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A 19‐year‐old Cob mare with atrial fibrillation (AF) presented for transvenous electric cardioversion (TVEC). Under general anaesthesia, three successive incremental electric shocks were given (total 750 J) and sinus rhythm was temporarily restored. After 13 s, AF recurred so a fourth shock (300 J) was given and intravenous (IV) amiodarone started. Shortly after, capnography revealed an acute drop...