"Doctors writing in the journal BMJ Case Reports describe the case of a healthy 55-year-old man in India who developed serious heart problems several weeks after being attacked by a swarm of bees. While walking in a forest, he suffered more than 50 stings, and he was admitted to hospital with facial puffiness, breathlessness and sudden tiredness. He had no history of heart problems and heart tests were normal. After initial treatment, his condition improved and he was discharged with anti-inflammatory medication. But around three weeks later, he was back in hospital after developing a dangerously slow heart rate, repeated fainting, and suffering a cardiac arrest. He almost died. ...."
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BMJ Article here: BMJ Case Reports