(The Center Square) - Health care workers in Altoona held a vigil Monday night to demand increased safety for hospital employees. The event came weeks after UPMC emergency room technician Travis Dunn was brutally attacked by a patient, leaving him with a skull fracture and brain bleed among other injuries. Between the physical demands of their jobs and the volatility of working with patients, health care workers are exposed to more on-the-job injuries than most other professions.