Al-Khatib found that many patients who were being implanted with the ICDs had recently experienced arrhythmias or cardiac arrests.

CNN: STORY HIGHLIGHTS

And it said a third of the cardiac arrests could have been prevented.

BBC: NHS 'too quick to resuscitate acutely ill people'

Former Bolton Wanderers midfielder Fabrice Muamba is supporting a year-long campaign that aims to prevent death from sudden cardiac arrests.

BBC: Fabrice Muamba supports Hearts and Goals cardiac campaign