Concerns have been raised about the safety of microwave heat packs after an elderly died whilst using one. Doreen Ghiloni had used a heat pack called a Hottie rather than a traditional hot water bottle. Heat packs are heated in the microwave and are made to slowly release heat over a period of time. In this case the item caught fire in her bed and it is thought she was overcome by the fumes. Firs investigators in West Yorkshire have dealt with six other incidents involving heat packs in the past year and Mrs Ghiloni's family are now campaigning for the instructions of the packs to be changed to try and prevent any further accidents.