Snapshot A 64-year-old woman presents to the emergency room for several hours of lightheadedness and palpitations. Her past medical history includes hypertension, mitral valve regurgitation, and chronic obstructive pulmonary disease. On physical exam, her pulse is around 150/min. An electrocardiogram is administered, revealing a narrow complex tachycardia and sawtooth-like waves in leads II, III, and aVF. Introduction Clinical definition login to view 3 more bullets Associated conditions login to view 5 more bullets Epidemiology Risk factors login to view 2 more bullets Etiology Pathogenesis login to view 1 more bullet Presentation Symptoms login to view 4 more bullets Physical exam login to view 2 more bullets Imaging Transthoracic echocardiography (TTE) login to view 3 more bullets Studies Electrocardiogram (ECG) login to view 7 more bullets Adenosine administration login to view 4 more bullets Making the diagnosis login to view 1 more bullet Differential Atrial fibrillation login to view 2 more bullets Multifocal atrial tachycardia (MAT) login to view 2 more bullets Treatment Management approach login to view 2 more bullets Medical login to view 20 more bullets Non-operative login to view 3 more bullets Operative login to view 5 more bullets Complications Embolization Heart failure Prognosis Depends on underlying comorbidities