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Journal of equine veterinary science2025; 146; 105360; doi: 10.1016/j.jevs.2025.105360

Effect of equine transvaginal follicle aspiration on serum concentrations of acute phase proteins and their utility in diagnosis of ovarian abscess.

Abstract: Transvaginal ultrasound-guided follicle aspiration (TVA) is being performed frequently in equine practice, to recover oocytes for in vitro embryo production via intracytoplasmic sperm injection. While complications from TVA are rare, one of the most prevalent major complications is formation of an ovarian abscess, which can result in the necessity for euthanasia. The acute-phase serum proteins, fibrinogen and serum amyloid A (SAA), are markers of inflammation that might be of use in diagnosis of ovarian abscess. However, no information is available on the effect of standard TVA on these acute phase proteins. We evaluated serum fibrinogen and SAA concentrations in mares (n = 8 and 6, respectively) immediately before and on Days 3, 7 and 14 after performance of TVA. Serum amyloid A levels were at baseline on all days. There was no significant difference in mean serum fibrinogen concentrations between D0 and any day after TVA. There was no significant difference in fibrinogen levels between mares that had undergone repeated TVA and a separate group of mares (n = 14) that had never been subjected to TVA. We then describe four cases of mares that had undergone TVA and subsequently presented with signs associated with possible ovarian abscess, in which serum fibrinogen aided in interpretation. We conclude that fibrinogen and SAA are not elevated in mares undergoing TVA, and thus, elevations in mares following TVA should be investigated further and may support early diagnosis of an ovarian abscess.
Publication Date: 2025-01-22 PubMed ID: 39855430DOI: 10.1016/j.jevs.2025.105360Google Scholar: Lookup
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  • Journal Article

Summary

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The research article focuses on the influence of Transvaginal Ultrasound-Guided Follicle Aspiration (TVA) – a common practice in equine animals – on levels of acute phase proteins in the blood, and how these levels can help diagnose ovarian abscess, a severe complication linked to TVA.

Transvaginal Ultrasound-Guided Follicle Aspiration (TVA)

  • This research goes into the widespread practice of TVA in horses, a method used to retrieve oocytes for producing embryos via intracytoplasmic sperm injection in a laboratory setting.

Serum Concentrations of Acute Phase Proteins

  • As part of the experiment, concentrations of two acute phase proteins, namely fibrinogen and serum amyloid A (SAA), were extensively studied.
  • These proteins, particularly fibrinogen, are commonly known to indicate inflammation or infection in the body.

Study Design and Methods

  • The experiment involved a group of mares whose serum concentrations of the above-mentioned proteins were measured immediately on Days 0, 3, 7 and 14 post-TVA.
  • The research team subsequently compared these results with those of another group of mares, which had never undergone TVA.

Findings and Conclusion

  • Contrary to the initial hypothesis, the tested mares exhibited no significant rise in serum fibrinogen and SAA concentrations even after the TVA procedure.
  • Based on the four cases cited in the article, elevated levels of these specific proteins, especially fibrinogen, in mares post-TVA could serve as early markers for ovarian abscess, thus warranting further probe.
  • As the formation of ovarian abscesses is a major risk associated with TVA and in extreme cases can necessitate euthanasia, this finding presents a potential strategy for early detection and prevention of this severe complication in mares.

Cite This Article

APA
Hinrichs K, Gleason K, Dobbie T, Felix MR. (2025). Effect of equine transvaginal follicle aspiration on serum concentrations of acute phase proteins and their utility in diagnosis of ovarian abscess. J Equine Vet Sci, 146, 105360. https://doi.org/10.1016/j.jevs.2025.105360

Publication

ISSN: 0737-0806
NlmUniqueID: 8216840
Country: United States
Language: English
Volume: 146
Pages: 105360

Researcher Affiliations

Hinrichs, Katrin
  • Department of Clinical Studies - New Bolton Center, University of Pennsylvania School of Veterinary Medicine, 382 West Street Road, Kennett Square, PA, 19348. Electronic address: katrinh@vet.upenn.edu.
Gleason, Kim
  • Department of Clinical Studies - New Bolton Center, University of Pennsylvania School of Veterinary Medicine, 382 West Street Road, Kennett Square, PA, 19348.
Dobbie, Tamara
  • Department of Clinical Studies - New Bolton Center, University of Pennsylvania School of Veterinary Medicine, 382 West Street Road, Kennett Square, PA, 19348.
Felix, Matheus R
  • Department of Clinical Studies - New Bolton Center, University of Pennsylvania School of Veterinary Medicine, 382 West Street Road, Kennett Square, PA, 19348.

MeSH Terms

  • Horses
  • Female
  • Animals
  • Abscess / veterinary
  • Abscess / diagnosis
  • Abscess / blood
  • Horse Diseases / diagnosis
  • Horse Diseases / blood
  • Ovarian Diseases / veterinary
  • Ovarian Diseases / diagnosis
  • Ovarian Diseases / blood
  • Fibrinogen / metabolism
  • Ovarian Follicle
  • Serum Amyloid A Protein / metabolism
  • Acute-Phase Proteins / metabolism

Conflict of Interest Statement

Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: The authors work for an organization that offers transvaginal ultrasound-guided follicle aspiration to clients on a fee-for-service basis.