Fatigue after stroke

Physical activity, sleep, and fatigue in community dwelling Stroke Survivors

Stroke can lead to physiological and psychological impairments and impact individuals' physical activity (PA), fatigue and sleep patterns. We analysed wrist-worn accelerometry data and the Fatigue Assessment Scale from 41 stroke survivors following a physical rehabilitation programme, to examine relationships between PA levels, fatigue and sleep. Validated acceleration thresholds were used to quantify time spent in each PA intensity/sleep category. Stroke survivors performed less moderate to vigorous PA (MVPA) in 10 minute bouts than the National Stroke guidelines recommend. Regression analysis revealed associations at baseline between light PA and fatigue (p = 0.02) and MVPA and sleep efficiency (p = 0.04). Light PA was positively associated with fatigue at 6 months (p = 0.03), whilst sleep efficiency and fatigue were associated at 9 months (p = 0.02). No other effects were shown at baseline, 6 or 9 months. The magnitude of these associations were small and are unlikely to be clinically meaningful. Larger trials need to examine the efficacy and utility of accelerometry to assess PA and sleep in stroke survivors.

Stroke in Frail Older People

The population is ageing, with the greatest proportional increase in those >80 years of age. Many of these people will be frail and at risk of stroke. Research has shown that the very old have much to benefit from hyperacute stroke intervention, but at the same time they suffer increased mortality. Their outcome following stroke and intervention is more often predicted by the presence of frailty rather than age alone. Intervention both in primary prevention and hyperacute stroke management needs to allow for preexisting morbidity and frailty in deciding what is and what is not appropriate, rather than an arbitrary decision on age. Frail older people are more likely to develop delirium and dysphagia combined with poor mouthcare and die, yet all of these issues are managed badly. An increased awareness of these complications of stroke in the frail older person is necessary.

Misconceptions about Stroke: Causal Attributions for Stroke-Related Symptoms Reflect the Age of the Survivor

With visible disabilities, observers tend to overgeneralise from the disability. In contrast, with invisible disabilities such as traumatic brain injury and stroke, observers often fail to allow for challenges resulting from the disability. Persons who have suffered a stroke claim that people misunderstand their symptoms and stigmatise them as a result of these symptoms. This misunderstanding, which happens particularly with young survivors of stroke, may reflect people's causal attributions for symptoms that follow a stroke. Using a scenario design, this cross-sectional study examined whether people attribute ambiguous symptoms that may result from stroke to other causes (the stroke survivor's personality and age) and whether these attributions reflect the age of the stroke survivor. Participants (N = 120) read scenarios describing a male who was aged either 22, 72, or whose age was unstated and who showed four symptom changes: fatigue, depression, irritability and reduced friendships. For each symptom change, participants rated three causal attributions: the person's age, his personality and stroke. The age of the person in the scenario affected attributions; when the person in the scenario was 22, participants attributed his symptoms significantly more to his personality than to his age or stroke, whereas when he was 72, participants attributed his symptoms more to his age than to his personality or stroke and when his age was unstated, they attributed his symptoms equally to age, stroke and personality. Because misattributions for stroke symptoms hinder rehabilitation, therapy can target people's misattributions to enhance rehabilitation for survivors of stroke.

Effects of the traditional Chinese herb Astragalus membranaceus in patients with poststroke fatigue: A double-blind, randomized, controlled preliminary study

BACKGROUND AND PURPOSE

Astragalus membranaceus (AM) is the first-choice herb for fatigue treatment in traditional Chinese medicine and the main herb used for stroke treatment in China and Taiwan. The purpose of this study was to evaluate the effect of AM on poststroke fatigue (PSF).

MATERIALS AND METHODS

This study was designed as a double-blind, randomized, controlled preliminary study. Sixty-four patients with PSF were assigned to treatment group (TG; 31 patients), which received oral administration of AM (2.8g three times per day) for 28 days, and a control group (CG; 33 patients), which received a placebo. The primary outcome measures were the changes in the European Organization for Research and Treatment of Cancer Quality of Life Questionnaire (EORTC QLQ-C30) and Brief Fatigue Index (BFI) scores RESULTS: A total of 61 patients (29 patients in the TG and 32 patients in the CG) completed the trial. The difference in BFI scores between Visit 2 and Visit 1 was -17.83±17.70 in the TG, which was greater than that in the CG (-8.03±9.95; p=0.01); additionally, the difference in BFI scores between Visit 3 and Visit 1 was -16.48±16.41 in the TG, which was also greater than that in the CG (-9.47±13.39; p=0.05). In the EORTC QLQ-C30, the difference in cognitive functioning scores between Visit 2 and Visit 1 was 14.37±13.89 in the TG, which was greater than that in the CG (3.65±19.74; p=0.02); additionally, the difference in these scores between Visit 3 and Visit 1 was 14.37±16.50 in the TG, which again was greater than that in the CG (6.25±19.74; p=0.04). The difference in social functioning scores between Visit 3 and Visit 1 was 9.77±15.12 in the TG, which was greater than that in the CG (-1.56±20.46; p=0.01). The difference in global quality of life (QOL) scores between Visit 2 and Visit 1 was 14.08±18.78 in the TG, which was also greater than that in the CG (1.56±18.14; p=0.003); moreover, the difference in these scores between Visit 3 and Visit 1 was 10.92±17.55 in the TG, and this was greater than that in the CG (1.82±15.8; p=0.05).

