Over 4,600 people are languishing on waiting lists in Roscommon University Hospital.
Over 3,800 are waiting for their first outpatient consultation and 793 are waiting for an inpatient surgery.
A total of 138 patients have been waiting over 18 months, according to the National Treatment Purchase Fund.
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Councillor Valerie Byrne, from the Roscommon Hospital Action Committee, says the new figures are very worrying.