<prompt> Pulsus paradoxus is characteristically seen in cardiac tamponade. Absence of pulsus paradoxus is seen when cardiac tamponade is associated with all except oneASDVSDMRAR  <response>: Mechanism of pulsus paradoxus:Inspiration increased RV filling and decreased LV filling left shift of IVS LV compression and decreased systolic arterial pressure.Pulsus paradoxus is absent when cardiac tamponade occurs in a condition which permits equal filling of both ventricles or more filling of LV.ASD equal filling of both ventricles in both phases of respiration.VSDfree communication between ventricles preventing differential filling.AR filling of LV is maintained irrespective of respiration 