In the latest in ITV News' series of reports, From The Heart focuses on the extraordinary medical technology that keeps patients alive - while they wait for the heart transplant they so desperately need.
As ITV News' medical editor Lawrence McGinty reports from Papworth Hospital, the shortage of donors means that it is sometimes a long wait:
Royal College of Nursing (RCN) director Janet Davies told the BBC the findings were "very concerning but not surprising - we have been hearing about this for some time from nurses".
She added: "What we are finding is the pressures, particularly in hospitals and community areas, are getting greater as we have got more patients who are sicker coming through the system.
"We are seeing nursing posts frozen or cut in order to try and balance the books, it's obviously something we have been looking at for some time."
More than half of nurses think their ward or unit is dangerously understaffed, a Nursing Times survey revealed today.Read the full story ›
A Department of Health statement has responded to today's Nursing Time survey and its findings that suggest more than half of nurses think their ward or unit is dangerously understaffed.
There are more clinical staff working in the NHS now than there were in May 2010, and nearly 2,500 new nurses started working in NHS in October 2012 alone.
Hospitals are in charge of setting staffing levels but nursing leaders have been clear that they should publish staffing details and the evidence to show the numbers are right and safe for the services they deliver.
We are working with the sector skills councils, unions and employers to develop minimum training standards and a new code of conduct for health support workers.
The majority of respondents to the Nursing Times survey also said the ratio of patients to each nurse at their hospitals could compromise patient care.
More than eight out of 10 respondents said staffing on general medical wards in an acute hospital was at a ratio of eight patients to one nurse, or more.
And of these nearly half (44%) said the ratio was 10 or more patients per nurse.
A ratio of eight or more patients per registered nurse is associated with patient care on a ward regularly being compromised by short staffing, according to the Royal College of Nursing (RCN).
More than half of nurses think their ward or unit is dangerously understaffed, a Nursing Times survey revealed today.
Nearly six out of 10 (57%) described their ward as sometimes or always "dangerously understaffed", the research showed.
Over three quarters (76%) said they had witnessed "poor" care in their ward or unit over the past year - of which nearly 30% said they see poor care regularly.
Ahead of the the publication of the public inquiry report into deaths at Mid Staffordshire Hospital, the magazine polled 600 of its readers across a range of issues including staffing, patient safety and NHS culture.
Hospitals across England are to take part in a new scheme aimed at helping to rescue vulnerable children from abuse and neglect.
A national database is being set up to record each time a child visits Accident and Emergency, or has an out-of-hours consultation with a GP.
ITV News correspondent Sue Saville reports on the new plans:
Lisa Harker, head of strategy at the NSPCC has welcomed the announcements of plans to log children's visits to A&E on a national database, but has said that it is "down to the quality and the skills" of the professionals involved.
Lisa Harker, head of strategy at the NSPCC, welcomed the announcement of plans to log children's visits to A&E on a national database.
She said: "NHS doctors and nurses are often in the frontline of child protection and play a crucial role in identifying abuse victims as quickly as possible.
"So this new system for sharing information about children at risk should prove an important aid."
Under the Government's new plans, a flag will appear on a child's medical record if they are subject to a child protection plan or are being looked after by the local authority
According to the Department of Health, doctors and nurses will be able to use this information as part of their overall clinical assessment, along with information about where and when children have previously been receiving urgent treatment.
This will help them build up a better picture of what is happening in the child's life so they can alert social services if they think something might be wrong.