Preoperative neurological presentation and postoperative neurological outcomes
The documented preoperative neurological presentation was in 73.3% of patients. The most presentation was stroke or cerebrovascular accident (n = 188) and coma or altered consciousness (n = 124). Syncope presented in 54 patients,and TIA presented in 16. The rare presentation seizure was in 3 patients. The preoperative GCS was reported in 3 studies, but the definition is varied. The preoperative NIHSS score was 18.2 ± 13.3 in 3 papers. One paper provided a Japan Coma Scale [2 (n = 6), 20 (n = 2), 200 (n = 1)].
In nine studies, the postoperative neurological outcome was documented according to the recovery of neurologic status including 199 patients, completely recovered or improved in 108 (54.3%) patients, remained the same or on change in 54 (27.1%) patients, and worsened in 17 (8.5%) patients. Two reports only recorded the new postoperative neruological deficits in 30 patients( 46.2%). The new-onset postoperative neurological dysfunction was in 50 patients. In one paper, the post-CVA was 11 (11.1%), and the post-coma was 9 (9.1%).