• Sameer H Halani, Jason K Chu, James G Malcolm, Rima S Rindler, Jason W Allen, Jonathan A Grossberg, Gustavo Pradilla, and Faiz U Ahmad.
• Department of Neurosurgery, Emory University School of Medicine, Atlanta, Georgia.
• Neurosurgery. 2017 Aug 1; 81 (2): 204-216.

BackgroundCranioplasty after decompressive craniectomy (DC) is routinely performed for reconstructive purposes and has been recently linked to improved cerebral blood flow (CBF) and neurological function.ObjectiveTo systematically review all available literature to evaluate the effect of cranioplasty on CBF and neurocognitive recovery.MethodsA PubMed, Google Scholar, and MEDLINE search adhering to Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines included studies reporting patients who underwent DC and subsequent cranioplasty in whom cerebral hemodynamics were measured before and after cranioplasty.ResultsThe search yielded 21 articles with a total of 205 patients (range 3-76 years) who underwent DC and subsequent cranioplasty. Two studies enrolled 29 control subjects for a total of 234 subjects. Studies used different imaging modalities, including CT perfusion (n = 10), Xenon-CT (n = 3), single-photon emission CT (n = 2), transcranial Doppler (n = 6), MR perfusion (n = 1), and positron emission tomography (n = 2). Precranioplasty CBF evaluation ranged from 2 days to 6 months; postcranioplasty CBF evaluation ranged from 7 days to 6 months. All studies demonstrated an increase in CBF ipsilateral to the side of the cranioplasty. Nine of 21 studies also reported an increase in CBF on the contralateral side. Neurological function improved in an overwhelming majority of patients after cranioplasty.ConclusionThis systematic review suggests that cranioplasty improves CBF following DC with a concurrent improvement in neurological function. The causative impact of CBF on neurological function, however, requires further study.Copyright © 2017 by the Congress of Neurological Surgeons

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