Univariate analysis indicated that lower activities of daily living score on admission, emergency admission, mechanical ventilation, taking antiplatelet aggregation drugs, admission GCS score of less than 8 points, high Hunt–Hess grade on admission, albumin reduction, hyperglycaemia, hyponatremia, surgical procedure, unexpected reoperation, operation time > 4 h, non-class I incision, intraoperative blood loss, hypothermia therapy, and central venous catheterization were factors associated with HAI in patients with intracranial aneurysm surgery (P < 0.05) (Table 2). The gene discussed is ALB; the disease is Dilatation of the cerebral artery.