The nurses union fears more violent incidents will take place unless something changes.
A Wairarapa Hospital visitor suffered a skull fracture after being attacked with a machete in the emergency department on Saturday night.
In December, the Government temporarily boosted security staff at a number of hospitals til the end of February.
Nurses Organisation President Kerri Nuku told Mike Hosking that de-escalation training needs to go across the board.
She wants nurses involved in conversations around what to do.
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