Management of Right Atrial Enlargement

Initial Diagnostic Evaluation

Comprehensive transthoracic echocardiography is the diagnostic test of choice to document severity of right-sided cardiac enlargement, right ventricular dysfunction, and tricuspid regurgitation, according to the American Heart Association 2, 1
ECG findings may reveal characteristic patterns including tall peaked P waves, right axis deviation, and right bundle-branch block pattern, as noted by the American College of Cardiology 2, 3
Chest radiography typically demonstrates right atrial enlargement with a "globular" cardiac contour and clear lung fields, as reported by the American Heart Association 2, 1
Transesophageal echocardiography should be performed before cardioversion to exclude atrial thrombus, particularly in patients with atrial fibrillation, as recommended by the American Heart Association 2, 4
Cardiac MRI or CT provides additional structural and functional information when echocardiography is insufficient, according to the American College of Cardiology 5, 4, 1

Anticoagulation with warfarin is mandatory for patients with right atrial enlargement and history of paradoxical embolus or atrial fibrillation, as the large right atrium predisposes to thrombus formation, according to the American Heart Association 2
Transcatheter or surgical closure is indicated for secundum ASDs causing significant right atrial/ventricular enlargement with left-to-right shunt, provided pulmonary artery pressure is less than 50% of systemic pressure, as recommended by the American College of Cardiology 1
Tricuspid valve repair is preferred over replacement when feasible in Ebstein's anomaly, according to the American Heart Association 2, 1
Aggressive strategy for maintaining sinus rhythm is warranted for atrial fibrillation management because of the association with progressive heart failure, mortality, and stroke, as noted by the American College of Cardiology 6
Anticoagulation with warfarin should have a low threshold for initiation—even one or two episodes of paroxysmal atrial fibrillation warrant anticoagulation due to increased thromboembolism risk, according to the American College of Cardiology 6, 2

The enlarged right atrium creates stasis predisposing to thrombus formation, particularly with atrial fibrillation, as reported by the American Heart Association 2
Warfarin is superior to aspirin for thromboembolism prevention, though it does not completely abolish stroke risk, according to the American College of Cardiology 6
Patients with right atrial enlargement or prior atrial surgical incisions are at highest risk for intra-atrial reentrant tachycardia, as noted by the American Heart Association 5, 3

Regular clinical assessment and echocardiography to monitor disease progression and treatment response, as recommended by the American College of Cardiology 1
Patients with congenital heart disease should have follow-up in specialized adult congenital heart disease centers, according to the American College of Cardiology 1
Holter monitoring is indicated for patients at risk for arrhythmias, as noted by the American College of Cardiology 1
Prognosis depends on underlying etiology, severity of right ventricular dysfunction, and treatment response, according to the American College of Cardiology 1