stroke population
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2022 ◽  
Vol 12 ◽  
Author(s):  
Nan Xia ◽  
Chang He ◽  
Yang-An Li ◽  
Minghui Gu ◽  
Zejian Chen ◽  
...  

Objectives: To demonstrate the task-specificities of anticipatory muscle activations (AMAs) among different forward-reaching tasks and to explore the StartleReact Effect (SE) on AMAs in occurrence proportions, AMA onset latency or amplitude within these tasks in both healthy and stroke population.Methods: Ten healthy and ten stroke subjects were recruited. Participants were asked to complete the three forward-reaching tasks (reaching, reaching to grasp a ball or cup) on the left and right hand, respectively, with two different starting signals (warning-Go, 80 dB and warning-startle, 114 dB). The surface electromyography of anterior deltoid (AD), flexor carpi radialis (FCR), and extensor carpi radialis (ECR) on the moving side was recorded together with signals from bilateral sternocleidomastoid muscles (SCM), lower trapezius (LT), latissimus dorsi (LD), and tibialis anterior (TA). Proportions of valid trials, the incidence of SE, AMA incidence of each muscle, and their onset latency and amplitude were involved in analyses. The differences of these variables across different move sides (healthy, non-paretic, and paretic), normal or startle conditions, and the three tasks were explored. The ECR AMA onset was selected to further explore the SE on the incidence of AMAs.Results: Comparisons between move sides revealed a widespread AMA dysfunction in subacute stroke survivors, which was manifested as lower AMA onset incidence, changed onset latency, and smaller amplitude of AMAs in bilateral muscles. However, a significant effect of different tasks was only observed in AMA onset latency of muscle ECR (F = 3.56, p = 0.03, η2p = 0.011), but the significance disappeared in the subsequent analysis of the stroke subjects only (p > 0.05). Moreover, the following post-hoc comparison indicated significant early AMA onsets of ECR in task cup when comparing with reach (p < 0.01). For different stimuli conditions, a significance was only revealed on shortened premotor reaction time under startle for all participants (F = 60.68, p < 0.001, ηp2 = 0.056). Furthermore, stroke survivors had a significantly lower incidence of SE than healthy subjects under startle (p < 0.01). But all performed a higher incidence of ECR AMA onset (p < 0.05) than with normal signal. In addition, the incidence of ECR AMAs of both non-paretic and paretic sides could be increased significantly via startle (p ≤ 0.02).Conclusions: Healthy people have task-specific AMAs of muscle ECR when they perform forward-reaching tasks with different hand manipulations. However, this task-specific adjustment is lost in subacute stroke survivors. SE can improve the incidence of AMAs for all subjects in the forward-reaching tasks involving precision manipulations, but not change AMA onset latency and amplitude.


2022 ◽  
Vol 163 (1) ◽  
pp. 3-11

Összefoglaló. A malignus daganat és a stroke egy-egy betegnél gyakran kombinálódik, sokszor egyidejűleg diagnosztizálják, vagy rövid idő telik el a két kórkép felismerése között. Az együttes megjelenés hátterében elsősorban a hasonló tradicionális rizikófaktorok állhatnak: az idősebb életkor, a magas vérnyomás, a hyperlipidaemia, a cukorbetegség, az elhízás és a dohányzás. Az átfedő kockázati tényezőkön túl a daganat által okozott hiperkoaguláció artériás és vénás thrombosis kialakulásához vezethet. A hiperkoaguláció hátterének kutatása főként a thrombocyták és a szöveti faktor aktiválására és a heparanáz fokozott expressziójára fókuszált, és felvetődött a neutrophil extracelluláris csapdák szerepe is. A daganat által okozott hiperkoagulációhoz társuló cryptogen (tradicionális rizikófaktor nélküli) stroke-ban sokszor található magasabb D-dimer-szint, és a CT/MRI-képeken gyakrabban látszanak multifokális, több ér ellátási területében megjelenő ischaemiás laesiók, melyek ritkábban fordulnak elő a tradicionális rizikófaktorokkal magyarázható stroke-okban. Az előzőkön kívül a daganatok kezelésére alkalmazott kemoterápia és sugárterápia is emeli a stroke kockázatát. A malignus daganatokhoz társuló stroke-ok megelőzése érdekében további vizsgálatok szükségesek a daganat által okozott hiperkoaguláció és vascularis változások pontosabb megértéséhez. Orv Hetil. 2022; 163(1): 3–11. Summary. Cancer and stroke have long been studied individually, but their detrimental forces together have also been a strong point of focus. The occurrence of both cancer and stroke in a patient is often a reflection of their similar risk factors (hypertension, hyperlipidemia, diabetes, obesity, and smoking), however, a subgroup of the cancer stroke population is believed to occur due to cancer-associated hypercoagulability. A deeper look into the cancer-associated hypercoagulable environment has indicated that thrombosis may be explained by cancer’s role in several factors, including activation of platelets and tissue factor, elevated expression of heparanase and influence on neutrophilic extracellular traps. When a cryptogenic stroke (stroke lacking the aforementioned risk factors) occurs due to the cancer-induced hypercoagulation state, patient serum D-dimer levels have been found elevated, and CT/MRI images of the brain have shown multivascular infarctions compared to stroke patients with traditional risk factors. Additionally, cancer treatment – chemotherapy and radiation – have also been found to increase the occurrence of cerebral vascular thrombosis. Further investigations are required to better understand cancer-associated vascular pathophysiologic changes and how to discern their unique strokes compared to strokes from other etiologies. With these insights, the prevalence of strokes in the cancer population could be decreased. Orv Hetil. 2022; 163(1): 3–11.


