A court in Germany has sentenced a nurse to life in prison for killing patients with overdoses of heart medication.

Oldenburg regional court found the 38-year-old guilty of charges including two counts of murder, and two counts of attempted murder, news agency dpa reported.

Prosecutors had accused the man, identified only as Niels H in line with German privacy rules, of three murders and two attempted murders during his time working at a clinic in the town of Delmenhorst.

But H said during the trial that he intentionally brought about cardiac crises in some 90 patients because he enjoyed the feeling of being able to resuscitate them. He said 30 patients died.

He was previously sentenced to seven-and-a-half years in prison for attempted murder in 2008.

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