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Post-stroke fatigue—where is the evidence to
guide practice?
Suzanne Barker-Collo, Valery L Feigin, Margaret Dudley
Post-stroke fatigue and its impactStroke is the second most common cause of death worldwide
and the leading cause of disability in adults, having an enormous physical,
psychological, and financial impact.1,2 A
significant proportion of stroke survivors (39–72%) suffer from persistent
and significant fatigue affecting their daily lives, with significant
differences in prevalence likely related to varying definitions and methods of
assessing fatigue, as well as sampling of different
populations.3–8
Defining post-stroke fatigue (PSF) is a challenge as it
represents a complex interaction of biological, psychosocial, and behavioral
phenomena.9 Subjective fatigue is commonly
defined as a feeling of early exhaustion or tiredness developing during either
mental or physical activity, or both, with weariness, lack of energy, and
aversion to effort.5,10 One recent systematic
review of self-reported instruments for fatigue assessment defines fatigue as
“An unpleasant physical, cognitive, and emotional symptom described as a
tiredness not relieved by common strategies that restore
energy.”11
By its very definition, fatigue involves behavioural and
work performance decrement, and is characterised by distress and decreased
functional status related to reduced energy.12
Post-stroke fatigue, either cognitive and/or physical, often poses a barrier to
return to work and other daily activities, quality of life, and rehabilitation,
especially during the first year after stroke
onset.4,5,13-16 Indeed, it has been shown that
fatigue is associated with profound deterioration of several aspects of everyday
life.3,7
In a 2-year stroke follow-up population-based Swedish
study,3 fatigue independently predicted
decreased functional independence, institutionalisation, and case-fatality.
Similarly, a case-control study in the
Netherlands17 found that PSF correlates
significantly with functional disability and neuropsychological deficits.
Furthermore, PSF may impede full participation in a rehabilitation
program.14
Interestingly, stroke survivors with less severe physical or
cognitive disability tend to rate fatigue as a more severe
symptom,4,9,18 which, according to de Groot et
al,19 may be related to the relative lack of
other post-stroke sequelae and greater expectation for full recovery and
differing demands of daily life in these patients.
Prevalence and natural historyOf 4023 2-year stroke survivors in
Sweden,20 366 (10%) reported always feeling
tired and 1070 (29.2%) additional survivors were often tired. Two years post
stroke approximately 40% of patients report that they are “always”
or “often” fatigued.3,4,17
The frequency of self-reported fatigue is roughly twice as
high in patients post stroke as it is in matched controls, and 27% of stroke
survivors experience fatigue every day.4
Although fatigue is known to persist for months and even years
post-stroke,4,17 the time which has elapsed
since the stroke occurred can not explain levels of
fatigue.4,17
In a Canadian case-control study, fatigue was also not
related to stroke severity, or lesion
location.4 In that study, 40% of the stroke
group reported that fatigue was either their worst or one of their worst
symptoms. Although most of these studies evaluated fatigue in elderly stroke
survivors, there is some evidence suggesting that post-stroke fatigue is more
prevalent in younger that in older patients.3
In regards to the time course of PSF, a recent study of 167
survivors of first-ever stroke,7 assessed
fatigue at admission, 6-months post-stroke, and 1-year post stroke and found it
to be present in 51.5%, 64.1%, and 69.5%, respectively. Fatigue was present at
all three assessments in 37.7% of patients, and absent on all three assessments
in 17.4% of patients.
Although fatigue is often seen as a result of sleep apnoea,
post-stroke depression, and disability,6,21,22
a concept of 'primary' post-stroke fatigue has been
proposed.5 According to this concept, fatigue
may develop in the absence of depression or significant cognitive sequelae, and
may be linked to attentional deficits resulting from specific damage to the
reticular formation and related structures involved in the subcortical
attentional network.
