Successful Cardiopulmonary Cerebral Resuscitation Incorporating Defibrillation in a Filly with Neonatal Maladjustment Syndrome Following a Routine Anaesthetic Procedure

SummaryA 10‐h‐old 56‐kg Thoroughbred filly was presented for treatment of partial failure of passive transfer of immunity and presumed neonatal maladjustment syndrome (NMS). The filly was hospitalised, and supportive care initiated. On Day 5 of hospitalisation, seizures were observed and were controlled with IV administration of diazepam. Due to progression of clinical signs of NMS, magnetic resonance imaging of the filly's brain was performed. During the early anaesthetic recovery period, the filly exhibited cardiopulmonary arrest (CPA) at which point cardiopulmonary cerebral resuscitation (CPCR) was performed for a total of 48 min. During this time, ventricular fibrillation (VF) was observed on ECG and the filly was defibrillated three times at 1–2‐min intervals using 2–4 J/kg of monophasic electrical defibrillation. The filly successfully recovered from CPCR, was discharged 5 days later and was reported healthy 12 months post‐discharge.