Long-qt-syndrome Definition
noun
(medicine) A heart disease in which there is an abnormally long delay between the electrical excitation (depolarization) and relaxation (repolarization) of the ventricles of the heart.
Wiktionary
(medicine) A heart disease in which there is an abnormally long delay between the electrical excitation (depolarization) and relaxation (repolarization) of the ventricles of the heart.