title: Immediate postoperative angiography after aneurysm clipping--implications for quality control and guidance of further management.
abstract: BACKGROUND
  To determine the impact of postoperative angiography after aneurysm clipping on quality control and further management.
  
  
  METHODS
  A recent consecutive series of n = 296 patients (186 females, 110 males, mean age 51 yrs) who underwent 324 craniotomies to clip 384 aneurysms was reviewed. New irregularities on postoperative angiographies were categorized as unrelated (e. g. vasospasm) or related (= vessel occlusion/residuum) to clipping and expected or unexpected by the surgeon. Therapies prompted by these findings as well as subsequent negative sequelae were analyzed. Factors related to negative events were identified by logistic regression (p < 0.05).
  
  
  RESULTS
  Twenty-six (8%) unrelated findings prompted medical or intravascular therapy. Of 36 (9.4%) clip-related findings (n = 17 occlusions, n = 19 residua), 14 (3.6%) were unexpected (n = 9 occlusions, n = 5 residua). This was followed by 9 (2.3%, n = 4 occlusions, n = 5 residua) clip readjustments and 6 aggressive medical therapies. Nine patients were scheduled for angiographic follow-up, of which in five performed so far no change of aneurysm remnants was noted. Permanent sequelae from vessel occlusion occurred in 9 cases. Major premature rupture (p < 0.005), giant size/fusiform configuration (p < 0.001), posterior circulation aneurysms (p < 0.05) and ophthalmic segment location (p < 0.008) were significantly related to adverse postoperative findings. The use of microvascular Doppler significantly reduced the rate of unexpected vessel occlusion (3.3 vs. 0.9%).
  
  
  CONCLUSIONS
  Apart from the need for quality control in aneurysm clipping--especially with respect to coiling--our results stress the importance of postoperative angiography, because a small, but significant subset of patients will benefit from immediate intervention and/or deserves long-term follow-up.
authors.affiliation: Department of Neurosurgery, University of Bonn. bernhard.meyer@ukb.uni-bonn.de
authors.forename: B
authors.initials: B
authors.lastname: Meyer
authors.forename: H
authors.initials: H
authors.lastname: Urbach
authors.forename: C
authors.initials: C
authors.lastname: Schaller
authors.forename: M
authors.initials: M
authors.lastname: Baslam
authors.forename: J
authors.initials: J
authors.lastname: Nordblom
authors.forename: J
authors.initials: J
authors.lastname: Schramm
mesh_terms: D000792:Angiography / Q000379:methods* / Q000592:standards; D003399:Craniotomy; D005260:Female; D006801:Humans; D002532:Intracranial Aneurysm / Q000000981:diagnostic imaging / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000145:classification / Q000000981:diagnostic imaging*; D011184:Postoperative Period; D011786:Quality Control; D012189:Retrospective Studies