Cynon Valley MP Ann Clwyd has called for an inquiry into the levels of care at the University Hospital of Wales - and for Cardiff and Vale University Health Health Board's chair, chief executive and board members to resign.
She complained about the poor treatment her husband received at the hospital, before he died in October 2012.
She is conducting a review into complaints by hospital patients in England, and told our reporter Sarah Hibbard that the situation at the University Hospital of Wales could be compared to Stafford Hospital, where it is thought hundreds may have died due to poor care between 2005 and 2008.
More top news
Hundreds of people dressed as santas and elves have been in Cardiff this afternoon, taking part in 5K run to help raise money for charity.
Former Plaid Cymru leader says Parliament and devolved nations must have a say on Brexit or there should be a new referendum
Swansea City failed to capitalise on last weekend's dramatic win over Crystal Palace, as they fell to a heavy 5-0 defeat away at Tottenham.