Cystatin c: a Biomarker of AKI in Aneurysmal Subarachnoid Haemorrhage Patients

Inclusion Criteria: * Patient admission to hospital within 48 hours of subarachnoid haemorrhage onset. * Subarachnoid haemorrhage caused by intracranial aneurysm rupture and is confirmed via computed tomography angiography (CTA). * Medical treatment, microsurgical clipping, or interventional endovascular treatment of aneurysm is performed within 48 hours of subarachnoid haemorrhage onset. Exclusion Criteria: * Prior onset of subarachnoid haemorrhage or other neurological diseases such as ischemic stroke, hemorrhagic stroke, or severe head trauma. * Systemic diseases, such as chronic liver diseases, chronic lung diseases, chronic heart failure, thyroid diseases and cancer. * Renal impairment at time of admission (creatinine-based eGFR less than 60 ml/min per 1.73 m2 body surface area). * Patients who are hemodynamically unstable at time of admission. * Mortality within 10 days after admission (duration of study).