The Southern DHB has postponed surgeries, procedures and outpatient appointments scheduled for tomorrow due to the strike, but emergency departments throughout the region will remain open for urgent life-preserving care.
Rural hospitals in Gore, Balclutha, Oamaru, Ranfurly and Dunstan, as well as general practices and most other health services, are not directly affected.
A Dunedin emergency department nurse, who did not wish to be named, said most days work conditions for nurses were concerning and they often felt worried for the safety of themselves and their patients.
"Patients come in and go out at quite a pace and I feel many times I wasn't able to safely care for my patients or hand over some of those patients to the appropriate nurse.
"There is a huge risk of mistakes being made in regard to medications and notes and all sorts of other things.
"It is very disturbing and distressing to feel like you are not able to give patients the timely care that they require and that you are not able to at times fulfil the requirements that the doctors are asking of you."
Workloads were unsustainable in the short or long term and were affecting the health and wellbeing of all staff and patients, the nurse said.
A ward nurse said they were striking because their profession was undervalued.
"We are substantially underpaid for the amount of responsibility we have on a day-to-day basis and for the level of education we must undertake.
"We are chronically understaffed and picking up overtime is a must to ensure that our patients are cared for."
NZNO lead advocate David Wait said the only concession by DHBs in negotiations had been a lump sum payment of $4000 to nurses, but that represented a part payment on back pay for their still unsettled pay equity claim.
"Members know that lump-sum payments do not lift actual rates of pay, which impacts on the long-term issues of a health system that values nurses and their work, attracts new people into the profession and encourages others back from overseas."