Cardiff and Vale University Health Board says it has developed "a detailed action plan to make sure that we are addressing all areas" of concern, and the Royal College of Surgeons will visit again in September to see if there has been improvement.
The health board is looking at all options to increase cardiac surgery capacity, and looking at proposals to get patients treated more quickly.
Chief Executive Alun Cairns said the health board is working with surgeons "on a range of actions", and looking at what extra capacity could be provided, and improving how it manages emergency, care.
We know that we can do better and we have given priority to the issues raised in the RCS report.One of the main areas of concern has been the pressure on unscheduled care, seen here in Cardiff and the Vale, Wales and across the UK, and the impact that has on other services.
A great deal of engaging with clinical teams and partners such as the third sector and Local Authorities has been done over these issues and a number of pieces of work, directed and driven by clinical staff, are now starting to take effect.
– Adam Cairns, Chief Executive of Cardiff and Vale University Health Board
Wales' biggest hospital has been described as "dangerous", in a highly critical report from the Royal College of Surgeons.
It found that "patients are regularly dying on the waiting list from their cardiac pathology" and there was "universal consensus" among clinicians at the University Hospital of Wales in Cardiff that services there were "dangerous."
It warns "the current situation represents a severe risk to patients and urgent action is required."
"A wide range of concerns were raised" by clinical leads at the hospital during a routine visit by the RCS in April - the most prevalent was "the inability to admit patients for elective surgery." There were more than 2,000 operations either cancelled or not scheduled between January and March 2013.
"The main reason for this is the apparent unconstrained admission of emergency patients and the inability to effectively discharge patients", the report said.
Cardiff and Vale University Health Board is to carry out consultations with management and unions over staff reorganisation which could lead to redundancies.
The service change plans potentially affect around 385 employees says the health board.
“Many of these plans involve redesigning a number of services to deliver the same, or better, care in a different way, and in a more cost effective way. This includes reshaping the UHB’s workforce, in line with what has been proposed," says the board's Chief Executive, Adam Cairns.
The health board employs 14,500 staff and says redundancies will be a "last resort" and staff who need to change roles will be offered training to assume new responsibilities.
All of those who were at the University Hospital of Wales after being injured in a series of collisions in Cardiff just over a week ago have now been discharged.
The alleged hit-and-run collisions took place in several locations to the west of Cardiff, including Grand Avenue, Cowbridge Road West and the Leckwith Retail Park on October 19.
31-year-old Karina Menzies died as a result of the incident.
13 other people were injured including at least seven children.
A 31-year-old man remains in police custody charged with murder, 13 counts of attempted murder, four counts of actual bodily harm and one of dangerous driving. He will reappear in court on 28th January.
A suspension order against the midwife heavily criticised for her role at the birth of baby Noah Tyler, who died after suffering brain damage when he was born, will continue. Julie Richards' suspension will be reviewed in three months, a malpractice hearing ruled this morning.
Yesterday, Cardiff coroner Mary Hassell said Ms Richards blamed "gross failure" to provide adequate care for Noah's difficult birth, and subsequent death when he was just 10 months old. Earlier in the inquest proceedings, Ms Richards admitted making "catastrophic mistakes" at the birth.
I would like to offer our sincerest sympathies and apologies to Noah’s family, who we continue to support in any way we can. We are deeply sorry for what happened to Noah and Mrs Tyler, and this case has made us even more determined to constantly review and improve our services to ensure we provide the excellent care for mums and their babies that they have a right to expect.
We would like to reassure the public that we have thoroughly investigated what happened in this tragic case and have taken a number of clear and decisive actions, including dismissing the midwife involved.
– Paul Hollard, Interim Chief Executive of Cardiff and Vale University Health Board