title: Electrocardiographic changes during percutaneous liver needle biopsy.
mesh_terms: D000368:Aged; D001145:Arrhythmias, Cardiac / Q000209:etiology* / Q000523:psychology; D001707:Biopsy, Needle / Q000009:adverse effects*; D004562:Electrocardiography; D006801:Humans; D008099:Liver / Q000473:pathology*; D008875:Middle Aged; D013315:Stress, Psychological / Q000523:psychology