In hypertrophic cardiomyopathy patients without severe septal hypertrophy, mitral valve and papillary muscle abnormalities contribute to LVOT obstruction, suggesting a potential need for adjunctive surgical procedures beyond myectomy.
MV/PM abnormalities may contribute to obstruction in mild septal HCM; hypothesis-generating for adjunctive procedures.
In hypertrophic cardiomyopathy patients without significant LV hypertrophy, in addition to basal septal thickness, anterior MV length, abnormal chordal attachment, and bifid PM mobility are associated with LVOT obstruction. In such patients, additional procedures on MV and PM (±myectomy) could be considered.
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Patel et al. (2015) studied this question.
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