The present study discusses how nurse managers' work-related empowerment has been investigated, in order to determine the level and relationships of empowerment among them. A systematic review was carried out, and a literature search was conducted with certain electronic databases for the period 1990-2009, using the main key words in various combinations. Only nine empirical studies in English were selected for review, in accordance with the requirements for the methodological quality and inclusion criteria. The most common type of study design was a descriptive survey (n = 5), and included various questionnaires, scales, and interviews. Nurse managers' structural, psychological, and work empowerment was found to be high or moderately high. The empowerment of nurse managers correlated positively with job satisfaction, perceived organizational support, role satisfaction, and managerial self-efficacy, and correlated negatively with emotional exhaustion and own health outcomes. Different theoretical approaches ensure a clear understanding of empowerment, but difficulties arise when the findings are synthesized across studies and settings because of the different theoretical frameworks used to conceptualize empowerment.
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