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BACKGROUND A study by Hesketh et al. found that 20% of psychiatric nurses were physically assaulted, 43% were threatened with physical assault, and 55% were verbally assaulted at least once during the equivalent of a single work week. From 2005 through 2009, the U.S. Department of Justice reported that mental health occupations had the second highest average annual rate of workplace violence, 21 violent crimes per 1,000 employed persons aged 16 or older. OBJECTIVE An evaluation of risk factors associated with patient aggression towards nursing staff at eight locked psychiatric units. PARTICIPANTS Two-hundred eighty-four nurses in eight acute locked psychiatric units of the Veterans Health Administration throughout the United States between September 2007 and September 2010. METHODS Rates were calculated by dividing the number of incidents by the total number of hours worked by all nurses, then multiplying by 40 (units of incidents per nurse per 40-hour work week). Risk factors associated with these rates were analyzed using generalized estimating equations with a Poisson model. RESULTS Combining the data across all hospitals and weeks, the overall rate was 0.60 for verbal aggression incidents and 0.19 for physical aggression, per nurse per week. For physical incidents, the evening shift (3 pm – 11 pm) demonstrated a significantly higher rate of aggression than the day shift (7 am – 3 pm). Weeks that had a case-mix with a higher percentage of patients with personality disorders were significantly associated with a higher risk of verbal and physical aggression. CONCLUSION Healthcare workers in psychiatric settings are at high risk for aggression from patients.

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Environmental factors related to physical assault by patients were examined to identify clinical implications warranting further investigation and to test methodology. The concepts of ward conditions (degree of patients' illness, numbers of patients and staff) and ward climate were the focus of the study. Participants were patients and nursing staff on two acute and four long-term psychiatric units in a large neuropsychiatric hospital. Patients and staff were asked to complete the Ward Atmosphere Scale to assess ward mood and climate. Each assault incident was identified from the daily nursing ward report. With each assault occurrence, the nurse manager was asked to complete a questionnaire about environmental conditions at the time of the assault. Most assaults occurred during meal times and afternoons. The most frequent locations were ward corridors and dayrooms. There appeared to be an inverse relationship between assault frequency and number of staff. Crowding rather than total number of patients per ward was suggested as a factor related to assault. Degree of patient acuity seemed to be inversely related to assault frequency. There were suggested trends between assault frequency and a low score on autonomy and a high score on staff control. Clinical implications, ideas for further research, and improved design measures are suggested. The challenge to understand and control this complex phenomenon remains a critical issue for inpatient nursing care.