What is seen in severe AS –
Pulsus bisferiens
Late ejection systolic click
Heaving shifted apex
Loud S2
Signs of severe aortic stenosis 

Narrow pulse pressure —> Narrower the pulse pressure, more severe the AS.
Systolic thrill in the second left intercostal space.
Later the peak of ejection systolic murmur, severe the AS.
Parodoxically split S.
Presence of S3 or S4.
ST and T changes on ECG.
Cardiomegaly on x-ray.