The 500,000th pacemaker operation in the UK has taken place - at the same hospital, St George's, London, which carried out the first such procedure in 1958.
It was received by Karl Sidhu from Camberley, Surrey, to resynchronise his heart muscle function, which was not working as well as it should after a series of heart attacks.
Mr Mark Gallagher, a Consultant Cardiologist, talks through how it was fitted.
One-Minute World News 
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