An Investigation is underway to discover if anyone died at a scandal-hit hospital trust because of a preventable backlog of letters.
Worcestershire Acute Hospitals NHS Trust saw 22,000 patients miss out on getting vital letters because of a computer blunder.
The documents stated what follow-up care was deemed necessary for anyone who was receiving treatment at the trust's hospitals.
Letters went undelivered for six years because some members of staff were unsure they had to click two buttons to send the messages.
Worcestershire Acute Hospitals NHS Trust, which runs the Worcestshire Royal Hospital, saw 22,000 patients miss out on getting vital letters because of a computer blunder
Senior bosses at the trust, which has been placed in special measures for two years, have deemed it a 'serious issue'.
An urgent review is underway
An urgent review revealed half of the letters required no further medical action, but the remaining unchecked ones may have had adverse outcomes.
Worcestershire Royal Hospital, ran by the trust, was described as being 'in meltdown' during one of the busiest winters ever recorded for the NHS.
Two patients died in its over-crowded corridors, one after waiting 35 hours for a bed. A third was killed after accidentally choking on their drip feed cord.
The deaths, which all happened between New Year’s Day and Tuesday January 3, followed a week of enormous pressure on the A&E department.
Nurses were reportedly left in tears as a result of the surge in demand, and patients were stored on trolleys 'three deep' in the corridor.
The deaths followed a string of scandals to hit the trust over the last two years.
In 2012, the trust paid out more than