Union nurses at UMass Memorial Health Center and HealthAlliance Hospital issued a letter to hospital administrators this morning, urging administrators to meet over layoffs that nurses say have created unsafe patient conditions. The letter, hand-delivered after a press conference and rally in front of UMass Memorial's corporate offices, by nurses in the Massachusetts Nurses Association appeals to administrators to rescind staff cuts that have rippled throughout the financially struggling UMass Memorial system. "We nurses believe (the cuts) are degrading the quality and safety of care for every patient entering the UMass Memorial/Health Alliance system," nurses wrote in the letter to UMass Memorial CEO Eric Dickson.