• Zhiyuan Yu, Jun Zheng, Rui Guo, Lu Ma, Mou Li, Xiaoze Wang, Sen Lin, Hao Li, and Chao You.
• Department of Neurosurgery, West China Hospital, Sichuan University, Chengdu, Sichuan, China.
• Clin Neurol Neurosurg. 2017 Dec 1; 163: 84-89.

ObjectivesHematoma expansion is independently associated with poor outcome in intracerebral hemorrhage (ICH). Blend sign is a simple predictor for hematoma expansion on non-contrast computed tomography. However, its accuracy for predicting hematoma expansion is inconsistent in previous studies. This meta-analysis is aimed to systematically assess the performance of blend sign in predicting hematoma expansion in ICH.Material And MethodsA systematic literature search was conducted. Original studies about predictive accuracy of blend sign for hematoma expansion in ICH were included. Pooled sensitivity, specificity, positive and negative likelihood ratios were calculated. Summary receiver operating characteristics curve was constructed. Publication bias was assessed by Deeks' funnel plot asymmetry test.ResultsA total of 5 studies with 2248 patients were included in this meta-analysis. The pooled sensitivity, specificity, positive and negative likelihood ratios of blend sign for predicting hematoma expansion were 0.28, 0.92, 3.4 and 0.78, respectively. The area under the curve (AUC) was 0.85. No significant publication bias was found.ConclusionThis meta-analysis demonstrates that blend sign is a useful predictor with high specificity for hematoma expansion in ICH. Further studies with larger sample size are still necessary to verify the accuracy of blend sign for predicting hematoma expansion.Copyright © 2017 Elsevier B.V. All rights reserved.

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