Hawke's Bay Hospital staff are reeling after a patient tried to throttle a nurse and another patient last week.
The attacker was saved from diving out an upper-floor window by hospital staff grabbing his feet.
A hospital spokesperson said an investigation had begun into the incident and staff members were offered time off and were being supported by an occupational health and safety team.
"As part of the response to this event, a debriefing with staff has been held and an investigation has begun as part of a normal response to an event," the spokesperson said.
Staff would be involved in the investigation "and briefed over the outcomes and any actions that may be needed to be put in place to prevent an event like this happening again".