In this task, you will be given a single sentence or a set of sentences. You have to recognize the name of the disorder or disease. Disease is a disorder of structure or function in a human, animal, or plant, especially one that produces specific symptoms or that affects a specific location and is not simply a direct result of physical injury. Although there might be several correct answers, you need to write one of them.

 dl - Sotalol preferentially prolonged action potential duration ( APD ) in M cells dose - dependently ( 1 to 100 micromol / L ) , leading to QT prolongation and an increase in TDR .
QT prolongation