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Home / Equine Research Bank / Vet Ophthalmol / Safety and accuracy of blind vs. ultrasound-guided dorsal re...
Veterinary ophthalmology2022; 26(2); 135-144; doi: 10.1111/vop.13053

Safety and accuracy of blind vs. ultrasound-guided dorsal retrobulbar nerve blocks in horses-A cadaveric study.

Abstract: There is limited knowledge regarding the safety and accuracy of ultrasound-guided retrobulbar nerve blocks in horses. The aim of this study was to compare these parameters between blind and ultrasound-guided injection techniques for the dorsal retrobulbar nerve block in horses. Methods: Equine cadaver heads were used to inject the retrobulbar space with contrast medium (CM). Injections were performed either blindly based on anatomic landmarks (blind group, n = 44) or under ultrasonographic guidance (US-group, n = 44), equally divided between an experienced and unexperienced operator. Needle position and distribution of CM were assessed with computed tomography imaging and evaluated by a board-certified veterinary diagnostic imager blinded to the technique. Safety and accuracy of both techniques were compared. Results: Ocular penetration was observed in two cases (n = 2/44) in the blind group but not in the US group (n = 0/44). No intrathecal, intraneural, or intravascular injections were seen in either group. Safety was significantly improved in the US group (p = .026). There was no statistically significant difference between the groups regarding the accuracy of the injection. Excellent accuracy was achieved more often with the ultrasound-guided technique (n = 11/22) than with the blind technique (n = 7/22) when performed by the unexperienced operator, but this difference was not statistically significant. Conclusions: To prevent globe-threatening complications and improve the safety of the injection, we recommend using the ultrasound-guided injection technique for the dorsal retrobulbar nerve block.
© 2022 The Authors. Veterinary Ophthalmology published by Wiley Periodicals LLC on behalf of American College of Veterinary Ophthalmologists.
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Publication Date: 2022-12-19 PubMed ID: 36536509DOI: 10.1111/vop.13053Google Scholar: Lookup
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  • Journal Article

Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

The research article focuses on comparing the safety and precision of blind and ultrasound-guided techniques for injecting the dorsal retrobulbar nerve block in horses. The study showed a significant improvement in safety using an ultrasound-guided technique though there was no statistical difference in accuracy between the two methods.

Methodology

  • The researchers used equine cadaver heads to inject the retrobulbar space with a contrast medium (CM).
  • Two methods of injection were used: blind technique based on anatomic landmarks (blind group, n = 44) and ultrasonographic guidance (US-group, n = 44).
  • The injections were equally divided between an experienced and inexperienced operator.
  • Needle position and distribution of CM were then assessed using computed tomography (CT) imaging.
  • A board-certified veterinary diagnostic imager, unaware of which technique was used, evaluated the results.

Results

  • In the blind group, ocular penetration occurred in two cases, but it did not occur in the US group.
  • There were no cases of intrathecal, intraneural, or intravascular injections in either group.
  • The results significantly favoured the US technique in terms of safety (p = .026).
  • However, there was no significant difference between the blind and US methods regarding the injection’s accuracy.
  • Greater accuracy was more often achieved with the ultrasound-guided technique (11/22) compared to the blind technique (7/22) when executed by the inexperienced operator—though this difference was not statistically significant.

Conclusions

  • The researchers recommend using the ultrasound-guided injection technique for the dorsal retrobulbar nerve block to avoid serious complications for the animal’s eye and improve overall safety.

Cite This Article

APA
Thieme K, Mesquita L, Lieberth S, Dancker C, Doherr MG, Eule JC. (2022). Safety and accuracy of blind vs. ultrasound-guided dorsal retrobulbar nerve blocks in horses-A cadaveric study. Vet Ophthalmol, 26(2), 135-144. https://doi.org/10.1111/vop.13053

Publication

Veterinary ophthalmology
ISSN: 1463-5224
NlmUniqueID: 100887377
Country: England
Language: English
Volume: 26
Issue: 2
Pages: 135-144

Researcher Affiliations

Thieme, Katharina
  • Small Animal Clinic, Freie Universität Berlin, Berlin, Germany.
  • Equine Clinic, Surgery and Radiology, Freie Universität Berlin, Berlin, Germany.
Mesquita, Luis
  • Radiology Department, Willows Veterinary Centre and Referral Service, Solihull, UK.
Lieberth, Simona
  • Equine Clinic, Surgery and Radiology, Freie Universität Berlin, Berlin, Germany.
Dancker, Christian
  • Small Animal Clinic, Freie Universität Berlin, Berlin, Germany.
Doherr, Marcus Georg
  • Institute for Veterinary Epidemiology and Biostatistics, Freie Universität Berlin, Berlin, Germany.
Eule, Johanna Corinna
  • Small Animal Clinic, Freie Universität Berlin, Berlin, Germany.

MeSH Terms

  • Animals
  • Horses
  • Ultrasonography, Interventional / veterinary
  • Ultrasonography, Interventional / methods
  • Nerve Block / veterinary
  • Nerve Block / methods
  • Ultrasonography / veterinary
  • Orbit / diagnostic imaging
  • Cadaver
  • Horse Diseases

Grant Funding

  • European College of Veterinary Ophthalmologists

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