RESUMO
Objective: To investigate the relationship between the extent of leptomeningeal anastomosis (LMA) and cerebral infarct volume and distribution detected by digital subtraction angiography (DSA) in patients with M1-segment middle cerebral artery (MCA) occlusion. Methods: Fifty patients with acute cerebral infarction caused by the occlusion of the M1-segment MCA were included in the study. LMA was scored according to the DSA findings. The patients were divided into 2 groups according to the results of their scores: a better collateral circulation group (1-2 points) (n =24) and a worse collateral circulation group (3-5 points) (n =26). Cerebral infarct volume was calculated by coniglobus formula. The differences of cerebral infarct volume of the patients in both groups were compared. The relationship between the infarct volume and LMA score was determined. At the same time, the differences of cerebral infarction in the distribution of MCA blood supply in all subareas in patients of both groups were compared. Results: Circled digit oneThe mean infarct volume was 21. 8±10. 9 cm3 in the better collateral circulation group and 100. 7±37. 4 cm3 in the worse collateral circulation group. There was significant difference between the two groups (t = 36. 78, P 0. 05). However, in the comparison of the proportion of patients with more than 3 risk factors, the better collateral circulation group (33. 3%, 8/24) was lower than the worse collateral circulation group (65. 4%, 17/26). The difference was statistically significant (P = 0. 024). Conclusion: When M1-segment MCA was occluded, the LMA score is inversely associated with the cerebral infarct volume. The LMA mainly compensates the anterior branch and middle branch of the MCA territory, while the compensation in the basal nuclear region is poor.