The c deflection is known by the bulging of tricuspid into the right atrium during isovolumetric systole .
The upward deflections are the `` a '' ( atrial contraction ) , `` c '' ( ventricular contraction and resulting bulging of bicuspid into the left atrium during isovolumetric systole ) and `` v '' = atrial venous filling . *
Jugular venous pressure