The goal of this observational study is to learn about the possibility to predict clinical course of subarachnoid hemorrhage (SAH) patients by performing the retrospective analysis of clinical data available in early pre-vasospasm phase. The main questions it aims to answer are: * What biomarkers retrieved from Computed Tomography (CT) and Computed Tomography Angiography (SAH location, leaked blood volume, cerebrospinal fluid volume, etc.) can be used to predict development of cerebral vasospasms, delayed cerebral ischemia and patients' outcome. * What biomarkers retrieved from transcranial Doppler examinations in early pre vasospasm can be used to predict development of cerebral vasospasms, delayed cerebral ischemia and patients' outcome. * What biomarkers retrieved from multimodal physiological monitoring in early pre vasospasm can be used to predict development of cerebral vasospasms, delayed cerebral ischemia and patients' outcome. * What is impact of other clinical data (blood test results, age, gender, etc.) on development of cerebral vasospasms and delayed cerebral ischemia.
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Cerebral vasospasms
Timeframe: CTA is performed routinely on 7th day after SAH or within period of 3-21 day after SAH if necessary
Delayed cerebral ischemia
Timeframe: CT is performed routinely on 7th day after SAH or within period of 3-21 day after SAH if necessary
Patient outcome
Timeframe: GOS is evaluated at discharge from hospital and after 30 days after SAH