Echocardiographic demonstration of pericardial fluid adjacent to the right atrial wall.
D000328:Adult; D000368:Aged; D004452:Echocardiography; D005260:Female; D006325:Heart Atria; D006801:Humans; D008297:Male; D008875:Middle Aged; D010490:Pericardial Effusion / Q000175:diagnosis*; D011446:Prospective Studies