Long PR, short QT question

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Melkor

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So, I was just trying to figure out why things like hypercalcemia will cause a prolonged PR and a shortened QT. I'm a little rusty on cardio stuff so I was just trying to relate it to what I know about the different phases for cardiac APs for both ventricular and pacemakers but couldn't come up with anything. Anyone mind going through the reason behind this?
 
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