you'll hear their story at 4:30 p.m. eastern time on "sanjay gupta md." >>> next, we'll have some stories that will leave a smile on your face. find out why these dogs made some folks in illinois very happy. [ male announcer ] this is jim, a man who doesn't stand still. but jim has afib, atrial fibrillation -- an irregular heartbeat, not caused by a heart valve problem. that puts jim at a greater risk of stroke. for years, jim's medicine tied him to a monthly trip to the clinic to get his blood tested. but now, with once-a-day xarelto®, jim's on the move. jim's doctor recommended xarelto®. like warfarin, xarelto® is proven effective to reduce afib-related stroke risk. but xarelto® is the first and only once-a-day prescription blood thinner for patients with afib not caused by a heart valve problem. that doesn't require routine blood monitoring. so jim's not tied to that monitoring routine. [ gps ] proceed to the designated route. not today.