title: Sixteen-year single-surgeon experience with coil embolization for ruptured intracranial aneurysms: recurrence rates and incidence of late rebleeding. Clinical article.
abstract: OBJECTIVE
  Over a 16-year period, 570 patients presenting with acute aneurysmal subarachnoid hemorrhage were successfully treated using endosaccular coil embolization within 30 days of hemorrhage by a single surgeon. Patients were followed to assess the stability of aneurysm occlusion and its longer-term efficacy in protecting against rebleeding.
  
  
  METHODS
  Patients were followed for 6 to 191 months (mean 73.7 months, median 67 months) by clinical review, angiography performed at 6 and 24 months posttreatment, and questionnaires sent via the postal service every 5 years. Late rebleeding was defined as > 30 days after treatment.
  
  
  RESULTS
  Stable angiographic occlusion was evident in 74.5% of small, 72.2% of large, and 60% of giant aneurysms. Recurrent filling was found in 119 (26.3%) of 452 aneurysms. Rebleeding was diagnosed in 9 patients (6 treated aneurysms) and occurred between 2 and 114 months posttreatment. It was due to aneurysm recurrence in 6 patients, rupture of a coincidental untreated aneurysm in 2 patients, and rupture of a de novo aneurysm in 1 patient. Rebleeding occurred in 3 (2.5%) of 119 unstable aneurysms and in 3 (0.9%) of 333 stable aneurysms, as seen on initial follow-up angiography studies. Annual rebleeding rates ranged from 0.2% to 0.6% for all causes and from 0.2% to 0.4% for rebleeding of treated aneurysms. No rebleeding was recorded after the first decade, with 138 patients having more than 10 years of follow-up.
  
  
  CONCLUSIONS
  Periodic follow-up with angiographic studies after coil embolization is recommended to identify aneurysm recurrence and patients at a high risk of late rebleeding in the medium term. More frequent follow-up is recommended for patients harboring coincidental unruptured aneurysms.
authors.affiliation: Nuffield Department of Surgery, University of Oxford, Oxford, United Kingdom.
authors.forename: R Scooter
authors.initials: RS
authors.lastname: Plowman
authors.forename: Alison
authors.initials: A
authors.lastname: Clarke
authors.forename: Mike
authors.initials: M
authors.lastname: Clarke
authors.forename: James V
authors.initials: JV
authors.lastname: Byrne
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D017542:Aneurysm, Ruptured / Q000473:pathology / Q000601:surgery*; D002533:Cerebral Angiography; D015331:Cohort Studies; D004621:Embolization, Therapeutic; D057510:Endovascular Procedures; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D002532:Intracranial Aneurysm / Q000473:pathology / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D018579:Patient Selection; D012008:Recurrence; D012086:Reoperation; D013345:Subarachnoid Hemorrhage / Q000601:surgery; D016896:Treatment Outcome; D055815:Young Adult