2021 ◽  
Vol 10 (24) ◽  
pp. 5912
Author(s):  
Daniel Richter ◽  
Jeyanthan Charles James ◽  
Andreas Ebert ◽  
Aristeidis H. Katsanos ◽  
Lisa Mazul-Wach ◽  
...  

There are controversial data on the efficacy and safety profile of selective serotonin reuptake inhibitors (SSRIs) to prevent post-stroke depression (PSD). We performed a systematic search in MEDLINE and SCOPUS databases to identify randomized-controlled trials questioning the use of early SSRI therapy in the post-stroke population and its effect on PSD incidence. We included 6 studies with 6560 participants. We extracted the data on PSD occurrence in association with the treatment arm (SSRI versus placebo), as reported by each study. For safety analysis, we extracted the information on adverse events. A random-effects model was used to calculate the pooled relative risk estimates. Early SSRI therapy was associated with a significant reduction of PSD occurrence compared to placebo (10.4% versus 13.8%; relative risk: 0.75 [95% CI, 0.66–0.86]; absolute risk reduction: 3.4%). SSRI therapy increases the risk of bone fracture (RR 2.28 [95% CI, 1.58–3.30]) and nausea (RR 2.05 [95% CI, 1.10–3.82]) in the post-stroke population. Considering the risk-benefit ratio of early SSRI therapy in the post-stroke population, future research should identify high-risk patients for PSD to improve the risk-benefit consideration of this therapy for use in clinical practice.


2021 ◽  
Author(s):  
Lydia G. Brough ◽  
Steven A. Kautz ◽  
Richard Neptune

Abstract Background Successful walking requires the execution of the pre-swing biomechanical tasks of body propulsion and leg swing initiation, which are often impaired post-stroke. While excess rectus femoris activity during swing is often associated with low knee flexion, previous work has suggested that deficits in propulsion and leg swing initiation may also contribute. The purpose of this study was to determine underlying causes of propulsion, leg swing initiation and knee flexion deficits in pre-swing and their link to stiff knee gait in stroke survivors. Methods Musculoskeletal models and forward dynamic simulations were developed for individuals post-stroke (n=15) and neurotypical participants (n=5). Linear regressions were used to evaluate the relationships between peak knee flexion, braking and propulsion symmetry, and individual muscle contributions to braking, propulsion, knee flexion in pre-swing, and leg swing initiation. Results 27% of individuals post-stroke had higher plantarflexor contributions to propulsion and 47% had higher vasti contributions to braking on their paretic leg relative to their nonparetic leg. Higher gastrocnemius contributions to propulsion were correlated to paretic propulsion symmetry (p=0.005) while soleus contributions were not. Higher vasti contributions to braking in pre-swing predicted lower knee flexion (p=0.022). The rectus femoris and iliopsoas did not directly contribute to lower knee flexion acceleration in pre-swing compared to contributions from the vasti. However, for some individuals with low knee flexion, during pre-swing the rectus femoris absorbed more power and the iliopsoas contributed less power to the paretic leg. Total muscle-tendon work done on the paretic leg in pre-swing was not correlated to knee flexion during swing. Conclusions These results emphasize the multiple causes of propulsion asymmetry in individuals post-stroke, including low plantarflexor contributions to propulsion, increased vasti contributions to braking and reliance on compensatory mechanisms. The results also show that the rectus femoris is not a major contributor to knee flexion in pre-swing, but absorbs more power from the paretic leg in pre-swing in some individuals with stiff knee gait. These results further highlight the heterogeneity of the post-stroke population and the need to identify individual causes of propulsion and knee flexion deficits to improve rehabilitation outcomes.


