Donna Waechter

Cognitive impairment is independently associated with reduced instrumental activities of daily living in persons with heart failure

Background:Heart failure (HF) is a disabling disease that often affects instrumental activities of daily living (instrumental ADLs). Despite high rates of disability in this population, little is known about the effects of cognitive impairment on instrumental ADLs in this population. Objective:The current study examined whether cognitive functioning predicts instrumental ADL performance in persons with HF. Methods:Persons with HF (N = 122; 68.49 [SD, 9.43] years; 35.2% female) completed neuropsychological testing, fitness assessment, and self-reported instrumental and basic ADL function as part of a larger protocol. Neuropsychological tests included the Mini-Mental State Examination and Trail Making Tests A and B. The 2-minute step test estimated fitness. Instrumental and basic ADL function was based on self-report on the Lawton-Brody Activities of Daily Living Scale. Hierarchical regression analyses were used to determine the independent contribution of cognitive function to ADLs in HF. Results:Heart failure patients reported high rates of impairments in instrumental ADLs, but indicated requiring little or no assistance with basic ADLs. Cognitive function showed incremental predictive validity for driving (R2 change = .07, P = .03) and medication management (R2 change = .14, P < .001). In each case, poorer neuropsychological test performance was associated with poorer instrumental ADL function. Conclusion:In persons with HF, cognitive performance is an independent predictor of independence in driving and medication management. Strategies to maintain or improve cognitive functioning in HF may help patients remain functionally independent in their daily living.

The METER: A Brief, Self-Administered Measure of Health Literacy

BackgroundGiven rapidly accumulating evidence that health literacy is correlated with important health-related measures, assessing patients’ health literacy level is of increasing concern for researchers and practitioners. Practical limitations for use of existing health literacy measures include length of time and practitioner involvement in administration.ObjectiveTo develop and validate a brief, self-administered measure of health literacy, the Medical Term Recognition Test (METER).Participants155 participants were recruited from an outpatient cardiology program at an urban hospital.MeasuresPatients completed measures of health literacy (METER and REALM), neuropsychological function, psychosocial health, and self-report questionnaires about health behaviors. Indicators of cardiovascular health were also recorded from patients’ medical charts.Key resultsThe measure took 2 min to complete. The internal consistency of the METER was 0.93, and it correlated highly with REALM (r = 0.74). Regarding sensitivity and specificity for identifying individuals below REALM’s cutoff for functional literacy, METER resulted in 75% correct identifications and 8% false positives. METER and REALM were both associated with various health-related measures (including significant correlations with measures of neuropsychological function and cardiovascular health).ConclusionsThese initial findings show that the METER is a quick and practical measure of health literacy for use in clinical settings.

Improvements in Cognitive Function Following Cardiac Rehabilitation for Older Adults With Cardiovascular Disease

ABSTRACT Cognitive impairment is common in persons with cardiovascular disease (CVD). Cardiac rehabilitation (CR) improves many aspects of CVD linked to cognitive impairment. The current study explored whether CR may improve cognitive function. Potential mechanisms for cognitive changes were also examined through exploratory analyses, including changes in cardiovascular fitness and cerebral blood flow. Fifty-one older adults with CVD underwent neuropsychological assessment at baseline and discharge from a 12-week CR program. Cardiovascular fitness (i.e., metabolic equivalents [METs]) was estimated from a symptom-limited volitional stress test. Transcranial doppler quantified mean cerebral blood flow velocity and pulsatility indexes for the middle cerebral artery and anterior cerebral artery (ACA). Repeated measures ANOVA showed improvements in global cognition, attention-executive-psychomotor function, and memory. Exploratory analyses revealed improvement in METs and changes in ACA flow velocity, but only improvement in METs was related to improved verbal recall. CVD patients exhibited improvements in multiple cognitive domains following a 12-week CR program, suggesting that cognitive impairment is modifiable in this population. Although other studies are needed to elucidate underlying mechanisms, exploratory analyses suggest that cognitive improvements may be better explained by physiological processes other than improved cardiovascular fitness and cerebral blood flow.

Depression is associated with reduced physical activity in persons with heart failure.

