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Background & Aims: pre-operative anxiety is one of the prominent psychological problems among people who are going to have open-heart surgeries. If it is not controlled properly, this problem can cause negative effects on the operation results and the physical status of the patients. Various training tools and methodologies have been proposed till now, but there is no single agreement among researches about the best one. The present research wants to determine the effect of educational videos on pre-operation anxiety among patients undergoing open-heart surgery without pump. Materials & Method: This study was single bind and random clinical trial which conducted by the participation of 60 patient’s candidate for open-heart surgery in the cardiovascular ward of Imam Reza Hospital of Mashhad in 2015. The patients were divided into control and intervention groups randomly and assigned to two groups of 30. 15-minute of educational movie in 2 sessions was shown for patients in the intervention group, but pamphlets and face to face education was applied to those in the control group one day prior to the operation. The anxiety levels in both groups were measured before and after the intervention using Spiel Berger state-trait anxiety inventory. SPSS version 11.5, independent t tests, Mann-Whitney test, paired t test, Wilcoxon test, chi-square test and exact chi-square test were used to analyze the data. Results: the average age of the patients was  years and the highest school degeree among 53.3% of them was elementary school. In pre-intervention phase, no statistically significant difference was observed between the average score of the concealed and obvious anxiety in both control and intervention group members (p>0.05). After the invention, the average obvious anxiety score of those patients in the control group ( ) was significantly less than what was observed in the control group ( ) (p

Keywords: educational movies, pamphlet, open-heart surgery, pre-operative anxiety

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