<prompt> Dicrotic notch is due to ?AV valve closureMitral valve closurePulmonary valve closureTricuspid valve closure  <response>: dicrotic notch. : a secondary upstroke in the descending pa of a pulse tracing corresponding to the transient increase in aoic pressure upon closure of the aoic valve. -- called also dicrotic wave Ref Davidson 23rd edition pg 430 