Different T wave morphologies in affected members of the same family. The proband had a documented cardiac arrest as first manifestation of LQTS. The basal ECG shows deep negative T waves in the precordial leads and a very prolonged QTc. His sister is still asymptomatic with typical bi-phasic T waves. His father, with notched T waves and a QTc 584 ms, has had 2 syncopal episodes. The arrows point to examples of notched T wave. [Reprinted from: Schwartz PJ, Priori SG, Napolitano C: The long QT syndrome. In: CARDIAC ELECTROPHYSIOLOGY. FROM CELL TO BEDSIDE. III EDITION (Zipes DP and Jalife J, Eds.) WB Saunders Co., Philadelphia, pp. 597–615, 2000 – with permission from Elsevier].