‘When It Matters Most, Insist on a Registered Nurse! Sweeping changes underway in the nation’s health care delivery system that expose hundreds of thousands of patients to severe risk of harm are the focus of a major new national campaign by the nation’s largest organization of nurses announced today. An unchecked proliferation of unproven medical technology and sharp erosion of care standards are rapidly spreading through the health care system, far outside the media spotlight but frighteningly apparent to nurses and patients, says National Nurses United.