title: [Fixed subvalvular left ventricular outflow tract obstruction. Comparison of the diagnostic usefulness of mono- and bi-dimensional echocardiography].
abstract: Because Cross-Sectional Echocardiography offers the advantage of correct spatial orientation, it is said to permit a more exact localization of the level of the outflow tract obstruction and a determination of the nature of the lesion. Our experience confirms that B-Mode Echo is more reliable in diagnosing an extensive sub-valvular narrowing, while the existence of a thin sub-valvular membrane can also be detected by M-Mode examination. The latter has moreover proven very useful in that it records indirect signs of obstruction, such as a mid-systolic closure of the aortic cusps. We therefore suggest that both methods should be employed in studying these patients.
mesh_terms: D001020:Aortic Stenosis, Subvalvular / Q000175:diagnosis*; D002312:Cardiomyopathy, Hypertrophic / Q000175:diagnosis*; D004452:Echocardiography; D006801:Humans
vernacular_title: Ostacolo all'efflusso del ventricolo sinistro sottovalvolare fisso. Confronto tra utilità diagnostica della ecocardiografia mono-bidimensionale.