November was the worst month on record for hospital waiting figures in the North West and nationally.
According to the Irish Nurses and Midwives Organisation, 431 people were waiting on trolleys or chairs in Sligo University Hospital last month compared to 198 the same time last year.
Letterkenny University Hospital sees a rise over the last three years going from 481 patients in 2016, 502 in 2017 and 581 in November this year.
Nationally there were 9,679 people waiting which is an 11% increase on the same time last year and more than twice compared to 2006; a 107% increase.
The INMO says that one of the main reasons is due to understaffing and low pay levels and according to a HSE census, as of September 2018 there were 227 fewer nurses in the country compared to December 2017.
With a few weeks still to go, 2018 has also been the worst year on record surpassing 100,000 patients for the first time.