女,28岁。自1978年6月以来,间常发作突然昏厥、抽搐、面色苍白,无口吐白沫或二便失禁现象;每次均因精神刺激或情绪激动而诱发。曾三次住院,于发作时作心电图曾两次描记到频发室性早搏、短阵扭转型室速,Q—T间期明显延长(0.52～0.58秒)。多次检查血钾正常。 Female, 28 years old. Since June 1978, an intermittent episode of sudden onset of syncope, convulsions, paleness, vomiting without foam or incontinence has been induced by mental or emotional excitement each time. Had three hospitalizations, at the time of the electrocardiogram for two traced to frequent ventricular premature beats, short reverse torsional VT, Q-T interval was significantly longer (0.52 ~ 0.58 seconds). Multiple checks of serum potassium normal.