= Reflection of an arterial pressure wave
{title2=$p_-/p_+=(RY-1)/(RY+1)$}
= Arterial wave reflection
{synonym}
A <hydraulic resistance> $R$ imposes $q=p/R$. Combining this with forward and backward <arterial pressure waves>, $p=p_++p_-$ and $q=Y(p_+-p_-)$, gives the displayed <reflection coefficient>. A matched load $RY=1$ has no reflected <pressure> wave, while a closed end has <reflection coefficient> one. At a network junction the combined downstream input admittance replaces $1/R$.
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