Abstract
Aim. The purpose of this study was to compare the effect of “acceptance and commitment therapy” and “stress inoculation training” on stress symptoms in people with broken heart syndrome.
Background. Stress is considered to be the main driving force of broken heart syndrome, while broken heart syndrome also causes stress. It seems that training the patient for correct use of coping strategies during stressful events is effective in preventing recurrence.
Method. In this quasi-experimental pre-test post-test design with control group, 62 people referred to Tohid Hospital in Sanandaj during 2016-2017 and had been diagnosed as with broken heart syndrome were considered as accessible population, out of which 30 patients were recruited by convenience sampling method and randomly assigned to three groups. Research tool was the stress syndrome scales in Persian language.  For intervention groups, the acceptance and commitment therapy and stress inoculation training interventions was conducted in weekly sessions. The questionnaire were filled out before intervention, after intervention and one month after intervention by the three groups. Data were analyzed in SPSS using descriptive and inferential statistics.
Findings. Compared with control group, acceptance and commitment therapy (F=87.65, P≤0.0001) and stress inoculation training (F=61.18, P≤0.0001) were effective in reducing stress symptoms and the effect of the acceptance and commitment therapy was remarkable. In addition to the stability of the effect of both interventions one month after intervention, the effect of acceptance and commitment therapy was found to be superior to stress inoculation training.
Conclusion. Both modalities; especially acceptance and commitment therapy, can be used as effective methods with wide applicability in preventing and reducing symptoms of stress and improving the status of people with broken heart syndrome.

Abstract
Aim. The aim of this study was to compare the effect of mindfulness-based cognitive therapy and acceptance and commitment therapy on sleep quality and health promoting lifestyle behaviors in patients with heart failure.
Background. Consequences of heart failure create problems with sleep quality and lifestyle that affect the course of the disease. Mindfulness-based cognitive therapy and acceptance and commitment therapy are some of the potential effective interventions on those.
Method. The present study was a quasi-experimental with a pretest-posttest design and a control group with quarterly follow-up. The sample size was 45 people which were purposefully selected and then randomly assigned to two experimental groups (n=30) and one control group (n=15). Data were collected in three stages using the Sleep Quality Index Pittsburgh  of Boyce et al. (1989) and the Health-Promoting Lifestyle Questionnaire of Walker et al. (1987). Mindfulness-based cognitive therapy and acceptance and commitment therapy for experimental groups were performed and data analysis was performed in SPSS-25 software through analysis of covariance.
Findings. Both acceptance and commitment therapy and mindfulness-based cognitive therapy in post-test and follow-up (F=181.224, P≤0.0001) and (F=62.315, P≤0.0001), improved sleep quality and health-promoting lifestyle behaviors when compared to the control group. Despite the effect of both interventions, the superiority of acceptance and commitment therapy (P< 0.001) on health promoting lifestyle was found. There was no statistically significant difference between two interventions (P=0.967) in terms of improving sleep quality.
Conclusion. According to the results, both interventions were effective on sleep quality and health-promoting lifestyle behaviors, especially acceptance and commitment therapy was more effective on health-promoting lifestyle behaviors, so, in medical settings it can be used along with medical treatments for patients with heart failure.

Abstract
Aim. This study was conducted to compare the effect of “mindfulness-based cognitive therapy” and “acceptance and commitment therapy” on fatigue and quality of life in men with heart failure.
Background. Fatigue, as one of the important symptoms and complications of heart failure, affects the quality of life of the patients, their self-care and daily task performance. Mindfulness-based cognitive therapy and acceptance and commitment therapy may have an effect on these problems.    

Method. This research was semi-experimental with a pre-test post-test design and control group within a three-month follow-up period. Forty five men with heart failure were purposefully selected and randomly allocated to two experimental groups and one control group (15 people in each group). Data were collected in three stages using the Iowa Fatigue Scale, and Minnesota Living with Heart Failure Questionnaire. Data analysis was done in SPSS-25 software with mixed analysis of variance test.

Findings. After intervention and in follow-up stages, both mindfulness-based cognitive therapy and acceptance and commitment therapy were effective on fatigue and quality of life in men with heart failure. The follow-up test showed a greater effect of acceptance and commitment therapy on quality of life and no statistically significant difference was found between the experimental groups in terms of effect on fatigue. 

Conclusion. Both interventions, especially acceptance and commitment therapy, can be used as effective interventions on fatigue and quality of life along with medical treatments for men with heart failure in medical centers.