Hyperammonaemia and aggravation of underlying hepatic encephalopathy: case reportA 72-year-old man developed hyperammonaemia and aggravation of underlying hepatic encephalopathy during treatment with lorazepam for alcohol withdrawal syndrome.The man had liver cirrhosis, recurrent hepatic encephalopathy, oesophageal varicose veins, small fungal varicose veins, diastolic dysfunction type I and mild mitral insufficiency. He was receiving spironolactone [spirinolactone], lactulose and thiamine. He had a pattern of chronic alcohol consumption. He was hospitalised. Upon admission, he was diagnosed with Grade III hepatic encephalopathy. Alcohol withdrawal syndrome was suspected. He was found to have hyponatraemia that increased the degree of drowsiness. He was treated with lactulose and rifaximin [rhyphaximine]. Following diagnosis of alcohol withdrawal syndrome, he started receiving oral lorazepam 1mg every 12 hours. However, on day 4, he demonstrated inattention, marked fluctuations in consciousness state, multisensory hallucinations, reversal of the wakefulness-sleep pattern along with neurovegetative instability. He was diagnosed with acute confusion syndrome. After 6 days of lorazepam treatment, he demonstrated predominantly psychomotor inhibition and lethargy. Signs such as slapping were observed on the physical exam (flapping). Laboratory investigation revealed elevated serum ammonia level and aggravation of liver function tests. He also developed health careassociated pneumonia, which was treated with piperacillin/tazobactam. EEG showed a slow wave pattern, with predominant beta rhythm and few delta and theta waves. Based on clinical presentation and investigational findings, he was diagnosed with hyperammonaemia and aggravation of underlying hepatic encephalopathy secondary to lorazepam [not all time to reaction onsets clearly stated].Lorazepam dose was reduced to 0.5mg every 12 hours. The man was treated with thiamine. Six days later, marked drowsiness and little alertness was observed. Lorazepam was switched to haloperidol. The replacement led to an improvement in his confusional picture. His mental state progressively improved. However, he developed various unspecified complications due to pneumonia, as well as liver failure which caused his death [not all outcomes stated].