International research suggests half could have been avoided or minimised.

Five homicides within 15 months involving acutely unwell mental health patients have led to an overhaul of health systems following a critical review.

Health authorities were warned about a troubled teenager's threat to overdose on her anxiety medicine but no urgent measures were taken prior to her death, an inquest has been told.

The Hutt Valley District Health Board is getting a cash injection of $8.6 million.

Hospital falls caused more than a quarter of the major "adverse events" listed by DHBs in their latest report on potentially preventable healthcare harm.