2021 ◽  
Vol 15 ◽  
Author(s):  
Joris van der Cruijsen ◽  
Maria Carla Piastra ◽  
Ruud W. Selles ◽  
Thom F. Oostendorp

The inconsistent response to transcranial electric stimulation in the stroke population is attributed to, among other factors, unknown effects of stroke lesion conductivity on stimulation strength at the targeted brain areas. Volume conduction models are promising tools to determine optimal stimulation settings. However, stroke lesion conductivity is often not considered in these models as a source of inter-subject variability. The goal of this study is to propose a method that combines MRI, EEG, and transcranial stimulation to estimate the conductivity of cortical stroke lesions experimentally. In this simulation study, lesion conductivity was estimated from scalp potentials during transcranial electric stimulation in 12 chronic stroke patients. To do so, first, we determined the stimulation configuration where scalp potentials are maximally affected by the lesion. Then, we calculated scalp potentials in a model with a fixed lesion conductivity and a model with a randomly assigned conductivity. To estimate the lesion conductivity, we minimized the error between the two models by varying the conductivity in the second model. Finally, to reflect realistic experimental conditions, we test the effect rotation of measurement electrode orientation and the effect of the number of electrodes used. We found that the algorithm converged to the correct lesion conductivity value when noise on the electrode positions was absent for all lesions. Conductivity estimation error was below 5% with realistic electrode coregistration errors of 0.1° for lesions larger than 50 ml. Higher lesion conductivities and lesion volumes were associated with smaller estimation errors. In conclusion, this method can experimentally estimate stroke lesion conductivity, improving the accuracy of volume conductor models of stroke patients and potentially leading to more effective transcranial electric stimulation configurations for this population.


2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Li Jing ◽  
Yuanmeng Tian ◽  
Guocheng Ren ◽  
Limin Zhang ◽  
Lei Shi ◽  
...  

Abstract Background Hypertension remains the major modifiable risk factor of stroke recurrence. The study aimed to determine the up-to-date epidemiological features of hypertension among the survivors of ischemic stroke. Methods Our cross-sectional study included 18,796 adults aged ≥40 years and residing in northeast China. Ischemic stroke was diagnosed according to the World Health Organization’s criteria, which requires the clinical record, computed tomography (CT) and/or magnetic resonance imaging (MRI) during the hospital stay. Hypertension was defined according to the Chinese hypertension guidelines (mean SBP ≥140 mmHg and/or mean DBP ≥90 mmHg, and/or self-reported use of anti-hypertensive medication in the past 2 weeks). Results Of the 986 survivors of ischemic stroke, 819 (83.1%) were identified with hypertension (535 were pre-stroke hypertension and 284 were post-stroke hypertension). Among hypertensive patients, the awareness and treatment rates were 76.8 and 66.7% respectively. Only 11.0% achieved an appropriate blood pressure (< 140 mmHg and < 90 mmHg) among those who took hypertensive medications. 16.8% of treated hypertensive patients received combination therapy, and calcium channel blockers were the most frequently used anti-hypertensive medication as monotherapy. The mean systolic blood pressure (SBP) and diastolic blood pressure (DBP) of the stroke population was 155.3 ± 22.9 mmHg and 89.2 ± 12.3 mmHg. Both SBP and DBP were higher in rural patients than in urban patients (158.5 ± 23.8 mmHg vs. 146.4 ± 17.5 mmHg and 90.3 ± 12.9 mmHg vs. 85.9 ± 10.1 mmHg, respectively; p < 0.001). The rates of stage 2 and above hypertension in the ischemic stroke population were 32.5 and 18.7%, and was significantly higher in rural areas than in urban areas. Conclusions The prevalence of poorly-controlled hypertension and the high rates of blood pressures at stages 2 and above in patients with prior ischemic stroke demonstrated an alarming situation in northeast China.


2021 ◽  
Vol 26 (3) ◽  
pp. 485-490
Author(s):  
Yan Wang ◽  
Zhisheng Wu

Background & Objective: Stroke-associated pneumonia (SAP) is a common complication of ischemic stroke, increasing the length of hospital stay and costs, and affecting prognosis. This study aimed to determine the incidence of SAP, investigate the risk factors that lead to SAP to facilitate a more targeted response to the prevention of SAP. Methods: A retrospective study was performed to analyze the factors that predict SAP in an acute stroke population from a university affiliated hospital in Fujian, China. A SAP risk score table was constructed. Results: A total of 1,016 patients with acute cerebral infarction were enrolled. The incidence of SAP was 13.58%. Multivariate regression analysis found that age, NIHSS, GCS scores, dysphagia, heart failure, creatinine, and proton pump inhibitors (PPIs) use were independently associated with SAP. Based on the data, a SAP risk score table was constructed with age > 75 years -2 points, NIHSS ≥ 16 -2 points, GCS score ≤ 8 -1.5 points, dysphagia - 5 points, heart failure - 1.5 points, creatinine - 1 point, PPIs use - 1.5 points, a total of 14.5 points. The optimal value was 3 points. Conclusions: Age, NIHSS, GCS score, dysphagia, heart failure, creatinine, and PPIs use were predictive of SAP.


