title: Treatment of intracranial aneurysms with hydrogel coated expandable coils.
abstract: BACKGROUND
  Coiling of intracranial aneurysms with platinum coils sometimes results in relatively poor angiographic results which may be is related to low packing volumes achieved. Hydrogel coated expandable coils (HydroCoil) have been shown to achieve better aneurysm volume filling which may potentially result in lower recanalization rates. Currently there is limited clinical data on their safety and efficacy in aneurysm treatment.
  
  
  METHODS
  We analyzed data from a prospectively collected database on patients treated at the Toronto Western Hospital. The analysis included the patients' characteristics, aneurysm size, packing, procedure related complications, recanalization and clinical outcome.
  
  
  RESULTS
  Twenty-nine aneurysms were treated with HydroCoils only or in combination with other coils. The average calculated filling of the aneurysm volume was 74-76%. On the immediate post treatment angiograms, 44% of the berry type aneurysms were completely obliterated, 33% had a residual neck and, in 20%, a residual aneurysm was seen. Follow-up imaging was available in 23 cases. On imaging follow-up (from 2 days to 11 months) one dissecting aneurysm had recanalized. There were six technical/medical complications with no clinical consequences. Two clinically significant procedural related complications occurred.
  
  
  CONCLUSIONS
  HydroCoils can be used effectively to treat intracranial aneurysms. The volume expansion allows for much greater packing than described for bare platinum coils, which may result in better long-term results. The recanalization rate is low but the limited follow-up does not allow for any conclusion regarding the long-term outcome. The complication rate is similar to larger current series using bare platinum coils.
authors.affiliation: Division of Neuroradiology, Toronto Western Hospital, University of Toronto, Ontario, Canada.
authors.forename: Thorsteinn
authors.initials: T
authors.lastname: Gunnarsson
authors.forename: Paula
authors.initials: P
authors.lastname: Klurfan
authors.forename: Karel G
authors.initials: KG
authors.lastname: terBrugge
authors.forename: Robert A
authors.initials: RA
authors.lastname: Willinsky
mesh_terms: D000328:Adult; D000368:Aged; D002533:Cerebral Angiography; D002536:Cerebral Arteries / Q000000981:diagnostic imaging / Q000473:pathology / Q000503:physiopathology; D004621:Embolization, Therapeutic / Q000295:instrumentation* / Q000379:methods*; D005260:Female; D006801:Humans; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate / Q000627:therapeutic use*; D002532:Intracranial Aneurysm / Q000000981:diagnostic imaging / Q000473:pathology / Q000628:therapy*; D008297:Male; D008875:Middle Aged; D010984:Platinum / Q000009:adverse effects; D011183:Postoperative Complications / Q000209:etiology / Q000503:physiopathology / Q000517:prevention & control; D011446:Prospective Studies; D019736:Prostheses and Implants / Q000009:adverse effects / Q000592:standards; D055502:Secondary Prevention; D016896:Treatment Outcome
chemical_list: D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D010984:Platinum