Incidence and risk factors for symptomatic cerebral hyperperfusion after superficial temporal artery-middle cerebral artery anastomosis in patients with moyamoya disease.
BACKGROUND
Superficial temporal artery-middle cerebral artery anastomosis for moyamoya disease prevents cerebral ischemic attack by improving CBF, whereas recent evidence suggests that the temporary neurologic deterioration because of postoperative cerebral hyperperfusion could occur despite its low-flow revascularization. The present study investigates the incidence and the risk factors for symptomatic hyperperfusion after STA-MCA anastomosis in patients with moyamoya disease.


METHODS
We prospectively performed N-isopropyl-p-[(123)I]iodoamphetamine single-photon emission computed tomography 1 and 7 days after STA-MCA anastomosis on 80 hemispheres of 58 consecutive patients with moyamoya disease (approximately 2-62 years old, 34.4 years old in average). Mean follow-up period was 22.7 months. Symptomatic cerebral hyperperfusion was defined as the presence of the significant increase in CBF at the site of the anastomosis that is responsible for the apparent neurologic sign.


RESULTS
Twenty-one patients (22 sides, 27.5%) temporarily had symptomatic cerebral hyperperfusion, who were subjected to intensive blood pressure control. Postoperative magnetic resonance imaging/angiography showed the thick high signal of bypass without ischemic changes in all 21 patients. Adult-onset (P = .013) or hemorrhagic-onset patients (P = .027) had significantly higher risk for symptomatic hyperperfusion. There was no difference in intraoperative temporary occlusion time between each group. No patients had permanent neurologic deficit because of hyperperfusion.


CONCLUSIONS
The STA-MCA anastomosis is a safe and effective treatment of moyamoya disease, although adult-onset and/or hemorrhagic-onset patients had higher risk for symptomatic hyperperfusion. We recommend routine CBF measurement especially for these patients because the management of hyperperfusion is contradictory to that of ischemia.
Department of Neurosurgery, Tohoku University Graduate School of Medicine, Sendai, Japan. fujimur@nsg.med.tohoku.ac.jp
Miki
M
Fujimura
Shunji
S
Mugikura
Tomohiro
T
Kaneta
Hiroaki
H
Shimizu
Teiji
T
Tominaga
D000293:Adolescent; D000328:Adult; D001921:Brain / Q000098:blood supply / Q000000981:diagnostic imaging / Q000503:physiopathology; D002545:Brain Ischemia / Q000453:epidemiology* / Q000473:pathology / Q000503:physiopathology; D002548:Cerebral Revascularization / Q000009:adverse effects* / Q000379:methods; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D015994:Incidence; D018810:Magnetic Resonance Angiography; D008297:Male; D008875:Middle Aged; D020768:Middle Cerebral Artery / Q000033:anatomy & histology / Q000502:physiology / Q000601:surgery*; D009072:Moyamoya Disease / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*; D049268:Positron-Emission Tomography; D011183:Postoperative Complications / Q000453:epidemiology* / Q000473:pathology / Q000503:physiopathology; D011446:Prospective Studies; D011859:Radiography; D012307:Risk Factors; D013699:Temporal Arteries / Q000033:anatomy & histology / Q000502:physiology / Q000601:surgery*; D016896:Treatment Outcome; D055815:Young Adult