title: Negative contrast echocardiography: a new method for detecting left-to-right shunts.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D003287:Contrast Media / Q000494:pharmacology; D003326:Coronary Circulation; D004452:Echocardiography; D005260:Female; D006344:Heart Septal Defects, Atrial / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008875:Middle Aged
chemical_list: D003287:Contrast Media