Early Carotid Artery Stenting for Cerebral Watershed Infarction Is Safe and Effective: A Retrospective Study.

BACKGROUND: With carotid artery stenosis, infarcts can occur in the cortical or internal watershed areas, or both. The timing of carotid artery stenting (CAS) after a cerebral watershed infarction (CWI) is not yet codified. In this retrospective study, we analyzed the safety and clinical effect of early CAS for CWI patients due to carotid artery stenosis. METHODS: Between March 2011 and April 2014, 120 CWI patients with ipsilateral carotid artery stenosis were recruited. Of these 120 patients, 63 received CAS within 7 days of the symptom onset (group 1) and 57 received standard medical treatment at the symptom onset (group 2). Periprocedural complications were analyzed in group 1 to evaluate the safety of early CAS. Clinical effects were analyzed by evaluating National Institutes of Health Stroke Scale (NIHSS) score as well as modified Ranking Scale (mRS) score of pre- and post-treatment in 2 groups. RESULTS: There was no significant difference in pre-treatment NIHSS score between the 2 groups (8.52 ± 2.46 and 7.84 ± 2.64, p = 0.15). However, group 1 had lower post-treatment NIHSS score as compared to group 2 (3.03 ± 1.44 and 3.84 ± 1.73, p = 0.006). In both groups, NIHSS score after treatment was significantly reduced (p < 0.05). Treatment effect in group 1 was larger compared to group 2 (-5.49 ± 2.12 and -4.00 ± 1.98, p < 0.05). Before the treatment, both groups had similar patient numbers with mRS score ≤2; however, after 30 days of surgery, group 1 had more number of patients with mRS score ≤2 than group 2. CONCLUSION: This study suggested that early CAS for CWI can be performed without significant risk. More importantly, early CAS for CWI can improve the prognosis.