Maquet Cardiovascular have issued a Safety Notice concerning the temperature reading on a certain number of PLEGIOX Cardioplegia heat exchangers. The problem is limited to selected lot numbers and only affects a small number of hospitals in the UK. The cause of the problem is a change to a moulded component, which restricts the depth the external temperature probe can be inserted into the device. There could be up to a three degree Celsius difference in read and actual temperature however the performance of the heat exchanger is unaffected.