a huge right atrial myxoma(passive) caused byright atrial outflow obstruction
membranous septal aneurysmcausingsevere right ventricular outflow tract obstruction
the main pulmonary arterycausingright ventricular out flow tract obstruction
interventricular muscle contraction , which in turn leads to the Venturi effect that causes systolic anterior motion ( SAM ) of anterior mitral leaflet ( AML(passive) is caused byventricular outflow tract ( LVOT ) obstruction