John Hopps was a Canadian electrical engineer working for the National Research Council in the early 1950s.While studying hypothermia treatments for heart surgery, he observed that a cooled heart would stop beating but could be restarted using mechanical or electrical stimulation.Building on earlier concepts of cardiac pacing (first demonstrated in the 1930s), Hopps developed the first external, portable pacemaker in 1950–1951.His device was large and plugged into a wall outlet, but it laid the
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