<unk>  is defined as<unk><unk>  in the absence of clinical or echocardiographic findings of cardiopulmonary disease including hypertension. Patients in this group are generally young individuals (less than 60 years old).
Lone atrial fibrillation
Second degree AV block
AV reentrant tachycardia
Third degree AV block
Second degree AV block laboratory findings
Ventricular flutter
AVNRT
Wide complex tachycardia