title: [Ultrastructural changes to the heart muscle in small interventricular septal defects].
mesh_terms: D000293:Adolescent; D000375:Aging / Q000473:pathology; D001706:Biopsy; D002648:Child; D006345:Heart Septal Defects, Ventricular / Q000473:pathology*; D006801:Humans; D008854:Microscopy, Electron; D009206:Myocardium / Q000648:ultrastructure*
vernacular_title: Ul'trastrukturnye izmeneniia myshtsy serdtsa pri nebol'shikh defektakh mezhzheludochkovoĭ peregorodki.