Heart failure is one of the major challenges in the healthcare systems of all countries [1]. The American Heart Association has reported that heart disease is responsible for 22% of deaths every year [2, 3]. In Iran, heart failure is the most common cause of hospitalization because about 3,700 per 100,000 Iranians suffer from heart failure [4]. However, impaired functional ability is one of the most important consequences of this disease, and patients experience limitations in occupational, familial, and social responsibilities, which consequently affect the quality of life of these patients [5]. Therefore, due to the chronic, progressive, and irreversible nature of this disease, decreasing the anxiety and improving the quality of life in these patients are among the most important responsibilities of the healthcare systems [6]. In this regard, holding educational interventions is one of the most important measures taken to improve awareness and subsequently reduce anxiety and improve the quality of life of these patients [6, 7]. Although many studies in the last decade have examined the impact of education on the quality of life of patients with heart failure, they have used traditional educational methods such as lectures, educational booklets, and pamphlets. [8]. A study has suggested that up to 40–80% of medical information is immediately forgotten and much of the information recalled is inaccurately retained [9]. Therefore, in recent years, due to being client-centered, new educational approaches have received much attention in patient education [10].

In this regard, multimedia and teach-back education methods have been emphasized because of their important role in active learning in patients [11]. Multimedia education, as a new educational method makes the transfer of the content easier, deeper and more attractive through the use of images, videos and audio, consequently leading to better learning than traditional methods in learners [12]. In addition, an intervention that has been shown to be effective on improving information retention and understanding is the teach-back method [13]. The Teach Back/Show Back Method is a teaching technique [14], In this method, the instructor teaches the client in a simple and understandable language, using no specific medical terms, and the client is then asked to retell his/her understanding in his/her own language. Thereafter, if the client did not understand the materials well, the instructor repeats them until the client fully understands them. Accordingly, this process allows the nurses to evaluate the patient's understanding and the accuracy or otherwise of his/her information [14, 15].

On the other hand, educating patients is one of the most important tasks of nurses to reduce anxiety, improve self-care, and promote the quality of life of these patients [16‐18]. Anxiety disorders in patients with heart failure are common and associated with adverse outcomes such as reduced adherence to treatment, poor function, frequent hospitalization, and decreased quality of life [19]. It is necessary for the treatment team, especially nurses, to play an important role through educational interventions in reducing anxiety and improving the quality of life in patients with heart failure [20]. Although the scientific texts mostly emphasize using new methods in educating patients, examination of some scientific literature showed that few studies have used a combination of methods in Iran and other countries. Most of the educational materials for patients in hospitals and health centers in Iran are based on educational pamphlets. Therefore, the present study aimed to examine the effect of multimedia education together with teach-back method on the quality of life and cardiac anxiety in patients with heart failure in the south of Iran, in 2020.

The present study is a non-blinded, randomized controlled study conducted in one of the specialized heart hospitals in the south of Iran from April to October 2020. Because of the obvious nature of the intervention, patients and field researchers could not be blinded. Data collection and analysis was conducted by a neutral researcher who was not involved in data acquisition. Design of the study was recorded at the clinical trials center (IRCT20190917044802N1).

In the current study, the inclusion criteria were patients with heart failure (class I to III) aged less than 60 years old (confirmed by the cardiologists based on their echocardiographic findings and New York Heart Association (NYHA) Functional Classification); patients with no speech, vision, and hearing impairments; literacy and ability to talk and answer questions. Further, the exclusion criteria were patients who were absent in more than two sessions; those with mental illnesses such as Alzheimer’s disease, acute cerebrovascular diseases, or chronic illnesses such as Alcoholic liver disease (ALD) (i.e. cirrhosis), cancer, rheumatoid arthritis, or acute heart failure; and patients who were not able to communicate. In the present study, CONSORT (Consolidated Standards of Reporting Trials) checklist was used for determining the quality of randomized controlled trials [21]. The sample size for this study was calculated based on Abbasi et al.’s study with a power of 80% and α = 0.05, using a formula [22]. Therefore, about 37 patients were decided to be enrolled in each group, but given the loss of about 10% of the samples during the study, the sample size was finally considered 40 people in each group.