OBJECTIVE Reduced physical activity is common in persons with heart failure (HF). However, studies of correlates and modifiers of physical activity in this population rarely employ objective measures. Motivational and mood related factors that may exacerbate inactivity in HF patients are also rarely investigated. In this study, we examined the relationship between physical activity as assessed by accelerometry, and depression in older adults with HF. METHODS At baseline, older adults with HF (N = 96; 69.81 ± 8.79) wore an accelerometer for seven days, and completed a brief fitness assessment, neuropsychological testing, and psychosocial measures including the Beck Depression Inventory-II (BDI-II). Medical and demographic history was obtained through record review and self-report. RESULTS Accelerometer measures showed that HF patients averaged 587 minutes of sedentary time and just 0.31 minutes of vigorous activity per day. Lower daily step count was associated with poorer quality of life and reduced cognitive function. A multiple linear regression adjusting for important demographic and medical variables found that greater number of depressive symptoms on the BDI-II independently predicted lower physical activity levels. CONCLUSION Consistent with past work, the current study found that low physical activity is common in older adults with HF. Depression is an independent predictor of physical activity in older adults with HF and reduced physical activity is associated with numerous adverse psychosocial outcomes. Future studies need to determine whether treatment of depression can boost physical activity and thus improve health outcomes in this population.

The 2-minute step test is independently associated with cognitive function in older adults with heart failure

Background and aims: Cognitive impairment is common in persons with heart failure (HF), and measures like the 6-minute walk test (6MWT) are known to correspond to level of impairment. The 2-minute step test (2MST) has been suggested as a more practical alternative to the 6MWT, though no study has examined whether it is associated with cognitive impairment in persons with HF. This study examined whether the 2MST is associated with cognitive function in older adults with HF. Methods: Older adults with HF (n=145; 68.97±9.31 yrs) completed the 2MST and a neuropsychological test battery that assessed function in multiple cognitive domains. Results: Consistent with past work, HF patients exhibited high rates of cognitive impairment. Hierarchical regression analyses adjusting for demographic and medical characteristics found that the 2MST accounted for unique variance in global cognitive function (ΔR2=0.09, p<0.001), executive function (ΔR2=0.03, p<0.05), and language (ΔR2=0.10, p<0.001). A trend emerged for attention (ΔR2=0.02, p=0.09). Follow-up tests indicated that better 2MST performance was significantly correlated with better global cognitive function, attention, executive, and language test performance. Conclusion: The current results indicate that the 2MST is associated with cognitive function in older adults with HF. Further work is needed to clarify underlying mechanisms for this association and the value of implementing the 2MST during routine visits.

Reduced Executive Functioning Is Associated With Poorer Outcome in Cardiac Rehabilitation

Patients with cardiovascular disease and cognitive impairment show reduced adherence to treatment. No study has examined whether cognitive impairment may also predict reduced benefit from cardiac rehabilitation (CR). It appears that cognitively impaired patients may exhibit poorer adherence to CR and limited gains in cardiovascular fitness and/or quality of life (QOL). Forty-four older adults who enrolled in a CR program and completed measures at enrollment and discharge were included. Cognitive functioning was assessed using the Trail Making Test B. Estimated metabolic equivalents (METs) were derived from a treadmill stress test to provide a measure of cardiovascular fitness. QOL was measured with the Short Form-36 (SF-36) physical and mental component scales (PCS and MCS, respectively). Repeated measures analysis of variance showed improvements in METs [METs; F(1,36)=77.6, P<.001] and physical [SF-36 PCS; F(1,36)=14.14, P=.001)] and mental QOL [SF-36 MCS; F(1,36)=11.55, P=.002)]. Partial correlations indicated that poorer Trail Making Test B performance was associated with lower METs at discharge (r=-0.30, P<.05), but not PCS or MCS. Mini-Mental State Examination scores were not related to outcome variables. Current findings suggest that patients with poorer executive functioning derive reduced benefit from CR. CR programs may consider screening patients at baseline for low cognitive functioning to help identify those patients at greatest risk for poor outcome.

