Levine grading scale:
Systolic
Holosystolic blowing murmur heard best at the apex radiating to the axilla
Mitral regurgitation
Short systolic murmur that decreases with squatting
Mitral regurgitation
Crescendo-decrescendo
May radiate to the carotids
Aortic stenosis
Heard along L sternal border without carotid radiation
HOCM (especially in a young patient)
Not otherwise specified is also consistent with
Pulmonary valve stenosis
Mid-systolic click over cardiac apex
Mitral valve prolapse
Diastolic
Early
Aortic regurgitation (mild)
Late-diastolic rumble at the apex
Mitral stenosis
Mid-distolic opening-snap
Mitral stenosis
Mid-diastolic rumble at the apex
Intracardiac tumor obstructing the mitral valve
Holodiastolic
Aortic regurgitation (severe)