CONCLUSION

AM can improve BFI scores; cognitive functioning, social functioning, and global QOL scores in the EORTC QLQ-C30. Our results suggest that physicians should pay close attention to the unmet medical needs of patients with PSF. AM is helpful for treating patients with PSF; however, additional studies with a larger sample and a longer period of investigation are required.

The Neuro-Immune Pathophysiology of Central and Peripheral Fatigue in Systemic Immune-Inflammatory and Neuro-Immune Diseases

Many patients with systemic immune-inflammatory and neuro-inflammatory disorders, including depression, rheumatoid arthritis, systemic lupus erythematosus, Sjögren's disease, cancer, cardiovascular disorder, Parkinson's disease, multiple sclerosis, stroke, and chronic fatigue syndrome/myalgic encephalomyelitis, endure pathological levels of fatigue. The aim of this narrative review is to delineate the wide array of pathways that may underpin the incapacitating fatigue occurring in systemic and neuro-inflammatory disorders. A wide array of immune, inflammatory, oxidative and nitrosative stress (O&NS), bioenergetic, and neurophysiological abnormalities are involved in the etiopathology of these disease states and may underpin the incapacitating fatigue that accompanies these disorders. This range of abnormalities comprises: increased levels of pro-inflammatory cytokines, e.g., interleukin-1 (IL-1), IL-6, tumor necrosis factor (TNF) α and interferon (IFN) α; O&NS-induced muscle fatigue; activation of the Toll-Like Receptor Cycle through pathogen-associated (PAMPs) and damage-associated (DAMPs) molecular patterns, including heat shock proteins; altered glutaminergic and dopaminergic neurotransmission; mitochondrial dysfunctions; and O&NS-induced defects in the sodium-potassium pump. Fatigue is also associated with altered activities in specific brain regions and muscle pathology, such as reductions in maximum voluntary muscle force, downregulation of the mitochondrial biogenesis master gene peroxisome proliferator-activated receptor gamma coactivator 1-alpha, a shift to glycolysis and buildup of toxic metabolites within myocytes. As such, both mental and physical fatigue, which frequently accompany immune-inflammatory and neuro-inflammatory disorders, are the consequence of interactions between multiple systemic and central pathways.

Exploring the experience of post-stroke fatigue in community dwelling stroke survivors: a prospective qualitative study

PURPOSE

To explore the experience of post-stroke fatigue in community-dwelling stroke survivors with and without post-stroke mood disturbance within one year of stroke.

METHODS

This was a prospective qualitative cohort study including semistructured interviews undertaken at baseline (stroke onset), 3, 6, 9 and 12 months in 23 stroke survivors; eight single interviews were held with "supplementary" participants. Qualitative data analysis involved an inductive thematic approach using a process of constant comparison.

RESULTS

Thirty-one participants (17 men, 14 women; age range 37-94 years) took part in 122 interviews. The majority of participants was independent and experienced few major depressive symptoms. Three trajectories emerged regarding the participants' experiences of fatigue including experience of fatigue, coping strategies and knowledge.

CONCLUSIONS

The results of this study suggest that in spite of reasonable objective physical recovery post-stroke, fatigue in community-dwelling stroke survivors may be disabling. The use of qualitative methodology was sensitive in identifying the factors that play a role in the experience of fatigue. The essential role of health professionals in this context is to provide support and education regarding fatigue and to promote participation after stroke in therapy programs. Routine practice for stroke services should include fatigue advice prior to discharge.

