Background: Priapism refers to prolonged erection unrelated to sexual stimulation, with severe sequelae unless treated. In humans, it is a rare complication associated with epidural or spinal opioid administration. Its pathophysiology is unclear. This is the first report of priapism following neuraxial anaesthesia in dog.
Case Description: An intrathecal morphine injection (30 mcg/kg) at L5-L6 for postoperative analgesia was given at the end of surgery for multiple cutaneous mastocytoma of the abdomen and left axillary lymphadenectomy. Painless penile erection occurred 2 hours later and lasted 6 hours, before spontaneously resolving 7 to 8 hours after the injection. No pain or other adverse events (e.g., nausea, urinary retention, itching) were recorded. Recovery was complete without treatment.
Conclusion: Painless, self-resolving priapism is a rare complication associated with intrathecal morphine injection in dogs.
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