How can athletes play with ICDs, and what happens when it goes off?

The need for an ICD - which is around half the size of a mobile phone - to be fitted can be caused by a variety of different health conditions, including heart failure, coronary heart disease, and arhythmias. Depending on the exact illness an athlete is suffering from, a return to competition is possible. "All cases are individual," says Dr. Amanda Lahti, a doctor and researcher in sports medicine. …