Long QT Syndrome Long QT Syndrome prolongation of the QT interval Medscape: Medscape Access emedicine.medscape.com http://emedicine.medscape.com/article/157826-overview شرح عن مرض طول فترة QT Long QT Syndrome – Medscape http://emedicine.medscape.com/article/157826-overview síndrome de QT prolongado http://emedicine.medscape.com/article/157826-overview Medscape Reference long QT syndrome síndrome de QT prolongado eMedicine