Patients who have recently undergone aneurysmal coiling commonly present to the ED with complaints of new or worsened focal neurologic deficits that may be suggestive of stroke.
Aneurysms can be stabilized by clipping or coiling them. Coiling is performed in a minimally invasive manner, wherein platinum (a material that can be visualized radiographically and is flexible) coils are deployed into the bulb of the aneurysm, via femoral artery cannulation.
The relative risk of mortality or morbidity at one year post-coiling was found to be 22.6% less than that associated with clipping. The latter is an older, more invasive technique requiring craniotomy and direct manipulation of the brain.
Hemorrhage is a less likely complication related to aneurysm coiling, thus your indication for a non-contrast Head CT in these patients would most appropriately be "rule out infarct" rather than "rule out bleed."
Brain infarct is the more common complication of this treatment, and results from the accidental embolization of plaque during the coiling procedure.
Here are a couple of great links with illustrated overviews of the process of coiling, including a real time You Tube clip:
