The Effects of Phase III Cardiac Rehabilitation on the Quality of Life of Patients Undergoing Coronary Artery Bypass Graft

authors:

avatar Elham Alahyari 1 , avatar Ali Mohammad Izadpanah 2 , * , avatar Gholamreza Sharifzadeh 3 , avatar Hamid Reza Mashreghi Moghadam 4

Faculty of Nursing and Midwifery, Birjand University of Medical Sciences, Birjand, IR Iran
East Nursing and Midwifery Research Center, Birjand University of Medical Sciences, Birjand, IR Iran
Infectious Diseases Research Center, Birjand University of Medical Sciences, Birjand, IR Iran
Atherosclerosis and Coronary Artery Research Center, Birjand University of Medical Sciences, Birjand, IR Iran

How To Cite Alahyari E, Izadpanah A M, Sharifzadeh G, Mashreghi Moghadam H R. The Effects of Phase III Cardiac Rehabilitation on the Quality of Life of Patients Undergoing Coronary Artery Bypass Graft. Mod Care J. 2015;12(4):e8665. https://doi.org/10.17795/modernc.8665.

Abstract

Background:

Shortage of rehabilitation services as well as personal and financial problems prevents patients from participating in cardiac rehabilitation programs. Participation in these programs alleviates patients’ perceived inadequacy, improves their quality of life, and prolongs their survival. Thus, there is a clear need to educate cardiac patients and guide them toward patient-centered and home-based rehabilitation programs.

Objectives:

The present study was undertaken to examine the effect of phase III cardiac rehabilitation on the quality of life of patients who had undergone coronary artery bypass graft

Methods:

This quasi-experimental study was done on forty 35 to 75 year-old patients, who were in phase III cardiac rehabilitation after bypass surgery. Patients were selected purposively and were allocated to a control and an experimental group randomly, 20 patients in each group. The groups did not differ significantly regarding patients’ age, body mass index, and the duration of cardiac problems. A demographic questionnaire and the short form 36 quality of life questionnaire were used for gathering data both before and one month after the study intervention. A cardiac rehabilitation educational program was implemented for the patients in the experimental group with six 1.5-hour sessions in three subsequent weeks. Patients in the control group also received the same education in four sessions, which were held after the posttest. The data were entered in the SPSS (v. 15.0) software and were analyzed by running repeated measure analysis of variance (ANOVA), the paired- and the independent-sample t, the one-way ANOVA, and the Tukey’s post-hoc statistical tests. The level of significance was set at 0.05.

Results:

The pretest mean score of quality of life in the experimental group was 43.6 ± 13.2, which increased to 56.1 ± 9.4 after the intervention (P < 0.001). The pretest-posttest mean difference of the total quality of life scores in the experimental and the control groups was 12.5 and 4.5. This difference was statistically significant (P < 0.001). Moreover, the scores of all domains of quality of life in the experimental group increased significantly after the study (P < 0.001).

Conclusions:

The findings of this study showed that phase III (home-based) cardiac rehabilitation has significant effects on the quality of life of patients, who had undergo coronary artery bypass graft. Given the limited implementation of phase II rehabilitation programs in Iranian hospitals, implementing phase III rehabilitation programs can significantly affect patients’ quality of life after bypass graft surgery.

1. Background

Cardiovascular disease (CVD) is among the most prevalent non-communicable chronic diseases and its global prevalence is increasing progressively (1). It is the first leading cause of death in Iran. The high prevalence of coronary artery diseases (CAD) and its complications accelerates mortality rate, causes disability in a large population of productive workforce, reduces national product, and increases healthcare costs (2).

Coronary artery bypass graft (CABG) is among the most effective modalities for managing CVD. It is currently used for managing 60% of cases of CAD (3, 4). Currently, the number of CABGs, which are done annually around the world, and in Iran, is more than eight million, and 40000, respectively (5). Although CABG improves myocardial oxygenation and alleviates the problems of myocardial ischemia, it cannot overcome all problems associated with CAD. Therefore, regular physical activity is needed to improve quality of life (QOL) and maximize the benefits of CABG (6).

The most important aspects of post-CABG care, include assessing patients’ physical and mental needs, evaluating their understanding of the importance of post-surgery treatments, and improving their QOL for enhancing their treatment compliance (7). Currently, the length of post-CABG hospital stay has been shortened and many patients can recover at home, i.e. without receiving continuous care from healthcare professionals. Consequently, rehabilitating these patients and improving their QOL for facilitating their engagement in physical activities has become particularly important. On the other hand, the severity of CABG-related stress added to the importance of rehabilitation (7, 8). The results of a study by Esmaeili et al. (2007) in Sari, Iran, revealed that most patients had a good QOL after undergoing CABG (9). However, Bahramnezhad et al. (2012) reported a significant decline in QOL after the surgery (10).

Cardiac rehabilitation (CR) is among the most important strategies for increasing the effectiveness of CABG and minimizing complication. It improves cardiac perfusion and reduces the extent of CABG-related myocardial injury (11). Cardiac rehabilitation refers to a set of coordinated and multidisciplinary interventions, which have been developed for improving cardiac patients’ physical, psychological and social functioning (12). It is a combination of physical exercises and education, which can promote patients’ physical performance and long-term health after CABG. Studies have shown that CR improves cardiac health status and reduces cardiac mortality rate by 34% (13). The world health organization also introduced alleviating cardiac symptoms and improving QOL as the goals of CR (14). Participation in CR programs reduces patients’ sense of insufficiency, improves their QOL, alleviates the symptoms of activity intolerance, slows the progression of CAD, decreases the likelihood of subsequent heart attacks, minimizes the serious complications of CAD, and prolongs patients’ survival (15). Mohammadi et al. (2006) found that the rate of cardiovascular accidents among patients, who had participated, and patients, who had refused to participate in a comprehensive CR program ten years after a CABG was 18% and 35%, respectively (16). Nonetheless, these programs are rarely launched by healthcare centers.

A comprehensive CR program is implemented in three phases. Phase I is implemented in hospital settings and during patients’ hospital stay while phase II is launched two to eight weeks after hospital discharge and in a specialized center. Phase III is usually implemented at patients’ homes and aims at helping them reach their maximum level of functional capacity. A key component of the phase III CR is physical exercise (17). In a review study on cardiac patients, Dalal et al. (2010) found that there was no significant difference between the QOL of patients, who had received home-based and center-based CR services (18). Jolly et al. (2003) also reported that post-CABG home-based CR was more effective than center-based CR in improving QOL (19).

In Iran, CR services are rarely provided by healthcare centers. Therefore, there is a clear need for educating patients and guiding them towards patient-centered and home-based CR programs (20).

2. Objectives

As patients, who undergo CABG need a home-based CR program for improving their QOL, this study was undertaken to examine the effects of Phase III CR on patients’ post-CABG QOL.

3. Methods

This two-group pretest-posttest quasi-experimental study was done in 2013 on 40 patients, who had undergone CABG at Ali Ebn-e Abitaleb teaching hospital, Zahedan, Iran. Sampling was done purposively. Patients were included if they had undergone CABG one year to three months before the study, were aged 35 to 75 years, had been treated with a cardiopulmonary machine during CABG, had no previous history of cardiac surgeries or known mental disorders, received no anxiolytic or psychoanalytic agents, had not experienced any unusual postoperative stressful events (such as returning to the operating room), were able to understand and speak Persian, and lived in Sistan and Baluchistan province, Iran. Patients, who opted for withdrawing from the study, were excluded and replaced by other eligible patients. Initially, the aim of the study was fully explained to the participants and their written consent was secured. Then, they were randomly allocated to the experimental and the control groups.

The data collection tool consisted of a demographic questionnaire and the Persian version of short form 36 QOL questionnaire (SF-36). The American association of cardiovascular and pulmonary rehabilitation approved the use of SF-36 for QOL assessment. The SF-36 is the most commonly used and the most comprehensive standardized QOL assessment instrument. It comprises of 36 questions in eight main components including general health (six questions), physical health (ten questions), mental health (six items), social functioning (two questions), bodily pain (two questions), role limitations due to physical health (four questions), role limitations due to emotional problems (three questions), and vitality (three questions) (21). This questionnaire has been trans-culturally adapted and validated for the Iranian context. Montazeri et al. (2006) developed and validated the Persian version of SF-36 and reported that it has satisfactory validity and reliability (22). The questions of the SF-36 are scored on a five-point Likert-type scale from one to five (which stand for excellent, very good, good, relatively bad, and bad, respectively). The one to five metric scoring of each question was changed to 0 - 100 scoring and then, the scores of the questions were added together and divided by the total number of questions, therefore, scores of 0 and 100 represent the lowest and the highest possible level of each domain of SF-36 (22).

Before implementing CR educational program, all patients in both study groups completed the demographic questionnaire and the SF-36. Data collection for patients with low literacy level was performed through interviewing them. Then, the CR educational program was implemented for the patients in the experimental group during six 1.5-hour sessions in three subsequent weeks, two sessions a week. Initially, patients’ educational needs were assessed and included in the educational program. The needs were mainly related to the improvement of QOL and the modification of risk factors. Education sessions were conducted by the first author and through adopting a lecture, question-and-answer, and group discussion teaching methods as well as using teaching aids such as pamphlets and booklets. Educational sessions were mainly related to the anatomy and physiology of the heart, the process of CABG, CVD etiology and risk factors, CVD prevention strategies, lifestyle modifications, prevention of CABG complications, post-CABG permitted level of physical and sexual activities, dietary regimen, medications, smoking, and travelling. In order to clarify any probable ambiguities and answer their questions, we kept contact with the participants by telephone during the study. The participants were asked to refer to the study setting one month after the intervention in order to recomplete the SF-36. As an ethical practice, we also provided the patients in the control group with the same educational sessions, which had been provided for their counterparts in the experimental group. Educations for the patients in the control group were provided in four sessions, which were held after the posttest. Moreover, they were provided with an educational pamphlet and booklet.

The study data were entered into the SPSS (v. 15.0) software. Descriptive statistics was used to describe the data while they were analyzed by running repeated measure analysis of variance (ANOVA), paired- and the independent-sample t, one-way ANOVA, and Tukey’s post-hoc statistical tests. The level of significance was set at 0.05.

4. Results

This study was done on 40 patients, who had undergone CABG. On average, the patients in the experimental and the control groups were aged 60.5 ± 10.9 and 63.33 ± 6.6 years, respectively (P = 0.33). The length of their CVD and body mass index (BMI) were on average 11.3 ± 7.2 and 11.8 ± 6.1 years (P = 0.79) and 23.8 ± 2.5 and 24.6 ± 3.6 (P = 0.43) for the experimental and control groups, respectively. There was no significant difference between the groups regarding variables such as age, BMI, gender, marital and educational status, the duration since CVD, and the history of hypertension, diabetes mellitus, and hyperlipidemia (Table 1).

Table 1.

Comparing the Study Groups Regarding the Frequency Distribution of Patients’ Demographic Characteristics

Experimental Group, N = 20, Frequency (%)Control Group, N = 20, Frequency (%)P Value
Gender0.53
Male8 (40)11 (55)
Marital status1
Married15 (75)15 (75)
Literacy1
Illiterate7 (35)12 (60)
Primary and secondary6 (30)4 (20)
High school and higher7 (35)4 (20)
History of hypertension10 (50)12 (60)0.75
History of diabetes mellitus2 (10)6 (30)0.23
History of hyperlipidemia9 (45)15 (75)0.053

The pretest mean-scores of QOL in the experimental and the control groups were 43.6 ± 13.2 and 43.3 ± 6.5, respectively. After the study, these scores increased to 56.1 ± 9.4 and 47.8 ± 6.3, respectively. This between-group difference was statistically significant (P < 0.0001). Moreover, except for the domains of bodily pain, social functioning, and role limitation due to emotional problems, the posttest scores of all other domains of QOL in both groups were significantly higher than the pretest values (Table 2). On the other hand, the pretest-posttest mean difference of the total QOL scores in the experimental and the control groups were 12.5 and 4.5. This difference was statistically significant. Table 3 shows the pretest-posttest mean difference scores of QOL and its domains in the study groups.

Table 2.

Within-Group Comparison of the Scores of Quality of Life (QOL)

Domains of QOLStudy Groups
Experimental Group, N = 20Control Group, N = 20
Before, Mean ± SDAfter, Mean ± SDP ValueBefore, Mean ± SDAfter, Mean ± SDP Value
Total QOL score43.6 ±13.256.1 ± 9.4< 0.0001a43.3 ± 6.547.8 ± 6.3< 0.001a
Physi cal health
Physical functioning35 ± 16.151.3 ± 11.1< 0.001a27.7 ± 9.934.7 ± 9.1< 0.001a
Role limitations due to physical health38.7 ± 23.661.2 ± 27.5< 0.001a40 ± 27.451.2 ± 27.50.009a
General health40.5 ± 15.451 ± 12.6< 0.001a43.2 ± 8.846.7 ± 7.50.001a
Bodily pain46.5 ± 21.355.4 ± 15.3< 0.001a44.2 ± 15.745.3 ± 15.30.16
Mental health
Vitality48.7 ± 12.155 ± 8.4< 0.001a51.5 ± 7.954.2 ± 8.30.004a
Mental health51.4 ± 14.958.8 ± 9.9< 0.001a57.6 ± 8.26.9 ± 590.02a
Social functioning51.2 ± 21.861.2 ± 17.20.002a53.7 ± 17.253.7 ± 15.20.96
Role limitations due to emotional problems56.7 ± 32.671.7 ± 32.90.03a58.3 ± 32.961.7 ± 29.20.16
Table 3.

