, Refsal KR. Long-Term Response of Equids With Pituitary Pars Intermedia Dysfunction to Treatment With Pergolide. J Vet Intern Med 2025 May-Jun;39(3):e70109.
- Bouquet A, Nicol C, Knowles EJ, Schofield I, Menzies-Gow NJ. Development of a health-related quality-of-life assessment tool for equines with pituitary pars intermedia dysfunction. Equine Vet J 2026 Jan;58(1):190-202.
- Fouché N, Doras C, Schüpbach-Regula G, Scherer A, Freudenschuss B, Gerber V. Association Between Adrenocorticotropic Hormone Concentration and Clinical Signs of Pituitary Pars Intermedia Dysfunction in Swiss and Austrian Equids. J Vet Intern Med 2025 Mar-Apr;39(2):e70008.
- Sundra T, Kelty E, Rossi G, Rendle D. Retrospective assessment of the use of extended-release cabergoline in the management of equine pituitary pars intermedia dysfunction. Front Vet Sci 2024;11:1332337.
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