Despite a national workforce crisis in the wider AT profession in New Zealand, Dr Powell said, until recent times, the HBDHB had been able to avoid these problems by having a "committed team of anaesthetic technicians who are employed on superior terms and conditions".
"It's fair to say that staff retention problems are likely to arise under the DHB's proposed deal and, if we let that happen, then the residents of Hawke's Bay will suffer the consequences with a weakened surgical service and further delays to their elective surgeries," she said.
"Our members are striking to prevent this."
Twenty of 21 anaesthetic technicians at Hawke's Bay DHB are members of the union.
A HDHB spokeswoman said, as of 4pm yesterday , four life preserving surgeries went ahead.
Ten local anaesthetic surgeries went ahead yesterday, as planned, she said, as those surgeries don't require an anaesthetic technician to be present.
It is understood across the strike period, 48 elective surgeries, that require a general anaesthetic, are being put on standby and postponed if necessary - 10 more than was previously anticipated.
"Anaesthetic technicians are an integral part of operating theatre teams and any operation requiring a general anaesthetic must have a technician present," a spokesperson earlier said.