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\subsubsection{The Reservoir Pressure is a Wave and Equals Twice  the Backward Wave}  The RWC assumes that Pm=P +P or P =Pm-P and  res excres exc  experimental data show P =Z Qm ,32,36 thus P =Pm-Z Qm, and  exc cres c  WSA (Equation 1) gives Pb=(Pm-ZcQm)/2 thus reservoir pressure  is P =2Pb .  res  Also in diastole Pb=Pf and P =2Pb=Pb+Pf and  res  Q=Qf+Qb=(Pf-Pb)/Z =0 thus ascending aortic flow in dias  res c  tole is zero, as discussed above. Indeed, P res is a wave equal  to 2Pb and in diastole the sum of P =Pf+Pb. Hametner et al40  res  have shown in patients that indeed P res=2.01Pb , r2=0.94.  When the reservoir pressure is derived at different locations,  it is found that it arrives later in the distal aorta,22 as  also explained by P =2Pb. The wave property of P was also  res res  shown by Mynard41,42 where they concluded that. “…foot of  P res clearly constituting a propagated disturbance, or by definition,  a wave”.