Issues in contemporary cardiac rehabilitation: a historical perspective

Incremental prognostic value of functional impairment assessed by 6-min walking test for the prediction of mortality in heart failure

Natriuretic peptides (NP) are recognized as the most powerful predictors of adverse outcomes in heart failure (HF). We hypothesized that a measure of functional limitation, as assessed by 6-min walking test (6MWT), would improve the accuracy of a prognostic model incorporating a NP. This was a multicenter observational retrospective study. We studied the prognostic value of severe functional impairment (SFI), defined as the inability to perform a 6MWT or a distance walked during a 6MWT < 300 m, in 1696 patients with HF admitted to cardiac rehabilitation. The primary outcome was 1-year all-cause mortality. After adjusting for the baseline multivariable risk model-including age, sex, systolic blood pressure, anemia, renal dysfunction, sodium level, and NT-proBNP-or for the MAGGIC score, SFI had an odds ratio of 2.58 (95% CI 1.72-3.88; p < 0.001) and 3.12 (95% CI 2.16-4.52; p < 0.001), respectively. Adding SFI to the baseline risk model or the MAGGIC score yielded a significant improvement in discrimination and risk classification. Our data suggest that a simple, 6MWT-derived measure of SFI is a strong predictor of death and provide incremental prognostic information over well-established risk markers in HF, including NP, and the MAGGIC score.

Cardiac rehabilitation: Effective yet underutilized in patients with cardiovascular disease

Cardiac rehabilitation is a comprehensive program that treats patients with multiple cardiac conditions including post-myocardial infarction, stable angina, post-coronary artery bypass surgery, chronic heart failure, and peripheral vascular disease with structured exercise, and nutrition and risk factor counseling. It is an effective tool that has been shown to improve not only quality of life but also reduce adverse cardiac events, including death. While the value of cardiac rehabilitation is supported by a large body of evidence and its recommendation by the American Heart Association/American College of Cardiology it is significantly underutilized due to both patient and systemic factors. Continued efforts should be made to remove the obstacles to make cardiac rehabilitation available to all those who qualify.

Predictors of Referral to Cardiac Rehabilitation in Patients following Hospitalisation with Heart Failure: A Multivariate Regression Analysis

Background: This exploratory observational case−control study investigated the rate of referral to cardiac rehabilitation (CR) among patients hospitalised with heart failure (HF) and identified factors associated with referral. Methods: Patients hospitalised with HF as identified by the Victorian Cardiac Outcomes Registry HF study were included. Factors found to be univariately associated with referral were selected for multivariate logistic regression. Results: Among 1281 patients (mean age: 76.9 years; 32.8% HFrEF and 33.9% HfpEF), 125 (9.8%) were referred to CR. Patients referred were younger (73.6 (2.7, 81.5) vs. 80.2 (71.1, 86.5) p < 0.001) and were more likely to be men (72%, p < 0.001). Factors associated with referral included inpatient percutaneous coronary intervention (OR, 3.31; 95% CI, 1.04−10.48; p = 0.04), an aetiology of ischaemic or rhythm-related cardiomyopathy, and anticoagulants prescribed on discharge. Factors that lowered the likelihood of referral included older age, female, receiving inpatient oxygen therapy, and the presence of chronic obstructive pulmonary disease (COPD) or anaemia. Conclusions: The rate of referral to CR following hospitalisation with HF is low. Shortfalls are particularly evident among females, older patients, and in those with COPD or anaemia. Future studies should focus on improving referral processes and translating proven strategies that increase referrals to CR into practice.

Cardiac rehabilitation for coronary artery disease: latest updates

PURPOSE OF REVIEW

To summarize recent innovations in cardiac rehabilitation and provide a view towards the future of cardiac rehabilitation as it adjusts to the pressures of a global pandemic.

RECENT FINDINGS

Although cardiac rehabilitation has been shown to result in a mortality benefit, research continues to enumerate the benefits of cardiac rehabilitation to patient function and quality of life in a growing range of cardiovascular diseases. In addition, new methodologies and new models of cardiac rehabilitation have emerged with the goal of increasing patient referral and participation.

SUMMARY

Cardiac rehabilitation continues to evolve and adapt to serve a growing and diversifying number of patients with cardiovascular disease with the goal of both decreasing mortality and improving patient function.

Cardiac Rehab in the COVID Era and Beyond: mHealth and Other Novel Opportunities

Purpose of Review

The COVID-19 pandemic has forced many center-based cardiac rehabilitation (CBCR) programs to close or limit their usual offerings. In order for patients to continue to benefit from CR, programs need to rapidly adapt to the current environment. This review highlights ways CR has evolved, and reviews the history of CR and recent advancements in telemedicine including remote patient monitoring, and mobile health that can be applied to CR.

Recent Findings

Despite that initial studies indicate that home-based CR (HBCR) is safe and effective, HBCR has faced several challenges that have prevented it from becoming more widely implemented. Many previous concerns can now be addressed through the use of new innovations in home-based healthcare delivery.

Summary

Since its inception, CR has become increasingly recognized as an important tool to improve patient mortality and quality of life in a broad range of cardiac diseases. While there has been little need to modify the delivery of CR since the 1950s, COVID-19 now serves as the necessary impetus to make HBCR an equal alternative to CBCR.

An investigation into whether cardiac risk stratification protocols actually predict complications in cardiac rehabilitation programs?

OBJECTIVES

This study evaluated the capacity of cardiac risk stratification protocols on simple complications that occur during activities of a cardiovascular rehabilitation program.

DESIGN

Observational longitudinal cohort study.

SETTING

Outpatient clinic of cardiovascular rehabilitation.

SUBJECT

Patients diagnosed with cardiovascular disease and/or risk factors.

INTERVENTIONS

Not applicable.

MAIN MEASURES

The relationship between the cardiac risk classes of seven risk stratification protocols and the occurrence of simple complications (such angina, abnormal changes in blood pressure, arrhythmias, fatigue, muscle pain, pallor) was assessed using the chi-square test, and when statistical significance was observed, sensitivity, specificity and accuracy were determined.

RESULTS

About 76 patients were analyzed. The American Association of Cardiovascular and Pulmonary Rehabilitation (AACVPR) protocol showed a statistically significant relationship between simple complications and cardiac risk classes (P-value = 0.046), however the results of sensitivity (0.53), specificity (0.52), and accuracy (0.53) were not significant. The other protocols analyzed were not significant: American College of Sports Medicine (P-value = 0.801), Brazilian Society of Cardiology (P-value = 0.734), American Heart Association (P-value = 0.957), Pashkow (P-value = 0.790), Society French Cardiology (P-value = 0.314), and Spanish Society of Cardiology (P-value = 0.078).

CONCLUSION

The AACVPR protocol showed a significant relationship between the risk classes and the occurrence of simple complications, however, the low values obtained for sensitivity, specificity and accuracy show that it is not useful for this purpose.

CLINICAL TRIALS REGISTRATION

NCT03446742.

What are the prevalence and predictors of psychosocial healthcare among patients with heart disease? A nationwide population-based cohort study

OBJECTIVES

Psychosocial healthcare is recommended, but little is known about how patients perceive the level of care and whether subgroups of patients experience less psychosocial healthcare than others. We examined the prevalence of patient-reported psychosocial healthcare and factors predicting patient-reported lack of psychosocial healthcare among patients with heart disease.

DESIGN

A cohort study.

SETTING

Denmark, nationwide.

PARTICIPANTS

A registry-based random sample of 5000 patients with incident heart disease in 2013.

MEASURES

Patient-reported psychosocial healthcare was obtained from a survey and potential predictors before disease onset from registries. We used multivariable logistic regression analysis to determine predictors of patient-reported lack of care.

RESULTS

We received responses from 56%; 40% reported lacking information on psychosocial aspects, 51% lacking psychosocial rehabilitation and support and 32% reported lacking both types of psychosocial healthcare. The type of heart disease was the strongest predictor of patient-reported lack of psychosocial healthcare, especially among patients with atrial fibrillation (OR: 3.11-3.98). Older age (OR: 1.48-2.05), female gender (OR: 1.27-1.53) and no contact with general practitioner (OR: 1.47-1.84) also predicted patient-reported lack of psychosocial healthcare. Patients outside the labour force (OR: 1.29) and living in the capital region (OR: 1.50) more frequently reported lacking psychosocial rehabilitation and support, and patients with recent (OR: 1.63) or past (OR: 1.33) anxiety or depression and severe comorbidities (OR: 1.34) more frequently reported lacking both types of psychosocial healthcare.

CONCLUSIONS

Many patients with heart disease reported lacking psychosocial healthcare. Importantly, patients who most need psychosocial healthcare are not those who report receiving it. Our results call for action to translate guidelines into clinical practice.

Interrater Reliability Across 7 Established Risk Stratification Protocols in Cardiac Rehabilitation

OBJECTIVE

To analyze the interrater agreement among physiotherapists in using 7 risk stratification (RS) protocols to evaluate participants of cardiac rehabilitation (CR) and the main factors associated with disagreements that emerged during the RS process.

DESIGN

Cross-sectional observational study.

SETTING

Outpatient rehabilitation center.

PARTICIPANTS

Patients (N=72) enrolled in CR with a diagnosis of cardiovascular disease or cardiovascular risk factors. Mean age was 65.62±12.14 y, and mean body mass index (calculated as weight in kilograms divided by height in meters squared) was 29.18±4.56.

INTERVENTIONS

Not applicable.

MAIN OUTCOME MEASURES

The main outcome was to the agreement between 2 physiotherapists in the patients' RS process, using 7 protocols established in the literature for use in CR: American Association of Cardiovascular and Pulmonary Rehabilitation, American College of Sports Medicine, American Heart Association, Sociedade Brasileira de Cardiologia, Sociedad Española de Cardiología, and Société Française de Cardiologie. In addition, the main disagreement factors were assessed.

RESULTS

Interrater agreement was classified as moderate-to-good in the 7 included RS protocols (kappa index between 0.53-0.76). The most important aspects that led to disagreement between physiotherapists were reported in 5 categories. The protocol with the greater agreement index was the American College of Sports Medicine (93.10%; n=67), and the one with the greater disagreement was the American Association of Cardiovascular and Pulmonary Rehabilitation (27.80%; n=20).

CONCLUSIONS

Moderate-to-good interrater agreement among physiotherapists in using 7 RS protocols was observed. Major disagreements were the definition of abnormal hemodynamic responses, rhythm disorders, left ventricular dysfunction, and interpretation of the patient's clinical characteristics.

Energy expenditure during an exercise training session for cardiac patients

Increasing energy expenditure (EE) in cardiac patients remains a challenge. Exercise approaches in cardiac rehabilitation/secondary prevention programs (CR/SP) have consistently resulted in minimal weight loss, due in part to the low exercise-related EE. The purpose of this study was to measure the EE among patients participating in a routine exercise session of Phase III maintenance CR/SP, where a recreational activity was introduced. Twelve overweight/obese male patients with coronary artery disease (aged 62.6 ± 8.5 years) had their total EE measured during a combined aerobic (circuit workout (ACW) and recreational activity) and resistance training (RT) session using a portable gas analyzer. Subjects were instructed to exercise at 60%–70% of heart rate reserve. Activity EE was calculated from total EE and resting EE. The duration of the session was 75.3 ± 1.5 min, of which 59.7 ± 8.8 min were above moderate intensity (3–6 METs). Activity EE was 309 ± 76 kcal, concurring to a total EE of 457 ± 80 kcal (3.9 ± 0.8 METs-h). ACW, recreational activity, and RT fulfilled 34.4% ± 6.4%, 25.0% ± 5.3%, and 14.2% ± 2.7% of the activity EE, respectively. Absolute intensities (METs) were significantly different between the RT (3.9 ± 1.0) and the ACW (6.9 ± 1.8) and recreational activity (5.9 ± 0.8). In conclusion, a combined aerobic and resistance training following standard exercise prescription practices, coupled with a recreational activity, is an effective tool to promote exercise above moderate intensity in male coronary artery disease patients. Clinicians can adopt concepts from recreational activity to develop CR/SP sessions.

Evaluation of an mHealth-Based Adjunct to Outpatient Cardiac Rehabilitation

A pilot study was conducted to determine if a smartphone-based adjunct to standard care could increase the completion rate of a cardiac rehabilitation program (CRP). Based on historical completion rates, 66 participants who were about to commence a hospital-based CRP were randomized so that half received three devices embedded with near-field communication, namely, a smartphone [pre-installed with an application (app) designed specifically for cardiac rehabilitation], portable blood pressure monitor, and weight scale while completing the CRP. The completion rate among participants who were randomized to the intervention group was 88%, compared to 67% in the control group ( = 0.038). This combined with the week-to-week frequency with which participants in the intervention group measured their blood pressure ( 5/week) demonstrated the ability of the intervention to increase the proportion of patients who completed the CRP. No significant differences were found between the treatment groups for the measurements taken at baseline and prior to discharge from the CRP. A statistically significant correlation ( = 0.472; = 0.013) was found between the average time participants walked each day (as estimated via the smartphone app) and participants' six minute walking distance (6MWD) before they were discharged from the CRP (a clinically validated measurement).

Availability, Use, and Barriers to Cardiac Rehabilitation in LMIC

BACKGROUND

Cardiac rehabilitation (CR) is a cornerstone of secondary prevention of ischemic heart disease. It is critically important in low- and middle-income countries (LMIC), where the burden of ischemic heart disease is substantial and growing. However, the availability and utilization of CR in LMIC is not systematically known.

OBJECTIVES

This study sought to characterize the availability, use, and barriers to the use of CR.

METHODS

Electronic databases (Cochrane Library, EMBASE, PubMed, Web of Science) were searched from January 1, 1980 to May 31, 2013 for articles on CR in LMIC. Citations on availability, use, and/or barriers to CR were screened for inclusion by title, abstract, and full text. Data were summarized by region or country to determine the characteristics of CR in LMIC and gaps in the peer-reviewed biomedical publications.

RESULTS

Our search yielded a total of 5,805 citations, of which 34 satisfied full inclusion and exclusion criteria. The total number of CR programs available ranged from 1 in Algeria and Paraguay to 51 in Serbia. Referral rates for CR ranged from 5.0% in Mexico to 90.3% in Lithuania. Attendance rates ranged from 31.7% in Bulgaria to 95.6% in Lithuania, and CR attendance was correlated with higher educational background. The most commonly cited barrier to CR in LMIC was lack of physician referral.

CONCLUSIONS

Our results illustrate that the published reports reflects heterogeneity of CR availability and use in LMIC. Overall, CR is insufficiently available and underutilized. Further characterization of CR in LMIC, especially in Asia and Africa, is necessary to develop targeted strategies to improve availability and utilization. Patient, physician, and systems factors must be addressed to overcome barriers to participation in CR in LMIC.

Contemporary Issues in Cardiac Rehabilitation: Implications for Occupational Therapists

Since the acceptance of the beneficial effects of early mobilisation for patients after myocardial infarction, cardiac rehabilitation has undergone dramatic change. Highly structured and inflexible exercise programmes have given way to flexible and comprehensive modern programmes, which embrace the use of education, counselling and risk factor modification principles. Contemporary skills required by occupational therapists include being able to adapt services to a vast array of cardiac conditions, foster risk factor modification, enhance compliance, tailor education to learning and coping styles, assess the patient's level of risk and need for rehabilitation, and provide accelerated and alternate programmes. This article discusses the principles, directions and benefits of modern cardiac rehabilitation and the implications for occupational therapists.

Analysis of agreement between cardiac risk stratification protocols applied to participants of a center for cardiac rehabilitation

BACKGROUND

Cardiac risk stratification is related to the risk of the occurrence of events induced by exercise. Despite the existence of several protocols to calculate risk stratification, studies indicating that there is similarity between these protocols are still unknown.

OBJECTIVE

To evaluate the agreement between the existing protocols on cardiac risk rating in cardiac patients.

METHOD

The records of 50 patients from a cardiac rehabilitation program were analyzed, from which the following information was extracted: age, sex, weight, height, clinical diagnosis, medical history, risk factors, associated diseases, and the results from the most recent laboratory and complementary tests performed. This information was used for risk stratification of the patients in the protocols of the American College of Sports Medicine, the Brazilian Society of Cardiology, the American Heart Association, the protocol designed by Frederic J. Pashkow, the American Association of Cardiovascular and Pulmonary Rehabilitation, the Société Française de Cardiologie, and the Sociedad Española de Cardiología. Descriptive statistics were used to characterize the sample and the analysis of agreement between the protocols was calculated using the Kappa coefficient. Differences were considered with a significance level of 5%.

RESULTS

Of the 21 analyses of agreement, 12 were considered significant between the protocols used for risk classification, with nine classified as moderate and three as low. No agreements were classified as excellent. Different proportions were observed in each risk category, with significant differences between the protocols for all risk categories.

CONCLUSION

The agreements between the protocols were considered low and moderate and the risk proportions differed between protocols.

The influence of aerobic fitness status on ventilatory efficiency in patients with coronary artery disease

OBJECTIVE

To test the hypotheses that 1) coronary artery disease patients with lower aerobic fitness exhibit a lower ventilatory efficiency and 2) coronary artery disease patients with lower initial aerobic fitness exhibit greater improvements in ventilatory efficiency with aerobic exercise training.

METHOD

A total of 123 patients (61.0±0.7 years) with coronary artery disease were divided according to aerobic fitness status into 3 groups: group 1 (n = 34, peak VO₂<17.5 ml/kg/min), group 2 (n = 67, peak VO₂>17.5 and <24.5 ml/kg/min) and group 3 (n = 22, peak VO₂>24.5 ml/kg/min). All patients performed a cardiorespiratory exercise test on a treadmill. Ventilatory efficiency was determined by the lowest VE/VCO₂ ratio observed. The exercise training program comprised moderate-intensity aerobic exercise performed 3 times per week for 3 months. Clinicaltrials.gov: NCT02106533 RESULTS: Before intervention, group 1 exhibited both lower peak VO2 and lower ventilatory efficiency compared with the other 2 groups (p<0.05). After the exercise training program, group 1 exhibited greater improvements in aerobic fitness and ventilatory efficiency compared with the 2 other groups (group 1: ▵ = -2.5±0.5 units; group 2: ▵ = -0.8±0.3 units; and group 3: ▵ = -1.4±0.6 units, respectively; p<0.05).

CONCLUSIONS

Coronary artery disease patients with lower aerobic fitness status exhibited lower ventilatory efficiency during a graded exercise test. In addition, after 3 months of aerobic exercise training, only the patients with initially lower levels of aerobic fitness exhibited greater improvements in ventilatory efficiency.

Supervised Phase II Cardiac Exercise Therapy Shortens the Recovery of Exercise Capacity in Patients with Acute Myocardial Infarction

[Purpose] To investigate the effects of Phase II cardiac exercise therapy (CET) on exercise capacity and changes in coronary risk factors (CRFs) of patients with acute myocardial infarction (AMI). [Subjects] Thirty male subjects with AMI were divided into an experimental group (EG) and a control group (CG). Another 30 age-matched subjects with patent coronary arteries served as a normal-control group (NCG). [Methods] Subjects in EG (n=20) trained using a stationary bicycle for 30 min at their target heart rate twice a week for 8 weeks. Exercise capacity was defined as the maximal metabolic equivalents (METs) that subjects reached during the symptom-limited maximal exercise test. HR, BP and RPP were recorded. Subjects in EG and CG received exercise tests and screening for CRFs at the beginning of, end of, and 3 months after Phase II CET, while subjects in NCG participated only in the 1st test. [Results] METs of CG did not improve until the 3rd test, while RPP at the 2nd test showed a significant increase. However, EG showed increased METs at the 2nd test without increase of RPP, and increased their high density lipoprotein cholesterol (HDL-C) during the follow-up period between the 2nd and 3rd tests. [Conclusion] Phase II CET shortens the recovery time of exercise capacity, helps to maintain the gained exercise capacity and increases HDL-C in phase III.

Cardiac risk stratification in cardiac rehabilitation programs: a review of protocols

OBJECTIVE

Gather and describe general characteristics of different protocols of risk stratification for cardiac patients undergoing exercise.

METHODS

We conducted searches in LILACS, IBECS, MEDLINE, Cochrane Library, and SciELO electronic databases, using the following descriptors: Cardiovascular Disease, Rehabilitation Centers, Practice Guideline, Exercise and Risk Stratification in the past 20 years.

RESULTS

Were selected eight studies addressing methods of risk stratification in patients undergoing exercise.

CONCLUSION

None of the methods described could cover every situation the patient can be subjected to; however, they are essential to exercise prescription.

Effects of Combined Phase III and Phase II Cardiac Exercise Therapy for Middle-aged Male Patients with Acute Myocardial Infarction

[Purpose] To investigate the effects of cardiac exercise therapy (CET) on exercise capacity and coronary risk factors (CRFs) of patients with acute myocardial infarction (AMI). [Methods] Patients who participated in an 8-week supervised, hospital-based phase II and 6-month home-based phase III CET with monthly telephone and/or home visits were defined as the exercise group (EG) (n=20), while those who did not receive phase II or phase III CET were defined as the no-exercise group (NEG) (n=10). CRFs were evaluated pre- and post-phase II and eight months after discharge. One and two-way repeated measures ANOVA were used to perform intra- and inter-group comparisons. [Results] Thirty men with AMI aged 49.3 ± 8.3 years were studied. EG increased their exercise capacity (METs) (6.8 ± 1.6 vs.10.0 ± 1.9) after phase II CET and was able to maintain it at 8-month follow-up. Both groups had significantly fewer persons who kept on smoking compared to the first examination. High density lipoprotein cholesterol (HDL-C) increased from 38.1 ± 11.0 to 43.7 ± 8.7 mg/dl at follow-up in EG while no significant difference was noted in NEG. [Conclusion] After phase III CET subjects had maintained the therapeutic effects of smoking cessation, and increasing exercise capacity obtained in phase II CET. HDL-C in EG continued to improve during phase III CET.

Value of weight reduction in patients with cardiovascular disease

OPINION STATEMENT

Obesity is an independent risk factor for cardiovascular (CV) disease and contributes markedly to individual CV risk factors, including hypertension, diabetes mellitus, dyslipidemia, and other chronic conditions, such as osteoarthritis, obstructive sleep apnea, and physical deconditioning. Obesity, defined as a body mass index ≥30 kg/m(2), is associated with increased morbidity and mortality, particularly in severely obese patients with a body mass index ≥35 kg/m(2). Physical activity, healthy eating and behavioral modification are three pivotal approaches to treating obesity. Some individuals may benefit from pharmacologic agents to achieve meaningful weight loss. Unfortunately, there are few such agents at present with proven efficacy and safety profiles. In this review, we discuss the obesity epidemic and its detrimental effects on the CV system, and focus on exercise training and on established pharmacologic agents as well as those on the horizon. We conclude by summarizing the surgical therapeutic options available to treat obesity and the evidence supporting the CV benefits of surgery, and discuss the potential adverse effects of both pharmacologic and surgical options.

Recent advances in cardiac rehabilitation

PURPOSE OF REVIEW

Cardiac rehabilitation has been established as an effective treatment for patients with ischemic heart disease for many years. Despite this, utilization remains low. The purpose of this article is to review the latest research on the benefit, utilization, and implementation of cardiac rehabilitation.

RECENT FINDINGS

Recent research is supportive of the beneficial effects of cardiac rehabilitation in patients with heart failure as well as in older patients. Unfortunately, cardiac rehabilitation continues to be considerably underutilized with poor referral and enrollment rates. Implementing quality performance measures, automated referral systems, and the option of home-based cardiac rehabilitation for some patients may all help to increase participation. In addition, innovative exercise training regimens may help to enhance the beneficial effects of cardiac rehabilitation.

SUMMARY

Cardiac rehabilitation appears beneficial in an increasing array of cardiovascular diseases. Ongoing efforts to improve its use are essential for optimal disease management.

Systematic review of the effect of diet and exercise lifestyle interventions in the secondary prevention of coronary heart disease

The effectiveness of lifestyle interventions within secondary prevention of coronary heart disease (CHD) remains unclear. This systematic review aimed to determine their effectiveness and included randomized controlled trials of lifestyle interventions, in primary care or community settings, with a minimum follow-up of three months, published since 1990. 21 trials with 10,799 patients were included; the interventions were multifactorial (10), educational (4), psychological (3), dietary (1), organisational (2), and exercise (1). The overall results for modifiable risk factors suggested improvements in dietary and exercise outcomes but no overall effect on smoking outcomes. In trials that examined mortality and morbidity, significant benefits were reported for total mortality (in 4 of 6 trials; overall risk ratio (RR) 0.75 (95% confidence intervals (CI) 0.65, 0.87)), cardiovascular mortality (3 of 8 trials; overall RR 0.63 (95% CI 0.47, 0.84)), and nonfatal cardiac events (5 of 9 trials; overall RR 0.68 (95% CI 0.55, 0.84)). The heterogeneity between trials and generally poor quality of trials make any concrete conclusions difficult. However, the beneficial effects observed in this review are encouraging and should stimulate further research.

