Background
Although
patients with improved cognition after carotid endarterectomy usually
exhibit postoperative restoration of cerebral blood flow, less than half
of patients with such cerebral blood flow change have postoperatively
improved cognition. Cerebral small vessel disease on magnetic resonance
imaging is associated with irreversible cognitive impairment.
Aims
The
purpose of the present prospective study was to determine whether
pre-existing cerebral small vessel disease affects cognitive improvement
after carotid endarterectomy.
Methods
Brain
MR imaging was performed preoperatively, and the number or grade of
each cerebral small vessel disease was determined in 80 patients
undergoing carotid endarterectomy for ipsilateral internal carotid
artery stenosis (≥70%). The volume of white matter hyperintensities
relative to the intracranial volume was also calculated. Brain perfusion
single-photon emission computed tomography and neuropsychological
testing were performed preoperatively and two months postoperatively.
Based on these data, a postoperative increase in cerebral blood flow and
postoperative improved cognition, respectively, were determined.
Results
Logistic
regression analysis using the sequential backward elimination approach
revealed that a postoperative increase in cerebral blood flow (95%
confidence interval [CI], 10.74–3730.00; P = 0.0004) and the relative volume of white matter hyperintensities (95% CI, 0.01–0.63; P = 0.0314)
were significantly associated with postoperative improved cognition.
Although eight of nine patients with postoperative improved cognition
exhibited both a relative volume of white matter hyperintensities
<0.65% and a postoperative increase in cerebral blood flow, none of
patients with a relative volume of white matter hyperintensities ≥0.65%
had postoperative improved cognition regardless of any postoperative
change in cerebral blood flow.
Conclusion
Pre-existing
cerebral white matter hyperintensities on magnetic resonance imaging
adversely affect cognitive improvement after carotid endarterectomy.
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