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You would not see a "viable pulsation above the manubrium, which you should not confuse with a "brisk carotid upstroke" associated with aortic stenosis.
"brisk carotid upstroke" is the description of a normal carotid pulse. Aortic stenosis has a slowly rising/late peaking upstroke since the stenosis impedes flow out of the LV.
AS affects the LV first. it isn't until later in the disease progression that there will be a significant enough enlargement of the LA to cause impingement of the LA. By the time the problem was that bad there would also be pulmonary findings of backed-up pressure (in my not so expert opinion).