BMC Neurology ◽  
2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Katinka Nordheim Alme ◽  
Torunn Askim ◽  
Jörg Assmus ◽  
Tom Eirik Mollnes ◽  
Mala Naik ◽  
...  

Abstract Background Sedentary behaviour is associated with disease, but the molecular mechanisms are not understood. Valid biomarkers with predictive and explanatory properties are required. Therefore, we have investigated traditional and novel biomarkers of inflammation and immune modulation and their association to objectively measured sedentary behaviour in an ischemic stroke population. Methods Patients admitted to hospital with acute ischemic stroke were included in the multicentre Norwegian Cognitive Impairment After Stroke (Nor-COAST) study (n = 815). For this sub-study (n = 257), sedentary behaviour was registered 3 months after stroke using position transition data from the body-worn sensor, ActivPal®. Blood samples were analysed for high sensitive C-reactive protein (hsCRP), the cytokines interleukin-6 (IL-6) and 10 (IL-10), neopterin, tryptophan (Trp), kynurenine (kyn), kynurenic acid (KA), and three B6 vitamers, pyridoxal 5′-phosphate (PLP), pyridoxal (PL), and pyridoxic acid (PA). The kynurenine/tryptophan ratio (KTR) and the pyridoxic acid ratio index (PAr = PA: PL + PLP) were calculated. Results Of the 815 patients included in the main study, 700 attended the three-month follow-up, and 257 fulfilled the inclusion criteria for this study. Sedentary time was significantly associated with levels of hsCRP, IL-6, neopterin, PAr-index, and KA adjusted for age, sex, waist circumference, and creatinine. In a fully adjusted model including all the significant biomarkers except hsCRP (because of missing values), sedentary time was independently positively associated with the PAr-index and negatively with KA. We did not find an association between sedentary behaviour, IL-10, and KTR. Conclusions The PAr-index is known to capture several modes of inflammation and has previously shown predictive abilities for future stroke. This novel result indicates that the PAr-index could be a useful biomarker in future studies on sedentary behaviour and disease progression. KA is an important modulator of inflammation, and this finding opens new and exciting pathways to understand the hazards of sedentary behaviour. Trial registration The study was registered at Clinicaltrials.gov (NCT02650531). First posted 08/01/2016.


2021 ◽  
Vol 9 ◽  
Author(s):  
Li-Fan Liu ◽  
Wei-Ming Wang ◽  
Jung-Der Wang

Aim: Stroke is a leading cause of disability; however, little is known about the outcomes of the utilization of long-term care (LTC) recipients in Taiwan. This study aimed to quantify the burdens of disease of stroke survivors receiving LTC by evaluating the outcomes of their utilization including mortality, readmissions, and re-emergency within 1 year after diagnoses of strokes.Methods: By interlinkages among the national mortality registry, LTC dataset (LTC-CM), and the National Health Insurance Research Dataset (NHIRD), the outcomes and the factors associated with receiving LTC up to 1 year were explored. Patients were aged 50 years and over with an inpatient claim of the first diagnosis of stroke of intracerebral hemorrhage (ICH) and ischemic stroke during 2011–2016. Outcomes of the healthcare utilization include rehospitalization and re-emergency.Results: There were 15,662 patients with stroke who utilized the LTC services in the dataset among the stroke population in NHIRD. Stroke survivors receiving LTC showed no difference in clinical characteristics and their expected years of life loss (EYLL = 7.4 years) among those encountered in NHIRD. The LTC recipients showed high possibilities to be rehospitalized and resent to emergency service within 1 year after diagnosis. Apart from the comorbidity and stroke severity, both the physical and mental functional disabilities and caregiving resources predicted the outcomes of the utilization.Conclusions: For stroke survivors, both severe functional impairments and cognitive impairments were found as important factors for healthcare utilizations. These results regarding reserving functional abilities deserve our consideration in making the decision on the ongoing LTC policy reform in the aged society of Taiwan.


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