Same IVUS, Same Vessel, Different FFR

Identifying the functionally significant stenosis is difficult in the setting of several tandem lesions and presence of diffuse disease in a single coronary artery. The same minimum lumen area measured by IVUS may have a different hemodynamic impact depending on the size of the distribution territory. Pull-back FFR recordings are useful when it comes to deciding which are the culprit lesions that require treatment.