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. 2023 Sep 8;25(10):729–740. doi: 10.1007/s11883-023-01144-9

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Fig. 3 — Doppler wire tracing. A Doppler-tipped guidewire allows direct measurement of coronary flow velocity. Doppler peak flow velocities are averaged over three consecutive heartbeats at rest and during hyperemia to calculate resting and hyperemic average peak velocities, respectively