Two of four patients with ballooning posterior leaflet syndrome died suddenly and the remaining two developed a near-fatal arrhythmia. These four patients demonstrate the potentially fatal nature of the ballooning posterior leaflet syndrome.
Shappell SD, Marshall CE. Ballooning Posterior Leaflet SyndromeSyncope and Sudden Death. Arch Intern Med. 1975;135(5):664–667. doi:10.1001/archinte.1975.00330050038005
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