Ultrasound-guided retrobulbar nerve block in horses: a cadaveric study

Morath, Ute; Luyet, Cédric; Spadavecchia, Claudia; Stoffel, Michael Hubert; Hatch, Garry M (2013). Ultrasound-guided retrobulbar nerve block in horses: a cadaveric study. Veterinary anaesthesia and analgesia, 40(2), pp. 205-211. Oxford: Blackwell Science 10.1111/j.1467-2995.2012.00780.x

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Objective  To develop an ultrasound-guided technique for retrobulbar nerve block in horses, and to compare the distribution of three different volumes of injected contrast medium (CM) (4, 8 and 12 mL), with the hypothesis that successful placement of the needle within the retractor bulbi muscle cone would lead to the most effective dispersal of CM towards the nerves leaving the orbital fissure. Study design  Prospective experimental cadaver study. Animals  Twenty equine cadavers. Methods  Ultrasound-guided retrobulbar injections were performed in 40 cadaver orbits. Ultrasound visualization of needle placement within the retractor bulbi muscle cone and spread of injected CM towards the orbital fissure were scored. Needle position and destination of CM were then assessed using computerized tomography (CT), and comparisons performed between ultrasonographic visualization of orbital structures and success rate of injections (intraconal needle placement, CM reaching the orbital fissure). Results  Higher scores for ultrasound visualization resulted in a higher success rate for intraconal CM injection, as documented on the CT images. Successful intraconal placement of the needle (22/34 orbits) resulted in CM always reaching the orbital fissure. CM also reached the orbital fissure in six orbits where needle placement was extraconal. With 4, 8 and 12 mL CM, the orbital fissure was reached in 16/34, 23/34 and 28/34 injections, respectively. Conclusion and clinical relevance  The present study demonstrates the use of ultrasound for visualization of anatomical structures and needle placement during retrobulbar injections in equine orbits. However, this approach needs to be repeated in controlled clinical trials to assess practicability and effectiveness in clinical practice.

Item Type:

Journal Article (Original Article)

Division/Institute:

05 Veterinary Medicine > Research Foci > NeuroCenter
04 Faculty of Medicine > Department of Intensive Care, Emergency Medicine and Anaesthesiology (DINA) > Clinic and Policlinic for Anaesthesiology and Pain Therapy
05 Veterinary Medicine > Department of Clinical Veterinary Medicine (DKV)
05 Veterinary Medicine > Department of Clinical Research and Veterinary Public Health (DCR-VPH) > Veterinary Anatomy
05 Veterinary Medicine > Department of Clinical Research and Veterinary Public Health (DCR-VPH)
05 Veterinary Medicine > Department of Clinical Veterinary Medicine (DKV) > DKV - Anaesthesiology

UniBE Contributor:

Morath, Ute; Luyet, Cédric; Spadavecchia, Claudia and Stoffel, Michael Hubert

Subjects:

500 Science > 570 Life sciences; biology
600 Technology > 630 Agriculture
600 Technology > 610 Medicine & health

ISSN:

1467-2987

Publisher:

Blackwell Science

Language:

English

Submitter:

Jeannie Wurz

Date Deposited:

04 Oct 2013 14:33

Last Modified:

23 Jan 2018 12:16

Publisher DOI:

10.1111/j.1467-2995.2012.00780.x

PubMed ID:

23057999

Web of Science ID:

000318038900012

URI:

https://boris.unibe.ch/id/eprint/13012 (FactScience: 219513)

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