Logistic regression model analysis showed that the independent risk factors for poor prognosis in patients with aSAH complicated with hydrocephalus at 6 months after surgery were “increased age” (OR = 1.038, 95%Cl: 1.003–1.074) and “increased CRP” (OR = 1.057, 95%Cl: 1.031–1.084), “increased neutrophils” (OR = 1.212, 95%Cl: 1.076–1.365) and “high Hunt-Hess grade” (OR = 2.538, 95%Cl: 1.532–4.208) (P < 0.05) (Table 4). Here, CRP is linked to Hydrocephalus.