question: Hello doctor,Is it normal to have QT Interval of 320 ms on frequency 76 bpm for a 20-year-old male? Is it possible that my level of calcium is the thing which is shortening my QT? My calcium is 2,54 mmol/L. Is it too less? I still feel something around my heart, mainly when I am in stress. Currently, I am taking Metoprolol. Previously I used to take Amlodipine.