Comparing the Study Groups Regarding the Scores of Quality of Life (QOL) and its Domains

Domains of QOLStudy GroupsP Value
Experimental Group, N = 20, Mean ± SDControl Group, N = 20, Mean ± SD
Changes in total QOL score12.5 ± 6.64.5 ± 2.9< 0.001a
Physical health
Physical functioning16.2 ± 8.27 ± 5.5< 0.001a
Role limitations due to physical health22.5 ± 17.911.2 ± 17.20.05a
General health10.5± 7.83.5 ± 40.001a
Bodily pain8.9 ± 8.61 ± 3.1< 0.001a
Mental health
Vitality6.3 ± 7.22.8 ± 3.80.06
Mental health7.4 ± 8.21.4 ± 2.30.003a
Social functioning10 ±12.60 + 00.001a
Role limitations due to emotional problems15 ± 27.53.3 ± 10.20.08

5. Discussion

This study was undertaken to examine the effect of phase III CR on patients’ post-CABG QOL. Before the study intervention, there was no significant difference between the groups regarding QOL and its domains, denoting the homogeneity of the groups at baseline. Therefore, post-intervention significant difference between the groups regarding the total score of QOL and the scores of QOL domains can be attributed to the effectiveness of the implemented CR educational program.

The study findings revealed that in the experimental group, the increases in the scores of all domains of QOL were significantly larger than the control group. In addition, except for the scores of social functioning, bodily pain and role limitations due to emotional problems domains, the scores of other domains of QOL increased significantly in the control group. This finding can be attributed to partial recovery from heart problems after undergoing CABG. The main goals of CABG are to prolong life, alleviate chest pain and improve QOL (23, 24). Many studies in different countries have shown significant improvement in QOL after CABG (25-29). Besides, significant increases in the scores of some domains of QOL in the control group may be due to patients’ increased awareness of and sensitivity to QOL-related issues. The study pretest might have sensitized the patients in the control group to QOL and hence, they might have attempted to acquire information from different sources in order to improve their QOL. This finding denotes that the patients in the control group have not been inactive after undergoing CABG. The findings of the present study are in line with the findings reported by Falcoz et al. (2006) and Moafi et al. (2011). They found that the scores of all domains of QOL increased significantly in both groups after several weeks from implementation of the CR programs (28, 30). Taylor et al. (2004) also reviewed twelve studies systematically and reported that QOL increased significantly in both control and exercise-based rehabilitation groups (31).

5.1. Conclusion

The findings of this study showed that phase III (home-based) CR has significant effects on the QOL of patients who undergo CABG.

In many hospitals of Iran, CR programs are not implemented officially. Currently, only 10% of Iranian hospitals have active rehabilitation centers. Besides, patients encounter different personal and financial problems when using services provided by such centers. Therefore, they need education in order to pursue home-based CR programs and improve their QOL. Implementing home-based CR programs by community health nurses and other legitimate professionals and centers is recommended to enhance patients’ participation in rehabilitation programs. Absolute prerequisites for the implementation of such programs are provision of patient and public education as well as special attention to nurses’ role in providing post-discharge educations.

Acknowledgements

References

  • 1.

    Ford ES, Capewell S. Coronary heart disease mortality among young adults in the U.S. from 1980 through 2002: concealed leveling of mortality rates. J Am Coll Cardiol. 2007;50(22):2128-32. [PubMed ID: 18036449]. https://doi.org/10.1016/j.jacc.2007.05.056.

  • 2.

    Nouri T, Layeghi O. Third level prevention in patients who have coronary artery bypass graft (Cardiac rehabilitation) [ in Persian ]. 1 ed. Tehran: Mahtab; 2006.

  • 3.

    Hadaegh F, Harati H, Ghanbarian A, Azizi F. Prevalence of coronary heart disease among Tehran adults: Tehran Lipid and Glucose Study. East Mediterr Health J. 2009;15(1):157-66. [PubMed ID: 19469439].

