I'm just curious, I work on a cardiac/medical floor and last night I had a patient admitted for observation after having a stent placed in the cardiac cath lab. He was on tele and running sinus brady. During the night his QT interval lengthened to .52 from .44 earlier in the evening. Is this something you would call the cardiologist about? I researched whether he was on any medications that would cause this and he wasn't. I'm a new nurse on the cardiac floor and am having a hard time figuring out when something is serious enough to call about.