Kim H. Parker added begin_quote_section_The_Instantaneous__.tex  almost 9 years ago

Commit id: 41c9ae394b7b0404dea97694dd5785e1746b153d

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\begin{quote}  \section{The Instantaneous Wave-Free Ratio}  The iFR is the ratio of pressure and flow in the latter 75\% of diastole. Although originally proposed for the coronary circulation,17,18 we illustrate its principles here for the systemic arterial tree. \textbf{[C12]}  The iFR again finds its origin in WIA with its assumed wave-free period. The extra assumption is that in this period, when pressure equals diastolic pressure and flow is negligible, their instantaneous ratio thus $P^m(t)/Q^m(t)$ and averaged diastolic $P^m$ and $F^m$ are measures of (minimal, vasodilated) resistance. \textbf{[C13].}  \end{quote}