Table 1:

Summary of data describing the number and incidence of thromboembolic and perforation events during unassisted and balloon-assisted coiling of cerebral aneurysms

Variable% Incidence ± SDNo. of EventsNo. of AneurysmsNo. of ArticlesOdds RatioConfidence Interval
Thromboembolic incidence, all articles, balloon8.1 ± 5.72227311NANA
Thromboembolic incidence, all articles, no balloon8.0 ± 5.76986717
Thromboembolic incidence, “mixed articles,” balloon7.9 ± 6.178950.70.3-1.7
Thromboembolic incidence, “mixed articles,” no balloon10.5 ± 8.4363445
Perforation incidence, balloon SAH cases1.7 ± 9.41597NANA
Perforation incidence, nonballoon SAH cases3.4 ± 6.31750713
Perforation incidence, balloon non-SAH cases1.8 ± 2.121118NANA
Perforation incidence, non-balloon non-SAH cases1.4 ± -2.3748612
  • Note:—“Mixed articles” indicates studies reporting results for both balloon-assisted and unassisted coiling cases and were the ones subject to meta-analysis. The incidence of thromboembolism for the larger cohort of “all articles,” which includes a wider range of studies reporting exclusive experience with either unassisted or balloon-assisted cases, does not lend itself to strict meta-analysis, however, is included in the chart for comparison with the analyzed results for the “mixed article” groups. SAH indicates subarachnoid hemorrhage; NA, no analysis.