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  • Title: [Fixed subvalvular left ventricular outflow tract obstruction. Comparison of the diagnostic usefulness of mono- and bi-dimensional echocardiography].
    Author: Jacovella G, Pino PG, Salati A, Narducci C, Biffani G, Chidichimo G.
    Journal: G Ital Cardiol; 1981; 11(7):926-32. PubMed ID: 7198068.
    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.
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