victorino chua , 49 , has given evidence for the first time and denied he murdered three and poisoned 18 more at stepping hill hospital in stockport .
victorino chua , 49 , has given evidence for the first time and denied he tampered with saline bags and ampoules at stepping hill hospital in stockport in order to kill and injure people he was caring for .
chua denies murdering patients tracey arden , 44 , arnold lancaster , 71 and derek weaver , and deliberately poisoning 18 others between 2011 and 2012 .