Background : Coronary and artery diseases are amongst the most common existed diseases in human societies. Thus considering too much stress that is created after myocardial infarction and the effect which anxiety can have on the treatment process of myocardial infraction patients, This research was carried out to study the effect of applying progressive muscle relaxation of these patients. Materials and Methods: This clinical trail study was done on sixteen patients with myocardial infarction afflicted to the disease two weeks before the beginning of the research.After selecting qualified samples , the patients were divided into two groups of intervention and control. Both groups were matched from view points of age, sex, and the amount of anxiety. In the first day, for each group the cattle anxiety questionnaire was completed and their vital signs were recorded, and then for the intervention group the progressive muscle relaxation technique was done during 3 sequential days and on the whole in 6 sessions. And again after 3days variables were measured. The gathered data were analyzed by SPSS software. Results: In the intervention group anxiety, systolic and diastolic blood pressure had a significant decrease comparing to the control group (P<0.001),while decrease was not significant in the control group. Conclusion: progressive muscle relaxation can reduce the amount of anxiety, and systolic and diastolic blood pressure of the patients with myocardial infarction hospitalized in CCU ward, therefore it can play an effective role as a supplement non-medicinal, simple and cheap treatment for these patients

Keywords: Anxiety, Myocardial infarction, Progressive muscle relaxation.

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