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(Stroke. 1999;30:1478-1485.)
© 1999 American Heart Association, Inc.
Comments, Opinions, and Reviews |
From the Department of Gerontology; University of South Florida, Tampa, Fla.
Correspondence to Beth Han, Department of Gerontology, University of South Florida, 4202 East Fowler Avenue, SOC 107, Tampa, FL 33620. E-mail hhan{at}luna.cas.usf.edu
| Abstract |
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Summary of ReviewA total of 20 published stroke caregiving research articles were included in this review. Across studies, the effects of stroke caregiving on caregivers' well-being and the significant predictors of caregivers' depression were analyzed. Current evidence suggests that stroke caregivers have elevated levels of depression at both the acute stroke phase and the chronic stroke phase. However, major gaps are apparent in this literature, with few studies addressing such areas as caregiver physical health, ethnicity, and caregiver interventions.
ConclusionsGiven the increasing prevalence of stroke as well as the increasing pressures on families to provide care, more research is needed to guide policy and practice in this understudied topic.
Key Words: caregivers depression stress stroke outcome
| Introduction |
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The support of family caregivers for their relatives with stroke have an important impact on whether patients can remain outside of rehabilitation care.3 6 There is evidence that depression in stroke caregivers worsens the patients' depressive symptoms7 and predicts poor responses of patients to rehabilitation.7 8 9 Moreover, the continuing shift from institutional care to community care makes the impact of stroke caregiving more profound than ever.
Despite the high prevalence of stroke and the potentially high burden of family caregiving for the stroke survivors, few studies have systematically addressed the consequences of stroke on family members and other informal caregivers. For example, 2 recently published articles on Alzheimer's disease (AD) caregiving identified more than 60 articles published between 1986 and 199510 11 ; however, there were only about 20 published empirical articles related to stroke caregiving between 1986 and 1998.
Given the high and increasing prevalence of stroke, the high risk of developing dementia after stroke onset, the large number of family caregivers coping with stroke, and the evidence that caregivers' adjustments have important implications for patients' quality of life, a current review of the state of knowledge about stroke caregiving is needed. Thus, the purpose of this article is to provide a review and analysis of published empirical studies that have examined the outcomes of caregiving for stroke caregivers. Specifically, our goals are to (1) evaluate the effects of stroke caregiving on caregivers' well-being, (2) outline deficiencies and methodological limitations of current research, and (3) outline policy and practice implications of current studies.
| Methods of Search Strategy |
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The main characteristics of each study, such as sample size, time from
stroke, characteristics of caregivers, major domains examined, and key
results are presented in Table 1
. Each study is presented
according to the order of the publication dates.
|
| Effects of Stroke Caregiving on Caregivers' Well-Being |
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| Prevalence of Caregiver Depression |
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These findings were generally consistent despite the specific instruments used, and the proportion of depressed caregivers was much higher than comparable noncaregiver populations. For instance, only 12% of a noncaregiving control group were depressed,7 as measured by the HDR; only 16.5% of a comparable noncaregiver population were depressed,10 as measured by the CES-D. Moreover, 1 study20 demonstrated that stroke caregivers were statistically more depressed than the control group by comparing the group mean scores measured by the Zung Self-Rating Depression Scale. However, the proportions of depression among caregivers and the control group were not reported in the study.20
In summary, the literature consistently documented high rates of depression in stroke caregivers, which were higher than both available norms and comparison of control groups. However, most stroke caregiving studies have the common characteristics of small sample sizes and opportunistic samples with self-selection bias. Thus, it was possible that biased samples of these studies were more likely to include the more depressed caregivers. No research was identified that has randomly drawn a sample from a stroke caregiver population, which would provide better estimates of the prevalence of depression in stroke caregivers.
| Predictors of Caregiver Depression |
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|
Caregiver Demographics
Several studies examined the association between caregiving
outcomes and demographic characteristics of stroke caregivers,
including the caregiver's age, income, caregiving duration, and
spousal or other relationship with the patient. Three studies found the
age of the caregiver was not related to the caregiver's
depression.6 12 21 However, the mean time intervals
between data collection and stroke onset were unknown in the first 2
studies.6 21 The third study12 found that the
time interval was critical for the relationship, because older
caregivers were less likely to have depression at 6 to 9 months after
stroke but not at 3 to 10 weeks after stroke.
Two studies did not find a relationship between caregivers' income and caregivers' depression.12 21 The mean time interval between data collection and stroke onset was unknown for the second study,21 while the mean time interval was 3 to 10 weeks for the first study. However, the first study12 found that caregivers who had higher income were less likely to be depressed at 6 to 9 months after stroke.
Two studies did not find a relationship between longer duration of care and caregiver depression.6 21 Two studies found that spousal caregivers were more likely to be depressed during the acute care phase.12 22 However, during the chronic care phase, these 2 studies found that being a spousal caregiver was not a significant predictor for caregiver depression.12 22
Caregiver Psychosocial Factors
At the acute stroke phase, 2 studies found that caregivers'
concern for future care was the most important predictor of
caregivers' depression.12 16 However, after the acute
stroke phase, 1 study12 found that caregivers' concern
for future care was no longer a significant predictor of caregivers'
depression at the chronic phase.
