Lynne Cox is a world-class open water swimmer, and was the first person to swim the Strait of Magellan and around the Cape of Good Hope. She also swam a mile in the ice-filled waters of Antarctica.
But in 2012, after a series of losses including both of her parents and her beloved dog Cody, Cox suddenly developed atrial fibrillation, later attributed to broken heart syndrome. AFib, as it's known, sometimes has symptoms, such as a fluttering heartbeat. But in other cases, there are none.
Cox writes about her road to recovery in the new memoir "Swimming in the Sink: An Episode of the Heart" and joins Here & Now's Robin Young to talk about the book.
This segment aired on August 31, 2016.