High-calorie-expenditure exercise: a new approach to cardiac rehabilitation for overweight coronary patients

BACKGROUND

More than 80% of patients entering cardiac rehabilitation (CR) are overweight, and >50% have metabolic syndrome. Current CR exercise protocols result in little weight loss and minimal changes in cardiac risk factors. We sought to design an exercise protocol that would lead to greater weight loss and risk factor change.

METHODS AND RESULTS

We performed a randomized controlled clinical trial to evaluate the effect of high-calorie-expenditure exercise (3000- to 3500-kcal/wk exercise-related energy expenditure) compared with standard CR exercise (7 to 800 kcal/wk) on weight loss and risk factors in 74 overweight patients with coronary heart disease. Both groups were counseled for weight loss and taking evidence-based preventive medications. High-calorie-expenditure exercise resulted in double the weight loss (8.2+/-4 versus 3.7+/-5 kg; P<0.001) and fat mass loss (5.9+/-4 versus 2.8+/-3 kg; P<0.001) and a greater waist reduction (-7+/-5 versus -5+/-5 cm; P=0.02) than standard CR exercise at 5 months. High-calorie-expenditure exercise reduced insulin resistance, measured with the euglycemic hyperinsulinemic clamp, along with the ratio of total to high-density lipoprotein cholesterol and components of the metabolic syndrome, more than standard CR exercise (each P<0.01). Overall, fat mass loss best predicted improved metabolic risk, and the prevalence of metabolic syndrome decreased from 59% to 31%. Changes in cardiac risk factors included decreased insulin resistance, increased high-density lipoprotein cholesterol, and decreased measures of insulin, triglycerides, blood pressure, plasminogen activator inhibitor-1, and the ratio of total to high-density lipoprotein cholesterol (each P<0.05). Significant weight loss was maintained at 1 year.

CONCLUSIONS

High-calorie-expenditure exercise promotes greater weight loss and more favorable cardiometabolic risk profiles than standard CR for overweight coronary patients.

Older adults' use of postacute and cardiac rehabilitation services after hospitalization for a cardiac event

The purpose of this study was to describe older patients' use of postacute care (PAC) and outpatient cardiac rehabilitation (CR) services after a cardiac event and to describe the differences between older adults who use these services and those who do not. Under a longitudinal descriptive design, data were collected during hospitalization for a cardiac event, 3 and 6 weeks later, and 4 and 6 months later Of the 60 older adults in the sample, 73% used PAC after discharge. Older adults discharged home without PAC services had fewer complications and were less depressed than those who used PAC. Older adults discharged to a skilled nursing facility had poorer physical function both before the cardiac event and during hospitalization. Twenty-five percent participated in outpatient CR. Older adults who went to CR were male, had better physical function, and did not live alone. Understanding the use of PAC and CR services will help with discharge planning and customizing PAC and CR services for older adults to optimize cardiac recovery. The integration of CR principles into PAC may be an opportunity to enhance recovery for older adults, especially because only a small percentage of older adults attend CR.

Older adults' early disability following a cardiac event

Using the disablement model, the authors examined the following questions in adults 70 years of age and older during the 6 weeks following hospitalization for a cardiac event: (a) What are the patterns in physical performance, self-report of functional limitations, and disability, and (b) to what extent does physical performance in the hospital and self-report of functional limitations pre-event predict 6-week disability? Data were collected before discharge and 3 and 6 weeks later on a sample of 60 older adults after a cardiac event. Results show that although the majority of participants improved in their objective physical performance, 70% self-reported no improvement or worsening. Physical performance during hospitalization is a better predictor of disability than a pre-event self-report of functional limitations, even when controlling for depression, gender, and comorbidity. Assessment of objective physical performance prior to discharge will help to identify older adults at risk for progressive disability.

Individualized Preventive Care in Cardiac Rehabilitation

The benefits of individualizing risk factor therapies and exercise protocols in patients participating in early outpatient cardiac rehabilitation are reviewed. Risk factor intervention modules for modifications of lipid abnormalities and obesity are outlined. Specific individualized exercise regimens are described for patients characterized by the presence of obesity, older age, intermittent claudication, and chronic heart failure, which provide favorable outcomes related to risk factor measures and physical functioning. With adoption and application of an individualized approach for cardiac rehabilitation patients, programs are evolving to become secondary prevention centers for patients with established coronary heart disease.

Patients with large myocardial infarction gain a greater improvement in exercise capacity after exercise training than those with small to medium infarction

BACKGROUND

It remains unclear whether patients with large-size myocardial infarction (MI) achieve the same benefit from exercise training as do those with small- to medium-size MI.

HYPOTHESIS

This study was designed to determine the magnitude and mechanisms underlying improvement in exercise capacity in patients with large-size MI after cardiac rehabilitation.

METHODS

In all, 296 patients who participated in a cardiac rehabilitation program after acute MI were divided into two groups according to the peak serum creatine phosphokinase (CPK) level: the group with large infarction (Group 1) (> or = 5000 U/l peak CPK, 64 patients) and the group with less extensive infarction (Group 2) (< 5000 U/I, 232 patients). Exercise capacity was assessed before and after a 3-month cardiac rehabilitation program that included exercise training.

RESULTS

Before exercise training, both the peak work rate (p < 0.05) and peak oxygen uptake (VO2) (p < 0.01) were significantly lower in Group 1 than in Group 2. After exercise training, the changes in peak work rate and peak VO2 were significantly greater in Group 1 than in Group 2 (both p < 0.01). The infarction size measured by the peak CPK level correlated significantly with both the baseline exercise capacity and its improvement after exercise training, although these correlations were insignificant in a multivariate analysis. In the multivariate analysis, the improvement in exercise capacity is determined by age and baseline exercise capacity, which is determined by the duration of inactivity, minute ventilation (VE)/VCO2 slope and left ventricular end-diastolic pressure.

