title: Two-level left ventricular outflow balloon dilation: sequential therapeutic approach.
mesh_terms: D000800:Angioplasty, Balloon / Q000379:methods; D001017:Aortic Coarctation / Q000628:therapy*; D001024:Aortic Valve Stenosis / Q000628:therapy*; D006328:Cardiac Catheterization; D002648:Child; D006801:Humans; D007231:Infant, Newborn; D008297:Male