By Nico H. J. Pijls, Bernard De Bruyne (auth.)
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32 • Myocardial fractional flow reserve and the results of the exercise ECG correlate better with minimal luminal diameter (which only takes into account one single measurement) than with percent diameter stenosis (taking into account two measurements: minimal diameter and "normal" reference diameter) and than with stenosis flow reserve (which in addition takes into account lesional length). This suggest that multiple measurements, by amplifying the effect of measuring errors, lead paradoxically to a weaker functional depiction of the stenosis.