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Atrial fibrillation (AF) and atrial flutter (AFL) are strong atrial thrombosis (THR) risk factors. In recent-onset tachyarrhythmias, the incidence of left atrial appendage (LAA) THR, detected by transesophageal echocardiography (TEE), has been widely studied, ranging from 6% to 18% (AF) and 4% to 11% (AFL). On the contrary, few studies have assessed right atrial appendage (RAA) THR, and there is no information on the relation between the RAA flow characteristics and the presence of RAA THR. The aims of this study were to evaluate the incidence of RAA THR in a population of patients undergoing TEE-guided cardioversion for recent-onset atrial tachyarrhythmias and to analyze RAA Doppler flow and its relation to thrombus formation.

From 1998 to 2012, patients admitted to the emergency department for persistent, non-self-terminating atrial tachyarrhythmia lasting >2 days who gave informed …