CONCLUSIONS

Compared with patients with small- to medium-size myocardial infarction, patients with large infarction gain a greater improvement in exercise capacity after exercise training due to reversal of physical deconditioning and improvement in congestive heart failure.

Older Adults' Views of Cardiac Rehabilitation Programs: Is it Time to Reinvent?

In spite of the documented benefits of cardiac rehabilitation program (CRP) participation, older adults are not likely to participate. Older adults' expectations of and experiences with CRPs are not known. It is also not known whether women and men differ in their expectations and experiences. This descriptive study used a convenience sample of 40 older adults who had experienced an acute cardiac event to identify patients' views of CRPs. Focus groups revealed that older adults do not have an accurate understanding of what to expect in CRPs, and that older adults' experiences in CRPs were generally positive. Older adults suggested CRPs could be improved by including more socialization opportunities, offering varied forms of exercise, enhancing teaching about stress management, and adapting teaching strategies. In this study, "strength of physician referral" was identified as the main reason for participating or not participating in a CRP. Older men feared physical pain with exercise and older women expressed a need for emotional support. A major finding in this study was the report of adverse events (i.e., exhaustion, collapse) during exercise experienced by individuals who did not go to a CRP. Because the majority of adults participating in CRPs are older, transforming CRPs to meet the needs of these older adults is important. Future research on the effectiveness of alternative CRP models will provide evidence to ensure the delivery of quality, cost-effective care.

Effects of a CHANGE intervention to increase exercise maintenance following cardiac events

BACKGROUND

Despite participation in a cardiac rehabilitation program, there is a downward trajectory of exercise participation during the year following a cardiac event.

PURPOSE

The purpose of this study was to test the effectiveness of CHANGE (Change Habits by Applying New Goals and Experiences), a lifestyle modification program designed to increase exercise maintenance in the year following a cardiac rehabilitation program. The CHANGE intervention consists of 5 small-group cognitive-behavioral change counseling sessions in which participants are taught self-efficacy enhancement, problem-solving skills, and relapse prevention strategies to address exercise maintenance problems.

METHOD

Participants (N = 250) were randomly assigned to the CHANGE intervention (supplemental to usual care) or a usual-care-only group. Exercise was measured using portable wristwatch heart rate monitors worn during exercise for 1 year. Cox proportional hazards regression was used to determine differences in exercise over the study year between the study groups.

RESULTS

Participants in the usual-care group were 76% more likely than those in the CHANGE group to stop exercising during the year following a cardiac rehabilitation program (hazard ratio = 1.76, 95% confidence interval = 1.08-2.86, p = .02) when adjusting for the significant covariates race, gender, comorbidity, muscle and joint pain, and baseline motivation. Most participants, however, had less than recommended levels of exercise amount and intensity.

CONCLUSIONS

Counseling interventions that use contemporary behavior change strategies, such as the CHANGE intervention, can reduce the number of individuals who do not exercise following cardiac events.

Economic evaluation of a randomised trial of early return to normal activities versus cardiac rehabilitation after acute myocardial infarction

BACKGROUND

Although there have been a number of economic evaluations of cardiac rehabilitation after acute myocardial infarction (AMI), none has considered only low-risk patients or control groups with no rehabilitation at all.

METHODS

An economic evaluation was included in a randomised controlled trial of patients following uncomplicated AMI. Eligible patients were randomised to return to normal activities after 6 weeks of standard rehabilitation (REHAB, n = 70) or to early return to normal activities 2 weeks after AMI with no formal rehabilitation (ERNA, n = 72). Outcomes were assessed weekly for 6 weeks, then 3, 6 and 12 months post-AMI. Outcomes included four quality of life (QOL) measures (physical abilities, distress, usual/social activities, self-care) and four measures of return to normal activities (paid and unpaid return to any work and to pre-AMI level of work). Statistical analysis included repeated-measures regression (QOL outcomes) and survival analysis (work outcomes).

RESULTS

There were no statistically significant differences between the two groups in any of the outcomes measured or in the use of other health services. The net cost that could be saved by the health service by targeting rehabilitation to high-risk patients was approximately $300 (Australian, 1999) per low-risk patient.

CONCLUSIONS

Early return to normal activities without formal rehabilitation is cost-effective for low-risk patients.

Toward a New Payment System for Inpatient Rehabilitation

BACKGROUND

The major fault with existing reimbursement systems lies in their failure to discriminate for the effectiveness of stay, both when paying per day and when paying per episode of treatment.

OBJECTIVES

We sought to define an average length of effective stay and recovery trends by impairment category, to design a prospective payment system that takes into account costs and expected recovery trends, and to compare the calculated reimbursement with the predicted costs estimated in a previous study (Saitto C, Marino C, Fusco D, et al. A new prospective payment system for inpatient rehabilitation. Part I: predicting resource consumption. Med Care. 2005;43:844-855).

RESEARCH DESIGN

We considered all rehabilitation admissions from 5 Italian inpatient facilities during a 12-month period for which total cost of care had already been estimated and daily cost predicted through regression model. We ascertained recovery trends by impairment category through repeated MDS-PAC schedules and factorial analysis of functional status. We defined effective stay and daily resource consumption by impairment category and used these parameters to calculate reimbursement for the admission. We compared our reimbursement with predicted cost through regression analysis and evaluated the goodness of fit through residual analysis.

RESULTS

We calculated reimbursement for 2079 admissions. The r(2) values for the reimbursement to cost correlation ranged from 0.54 in the whole population to 0.56 for "multiple trauma" to 0.85 for "other medical disorders." The best fit was found in the central quintiles of the cost and severity distributions.

CONCLUSION

For each impairment category, we determined the number of days of effective hospital stay and the trends of functional gain. We demonstrated, at least within the Italian health care system, the feasibility of a reimbursement system that matches costs with functional recovery. By linking reimbursement to effective stay adjusted for trends of functional gain, we suggest it is possible to avoid both needless cuts and extensions of hospital admissions.

A short course of cardiac rehabilitation program is highly cost effective in improving long-term quality of life in patients with recent myocardial infarction or percutaneous coronary intervention

OBJECTIVE

To evaluate the long-term effect of a cardiac rehabilitation and prevention program (CRPP) on quality of life (QOL) and its cost effectiveness.

