Fractional flow reserve (FFR) is a well-established method to assess the hemodynamic and clinical significance of intermediate coronary artery stenoses. Ostial coronary lesions present a particular challenge to FFR measurements, as the guide needs to be positioned outside the artery during normalization and hyperemia measurements. Utilization of a “buddy wire” can help maintain stability of the coronary guide to facilitate FFR measurements of ostial coronary lesions.
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