title: Endovascular treatment of side wall aneurysms using a liquid embolic agent: a US single-center prospective trial.
abstract: OBJECTIVE
  Onyx HD-500 is a liquid embolic agent consisting of ethylene vinyl alcohol copolymer dissolved in dimethylsulfoxide and mixed with tantalum. This viscous embolic agent was designed to treat intracranial side wall aneurysms, but there have been no prospective published series from the United States. From this early experience, we developed several protocol revisions, technical details, and clinical pearls that have not been published for liquid embolic embolization of aneurysms.
  
  
  METHODS
  We present our single-center prospective series of patients treated with Onyx HD-500 from a multicenter, randomized, controlled trial. Thirteen patients received Onyx HD-500, and their ages ranged from 43 to 81 years. Twelve patients had aneurysms on the internal carotid artery, and 1 patient had an aneurysm the vertebral artery. Every patient had an immediate postangiographic result with 90% or more occlusion by an independent core laboratory assessment. In 1 patient, the Onyx HD-500 injection was aborted, and the aneurysm was embolized with coils. Eleven of 13 patients (85%) underwent 6-month follow-up angiography that demonstrated persistent durable occlusion with no recanalization. There was 1 complication (8%) and no deaths.
  
  
  CONCLUSIONS
  This is the only prospective series of intracranial aneurysms treated with Onyx HD-500 in the United States. This is also the first publication that describes detailed procedure techniques, recommended protocol revisions, lessons learned from early complications, clinical pearls, and advantages and disadvantages of liquid embolic embolization of aneurysms.
authors: Department of Neurological Surgery, Vanderbilt University Medical Center, Nashville, Tennessee 37232-2380, USA.
authors: Scott D
authors: SD
authors: Simon
authors: Eric
authors: E
authors: Eskioglu
authors: Adam
authors: A
authors: Reig
authors: Robert A
authors: RA
authors: Mericle
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D004121:Dimethyl Sulfoxide / Q000009:adverse effects / Q000627:therapeutic use*; D004621:Embolization, Therapeutic / Q000009:adverse effects / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D002532:Intracranial Aneurysm / Q000000981:diagnostic imaging / Q000473:pathology / Q000628:therapy*; D008297:Male; D008875:Middle Aged; D011145:Polyvinyls / Q000009:adverse effects / Q000627:therapeutic use*; D011446:Prospective Studies; D011859:Radiography
chemical_list: C505752:Onyx HD 500; D011145:Polyvinyls; D004121:Dimethyl Sulfoxide