The applications of sub-Tenon's anaesthesia for canine ophthalmic surgery : a thesis presented in fulfilment of the requirements for the degree of Master of Veterinary Science (MVSc) at Massey University, Manawatu, New Zealand
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Date
2016
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Massey University
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Abstract
Sub-Tenon's anaesthesia is an indispensable anaesthetic technique in human ophthalmic
surgery. It produces highly effective regional anaesthesia and has a significantly lower
complication rate than the previously used peribulbar and retrobulbar injections. Although this
technique has potential application to veterinary ophthalmology it has not yet been reported
in clinical cases. This thesis reviews the literature that references local anaesthesia for ocular
surgery in human and veterinary ophthalmology. A sub-Tenon's block technique that was
specifically developed for use in dogs is also described. This technique is assessed with a
prospective controlled clinical study testing this technique across a variety of ocular surgeries
including enucleation, intrascleral prosthesis, keratectomy with a third eyelid flap and cataract
surgery. The effect of sub-Tenon's anaesthesia on specific parameters was recorded and
compared to the controls such as; globe position and rotation, pupillary dilation, general
anaesthetic monitoring parameters, intraocular pressure, vitreal expansion and post-operative
pain scores. Analysis of these parameters has indicated that sub-Tenon's anaesthesia was an
effective option for controlling post-operative pain when used in conjunction with systemic
analgesics and was an excellent alternative to systemic neuromuscular blockade for canine
cataract surgery.
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Dogs, Surgery, Veterinary anaesthesia, Veterinary ophthalmology, Research Subject Categories::VETERINARY MEDICINE::Surgery