The Irish Nurses and Midwives Organisation (INMO) has suspended its industrial action at Naas General Hospital.
It follows negotiations with management, which the union said "intensified this evening".
A spokesperson for the union said it had secured the immediate backfill of 60 vacant nursing posts.
"These offers will come from existing panels," a statement said.
The union said it had also secured an additional thirty new posts to cover additional services.
"A full review of all nurse staffing will begin at the hospital this week against the safe staffing framework" the statement added.
The INMO said the disputes committee at Naas General Hospital has recommended that members are balloted on proposals next week.
Nurses at Naas General Hospital, who are members of the INMO, began industrial action at the hospital on Monday.
The action, which was in the form of a work-to-rule, was in a dispute over staffing numbers.
Earlier, INMO general secretary Phil Ní Sheaghdha explained that the "very busy" hospital had seen a "massive increase" in emergency department attendances.
The area, which is seeing population growth generally, also contains nursing homes that are increasingly dealing with people from Dublin that rely on Naas General Hospital when they become unwell.
"All in all, the staffing has not kept pace with the population and the demand on services in the hospital," Ms Ní Sheaghdha said.
She also said the issue has been going on for years, leading to patients being cared for in inappropriate areas.
Nurses 'on hands and knees' over staffing issues
The INMO says highly-skilled theatre nurses are owed hundreds of hours of time back.
"Nurses do not feel the care they can deliver can be delivered safely - and that's a real risk."
Ms Ní Sheaghdha said the INMO wanted the HSE to deal with the issue "swiftly", adding: "We want the employer make real proposals that we can put to members that we can say there is a likelihood that this will resolve this dispute.
"At the moment, we're not at the point. We continue to talk and that's good but the proposals we've had to date are not sufficient."
Zoe Cleary, who works as a clinical facilitator in the emergency department, said the issues at the unit involve uncovered maternity leave and leaving staff not being replaced.
"Our staff are on their hands and knees. They're expected to do workloads of multiple additional people. There's huge burnout, there's huge stress, and there's a huge problem with retaining staff."
Ruth O'Connor, a staff nurse in theatre and endoscopy, said members had become "quite cynical" about the approach taken by the HSE after highlighting issues for a "long, long time".
"None of us want to be out here. We want to be in there looking out for our patients but the standard of care is being eroded through no fault of our own."
Ms O'Connor said local people were "anxious" coming into the emergency department because they know "the level of service is so compromised" by staffing issues.
"Not only are we being stretched very thin, we're being asked to extend our services with the staff we have - which is preposterous.
"This is not about pay - it is purely about safety and dignity. We're not able to provide patients the dignity that patients deserve," she said.
The HSE earlier said it regretted the industrial action and said it had taken efforts to resolve the issues raised.
In a statement on behalf of the hospital, it said: "The HSE remains willing and available to engage constructively with the INMO at any time in order to reach a sustainable resolution."
The HSE said there had been "significant growth" in the workforce of the hospital in recent years, adding that there are further plans to "progress longer-term measures to support and strengthen nursing capacity".
Additional reporting: PA
