Impact of cerebral blood flow changes due to arterial bypass surgery on cognitive function in adult patients with symptomatic ischemic moyamoya disease

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OBJECTIVE

Some adult patients with moyamoya disease (MMD) undergoing revascularization surgery show an improvement or decline in cognition postoperatively. Revascularization surgery for ischemic MMD augments cerebral blood flow (CBF) and improves cerebral oxygen metabolism. However, cerebral hyperperfusion, which is a short-term, major increase in ipsilateral CBF that is much greater than the metabolic needs of the brain, sometimes occurs as a complication. Cerebral hyperperfusion produces widespread, minimal injury to the ipsilateral white matter and cortical regions. The aim of the present prospective study was to determine how changes in CBF due to arterial bypass surgery affect cognitive function in adult patients with symptomatic ischemic MMD and misery perfusion.

METHODS

Thirty-two patients with cerebral misery perfusion, as determined on the basis of 15O gas positron emission tomography, underwent single superficial temporal artery–middle cerebral artery (M4 in the precentral region) anastomosis. Brain perfusion single-photon emission computed tomography (SPECT) studies were performed preoperatively, on the 1st postoperative day, and 2 months after surgery. Neuropsychological tests were also performed preoperatively and 2 months after surgery.

RESULTS

Postoperative neuropsychological assessments demonstrated cognitive improvement in 10 cases (31%), no change in 8 cases (25%), and decline in 14 cases (44%). Based on brain perfusion SPECT and symptoms, 10 patients were considered to have cerebral hyperperfusion syndrome, and all of these patients exhibited a postoperative decline in cognition. Relative precentral CBF on the 1st postoperative day was significantly greater in patients with postoperative cognitive decline (167.3% ± 15.3%) than in those with improved (105.3% ± 18.2%; p < 0.0001) or unchanged (131.4% ± 32.1%; p = 0.0029) cognition. The difference between relative precentral CBF 2 months after surgery and that before surgery was significantly greater in patients with postoperative cognitive improvement (17.2% ± 3.8%) than in those with no postoperative change (10.1% ± 2.4%; p = 0.0003) or with postoperative decline (11.5% ± 3.2%; p = 0.0009) in cognition.

CONCLUSIONS

Cerebral hyperperfusion in the acute stage after arterial bypass surgery impairs cognitive function. An increase in CBF in the chronic stage without acute-stage cerebral hyperperfusion improves cognitive function in adult patients with symptomatic ischemic MMD and misery perfusion.

ABBREVIATIONS CBF = cerebral blood flow; 123I-IMP = N-isopropyl-p-[123I]-iodoamphetamine; IQ = intelligence quotient; MCA = middle cerebral artery; MMD = moyamoya disease; OEF = oxygen extraction fraction; PET = positron emission tomography; POD 1 = postoperative day 1; RCBFafMCA = relative CBF in the affected MCA ROI; ROC = receiver operating characteristic; ROI = region of interest; SPECT = single-photon emission computed tomography; STA = superficial temporal artery; WAIS-R = Wechsler Adult Intelligence Scale–Revised.
Article Information

Contributor Notes

Correspondence Kuniaki Ogasawara: Iwate Medical University, Morioka, Japan. kuogasa@iwate-med.ac.jp.INCLUDE WHEN CITING Published online December 14, 2018; DOI: 10.3171/2018.7.JNS18149.Disclosures Dr. Ogasawara reports having a consigned research fund from Nihon Medi-Physics Co., Ltd.

© AANS, except where prohibited by US copyright law.

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