Fatigue is one of the symptoms of depression, but does not
include the accompanying inappropriate feelings of anhedionia, worthlessness,
hopelessness, or suicidal ideation.23 There is
evidence that the presence of post-stroke fatigue is independent of
depression.3 In a 2-year follow-up of
post-stroke fatigue, of 3667 patients who were not depressed, 10% (n =366)
always felt tired, while an additional 29.2% (n=1070) often felt
tired.3 When depression and fatigue do
co-occur, the impact of fatigue on functional abilities is strongly influenced
by depression.4
In addition to depression, PSF must also be differentiated
from symptoms of executive disturbances such as apathy. Executive dysfunction is
typified by an inability to engage in goal-directed behaviours, of which
difficulty initiating behaviour may be a
symptom.24 Thus, a patient with executive
dysfunction may express an intention to engage in a particular behaviour but not
actually be able to initiate that behaviour without assistance, which may be
viewed by others as patient apathy. This is very different from the individual
with fatigue who would typically state that they cannot engage in an activity
due to their fatigue, and who is able to initiate behaviour if she/he desires to
do so, but may not be able to complete the behaviour due to fatigue.
Anxiety may also present as fatigue, though anxiety may be
differentiated using techniques such as SWIKIR (Somatic Symptoms, Worries,
Irritability, Keyed-up or on edge, Initial insomnia, and Relaxation
Difficulties), whereby anxiety disorder is present if 3 or more symptoms are
reported.25
Measuring post-stroke fatigueMany unidimensional and multidimensional scales have been
developed attempting to measure the nature, severity, and impact of fatigue in a
range of clinical populations.10,11,26
Different scales purport to measure different aspects of fatigue and it has been
suggested that measures developed to measure fatigue in one clinical condition
may not be justified for other clinical
conditions.10 However, it has also been
suggested that “since fatigue is an unspecific symptom there should not be
need for adopting disease specific fatigue scales for each individual
disease.”26 In this situation the choice
of the most appropriate fatigue measurement scale to be used for research or
clinical practice should be determined by aspects of fatigue that need to be
measured.10
While there is no consensus on which fatigue scales are most
appropriate for use in the assessment of fatigue in stroke survivors, the most
commonly used in stroke populations10 include
the Visual Analogue Scale (used in three
studies);15,27,28 Fatigue Severity Scale (used
in five studies);4,7,15,27,29 Checklist
Individual Strength (used in one study);17 and
quality of life fatigue subscales, including SF-36 (used in three
studies)30-32 and Newcastle Stroke specific
Quality of Life measure (used in one study).33
Of these, two objective assessment tools (Fatigue Severity
Scale and Checklist Individual Strength) have been recently recommended by de
Groot et al19 to quantify fatigue
characteristics for initial diagnosis and to monitor the outcome of fatigue
treatment in stroke survivors, although it was mentioned that “scales or
measures used in the study of fatigue in other patient populations may also
prove useful for application to post-stroke fatigue.”
Electromyography has also been used to evaluate
neuromuscular fatigue post-stroke,34 but this
measurement has limited value in the overall evaluation of post-stroke fatigue
in which multiple dimensions of fatigue are usually involved.
Right hemispheric strokes have been implicated in fatigue
because of disconnection between the right insula and frontal lobe or anterior
cingulated cortex.35 Fatigue has also been
associated with damage to the brainstem and thalamic regions—affecting the
reticular activating formation that regulates
wakefulness.5,36 However, these physical
associations with fatigue are inconsistent,4
and do not explain the widespread incidence of fatigue post stroke.
Other identified predictors of post-stroke fatigue include
living alone or in an institution, impairment in activities of daily living
(ADL), and recurrent stroke.3 Although older
female stroke survivors were more likely to report fatigue in one
study,3 no association between fatigue and
demographic variables was found in other
studies.4,17 Given these multiple potential
causes of post-stroke fatigue, any assessment of fatigue must be
multidimensional, and treatment approaches are likely to be differentially
beneficial in different etiologically defined subgroups.
Fatigue management— what is available?Despite the high prevalence of post-stroke fatigue and its
detrimental effects, studies for post-stroke fatigue interventions are scarce.
