The first-pass effect, defined as a complete or near-complete recanalization after one pass of a mechanical thrombectomy device, has been associated with better clinical outcomes than recanalization requiring more than one pass in acute ischemic stroke. This webinar will discuss the hows and whys of the first-pass effect. Original Presentation Date: 1/19/2022 Featuring Joseph Gemmete, MD, FSIR, FACR, FCIRSE, FAHA Moderated/Organized by Ahmad Amer --- The Society of Interventional Radiology (SIR) Resident, Fellow, and Student (RFS) Section regularly organizes live, interactive webinars that are free for in-training members, which you can find on our Youtube channel. For more information on the SIR RFS organization, please visit: rfs.sirweb.org