The rupture of aneurysm and subarachnoidal hemorrhage (SAH) is complex intracranial condition. Often accompanied with dramatic clinical presentation, necessity for emergency diagnostic treatment and various complications. To make sure that proper diagnostic approach is provided for this patients University Department of Neurology, University Hospital “Sestre milosrdnice”, Croatian Society of Physicians, Croatian Society of Stroke Prevention, Croatian Society of Cerebrovascular Diseases of Croatian Society of Physicians issued references for treatment patients with stroke. Five-year study analysis of patients with clinical presentation of SAH at University Department of Neurology, University Hospital “Sestre milosrdnice” monitored the most common physical disorders with patients who had CT verified SAH, but no previously verified diagnosis of AV malformation or aneurysm. We analyzed EKG parameters, especially ST-T segment, alterations of QRS complex and ST segment. Preliminary results showed that EKG alterations spontaneously recovered in the first days after diagnosing SAH and were no predictors of outcome. Forward, we analyzed and some laboratory parameters, especially sodium level in blood. Hyponatriemia often appeared with SAH patients that can be explained by disruption of blood brain barrier and accumulation of sodium and interstitial fluid in intercellular space.