DESIGN

Prospective, randomized controlled trial.

SETTING

University-affiliated outpatient cardiac rehabilitation and prevention center.

PARTICIPANTS

A total of 269 patients (76% men; mean age, 64+/-11 y) with recent acute myocardial infarction (AMI; n=193) or after elective percutaneous coronary intervention (PCI; n=76) were randomized in a ratio of 2 to 1.

INTERVENTION

Patients received either CRPP (an 8-wk exercise and education class in phase 2) or conventional therapy without exercise program (control group). They were followed until they had completed all 4 phases of the program (ie, 2 y).

MAIN OUTCOME MEASURES

QOL assessments, by using the Medical Outcomes Study 36-Item Short-Form Health Survey (SF-36) and Symptoms Questionnaire, were performed at the end of each phase. Direct health care cost was calculated, whereas cost utility was estimated as money spent (in US dollars) per quality-adjusted life-year (QALY) gained.

RESULTS

In the CRPP group, 6 of the 8 SF-36 dimensions improved significantly by phase 2 and were maintained throughout the study period. Patients were less anxious and depressed, and felt more relaxed and contented. In the control group, none of the SF-36 dimensions were improved by phase 2, and bodily pain was increased. In phase 4, only 4 dimensions were improved. Symptoms were unchanged except for increased hostility score. There was a significant gain in net time trade-off in the CRPP group after phase 2. The direct health care expenses in the CRPP and control groups were 15,292 dollars and 15,707 dollars per patient, respectively. Therefore, the cost utility calculated was 640 dollars saved per QALY gained. Savings attributable to CRPP were primarily explained by the lower rate (13% vs 26% of patients, chi2 test=3.9, P <.05) and cost of subsequent PCI (P =.01).

CONCLUSIONS

In an era of managing patients with coronary heart disease, a short-course CRPP was highly cost effective in providing better QOL to patients with recent AMI or after elective PCI. In addition, the improvement of QOL was quick and sustained for at least 2 years after CRPP.

Effects of exercise and cardiac rehabilitation on cardiovascular outcomes

Cardiac rehabilitation was originally conceived to counteract the deconditioning and comorbidities associated with prolonged bed rest after a myocardial infarction. Contemporary cardiac rehabilitation has taken a more comprehensive approach, with a broader range of participating patients. Relevant cardiovascular outcomes of cardiac rehabilitation can be classified as primary clinical outcomes, intermediate clinical outcomes, and quality-of-life outcomes. In this article, the effects of exercise training alone and, more importantly, the value of comprehensive cardiac rehabilitation are reviewed from the point of view of individual cardiovascular outcomes.

Impact of a home communication intervention for coronary artery bypass graft patients with ischemic heart failure on self-efficacy, coronary disease risk factor modification, and functioning

OBJECTIVE

The purpose of this study is to determine the impact of a home communication intervention (HCI) for ischemic heart failure Coronary Artery Bypass Graft (CABG) patients >/= 65 years of age on self-efficacy, coronary artery disease risk factor modification and functioning posthospitalization.

DESIGN

A randomized clinical trial with repeated measures was used.

SAMPLE

A subsample of ischemic heart failure CABG surgery patients (n = 35) was drawn from the parent study of 180 CABG patients.

RESULTS

HCI participants (n = 18) had significantly higher adjusted mean self-efficacy scores [F(1, 29) = 6.40, P <.05] and adjusted mean levels of functioning (physical, general health, mental, and vitality functioning) compared with the routine care group (n = 17), using repeated measures analysis of covariance with baseline scores as covariates. There were also significant effects of time on bodily pain and role emotional functioning. Significantly higher exercise adherence (t = 3.09, P <.01) and lower reported stress (t = 3.77, P <.01) at 3 months after surgery was reported by HCI subjects.

CONCLUSIONS

Data from this pilot study can be used to strengthen the HCI intervention with more tailored strategies for vulnerable subgroups of CABG patients.

Predictors of women's exercise maintenance after cardiac rehabilitation

PURPOSE

Less than 50% of persons who participate in cardiac rehabilitation (CR) programs maintain an exercise regimen for as long as 6 months after completion. This study was conducted to identify factors that predict women's exercise following completion of a CR program.

METHODS

In this prospective, descriptive study, a convenience sample of 60 women were recruited at completion of a phase II CR program. Exercise was measured using a heart rate wristwatch monitor over 3 months. Predictor variables collected at the time of the subjects' enrollment were age, body mass index, cardiac functional status, comorbidity, muscle or joint pain, motivation, mood state, social support, self-efficacy, perceived benefits or barriers, and prior exercise.

RESULTS

Of women, 25% did not exercise at all following completion of a CR program and only 48% of the subjects were exercising at 3 months. Different predictors were found of the various dimensions of exercise maintenance. Predictors of exercise frequency were comorbidity and instrumental social support. Instrumental social support was the only predictor of exercise persistence. Comorbidity was the only predictor of exercise intensity. The only predictor of the total amount of exercise was benefits or barriers.

CONCLUSIONS

Interventions aimed at increasing women's exercise should focus on increasing their problem-solving abilities to reduce barriers to exercise and increase social support by family and friends. Because comorbidity was a significant predictor of exercise, women should be encouraged to use exercise techniques that reduce impact on muscles and joints (eg, swimming) or exercising for short periods several times a day.

Barriers to participation in and adherence to cardiac rehabilitation programs: a critical literature review

Despite the documented evidence of the benefits of cardiac rehabilitation (CR) in enhancing recovery and reducing mortality following a myocardial infarction, only about one third of patients participate in such programs. Adherence to these programs is an even bigger problem, with only about one third maintaining attendance in these programs after 6 months. This review summarizes research that has investigated barriers to participation and adherence to CR programs. Some consistent factors found to be associated with participation in CR programs include lack of referral by physicians, associated illness, specific cardiac diagnoses, reimbursement, self-efficacy, perceived benefits of CR, distance and transportation, self-concept, self-motivation, family composition, social support, self-esteem, and occupation. Factors associated with non-adherence include being older, female gender, having fewer years of formal education, perceiving the benefits of CR, having angina, and being less physically active during leisure time. However, many of the studies have methodologic flaws, with very few controlled, randomized studies, making the findings tentative. Problems in objectively measuring adherence to unstructured, non-hospital-based programs, which are an increasingly popular alternative to traditional programs, are discussed. Suggestions for reducing barriers to participation and adherence to CR programs, as well as for future research aimed at clearly identifying these barriers, are discussed.