  • 4.

    Serruys PW, Unger F, Sousa JE, Jatene A, Bonnier HJ, Schönberger JP. Comparison of coronary-artery bypass surgery and stenting for the treatment of multivssel disease. N Engl J Med. 2010;344(15):1117-25.

  • 5.

    Esteki Ghashghaei F, Sadeghi M, Yazdekhasti S. A review of cardiac rehabilitation benefits on physiological aspects in patients with cardiovascular disease. [ in Persian ]. 2011;7(5 supl):706-15.

  • 6.

    Treat-Jacobson DJ, Lindquist R. Exercise, quality of life, and symptoms in men and women five to six years after coronary artery bypass graft surgery. Heart Lung. 2007;36(6):387-97. [PubMed ID: 18005800]. https://doi.org/10.1016/j.hrtlng.2007.01.002.

  • 7.

    Sanaie N, Nejati S, Zolfaghari M, Alhani F, KazemNejad AT. he effect of family-centered empowerment in self efficacy and self esteem in patients undergoing coronary bypass graft surgery [ in Persian ]. J Res devel Nurs Mid. 2014;10(2):24-53.

  • 8.

    Ignatavicious DD, Workman ML, Mishler MA. Medical- Surgical Nursing Across the Health care Continuum. 3 ed. Philadelphia: W B Saunders Co; 1999.

  • 9.

    Esmaeili Z, Ziabakhsh Tabari SH, Vazezzadeh N, Mohamadpour R. Quality of Life after Coronary Artery Bypass Grafting in the city of Sari in 2004 - 2006 [ in Persian ]. J Mazandaran Univ Med Sci. 2007;17(61):170-4.

  • 10.

    Bahramnezhad F, Mohammadi Y, Asadi Noghabi AA, Seif H, Amini M, Shahbazi B. Comparative study on quality of life in patients after percutaneous transluminal coronary angioplasty and coronary artery bypass graft surgery [in Persian ]. Cardiovas Nurs J. 2012;1(2):8-15.

  • 11.

    Eftekhar B, Toofan Tabrizi M, Shakouri SK, Aalavi Milani S, Kazemi L. The effects of cardiac rehabilitation on physical tolerance in patients after coronary artery bypass graft. J Birjand Univ Med Sci. 2010;16(4):13-8.

  • 12.

    Leon AS, Franklin BA, Costa F, Balady GJ, Berra KA, Stewart KJ, et al. Cardiac rehabilitation and secondary prevention of coronary heart disease: an American Heart Association scientific statement from the Council on Clinical Cardiology (Subcommittee on Exercise, Cardiac Rehabilitation, and Prevention) and the Council on Nutrition, Physical Activity, and Metabolism (Subcommittee on Physical Activity), in collaboration with the American association of Cardiovascular and Pulmonary Rehabilitation. Circulation. 2005;111(3):369-76. [PubMed ID: 15668354]. https://doi.org/10.1161/01.CIR.0000151788.08740.5C.

  • 13.

    Stephens MB. Cardiac rehabilitation, hand-out 960. Am Fam Physician. 2009;80(9):955-9. [PubMed ID: 19873962].

  • 14.

    Lie I, Arnesen H, Sandvik L, Hamilton G, Bunch EH. Predictors for physical and mental health 6 months after coronary artery bypass grafting: a cohort study. Eur J Cardiovasc Nurs. 2010;9(4):238-43. [PubMed ID: 20219433]. https://doi.org/10.1016/j.ejcnurse.2010.02.001.

  • 15.

    Williams MA, Ades PA, Hamm LF, Keteyian SJ, LaFontaine TP, Roitman JL, et al. Clinical evidence for a health benefit from cardiac rehabilitation: an update. Am Heart J. 2006;152(5):835-41. [PubMed ID: 17070142]. https://doi.org/10.1016/j.ahj.2006.05.015.

  • 16.

    Mohammadi F, Taherian A, Hosseini MA, Rahgozar M. Effect of home-based cardiac rehabilitation quality of life in the patients with myocardical infarction [ in Persian ]. J Rehabilitation. 2006;7(3):11-9.

  • 17.

    Wood SL, Sivarajan ES, Motzer S, Bridges EJ. Cardiac nursing. 6 ed. Philadelphia: Lippincott Williams and Wilkins; 2010.

  • 18.

