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Intratesticular lidocaine reduces the response to surgical castration in dogs.
MedLine Citation:
PMID:  22994840     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Objective  To investigate whether intratesticular injection of lidocaine pre-surgery would reduce the intraoperative responses to elective castration in dogs. Study design  Double-blinded, randomized, controlled, prospective clinical study. Animals  Forty-two client-owned dogs weighing 2.2-38.4 kg and aged between 4.5 and 56 months. Methods  Group L dogs received an intratesticular injection of 2% lidocaine (2 mg kg(-1) ) and Group S an identical volume of saline prior to surgery. Premedication was with acepromazine and morphine intramuscularly. Anaesthesia was induced with propofol intravenously and maintained with isoflurane vaporized in oxygen. Heart rate (HR), mean arterial pressure (MAP), respiratory rate (f(R) ), end-tidal isoflurane (Fe'ISO) and carbon dioxide concentrations, oxygen saturation and ECG were monitored during surgery. Fe'ISO was maintained at 1.0 ± 0.1%. Supplemental propofol was given in response to gross movement. Results  Group L had significantly lower maximum values for both HR and MAP. Group L displayed significantly smaller increases in HR during exteriorization of the first testis than Group S. There was an overall significant difference in MAP between groups during all surgical events (p = 0.041) and time points (p = 0.002). In univariate analysis, Group L showed significantly less changes in MAP during skin incision, exteriorization of the first testis and clamping of both spermatic cords. Group S reached its highest f(R) significantly earlier. Group L (eight dogs) required additional propofol 33 ± 18 minutes after the start of surgery and Group S (seven dogs) at 19 ± 17 minutes; this difference was not statistically significant. Seven dogs in Group L and 12 dogs in Group S required rescue analgesia with morphine (GCMPS-SF score ≥6); this difference was not statistically significant. No adverse effects were reported postoperatively. Conclusions and clinical relevance  Based on this study, the authors recommend the use of intratesticular lidocaine for surgical castration in dogs.
Authors:
Vilhelmiina Huuskonen; Jm Lynne Hughes; Elisa Estaca Bañon; Eleanor West
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-9-21
Journal Detail:
Title:  Veterinary anaesthesia and analgesia     Volume:  -     ISSN:  1467-2995     ISO Abbreviation:  Vet Anaesth Analg     Publication Date:  2012 Sep 
Date Detail:
Created Date:  2012-9-21     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100956422     Medline TA:  Vet Anaesth Analg     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2012 The Authors. Veterinary Anaesthesia and Analgesia. © 2012 Association of Veterinary Anaesthetists and the American College of Veterinary Anesthesiologists.
Affiliation:
UCD Veterinary Hospital, School of Veterinary Medicine, University College Dublin, Dublin, Ireland.
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