The first author invited and registered 130 patients to participate in the study by sequential sampling. Of them, 10 patients who were reluctant to participate in the study or did not meet the inclusion criteria were excluded. Therefore, the remaining 120 patients were then allocated randomly to the three groups by the second author, including a control group, intervention group A (multimedia education), and intervention group B (multimedia education together with teach-back method). Thereafter, 120 cards, including 40 cards labeled A (intervention group with multimedia education), 40 cards labeled B (intervention group with multimedia education together with Teach-Back method), and 40 cards labeled C (control group), were prepared. These 120 cards were then put in an envelope and each patient was asked to draw out one card randomly. Each card labeled A, B, and C, were the two intervention groups and one control group. Figure 1 presents the consort flow diagram of the participants throughout the study (Fig. 1). At the beginning of the study, the researcher explained about the objectives of the educational program and emphasized the importance of the participants’ punctuality to achieve better results at the end. The corresponding author was responsible for teaching and leading the group discussion in the both intervention groups.

The films (educational CDs) were specific multimedia used for the intervention group (the intervention group A); they were screened in four sessions, each one lasting for 45 min. The content of the educational films was prepared in consultation with a cardiologist, a nutritionist, a psychologist, and a number of nursing professors. Of note, the films were produced in one of the virtual education centers of Fasa University of Medical Sciences in the south of Iran. In this regard, the content of these educational CDs included the signs and symptoms of heart failure, methods of prevention of heart complications, methods of drug consumption and diet regimen in patients with heart failure, and relaxation techniques used in order to control anxiety and live a happier life.

In the intervention group B, teach-back method was used after the film screening. Accordingly, both film screening and teach-back learning performed in four 75-min sessions in this group. Thus, the patients were asked to reflect on what they had watched in the films; then, they were requested to reflect on their experiences and express them. These sessions continued in the form of group discussions, questions and answers, responses to the patients' ambiguities and questions, and feedback to them. Finally, the patients were asked to talk about their care plans in the future. In this method, education continued until the participants fully understood the contents of the educational films, and if any patient had any questions, he/she was provided with the needed explanation in simple language. For example, the patients were asked to talk about their diet plans based on what they have learned from the educational films and explanations.

In the control group (group C), the educational program was performed according to the hospital's daily routines such as the ward nurses’ education and the educational package presentation.

To collection the data, we used the demographic questionnaire (age, sex, marital status, level of education, comorbidities, level of heart failure), Minnesota living with heart failure questionnaire (MLHFQ), and Cardiac Anxiety Questionnaire (CAQ). Finally, the research assistant, who was not aware of the allocation of participants in the groups, distributed and gathered the questionnaires before, after (immediately), 1 month, and 3 months after the intervention.

Out of 120 patients included in this study, 80 (66.7%) were men and 40 (33.3%) were women. The patients’ age ranged was 20–60 years, with a mean of 49.54 ± 2.74 years old. There was no significant difference in demographic variables among the intervention and control groups (Table 1).

Repeated Measures ANOVA showed no significant differences were also found in the mean scores of the quality of life and cardiac anxiety in the intervention and control groups before performing the educational intervention. However, a significant difference was observed in the mean score of quality of life and cardiac anxiety in the intervention and control groups immediately after, 1 month, and 3 months after the educational intervention (P < 0.05) (Tables 2, 3).

The post hoc test (Tukey test) was used to examine the difference among the means. No significant differences were found in the mean scores of quality of life and cardiac anxiety in the intervention and control groups before the educational intervention. However, a significant difference was observed in the mean score of quality of life (P < 0.01) and cardiac anxiety (P < 0.001) in the intervention and control groups immediately after, 1 month, and 3 months after the intervention. Also, the findings of this study revealed the differences mean scores of quality of life and cardiac anxiety in multimedia education together with teach-back method was more than control groups and multimedia education group (Tables 4, 5).

