Time Course of Cerebrovascular Reactivity in Patients Treated for Unruptured Intracranial Aneurysms: A One-Year Transcranial Doppler and Acetazolamide Follow-Up Study

Table 2

Aneurysm and treatment characteristics.

Multiple aneurysms, (%)	12 (35.3)
Treatment modality, (%)
Coil	22 (64.7)
Clip	12 (35.3)
Treatment side, (%)
Left	18 (52.9)
Right	16 (47.1)
Location of treated aneurysms, (%)
MCA	14 (41.2)
ICA, incl. ophthalmic artery and PCOM	10 (29.4)
ACOM, anterior complex, and pericallosal artery	7 (20.6)
Basilar top, cerebelli superior, PICA, VB, and distal posterior	3 (8.8)
Size of treated aneurysms, mean (SD)
Maximum diameter (max), mm	6.3 (2.4)
Height (), mm	6.4 (2.8)
Neck (), mm	4.1 (1.8)
Width (), mm	5.4 (2.2)
Aspect ratio	1.6 (0.5)
Bottleneck ratio	1.4 (0.5)

In four of twelve patients temporal clipping of a parent artery was performed; one patient treated with combined clipping of an ACOM aneurysm and a right MCA aneurysm in one procedure was allocated to the right side. Eight patients with midline aneurysms (ACOM and basilar top) were allocated to the chosen side of approach; the majority of patients received treatment for a single aneurysm. For the 4 of 34 patients (11.8%) that underwent treatment for two aneurysms during the same procedure, aneurysm size was averaged; ACOM: anterior communicating artery; ICA: internal carotid artery; MCA: middle cerebral artery; PCOM: posterior communicating artery; PICA: posterior inferior cerebellar artery; VB: vertebrobasilar artery; maximum diameter (max): maximum diameter of the dome (independent of angles and directions); height : maximum height from dome tip perpendicular to aneurysm neck; neck : diameter of the aneurysm neck; width : maximum diameter of the dome, perpendicular to the aneurysm height .