    Dalal HM, Zawada A, Jolly K, Moxham T, Taylor RS. Home based versus centre based cardiac rehabilitation: Cochrane systematic review and meta-analysis. BMJ. 2010;340:5631. [PubMed ID: 20085991]. https://doi.org/10.1136/bmj.b5631.

  • 19.

    Jolly K, Lip GY, Sandercock J, Greenfield SM, Raftery JP, Mant J, et al. Home-based versus hospital-based cardiac rehabilitation after myocardial infarction or revascularisation: design and rationale of the Birmingham Rehabilitation Uptake Maximisation Study (BRUM): a randomised controlled trial [ISRCTN72884263]. BMC Cardiovasc Disord. 2003;3:10. [PubMed ID: 12964946]. https://doi.org/10.1186/1471-2261-3-10.

  • 20.

    Ghalghamash R, Goosheh B, Keyhani M. Importance of phase І of cardiac rehabilitation [ in Persian ]. J Med Counc IR. 2006;24(2):123-32.

  • 21.

    Seyam S, Heidarnia AR, Sadat Tavafian S. Quality of life and factors related to it in cardiovascular patients after heart surgery. J Birjand Univ Med Sci. 2013;19(6):33-41.

  • 22.

    Montazeri A, Goshtasbi A, Vahdaninia MAS. The short form health survey (SF-36): translation and validation study of the Iranian version [ in Persian ]. Payesh. 2006;5(1):49-56.

  • 23.

    Duits AA, Boeke S, Taams MA, Passchier J, Erdman RA. Prediction of quality of life after coronary artery bypass graft surgery: a review and evaluation of multiple, recent studies. Psychosom Med. 1997;59(3):257-68. [PubMed ID: 9178337].

  • 24.

    Zamvar V. Reporting systems for cardiac surgery. BMJ. 2004;329(7463):413-4. [PubMed ID: 15321882]. https://doi.org/10.1136/bmj.329.7463.413.

  • 25.

    Jarvinen O, Saarinen T, Julkunen J, Huhtala H, Tarkka MR. Changes in health-related quality of life and functional capacity following coronary artery bypass graft surgery. Eur J Cardiothorac Surg. 2003;24(5):750-6. [PubMed ID: 14583308].

  • 26.

    Panagopoulou E, Montgomery A, Benos A. Quality of life after coronary artery bypass grafting: evaluating the influence of preoperative physical and psychosocial functioning. J Psychosom Res. 2006;60(6):639-44. [PubMed ID: 16731241]. https://doi.org/10.1016/j.jpsychores.2005.11.004.

  • 27.

    Jensen BO, Hughes P, Rasmussen LS, Pedersen PU, Steinbruchel DA. Health-related quality of life following off-pump versus on-pump coronary artery bypass grafting in elderly moderate to high-risk patients: a randomized trial. Eur J Cardiothorac Surg. 2006;30(2):294-9. [PubMed ID: 16829089]. https://doi.org/10.1016/j.ejcts.2006.04.015.

  • 28.

    Falcoz PE, Chocron S, Laluc F, Puyraveau M, Kaili D, Mercier M, et al. Gender analysis after elective open heart surgery: a two-year comparative study of quality of life. Ann Thorac Surg. 2006;81(5):1637-43. [PubMed ID: 16631649]. https://doi.org/10.1016/j.athoracsur.2005.12.004.

  • 29.

    Zhang Z, Mahoney EM, Spertus JA, Booth J, Nugara F, Kolm P, et al. The impact of age on outcomes after coronary artery bypass surgery versus stent-assisted percutaneous coronary intervention: one-year results from the Stent or Surgery (SoS) trial. Am Heart J. 2006;152(6):1153-60. [PubMed ID: 17161069]. https://doi.org/10.1016/j.ahj.2006.06.011.

  • 30.

    Moafi S, Zolaktaf V, Rabiei K, Hashemi M, Tarmah H. Effects of home-based exercise rehabilitation on quality of life after coronary artery bypass graft and PCI early post-discharge. Tabib-e-Shargh. 2011;13(6):26-30.

  • 31.

    Taylor RS, Brown A, Ebrahim S, Jolliffe J, Noorani H, Rees K, et al. Exercise-based rehabilitation for patients with coronary heart disease: systematic review and meta-analysis of randomized controlled trials. Am J Med. 2004;116(10):682-92. [PubMed ID: 15121495]. https://doi.org/10.1016/j.amjmed.2004.01.009.