title: Heart rate acceleration without changes in the QT interval and severe ventricular tachyarrhythmias: a variant of the long QT syndrome?
mesh_terms: D004562:Electrocardiography; D005260:Female; D006339:Heart Rate; D006352:Heart Ventricles / Q000503:physiopathology; D006801:Humans; D008875:Middle Aged; D013577:Syndrome; D013610:Tachycardia / Q000503:physiopathology*