Ultrasound guided percutaneous ethanol injection (PEI) is an established method in the treatment of hepatocellular carcinoma (HCC) and considered a safe procedure with severe complications occurring rarely. Previous studies revealed, that the occurrence of bradycardia and sinuatrial blockage is quite frequent during ethanol instillation sometimes accompanied by clinical complications such as unconsciousness, respiratory arrest or seizure like symptoms. Study purpose is to evaluate whether the use of i.v. Atropine before starting ethanol instillation can prevent dysrhythmias during instillation. Study design: randomized, placebo controlled, double blinded study. Atropine or saline solution will be administered intravenously to 40 patients immediately before starting percutaneous ethanol instillation. A 6 line ECG with limb leads will be recorded at rest and during ethanol instillation to reveal possibly occurring dysrhythmias.