Suspect in any patient with ventricular rate >300
Many are asymptomatic
Irritability, feeding intolerance
CHF
Intercurrent febrile illness
Chest pain, palpitations
Shortness of breath
Syncope/near-syncope
Sudden onset "racing heart"
Wolff–Parkinson–White syndrome
Regular
Wernicke-Korsakoff syndrome
AV Node Independent
Vaughn Jackson syndrome
Sinus tachycardia
Sydenham's chorea
Atrial tachycardia 