When was the first successful artificial pacemaker implanted in a human?

In 1958, Swedish surgeon Åke Senning implanted one of the first fully internal artificial pacemakers in patient Arne Larsson. The early device was developed with engineer Rune Elmqvist. Although the first implant had technical limitations, it opened the way for modern pacemakers. Larsson went on to live for many years and received multiple replacement devices over his lifetime.