Using the CHANGE intervention to enhance long-term exercise

Although Phase II Cardiac Rehabilitation (CR) is effective at reconditioning people following cardiac events, it has had limited effectiveness in assisting participants to maintain the long-term exercise necessary for secondary prevention of cardiovascular events. This article describes a promising new intervention, CHANGE (Change Habits by Applying New Goals and Experiences), designed to enhance individuals' problem solving, self-efficacy, and relapse prevention skills regarding long-term exercise. Five small-group, nurse-led sessions are used to provide the intervention during the last three weeks of the formal CR program, and at one and two months following CR. Pilot data indicate that the CHANGE intervention has a positive effect on number and length of exercise sessions, number of minutes exercised, and time spent in target heart rate (HR) zone as measured by wristwatch HR monitors for three months following CR. The CHANGE intervention was found to be acceptable to clients and feasible to clinicians.

[Is it necessary to rehabilitate coronary artery disease patients based on ventilatory threshold?]

PURPOSE

To compare the efficiency of two programs of exercise-based rehabilitation that are different for heart rate (HR) training in patients with coronary artery disease: heart rate (HR) according to Karvonen formula (HR training =70% (max HR -rest HR) +rest HR) or HR recorded at the gas exchange ventilatory threshold (VT). TYPE: Controlled randomised clinical trial.

SETTING

Cardiovascular rehabilitation unit.

METHOD

Twenty-four male patients (54 +/-9.5 years old) with coronary artery disease were allocated at random to one of the two groups: KHR group (n =13) according to Karvonen formula (n =11), and VTHR group according to VT determined by exertion test (n =13). The exercised-based program was similar for all the patients, differing only in HR training (five daily sessions a week for four weeks). Assessment tests were performed at D1 and D28 and included: - an exercise test with measure of HR and double product (HR x blood pressure) at rest, submaximal and maximal intensity, with measure of oxygen consumption and gas exchanges at rest and at maximum exercise; - specific functional tests based on daily life activities; - dyspnea assessment at maximal intensity; - quality of life measurement by SF36. It was taken notice of the drugs taken by the patients, specially betablockers.

RESULTS

At inclusion, the two groups were not different for parametric (age, body mass index) and non parametric values (medical or surgical treatment, comorbidity). Even though HR training was significantly different (p <10(-6)), at the end of the program there was a significant increase of power and oxygen consumption at VT (+42.6%, p <10(-6); +18.6%, p <10(-5)) and at maximal intensity (+18.7 %, p <10(-6); 14.2 %, p <10(-5)), but differences between the two groups were not significant; double product was significantly lower at rest (-13.9 %, p <10(-5)) and at submaximal exertion (-10.6 %, p < 10(-3)). Yet, the two groups differed in HR, and HR increased in VTHR group and decreased in KHR, the difference being significant at VT (p =0.05), at submaximal (p =0.037) and maximal exercise (p = 0.05). Dyspnea at maximal intensity was higher in VTHR but SF36 values were not different.

DISCUSSION AND CONCLUSION

These results confirm the efficiency of cardiac training program according to Karvonen formula as to ventilatory threshold. However, there is a negative chronotropic effect of cardiac training according to Karvonen formula with a higher intensity, which corresponds to a less cardiac work for a same activity.

Predictors of physical activity in older adults in an independent living retirement community

This study was undertaken to examine potential predictors of physical activity in older adults in an independent living retirement community. Participants received a self-developed questionnaire that included questions regarding age, gender, educational attainment, physical activity habits, and physicians' physical activity counseling habits. One hundred nine of 150 questionnaires (72.7%) were completed and returned. Multivariate regression analyses revealed that younger age (p=0.013), higher educational attainment (p=0.003), positive attitude toward physical activity (p=0.030), and receiving advice from a physician to be physically active (p=0.001) were all positive predictors of increased physical activity. The results demonstrate that younger age, higher educational attainment, a positive attitude toward physical activity, and receiving advice from a physician to be physically active result in increased physical activity levels of older adults in an independent living retirement community.

HeartCare: an Internet-based information and support system for patient home recovery after coronary artery bypass graft (CABG) surgery

HeartCare is an Internet-based information and support service for patients recovering at home from coronary artery bypass graft (CABG) surgery. The system is designed to meet the nursing challenges in health information to support needs of CABG patients. HeartCare (a) provides information and support, tailored to patients' individual and changing recovery needs during CABG recovery, (b) makes recovery information more accessible for timely use by patients, and (c) extends the scope of nursing services to CABG patients from hospital through home. An ongoing randomized controlled study is underway to evaluate the clinical outcomes of patients' use of the HeartCare system and to examine its acceptance as a usable resource for postCABG patients who have limited previous computer experience.

Return to work after myocardial infarction/coronary artery bypass grafting: patients' and physicians' initial viewpoints and outcome 12 months later

Nonmedical factors play an important role in determining whether patients resume their work after myocardial infarction or CABG. The main questions dealt with in this study are: What is the respective basis of physicians' and patients' judgements as far as vocational disabilities are concerned, and what are the decisive factors that facilitate a prediction as to who will return to work and who will not? 132 male patients participating in a cardiac rehabilitation program served as subjects. The age group was limited to patients between 40 and 59 yr of age. The work situation 12 months following rehabilitation is known for 119 subjects; 74 had resumed their occupations. Results of regression analyses show that patients' and physicians' views on disabilities and re-employment are based on different factors. The physicians derive their estimates mainly from medical variables (cardiac status and comorbidity), whereas the patients' views are based on the overall health status, their former job status, job satisfaction, and negative incentives for the return to work. Three variables were found that allow a prediction to be made as to re-employment in 85% of all cases: (1) age, (2) patients' feelings about the extent to which they are disabled by their cardiac problem, and (3) the physicians' views on the extent to which the patient is vocationally disabled by his overall medical situation. Medical variables (e.g. cardiac status) had little relevance to re-employment. The results are discussed with regard to the consequences for cardiac rehabilitation.