Two studies found that caregivers with fewer social contacts were more likely to be depressed.7 22 Moreover, caregivers with fewer social network members were more likely to be depressed during either the acute phase or the chronic phase.22
Caregiver Physical Health
Four of 20 articles used a self-rated global health item to
evaluate caregiver current health on a scale from excellent to poor.
None of these 4 studies6 12 14 22 found a significant
relationship between caregivers' self- rated health and their
depression. However, 3 studies using the measures of physical
symptoms7 12 22 found that caregivers with more physical
symptoms were more likely to be depressed.
Stroke Patient Symptoms
In 6 studies, the physical disability of stroke patients, measured
by the Barthel Index (BI),23 was not related to
caregivers' depression1 3 6 12 16 24 at the chronic
stroke phase. However, 2 studies reported that patients' physical
disability measured by the BI was positively related to caregivers'
depression at the acute phase.12 16
Depression is considered the most common poststroke psychiatric condition of stroke patients.25 Depending on the diagnostic criteria and the duration of stroke, the prevalence of depression of stroke patients ranges from 23% to 63%.25 26 Three studies6 7 16 found that depression of stroke patients was positively associated with the caregivers' depression; the third study16 found this positive relationship at the acute stroke phase, but the first 2 studies6 7 did not specify the time interval between data collection and stroke onset. One study27 did not find a relationship between stroke patients' depression and caregivers' depression at the chronic stroke phase. Moreover, 1 study found that the severity of the patients' depression was positively associated with the severity of the caregivers' depression at 3 months after stroke.1
Objective measures of patient cognitive function were not related to caregiver depression at the acute16 or the chronic stroke phase.3 16 However, 1 study28 indicated that caregivers with greater perception of patients' "cognitive hassles" had higher depression at a mean interval of 14.7 months after stroke. Furthermore, all 3 studies reported that the abnormal or disruptive behavior of stroke patients was positively related to caregivers' depression.3 6 28
| Deficiencies and Methodological Limitations of Current Research |
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| Methodological Concerns |
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Furthermore, the eligibility criteria for caregivers were often not clearly defined. Only 6 of the 20 studies included caregivers for first-time stroke patients. Most stroke caregiving studies controlled neither the caregivers' previous caregiving history nor the stroke patients' previous history of psychiatric morbidity. Stroke patients who had previous dementia histories were included,3 raising questions about the unique impacts of stroke caregiving.
Lack of Long-Term Longitudinal Study
The study of stroke caregiving can focus on either reaction to the
initial crisis of stroke or long-term poststroke adaptation. Ideally,
both types of coping can be studied via longitudinal research. Most
stroke caregiving studies were cross-sectional. Only 5 of the 20
studies were longitudinal. One study29 reported that 42%
of stroke patients were still alive after a mean interval of 4.9 years
after stroke. Poststroke patients are more likely to develop dementia
over time,29 which may make caregiving more difficult over
time. Due to the stroke patients' prolonged survival and high risk of
developing dementia, it is important to know of factors related
to caregivers' depression and other outcomes beyond 2 or 3 years after
stroke. However, based on the current stroke caregiving literature,
little is known about the factors related to caregivers' outcomes at
several years after stroke. In fact, it will be important to study the
trajectories of stroke caregiving, which helps in understanding the
dynamic interaction relationship between caregivers and stoke patients
and the dynamic effect of emotional, social, physical, and mental
disabilities on caregivers' well-being. Moreover, it might enable
researchers to find and provide the different interventions according
to the different critical periods.
Sample Size and Statistical Power
To increase the sample size, 14 of the 20 studies did not control
the different impacts of caregiving for first-time stroke patients and
second-time stroke patients. The sample sizes of the 20 stroke
caregiving studies ranged from 20 to 302 (median, 86; mean, 96; SD,
64.5). None of the 20 studies reported their statistical power for
testing the stated hypothesis, raising concern about the reliability
and generalizability of these findings.
Statistical Methods
Many stroke caregiving studies used relatively simple methods,
such as ANOVA, t test, or simple correlation
analysis. To truly understand the complexity of stroke
caregiving outcomes, it is helpful to apply more advanced methods that
are often applied in other caregiving research, such as
multivariate analytical strategies, and structural
equation models, to assess complex theory-based models and
hypotheses.
Measures
The measurements used in stroke caregiving studies are very
diverse, and some researchers raised concerns about the validity and
reliability of measures used in the studies.25 30
Moreover, many measures are self-reported instruments, and little is
known the clinical significance of these outcomes. For example, 6 of
the 20 studies reported caregivers burden with 6 different measures.
