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Abstract
Aim.This study aimed to determine the relationship between lifestyle and cardiac self efficacy among people with heart failure.
Background. As a common disease, heart failure is a major cause of death and disability in the world. In the treatment of heart failure patients, there is a special emphasis on lifestyle modification. In order to improve the lifestyle of patients with heart failure, cognitive-behavioural factors such as cardiac self-efficacy can be considered.
Method. This descriptive correlational study was conducted on 227 patients with heart failure referred to cardiology clinics of hospitals affiliated to Isfahan University of Medical Sciences. The data gathering tool  consisted of three sections: demographic form, Sullivan's cardiac self efficacy questionnaire and health-promoting lifestyle profile. The data were analysed in SPSS, version 16.
Findings.The mean score of cardiac self-efficacy was 58.45±25.92 and the mean score of total lifestyle was reported 54.45±16.27. A statistically significant direct relationship was found between the mean score of total lifestyle and the mean score of cardiac self-efficacy (r=0.463, p≤0.0001). The Pearson correlation coefficients showed a direct correlation between the scores of all dimensions of lifestyle and score of cardiac self-efficacy (In all cases, p≤0.0001).
Conclusion: There is a positive and significant correlation between lifestyle and cardiac self efficacy of patients with heart failure.

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Abstract
Aim. This study was conducted to examine the effect of teach-back training on lifestyle of people with heart failure.

Background. Lifestyle is a determining factor in the development and progression of cardiovascular disease, so the patient's adherence to therapeutic regimen (medication, diet, and physical activity) guarantees a healthy lifestyle. 

Method. This quasi-experimental study was conducted on 80 individual with heart failure who were admitted to the coronary care units (CCUs) and post coronary care units (PCCUs) of teaching hospitals affiliated to Zahedan University of Medical Sciences, Iran, in 2019. The patients were selected using the convenience sampling method and randomly placed into intervention and control groups. The tools used to collect the data included a demographic information form and Health-Promoting Lifestyle Profile II (HPLP II) questionnaire (HPLP2). The lifestyle questionnaire was completed by the participants in both groups in two stages, before and three months after the intervention. In the intervention group, lifestyle promotion training was performed individually using a teach-back method in 4 sessions, each lasting 30 to 60 minutes. Participants in control group received conventionally lifestyle promotion training. The data were analyzed using SPSS-22 software via the independent samples t-test, paired samples t-test, and chi-square test.

Findings. There was no statistically significant difference between groups in terms of demographic characteristics. Before intervention, no statistically significant difference was found between the mean score of total lifestyle, in the intervention and control group (110.82±48.93 and 103.38±37.23, respectively). (P=0.45). Three months after intervention, the mean score of total lifestyle in intervention group was significantly higher than that of control group (137.80±54.36 against 113.23±37.77) (p≤0.0001). After intervention, the mean score of domains of lifestyle in the intervention group (except for interpersonal communication domain) were significantly higher than that of control group.
Conclusion. The results of the present study showed that teach-back training promoted lifestyle and its domains (except for interpersonal communication domain) in people with heart failure. It is recommended that nurses use this training method to improve lifestyle in people with heart failure.