Almost nine thousand patients were on trolleys at hospitals around the country last month - the worst March figure in over a decade.
The Irish Nurses and Midwives Organisation says the figure confirms the extent of the growing crisis.
St Vincents Hospital in Dublin saw the biggest increase between March 2014 and March 2015 - at 237 per cent.
Letterkenny General Hospital's increase was relatively small, with 281 people on trollies in the Emergency Department and wards in March 2015, compared to 277 in 2014.
In 2013, the figure was 180.
In Sligo General Hospital, the figure is actually falling, with 235 people on trollies last month, 238 in March 2014 and 242 in March 2013.