condition that cause hypercalcemia states like hyperPTH would cause short QT. Do u guys know why? I am not sure how to explain it using electrolytes. My thinking is hyperca causing phase 2 on the ventricular action potential to be longer due ca influx, but i dont know why it would cause shorten QT(mechanical contraction of the ventricle). Maybe because Ca influx cardiomyoctes causing contraction. My problem is i thought hyperCa would make cell less likely to depolarize according to Dr. *******-Pass Program-yet it cause short QT. Can someone explain the connection to me? Thank U.