My sister, a year younger than me just died at the age of 59 from a fatal heart attack. We "thought" that she was fit as a fiddle, athlete caliber. I am facing surgery and had an EKG that showed my QT to be at 424. Is that a reasonable number or of concern? Of note here....my Dad as well as 3 of his brothers died the same same sudden death.......no previous warning all "fit" or so we thought.