Описано наблюдение случая фибрилляции предсердий и желудочковой экстрасистолии у пациентки с пролапсом митрального клапана и митральной аннулярной дизъюнкцией. Дебют нарушений ритма инициирован перенесенной новой коронавирусной инфекцией. Кроме того, в анамнезе пациентки комбинированное лечение рака левой молочной железы, способствовавшее появлению фиброза миокарда в качестве аритмогенного субстрата. В связи с неэффективностью консервативной антиаритмической терапии была выполнена радиочастотная катетерная процедура по поводу симптомной фибрилляции предсердий, оказавшаяся безуспешной. Цель статьи — представить возможные причины возникновения нарушений ритма сердца и роль магнитно-резонансной томографии в диагностике аритмогенного фиброза миокарда и митральной аннулярной дизъюнкции.

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