Retrobulbar vs peribulbar regional anesthesia techniques using bupivacaine in dogs

Veterinary Ophthalmology
Yael Shilo-BenjaminiErik R Wisner

Abstract

To compare the effectiveness of retrobulbar anesthesia (RBA) and peribulbar anesthesia (PBA) in dogs. Six adult mixed-breed dogs (18-24 kg). In a randomized, masked, crossover trial with a 10-day washout period, each dog was sedated with intravenously administered dexmedetomidine and administered 0.5% bupivacaine:iopamidol (4:1) as RBA (2 mL via a ventrolateral site) or PBA (5 mL divided equally between ventrolateral and dorsomedial sites). The contralateral eye acted as control. Injectate distribution was evaluated by computed tomography. Following intramuscularly administered atipamezole, corneal and periocular skin sensation, intraocular pressure (IOP), and ocular reflexes, and appearance were evaluated for 24 hours. Comparisons were performed with mixed-effects linear regression (IOP) or the exact Wilcoxon signed rank test (scores). Significance was set at P ≤ .05. Injectate distribution was intraconal in 2/6 RBA- and 4/6 PBA-injected eyes. Eyes undergoing PBA had significantly reduced lateral, ventral, and dorsal periocular skin sensation for 2-3 hours, and significantly reduced corneal sensitivity for 4 hours, relative to control eyes. Chemosis and exophthalmos occurred in 33%-40% of eyes undergoing RBA and 83%-100% eyes ...Continue Reading

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Nov 25, 2014·American Journal of Veterinary Research·Yael Shilo-BenjaminiErik R Wisner
Feb 14, 2015·Veterinary Ophthalmology·Derek W Y ChowHans D Westermeyer

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Citations

Mar 1, 2021·Veterinary Anaesthesia and Analgesia·Vanessa RabbogliattiGiuliano Ravasio
Jul 13, 2020·Veterinary Anaesthesia and Analgesia·Kyle J BartholomewMichael R Lasarev
Aug 12, 2020·Veterinary Anaesthesia and Analgesia·Stephan MahlerClaude Guintard
Jun 20, 2021·Veterinary Anaesthesia and Analgesia·Erin M ScottBradley T Simon
Aug 16, 2021·Veterinary Anaesthesia and Analgesia·Adelaide GrecoLeonardo Meomartino

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