These burden scales did not have established cutoff points. Moreover,
it would be inappropriate to use these burden scales for noncaregiver
comparison. Thus, assessment of the estimates of burden rate is
problematic.
Comparison of Caregivers and Noncaregivers
It is necessary to compare caregivers and noncaregivers in order
to differentiate unique stroke caregiving impacts. Without inclusion of
noncaregivers, it is difficult to define the extent of caregiver
outcomes beyond or below those found in the general population having
demographic status similar to that of stroke
caregivers.4 20
| Neglected Topics |
|---|
Ethnicity
Black Americans have higher risks of developing stroke than white
Americans.33 Moreover, both Native Americans and Hispanic
Americans have significant lower mean age at stroke onset than white
Americans.33 Several factors were striking in their
absence as variables studied as potential predictors. In
particular, none of the projects assessed whether ethnicity
predicts caregiver depression. Ethnicity is an especially important
issue to investigate, given the consistent findings in AD
caregiving literature that ethnicity has profound effects on
caregiving.34 35
Among the 20 stroke caregiving articles, only 3 indicated having black caregivers,14 36 37 ranging from 59% (n=89) to 61% (n=38) of the sample size. In addition, 3 article identified having "nonwhite" caregivers,12 22 38 ranging from 4.5% (n=44) to 14% (n=162) of the sample size. Unfortunately, none of the studies investigated the differences in depression between white and black stroke caregivers. No empirical evidence was reported about the effects of race, culture, and/or ethnicity on the stroke caregiving experience.
Time
The neurological recovery of stroke often improves significantly
within the 3-week period immediately after stroke, and the functional
recovery may continue to improve up to 18 months after
stroke.39 Thus, stroke patients who are at different time
periods after stroke generally have different severity and
manifestation of neurological deficits, and different levels of
functional impairments and depression status.12 25 40
Moreover, short-term coping for medical crisis is different from
long-term coping.
The impact of caregiving is more likely to be affected differently over time due to the coping process of caregivers and changing status of patients. Thus, the measurement of time interval of poststroke is a critical variable for study design, interpretation, and generalization of stroke caregiving. However, most studies paid little attention to time as a factor for caregivers' adaptation. Many stroke caregiving studies even did not report the mean time interval after stroke so that it was hard to compare the results of these studies to others.6 7 20 38 Some studies24 28 reported the mean time interval poststroke, however, the standard deviations of the mean interval were as long as eight months in these studies.
Positive Aspects of Caregiving
Current research has emphasized the negative impacts of stroke
caregiving. Even though stroke caregivers have to deal with the huge
amount of physical, emotional, and financial burden, most caregivers
are satisfied with their current life, and have positive feeling about
caregivers roles.6 12 28 37 About 17% of caregivers in
one study6 reported that caregiving improved their
relationship with care recipients. Further studies are needed to
systematically examine both negative aspects and positive aspects of
caregiving.
Special Problems in Stroke
The impacts of specific problems on stroke caregiving need to be
examined. For example, incontinence is a significant predicator of
stroke severity because of its association with mortality and
disability and its influence on the institutionalization of stroke
survivors.41 42 However, little is known about the effect
of incontinence on caregiving outcomes.
Only one of the 20 studies21 examined the caregiving outcomes of aphasia patients. Patients with severe aphasia and cognitive impairments cannot be readily interviewed. Taking care of aphasia patients might have unique impacts on caregiving outcomes. Future research is needed to test the effect of communication deficits on caregiving outcomes.
| Policy and Practice Implications of Current Studies |
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Recently published poststroke rehabilitation guidelines46 recommended that physicians and other health care professionals maximize the well-being of both patients and caregivers. However, one study37 reported that 22% of stroke caregivers felt that the physicians of stroke patients had not been particularly helpful to them. In fact, physicians' attention to caregivers is important for both caregivers and stroke patients. The rate of diagnosis and treatment for depression of stroke patients and caregivers was very low. Only 17.4% of depressed stroke patients were undergoing antidepressant drug treatment at 12 months after stroke onset.1 The depressed caregivers were taking more sedatives and nonpsychotropic drugs and were less likely to be taking antidepressants.7 If caregivers are depressed, then social rehabilitation of stroke patients may be less successful.7 Unless clinicians monitor both stroke patients and caregivers more closely to prevent and treat the adverse psychiatric outcomes, any other interventions might not be as effective.
In summary, it is unfortunate that researchers have paid little attention to family caregiving for elderly stroke patients. Evidence to date clearly suggests that stroke caregiving is highly stressful and leads to clinically significant depression in caregivers. Caregiving stress has the potential to hamper rehabilitation of the patients and is of vital importance both as a research topic and the focus of clinical care. Stroke caregiving studies may help us not only to better understand caregiving impact, but also to find the most effective interventions to improve the quality of life of stroke patients and their caregivers, reduce the burden and depression of caregivers, and decrease the need for long-term institutionalization.
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Received January 25, 1999; revision received March 16, 1999; accepted April 1, 1999.
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