has symptom short QT syndrome MIM:609621 DOID:0050793 MIM:609622 disease_ontology MIM:609620 2013-11-12T12:59:42Z A heart conduction disease that is characterized by heart arrhythmia defined as a short QT interval on an EKG (less than 300 ms) that does not significantly change with heart rate, tall and peaked T waves, and a structurally normal heart. heart conduction disease arrhythmia