Which of the following statement is wrong about hyperophic cardiomyopathy ?

Hyperophic Cardiomyopathy Interventricular septum typically shows maximum hyperophy 30% cases show obstruction at rest while other 30% show when put on exercise . Enlarged mitral valve pushesh against spetum and adaptation later may result in posteriorly directed mitral regurgitation Harsh ejection systolic murmur is observed