Heart failure is a debilitating and deadly chronic disease that affects various aspects of patients' quality of life. It is also associated with high complications and death, as well as a significant amount of health care cost [27]. Patients with heart failure have a poor quality of life due to having insufficient knowledge on the acceptance and adherence to the correct treatment regimen and timely diagnosis and control of the related symptoms [28]. Patient’s education is the main key to have effective management and control of heart failure. If a timely diagnosis and a proper patient’s education for health care be established, one can prevent or delay the complications of heart failure and then promote patients’ quality of life [29].

The results of the present study indicated that both multimedia education and multimedia education together with teach-back method were effective in reducing cardiac anxiety and promoting quality of life in patients with heart failure compared to traditional methods. Also, it was found that multimedia education together with teach-back method was more effective than multimedia education alone in reducing cardiac anxiety and promoting quality of life of patients with heart failure.

In our study, it was found that multimedia education reduces cardiac anxiety and increases the quality of life of the heart patient one day, 1 and 3 months after the intervention. Consistent with this study, other studies have reported the effectiveness of multimedia education in reducing anxiety and increasing self-care and quality of life. In this regard, findings of the study carried out by Kola et al. supported the use of the multimedia approach increased the self-care in one day before and fore and eight weeks after discharge in patients with heart failure, and increasing self-care improves the quality of life in these patients [30]. Bakogiannis et al. also shows that the use of the multimedia educational of heart failure can increase quality of self-care and consequently the quality of life in these patients [31]. The study conducted by Abbasi et al. also showed that the multimedia educational method was effective on increasing the level of awareness and promoting self-care behaviors and the quality of life of patients with heart failure compared to traditional teaching methods [22].

Boyde et al. also stated that multimedia educational intervention can be effective in decrees cardiac anxiety and increase the level of health and quality in people with heart failure and consequently reducing their readmissions [32]. The above studies examined the multimedia educational approach had more positive effects on self-care behaviors and the quality of life in patients with heart failure. This similarity may be due to the educational approach and the patient population being similar. The study conducted by Torabizadeh et al. and Boyer et al. also showed that the multimedia educational caused a reduce anxiety in patients with heart diseases. This finding is consistent with the present study [33, 34].

In the present study, multimedia education together with teach-back method reduces cardiac anxiety and increases the quality of life of the heart patient one day, 1 and 3 months after the intervention. Rahmani et al. stated that teach-back method increased knowledge; performance and quality of life in heart failure patients immediately after teachback education and 3 months after discharge [35]. Also, study of Kola et al. show teach-back method increasing the level of knowledge led to promote of self-care behaviors, patient-caregiver self-reporting and quality of life in these patients [30]. In addition, Tran et al. showed that teach-back education caused a longer retention of the information learned and improved the effectiveness of health outcomes [36].

Contrary to the findings of present study, Ross et al. showed that the teach-back education was not statistically significant on quality of life scores in patients with heart failure. The reason for this difference can be due to the difference in sample size, sample chosen (stages of HF from NYHA Class I-IV), living conditions and financial considerations [37]. But in line with the present study, Kollia et al. and Klingbeil et al., showed that teach-back method caused a reduce anxiety in patients with heart diseases. This finding is consistent with the present study [27‐38].

In this study, it was also revealed that multimedia education together with teach-back method compared to the multimedia educational method was more effective in reducing cardiac anxiety and increasing the quality of life. Consistent with this finding, Kola et al. state multimedia education together with teach-back training compared with multimedia educational can lead to a higher improvement in patients' knowledge, self-care behaviors and quality of life in patients with heart failure. Because increasing the patients' knowledge led to the promotion of self-care behaviors and quality of life [30]. In line with the present study, Srisuk et al. revealed that the multimedia training along with patient-caregiver collaboration can improve the knowledge levels in the caregivers and also self-care behaviors in patients with heart failure [39].

Although both multimedia education and multimedia education together with Teach-Back education were found to be effective in promoting the quality of life and reducing cardiac anxiety in patients with heart failure, multimedia education together with reflective learning showed a better effectiveness than multimedia education in the long run, which can be due to the longer retention of the information learned using this method. Therefore, it is suggested that managers and policymakers of the health system should use this educational approach to promote the quality of life and self-care behaviors in patients with heart failure and other chronic diseases.