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Does the Use of Intratesticular Blocks in Cats Undergoing Orchiectomies Serve as an Effective Adjunctive Analgesic?

Erik Fausak, Elizabeth Rodriguez, Anna Elizabeth Simle, Netwarat Merman, Dakota Cook

Published:  19/10/2018    in:  Knowledge Summaries
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PICO question

In cats undergoing orchiectomy, does the use of intratesticular lidocaine reduce the pain in patients compared to not using intratesticular lidocaine?

Clinical bottom line

With a low grade of evidence, when compared to a pre-medication with pure-µ agonist opioids, intratesticular lidocaine does not appear to provide significant benefit.  However, based on our clinical scenario where pre-medication is with a partial-µ opioid like buprenorphine, there may be benefit in utilising intratesticular lidocaine.

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  1. Fernandez-Parra, R. et al. (2017) ‘Comparison of intratesticular lidocaine, sacrococcygeal epidural lidocaine and intravenous methadone in cats undergoing castration: a prospective, randomized, investigator-blind clinical trial’, Veterinary Anaesthesia and Analgesia. doi:
  2. Huuskonen, V. et al. (2013) ‘Intratesticular lidocaine reduces the response to surgical castration in dogs’, Veterinary Anaesthesia and Analgesia, 40(1), pp. 74–82. doi:
  3. McMillan, M. W., Seymour, C. J. and Brearley, J. C. (2012) ‘Effect of intratesticular lidocaine on isoflurane requirements in dogs undergoing routine castration’, Journal of Small Animal Practice, 53(7), pp. 393–397. doi:
  4. Moldal, E. R. et al. (2013) ‘Intratesticular and subcutaneous lidocaine alters the intraoperative haemodynamic responses and heart rate variability in male cats undergoing castration’, Veterinary Anaesthesia and Analgesia, 40(1), pp. 63–73. doi:
  5. Perez, T. E. et al. (2013) ‘Effects of intratesticular injection of bupivacaine and epidural administration of morphine in dogs undergoing castration’, Journal of the American Veterinary Medical Association, 242(5), pp. 631–642. doi:

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Copyright (c) 2018 Erik Davis Fausak, Elizabeth Rodriguez, Anna Elizabeth Simle, Netwarat Merman, Dakota Cook

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Made possible through a project grant from the RCVS Council.