Stopping warfarin for a cystoscopy probably led to my Dad's death. I was not a warfarin specilaist at the time and was not living near him, so I can only say probably. I think that he got a clot in his leg when the warfarin was stopped and the clot went to his lung and killed him. He only lived long enough to say to my Mom, "I don't feel good." and he collapsed to the floor and was dead.