There were 591 patients waiting on trolleys in Irish hospitals on Tuesday morning.
The Irish Nurses and Midwives Organisation's (INMO) daily trolley watch figures showed 405 patients were waiting in Emergency Departments (EDs), while 186 were in wards elsewhere in the hospitals.
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Tuesday morning's figure was the highest number of patients waiting on trolleys so far this month. A total of 3,011 patients have been forced to wait on trolleys for hospital beds in May.
University Hospital Limerick had the highest number of patients on trolleys on Tuesday, with 105 waiting for a hospital bed.
Cork University Hospital had 54 patients waiting on trolleys, while Letterkenny University Hospital had 47.