Reverse split S2 is seen in?

Reverse split S2 implies aoic valve closes very late to a level that it closes after the pulmonary valve closure (Normally aoic valve closes first and then pulmonic valve). Severe aoic stenosis -Valvular obstruction makes the work of left ventricle harder. The longer ejection time leads to delayed closure of aoic valve. Due to this delayed closure the split becomes narrowed in mitral stenosis, loud S1 is heard.