Studies on the efficacy of Sub-Tenonâ s anaesthesia as an adjunct to general anaesthesia for ocular surgery in dogs
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Date
2021
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Guru Angad Dev Veterinary and Animal Sciences University, Ludhiana
Abstract
The present study was conducted on 16 dogs with cataract or pigmentary keratitis to evaluate the efficacy of Sub-Tenonâ s anaesthesia as an adjunct to general anaesthesia. The age of dogs was between 0.5-11 years and weighed between 7-65 kgs. The dogs were divided into 2 groups [Group I (GA) and Group II (GA + STA)] with 8 dogs in each group. No significant change in IOP was observed after application topical mydriatics or Sub-Tenonâ s anaesthesia. Mean volume of local anaesthetic used for Sub-Tenonâ s anaesthesia was 3.28± 0.23 ml. Topical mydriatics were used to dilated pupil in Group I cases. Akinesia was present in all cases after application of Sub-Tenonâ s anaesthesia in Group II while stay sutures were used in Group I. Mydriasis quality was excellent in 4 cases, good, fair and poor in one case each in Group I & excellent in 7 out of 8 cases in Group II. The mean ± SE time for onset of mydriasis with Sub-Tenonâ s anaesthesia was 4.6± 0.45 minutes. Mean ± SE values for Isoflurane concentration (%) (P=0.005), Pulse rate (P=.009) and MAP (P=0.009) for Group I were significantly higher from Group II. Intra-operative analgesia was superior in Group II as compared to Group I. Modified Melbourne pain score values were significantly higher after recovery (P=0.02) and 6 hours (P=0.01) post-operatively in Group I. Significant rise in cortisol levels from baseline at 6 hours post-operatively was noted in Group I as compared to Group II (P=0.01). Thus, it can be concluded that Sub-Tenonâ s anaesthesia provided proper akinesia, adequate mydriasis, reduced isoflurane requirements, provided adequate intra-operative and post-operative analgesia and is a safe regional anaesthetic technique for cataract surgery/superficial keratectomy.
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