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Challenges resistance-only RI interpretation in vascular imaging; leaves open validation of impedance index for diagnostics.
The RI is misnamed and should actually be called the "impedance index" because resistance and compliance interact to alter the Doppler arterial waveform. A greater understanding of this relationship may enable future studies that take both resistance and compliance into account to better detect pathologic conditions.
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Bude et al. (1999) studied this question.
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