There are three electrocardiographic patterns associated with<unk>  syndrome: Type I, Type II and Type III. The diagnosis of<unk>  syndrome is based upon the presence of Type I EKG changes.  Patients with Type II or Type III<unk>  patterns can convert to a Type I<unk>  pattern following the administration of sodium channel blockers such as ajmaline and flecainide.  To be classified as having<unk>  syndrome (not just the pattern), one or more of the following criteria must also be met:
Family history of sudden cardiac death (SCD) (<45 years old)
Documented ventricular fibrillation (VF)
Polymorphic ventricular tachycardia
Coved-type ECG changes in family members
Inducibility of ventricular tachycardia (VT) with programmed electrical stimulation (PES)
The patient is also diagnosed as having<unk>  syndrome when a Type 2 (saddleback pattern) or Type 3 ST-segment elevation is observed in more than one right precordial lead under baseline conditions that can be converted to the diagnostic Type 1<unk>  pattern following administration of a sodium channel blocker and the clinical criteria listed above are met as well.
Brugada syndrome classification
Cowden syndrome classification
Boerhaave syndrome classification
Brugada syndrome diagnostic criteria
Brugada syndrome physical examination
Blind loop syndrome classification
Barter Syndrome classification
Guillain-Barré syndrome electrocardiogram