<prompt> A symmetric high-voltage, triphasic slow wave pattern is seen on EEG in the followingHepatic encephalopathyUremic encephalopathyHypoxic encephalopathyAll  <response>: Answer is A Hepatic encephalopathy: Symmetric, high voltage, triphasic slow wave 2-5second fattern on Electroencephalogram EEG is characteristic hut non specific of hepatic encephalopathy- Harrison 16th1868 The diagnosis of hepatic encephalopathy should be considered when four major factors are present Acute or chronic hepatocellular disease andor extensive poal systemic collateral shunts Disturbance of awareness and mentation which may progress from forgetfulness and confusion to stupor and finally coma. Shifting combinations of neurological signs including asterixis, rigidity, hyperreflexia, extensor plantar signs and rarely seizures. A characteristic but nonspecific, symmetric, high voltage, triphasic slow wave 2 or 5second pattern on electroencephalogram. 