Cognitive reserve moderates the association between heart failure and cognitive impairment

Background: Cognitive impairment in persons with heart failure is common. Theories of cognitive reserve suggest that premorbid factors, such as intellectual ability, may provide a buffer against cognitive impairment due to neuropathological insult. No study has examined the influence of cognitive reserve on cognitive functioning in older adults with heart failure. Aim: This study examined whether cognitive reserve moderates the relationship between heart failure severity and cognitive function. Methods: A total of 157 persons with heart failure (69.26 ± 9.26 years; 39% female) completed neuropsychological testing and a brief fitness assessment. Cognitive reserve was operationalized using estimated premorbid intellect on the American National Adult Reading Test (AMNART). Results: A moderation analysis was performed using hierarchical regression models for each cognitive domain. An interaction term between the AMNART and 2-Minute Step Test was created and entered into the final block of the model, with demographic, psychosocial, and heart failure severity entered in the previous blocks. The interaction term was significant for attention, t(155) = –2.54, p = .012, executive function, t(155) = –3.30, p = .001, and language, t(155) = –2.83, p = .005, domains. Conclusion: The current findings suggest that cognitive reserve moderates the association between heart failure severity and cognitive function in multiple cognitive domains. Further work is needed to clarify the mechanisms by which cognitive reserve attenuates cognitive impairment in this population.

Reduced Heart Rate Recovery Is Associated with Poorer Cognitive Function in Older Adults with Cardiovascular Disease

Cardiovascular disease (CVD) in older adults has been associated with varying degrees of cognitive dysfunction. Several mechanisms may explain this association, including impaired cardiovascular reactivity to autonomic nervous system (ANS) signaling. Reduced heart rate recovery following a stress test may be considered an indication of impaired ANS function (i.e., reduced parasympathetic activity). Participants were 47 older adults (53–83 years) who underwent a treadmill stress test and were administered a comprehensive neuropsychological battery upon entry to phase II cardiac rehabilitation. Reduced parasympathetic activity was associated with impaired cognitive performance on a measure of global cognitive function and on tasks of speeded executive function and confrontation naming. These relationships suggest that changes in autonomic function may be mechanistically related to the impaired cognitive function prevalent in CVD patients.

Depression and Heart Rate Variability in Cardiac Rehabilitation Patients: Exploring the Roles of Physical Activity and Fitness

Cardiac patients with depression have shown altered autonomic nervous system functioning, expressed as reduced heart rate variability. This may be associated with poorer physical fitness and less physical activity among depressed patients. These relationships were explored among patients enrolled in outpatient cardiac rehabilitation. 22 depressed and 22 nondepressed patients, matched for sex and age, were assessed at enrollment. The Beck Depression Inventory and structured interviews were used to measure depression. Patients completed ambulatory monitoring of ECG (i.e., Holter) and physical activity, as well as a treadmill stress test. Depression was associated with several measures of heart rate variability. Activity and fitness were lower among the depressed patients. Although exploratory, accounting for activity and fitness attenuated the relationship between depression and heart rate variability. This suggests that altered fitness and activity may help explain altered autonomic tone that characterizes patients with cardiovascular diseases who are psychologically depressed.

Health literacy predicts cardiac knowledge gains in cardiac rehabilitation participants

Objective: Health literacy is increasingly recognised as a potentially important patient characteristic related to patient education efforts. We evaluated whether health literacy would predict gains in knowledge after completion of patient education in cardiac rehabilitation. Method: This was a re-post observational analysis study design based on Summa Health System’s Phase-II cardiac rehabilitation programme in Akron, Ohio, USA. The Medical Term Recognition Test, the Short Test of Functional Health Literacy in Adults, and the Newest Vital Sign were administered to 191 patients enrolled in cardiac rehabilitation between May 2010–April 2011. The Cardiac Knowledge Assessment Tool is routinely administered at the beginning and prior to discharge from cardiac rehabilitation. Consent was obtained in order to access patients’ cardiac rehabilitation medical chart for information such as age and education level. Results: Participants were 72% men with a mean of 66.4 years of age, and with an average level of education of 13.7 years. Health literacy was strongly related to cardiac knowledge at both the beginning and end of cardiac rehabilitation (r=0.46, p<0.001; r=0.41, p<0.001). Controlling for cardiac knowledge at the beginning of cardiac rehabilitation, health literacy predicted gains in cardiac knowledge at the end of cardiac rehabilitation (p<0.01). Conclusion: Health literacy can be used to predict gains in knowledge from patient education programming in cardiac rehabilitation. Health literacy screening may help to identify those who may struggle with patient-education portions of cardiac rehabilitation or who may need additional education to reach a desired knowledge level.