Severity of mitral stenosis is assessed by
Ref Harrison 19 th ed pg 1540 In general, the duration of this murmur correlates with the severity of the stenosis in patients with preserved CO. In patients with sinus rhythm, the murmur often reappears or becomes louder during atrial systole (presystolic accentuation).
Loud opening snap
Length of murmur
Loud S1
Splitting S2
General anatomy