Serum cytokine and glucose levels as predictors of poststroke fatigue in acute ischemic stroke patients

Fatigue is a common but often overlooked symptom after stroke. This study investigated whether stroke type, infarct volume, and laterality, as well as the levels of various cytokines and other blood components in the acute phase of acute ischemic stroke (AIS), can predict the level of fatigue at 6, 12, and 18 months after its onset. In 45 patients with acute stroke, serum levels of C-reactive protein, hemoglobin, glucose, and 13 cytokines were measured within 72 h of stroke onset. The cytokine measurements were performed using BioPlex XMap technology (Luminex). The acute serum levels of interleukin (IL)-1β and glucose were positively correlated with the score on the Fatigue Severity Scale (FSS) at 6 months after the stroke (r = 0.37, p = 0.015, and r = 0.37, p = 0.017, respectively). The acute serum levels of IL-ra and IL-9 were negatively correlated with FSS score at 12 months after the stroke (r = −0.38, p = 0.013, and r = −0.36, p = 0.019, respectively). The FSS score at 12 months after stroke was significantly lower in patients with radiologically confirmed infarction than in those without such confirmation (p = 0.048). The FSS score at 18 months was not correlated with any of the measured variables. High acute serum levels of glucose and IL-1β, and low IL1-ra and IL-9 may predict fatigue after AIS, indicating that the development of poststroke fatigue can be accounted for by the proinflammatory response associated with AIS. These novel findings support a new cytokine theory of fatigue after stroke. However, more research is needed to validate the results of this study.

Fatigue in stroke rehabilitation patients: a pilot study

BACKGROUND AND PURPOSE

Stroke is the leading cause of adult disability. Rehabilitation is a vital component of post-stroke care with two-thirds of survivors requiring rehabilitation. Fatigue is a common issue affecting stroke patients and is a barrier to rehabilitation causing inefficient care provision and potential limitation to patient recovery. No study to date has investigated whether the experience of fatigue is different between the two main causes of ischemic stroke: small-vessel (SVD) and large-vessel disease (LVD). The aim of the present study is to complete a pilot study to inform the feasibility, design, magnitude of difference in experience of fatigue, and sample size for a definitive study to evaluate differences in fatigue between these two groups of stroke patients. The experimental hypothesis is that participants with LVD experience a significantly greater level of fatigue than those with SVD as assessed by the Fatigue Severity Scale (FSS).

METHODS

The study used a cohort observational design. Thirteen participants were recruited over a two-month period from King's College Hospital. Participants were visited on average at the start of the second week of rehabilitation to complete the FSS. An independent t-test and ANCOVA were performed. For all statistical analyses, a significance level of p<0.05 was used.

RESULTS

The study demonstrated a trend towards LVD participants reporting higher fatigue scores than SVD participants, even when controlling for age, with gender having no confounding effect.

CONCLUSIONS

Fatigue is common amongst ischemic stroke rehabilitation participants with 85% of the combined sample experiencing fatigue at the start of the second week. The results demonstrate a trend towards LVD participants experiencing greater fatigue. While the results were non-significant, the study demonstrates a feasible methodology which could help lay the groundwork for future research.

A population-based study of the prevalence of fatigue after transient ischemic attack and minor stroke

BACKGROUND AND PURPOSE

Fatigue is common after stroke and can be attributable to the increased physical effort associated with severe neurological deficits; however, its presence in those with little motor deficit raises the possibility of confounding by other factors, such as comorbidity, anxiety, and medication. To control for such factors and determine the extent of stroke-specific fatigue, we compared patients with minor stroke who had little or no residual neurological deficit with patients with TIA; both groups had undergone similar investigations and treatment.

METHODS

The prevalence of fatigue 6 months after TIA or minor stroke was assessed in consecutive patients using the Chalder fatigue scale in a population-based incidence study (Oxford Vascular Study). Patients were included if they were independent in self-care Barthel Index (>or=18/20) and without major cognitive impairment (Mini-Mental State Examination >or=24/30). Stroke severity at baseline was assessed with the National Institute of Health Stroke Scale (NIHSS). Other potential causes of fatigue were assessed including anxiety, depression, recent life events, medication, and abnormalities in biochemistry or hematologic tests.

RESULTS

Seventy-six participants had minor stroke (mean age, 74.1 years; 42 men) and 73 had TIA (mean age, 72.5 years; 40 men). At 6-month follow-up, median Barthel Index score was 20 (interquartile range, 20-20) in both groups. However, fatigue was more common after stroke than TIA (56% vs 29%; OR, 3.14; 95% CI, 1.51-6.57; P=0.0008). This difference was present both in patients with modified Rankin score of 0 at 6 months (23.8% vs 10.3%) and patients with modified Rankin score >or=1 (69.2% vs 48.6%), and remained more frequent in stroke patients after adjustment for potential confounders. Within the group of patients with stroke, the prevalence of fatigue increased with initial stroke severity (87% NIHSS >or=4 vs 48% NIHSS <or=3; P=0.0087); however, stroke patients with initial NIHSS of 0 were still more fatigued than patients with TIA (57% vs 29%; P=0.015).

CONCLUSIONS

The prevalence of fatigue after minor stroke is higher than after TIA, suggesting that it is not simply a consequence of the stress of a recent acute cerebral event, comorbidity, medication, or other potential confounders. The high levels of fatigue in stroke patients without neurological impairment suggest it has a central origin rather than being the result of increased physical effort required after stroke.