Stressful ethical situations are considered as one of the problems of nursing profession, which disrupts the competence of simultaneous application of knowledge, skills, attitudes, and values in patient care. Since clinical nurses are more exposed to ethical distress due to their nature of job, especially in in critical care and psychiatric wards, this study was conducted to analyze the relationship between three dimensions of moral distress. In this descriptive-correlational study 545 nurses from Tabriz educational centers were selected by census method in 2013-2014. The moral distress scale (MDS) questionnaire was distributed among partcipants and data was collected during nine months. Data were analyzed by SPSS V13, descriptive statistics, Chi-square test, and Kendall's tau-b correlation coefficient. According to the findings, the mean of moral distress was 141.89 ± 29.6 (in the intermediate range). Chi-square test showed the relationship between the dimensions of moral distress (the relation between patient's ignorance, decision-making power, and professional competence) (P <0.05). According to the Kendall's tau-b correlation coefficient test, there was a direct and significant correlation between the dimensions of moral distress (P <0.05). There was a meaningful correlation between the moral distress and the demographic characteristic of the educational level (P <0.05). Considering the direct and meaningful relationship between three dimensions of moral distress (patient's ignorance, decision-making power, and professional competence), each dimension of moral distress affects another as aggravating or modifying factor. Therefore, it is recommended that planners and health care administrators at the macro level provide appropriate programs to increase the nurse's attention and support to patients and reinforce decision-making power and professional competence by increasing the number of nurses and other controlling programs.

Keywords: Nurse, Moral distress, Professional competence, Decision-making power

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