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What is anacrotic pulse?

Anacrotic pulse is a low volume pulse with slow upstroke, sustained peak and a slow downstroke, also a palpable notch in the ascending limb of pulse.
Cause  of anacrotic pulse
Aortic stenosis - here the percussion wave is delayed beyond the tidal wave. The typical pulse in aortic stenosis is known as pulsus parvus et tardus'
Parvus means low volume 
Tardus means slow or late. 
You  may also feel carotid shudder in the presence of anacrotic pulse