Indeed, a search of the United Kingdom’s National Clinical Guidelines for
Stroke (2nd
edition)37 and its tables of evidence reveals
no evidence on treatments for fatigue, nor is there any mention of fatigue as a
condition requiring treatment.
Fatigue is not mentioned in the New Zealand guidelines for
stroke management,38 yet it has been emphasised
that intervention studies are urgently needed for this potentially treatable
sequelae of stroke.3–7,15,39
Because the causes of fatigue are multidimensional and
interrelated, a considerable range of fatigue management options are available,
including cause-specific treatments, pharmacological intervention, and
non-pharmacological interventions, including educational programs. For example,
stroke patients who have been inactive and/or ill for periods of time may have
nutritional or metabolic deficits resulting in fatigue.
Treating anaemia and supporting nutrition, or correcting
electrolyte and fluid imbalances may make positive differences for these
patients. In addition, comorbidities common to older adults such as arthritis,
thyroid function changes, respiratory disease, altered glucose metabolism, or
cardiovascular disease may contribute to fatigue and their treatment may lessen
fatigue symptoms.40
Use of psychostimulants and antidepressants (where fatigue
is intermingled with depression) may offer some relief from the symptoms of
fatigue related to HIV and multiple
sclerosis.41,42 When stroke causes low
initiation and psychomotor retardation, which may be interpreted as motor
fatigue or executive dysfunction, tricyclic antidepressants such as
methylphenidate have been successfully used to improve functional independence
and mood.4,43
Several non-pharmacological interventions have also been
linked to reduced fatigue including therapeutic recreation and social
activities, and complementary activities such as
biofeedback,44 relaxation and
meditation,45
music,46,47 and pet
therapy;48 which are thought to offer benefits
through distraction and stress reduction which may ameliorate the impact of
fatigue. Their specific benefits in alleviation of post-stroke fatigue in
randomised controlled trials have yet to be established.
We have been able to identify only one randomised controlled
trial of fatigue management in stroke
survivors.27 In that small (n=83) double-blind
placebo-controlled trial, consecutive outpatient stroke survivors (average 14
months post stroke) were randomly assigned to either fluoxetine (antidepressant
of the selective serotonin reuptake inhibitor class) 20 mg/day (n=40) or placebo
(n=43) given over 3 months. Follow-up evaluations at 3 and 6 months after the
beginning of the treatment, included the Visual Analogue Scale (mean score
5.4±2 at baseline) and Fatigue Severity Scale (mean score 4.4±1.2 at
baseline).
Percent change in the fatigue scales and the proportion of
patients with fatigue did not differ between the treatment groups at either
follow-up assessments. However, fluoxetine significantly improved post-stroke
emotional incontinence and depression in patients with fatigue. The authors
concluded that post-stroke fatigue may be associated with diverse aetiologies
(but not closely related to serotonergic dysfunction), and that further studies
are required to elucidate the causative factors to find an appropriate treatment
for post-stroke fatigue.
Psychoeducation for fatigue managementIt has been suggested that studies are needed to evaluate
whether rehabilitation strategies that include not only fitness and mobility
interventions, but also social/behavioural and self-efficacy components, are
associated with reduced fatigue and increased
ambulation.15
Despite there being no literature on its efficacy, patient
and family education and counselling has been identified as the most important
rehabilitation nursing intervention for the management of stroke-related
fatigue.14 Indeed, it has been suggested that
patient education regarding post-stroke fatigue should be made available for
patients, their caregivers, and families.14,19
This general approach to fatigue management is of particular relevance in the
absence of a clear causal mechanism.
Such programmes typically provide anticipatory guidance
about the likely experience of fatigue with the goal of diminishing distress and
misunderstanding if fatigue occurs; helping to maintain a sense of control.
Identification of fatigue-provoking activities, problem-solving and
identification of fatigue management strategies are also provided, including
energy conservation strategies (e.g., prioritizing, sleep hygiene, pacing,
delegating, scheduling rest) and establishing appropriate balance between rest
and activity.
