Yttrium-90 Infusion: Incidence and Outcome of Delivery System Occlusions during 885 Deliveries.

To evaluate the incidence, cause, and management of delivery system occlusions during yttrium-90 ((90)Y) microsphere infusions and to identify techniques to prevent occlusions.A retrospective review was conducted of 885 consecutive radioembolization deliveries during 820 procedures (some with multiple deliveries) in 503 patients (mean age, 65 y; 293 male) performed between June 2001 and July 2013 at a single academic tertiary care hospital. Occlusions were reported prospectively, and procedural details were reviewed. Statistical analysis assessed associations between catheter occlusions and patient and procedural characteristics.Of 885 (90)Y microsphere deliveries, 11 resulted in occlusion (1.2%). Five occlusions were associated with contained leakage of radioactive material, and one was associated with a spill. Treatment was completed in the same day in 10 patients; repeat catheterization was required in five patients. One patient returned 1 week later to complete treatment. Occlusions were more frequent with deliveries of resin (11/492; 2.2%) versus glass (0/393; 0%) microspheres (P = .002). Occlusions were more likely to occur within the proximal portion of the delivery apparatus (P = .002). There was no significant relationship with any patient characteristics, and there was no improvement with operator experience. The most common cause of occlusion was resin microsphere delivery device failure.(90)Y microsphere delivery device occlusion is uncommon but does occur with resin microspheres. Understanding causes and how to troubleshoot can limit the incidence and detrimental effects.