atrial echo

a·tri·al ech·o

electrical reactivation of the atrium by a retrograde impulse returning from the A-V node while the antegrade impulse continues to the ventricle; characterized electrocardiographically, by a pair of P waves enclosing a QRS complex, the second P wave being opposite in polarity (usually inverted in lead II), indicating that it is the reverse (the retrograde pathway) of the pathway of the first P wave (the antegrade pathway).
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1,2) TEE is considered superior to transthoracic echocardiography in detecting potential sources of cardiac emboli such as patent foramen ovale (PFO), atrial septal aneurysm, left atrial echo contrast, and left atrial clot.
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