Individually tailored increased physical activity may be
beneficial in overcoming the self-perpetuating cycle of inactivity,
deconditioning, and fatigue commonly observed in stroke
survivors.19 As stated by Clarke and
Lacasse49 the goal of fatigue management is to
equip patients with multiple self-help strategies to successfully alleviate or
lessen fatigue throughout the disease process.
Unfortunately, there is no literature on the impact of
educational programmes for fatigue post-stroke. There is, however, a literature
available from other populations, including patients with cancer, multiple
sclerosis, and those with traumatic brain injury. For instance, in cancer
survivors, Fawzy50 found that those who
received a 6-hour intervention involving education on health promotion, stress
management, and coping skills resulted in significantly greater decrease in
fatigue compared with controls. In addition,
Keyes51 found that participation in a single
60-minute psycho-educational fatigue management session produced significantly
lower levels of behavioural, sensory, cognitive, and total fatigue compared to a
control condition.
There is evidence of the effectiveness of educational
fatigue management in multiple
sclerosis.52–54 In a recent evaluation of
a 16-hour fatigue management education programme, participants rated the
programme highly or very highly, and there was a trend towards significant
improvement in quality of life measures which may have resulted from small
sample size (N=10 with 2 drop-outs).55
In a recent traumatic brain injury
study,56 seven participants with acquired brain
injury participated in an 8-session educational programmed for post-injury
fatigue. Quality of life as measured by the SF-36 improved significantly; there
was a small non-significant drop in scores on the Brain Injury Fatigue Scale
that was not linked to changes in mood.
Comprehensiveness (targeting multiple causes of fatigue),
involvement of caregivers and family members, individual tailoring, relative
simplicity, and non-pharmacological content are some of the clear advantages of
these educational programmes.
Factors contributing to the problemSeveral factors are likely to contribute to the lack of
evidence for post-stroke fatigue management. First and foremost, as noted
earlier, there is no accepted definition of fatigue, and “no single
measure of fatigue adequately captures the complexity of the
phenomenon.”9 Furthermore, while there
are a number of measures specific to fatigue that can be used, none of these
have been validated in stroke populations. Indeed, only one stroke-specific
quality of life measure has been developed to include a subscale for fatigue
consisting of three items.33
In addition to this difficulty in quantifying fatigue, the
causes of post-stroke fatigue differ from person to person and may include
physical causes such as pain, disease, anaemia, inactivity, or other health
problems.57 It has been proposed that
post-stroke fatigue may result from the combined effects of organic brain
lesions and psychosocial stress related to changes in life
situation.58,59
Given these multiple potential causes of post-stroke
fatigue, any assessment of fatigue must be multidimensional, and treatment
approaches are likely to be differentially beneficial in different etiologically
defined subgroups.
Finally, as previously noted, stroke survivors with less
severe physical or cognitive disability tend to rate fatigue as a more severe
symptom. Related to this is the possibility that difficulties with fatigue are
less likely to become apparent while an inpatient, becoming evident only when
one attempts to take-up his/her previous activities. This is reflected in
increased reports of fatigue over the first year
post-stroke.7
Where to from here?
The above literature identifies fatigue as a prevalent
debilitating and distinct sequelae of stroke that has detrimental effects not
only on the quality of life and other functional outcomes in these patients but
also impedes their effective rehabilitation.
While a number of challenges remain in the assessment and
treatment of post-stroke fatigue, the existing literature from other population
groups could act as a springboard to much needed research in this area. In
particular, there is a need to better differentiate those most likely to suffer
post-stroke fatigue, to validate existing assessments of fatigue, and to
evaluate the efficacy of fatigue management and treatment strategies in stroke
survivors.
Competing interests: None.
Author information: Suzanne
Barker-Collo1, Valery L.
Feigin2, Margaret
Dudley3
Correspondence: Suzanne
Barker-Collo PhD, Department of Psychology, Faculty of Science, The University
of Auckland, Private Bag 92019, Auckland, New Zealand. Fax: +64 9 373 7450;
email: s.barker-collo@auckland.ac.nz
References:
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