Detection of symptomatic vasospasm after subarachnoid haemorrhage: initial findings from single time-point and serial measurements with arterial spin labelling.
OBJECTIVE
To detect symptomatic hemispheres during the postoperative course of subarachnoid haemorrhage (SAH) using arterial spin labelling (ASL).


METHODS
Eighteen patients with aneurysmal SAH were included; four exhibited symptomatic vasospasm postoperatively. All patients underwent ASL on days 9-10 (single time-point ASL). Nine patients underwent serial measurements of ASL (serial ASL) on days 1-2, 9-10 and 13-21, and seven patients also underwent imaging on days 4-7. CBF in the posterior part of the MCA territory was measured, and the ipsilateral/contralateral ratio of CBF was calculated. Differences between symptomatic hemispheres and others underwent ROC analysis.


RESULTS
Single time-point ASL revealed that CBF(day9-10) and CBF(i/c_day9-10) were significantly lower in symptomatic hemispheres than in asymptomatic hemispheres (P < 0.001). Serial ASL was significantly decreased on CBF(day4-7) compared with CBF(day1-2) and on CBF(day9-10) compared with CBF(day4-7), and significantly increased on CBF(day13-21) compared with CBF(day9-10). ROC analysis of single time-point ASL revealed that AUC for CBF(day9-10) was 0.95, significantly higher than CBF(i/c_day9-10) (P < 0.001). ROC analysis of serial ASL showed that AUC for CBF(day9-10) was 0.93 and significantly higher than CBF(day9-10/day1-2) and CBF(i/c_day9-10) (P < 0.001).


CONCLUSIONS
Single time-point ASL revealed significant CBF reduction in symptomatic hemispheres compared with asymptomatic hemispheres. Serial ASL showed time-dependent CBF changes after SAH.


CONCLUSIONS
• MR arterial spin labelling (ASL) can non-invasively assess cerebral blood flow (CBF)                                  • ASL revealed significant CBF reduction in symptomatic hemispheres compared with asymptomatic hemispheres                                  • Serial ASL measurements enable observation of time-dependent CBF changes after SAH                                                     • ASL is non- invasive and suitable for serial repeated examinations.
Department of Neurosurgery, Ichinomiyanishi Hospital, Kaimei, Ichinomiya, 494-0001, Japan.
Kunihiro
K
Aoyama
Yasutaka
Y
Fushimi
Tomohisa
T
Okada
Akihiro
A
Miyasaki
Hideaki
H
Taki
Kazunori
K
Shibamoto
Kaori
K
Togashi
D000328:Adult; D000368:Aged; D001158:Arteries / Q000503:physiopathology; D002560:Cerebrovascular Circulation; D003952:Diagnostic Imaging / Q000379:methods; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012372:ROC Curve; D013113:Spin Labels; D013345:Subarachnoid Hemorrhage / Q000150:complications / Q000503:physiopathology*; D013997:Time Factors; D020301:Vasospasm, Intracranial / Q000175:diagnosis* / Q000503:physiopathology
D013113:Spin Labels