Heidi Janssen

An Enriched Environment Improves Sensorimotor Function Post-Ischemic Stroke

Objective. An enriched environment (EE) refers to conditions that facilitate or enhance sensory, cognitive, motor, and social stimulation relative to standard (laboratory) conditions. Despite numerous published studies investigating this concept in animal stroke models, there is still debate around its efficacy. The authors performed a systematic review and meta-analysis to determine the efficacy of an EE on neurobehavioral scores, learning, infarct size, and mortality in animal models of ischemic stroke. Methods. Systematic review of controlled studies of the use of an EE in experimental stroke was conducted. Data extracted were analyzed using weighted mean difference meta-analysis. For pooled tests of neurobehavioral scores, a random effects standardized method was used. Results. Animals recovering in an EE poststroke had mean neurobehavioral scores 0.9 standard deviations (95% confidence interval [CI] = 0.5-1.3; P < .001) above the mean scores of animals recovering in standard conditions and showed a trend toward improvement in learning (25.1% improvement; 95% CI = 3.7-46.6; P = .02). There was no significant increase in death. Animals exposed to an EE had 8.0% larger infarcts than control animals (95% CI = 1.8-14.1; P = .015). Conclusions. The results indicate significant improvements in sensorimotor function with EE poststroke but suggest a small increase in infarct volume. Clarification of the underlying mechanisms requires further study but should not overshadow the observed functional improvements and their application to clinical trials during stroke rehabilitation.

An enriched environment increases activity in stroke patients undergoing rehabilitation in a mixed rehabilitation unit: a pilot non-randomized controlled trial

Abstract Purpose: An enriched environment (EE) facilitates physical, cognitive and social activity in animal models of stroke. The aim of this pilot study was to determine whether enriching the environment of a mixed rehabilitation unit increased stroke patient activity. Methods: A non- randomized controlled trial was conducted. Direct observation was used to determine the difference in change in physical, cognitive, social or any activity over 2 weeks in patients exposed to an enriched versus non-enriched environment. Results: Stroke patients in the EE (n = 15) were 1.2 (95% CI 1.0–1.4) times more likely to be engaged in any activity compared with those in a non-enriched environment (n = 14). They were 1.7 (95% CI 1.1–2.5) times more likely to be engaged in cognitive activities, 1.2 (95% CI 1.0–1.5) times more likely to be engaged in social activities, 0.7 (95% CI 0.6–0.9) times as likely to be inactive and alone and 0.5 (95% CI 0.4–0.7) times as likely to be asleep than patients without enrichment. Conclusions: This preliminary trial suggests that the comprehensive model of enrichment developed for use in a rehabilitation unit was effective in increasing activity in stroke patients and reducing time spent inactive and alone. Implications for Rehabilitation Stroke patients within a mixed rehabilitation unit who are exposed to an enriched environment (EE) are more likely to be engaged in activity than those not exposed to the enriched environment. Patients in enriched conditions are less likely to be “inactive and alone” or asleep during waking hours. These results suggest a comprehensive model of enrichment is effective in increasing activity levels.

Physical, cognitive and social activity levels of stroke patients undergoing rehabilitation within a mixed rehabilitation unit

Objective: To determine physical, cognitive and social activity levels of stroke patients undergoing rehabilitation, and whether these changed over time. Design: Observational study using behavioural mapping techniques to record patient activity over 12 hours on one weekday and one weekend day at baseline (week 1) and again two weeks later (week 2). Setting: A 20-bed mixed rehabilitation unit. Subjects: Fourteen stroke patients. Interventions: None. Main measures: Percentage of day spent in any activity or physical, cognitive and social activities. Level of independence using the Functional Independence Measure (FIM) and mood using the Patient Health Questionniare-9 (PHQ-9). Results: The stroke patients performed any activity for 49%, social activity for 32%, physical activity for 23% and cognitive activity for 4% of the day. Two weeks later, physical activity levels had increased by 4% (95% confidence interval (CI) 1 to 8), but levels of any activity or social and cognitive activities had not changed significantly. There was a significant: (i) positive correlation between change in physical activity and change in FIM score (r = 0.80), and (ii) negative correlation between change in social activity and change in PHQ-9 score (r = −0.72). The majority of activity was performed by the bedside (37%), and most physical (47%) and cognitive (54%) activities performed when alone. Patients undertook 5% (95% CI 2 to 9) less physical activity on the weekends compared with the weekdays. Conclusions: Levels of physical, cognitive and social activity of stroke patients were low and remained so even though level of independence and mood improved. These findings suggest the need to explore strategies to stimulate activity within rehabilitation environments.

Exercise Reduces Infarct Volume and Facilitates Neurobehavioral Recovery Results From a Systematic Review and Meta-analysis of Exercise in Experimental Models of Focal Ischemia

Background. Regular exercise reduces the risk of a first-ever stroke and is associated with smaller infarcts. Although evidence has suggested that therapeutic exercise following stroke is beneficial, we do not yet know whether exercise reduces stroke severity and improves functional recovery. The mechanisms underlying any benefit remain unclear. Objective. To conduct a systematic review and meta-analysis of studies testing exercise in animal models of ischemic stroke where outcomes were measured as infarct volume, neurobehavioral score, neurogenesis, or a combination of these. We also sought evidence of publication bias. Methods. We searched 3 online databases for publications reporting the use of exercise in focal cerebral ischemia. We used DerSimonian and Laird normalized random-effects meta-analysis and meta-regression to determine the impact of study quality and design on the efficacy of exercise. Results. Overall, exercise reduced infarct volume by 25.2% (95% confidence interval [CI] = 19.0%-31.3%; 65 experiments and 986 animals) and improved neurobehavioral score by 38.2% (95% CI = 29.1%-47.3%; 42 experiments; n = 771). For both outcomes, larger effects were seen when exercise preceded ischemia rather than came after it. For neurobehavioral scores, we found evidence of publication bias. Reported study quality was moderate (median score 5/10). Both model-specific (eg, type of ischemia) and exercise-specific characteristics influenced reported outcome. Conclusion. Exercise, either before or after ischemia, reduced infarct volume and improved neurobehavioral score. However, overall estimates of efficacy were higher in studies at risk of bias, and for neurobehavioral outcomes, there was evidence of a substantial publication bias.

Translating the Use of An Enriched Environment Poststroke from Bench to Bedside: Study Design and Protocol Used to Test the Feasibility of Environmental Enrichment on Stroke Patients in Rehabilitation:

Rationale Environmental enrichment, a paradigm investigated extensively in animal models, is an intervention, which by design facilitates motor, sensory, social, and cognitive activity. It has been shown to improve poststroke motor and cognitive function in animal models of stroke. This is the first study to attempt to translate this intervention from the laboratory to the clinical setting. Aims The overall aim of this pilot study is to test the feasibility of using environmental enrichment with stroke patients in a rehabilitation setting. The aim is to enrich the environment of stroke survivors in a rehabilitation ward and measure changes in their activity (physical, cognitive, and social activity). Design Prospective nonrandomized block design intervention study. Study In the control phase we will determine the change in activity levels of patients treated in a usual rehabilitation environment over time. In the intervention phase structured observational techniques (behavioural mapping) will be used to quantify the change in activity levels of patients exposed to environmental enrichment. Outcomes The primary outcome is change in activity level. Additional data collected on entry to and exit from the study will include: cognitive function using a battery of cognitive tests, general function using the Functional Independence Measure, mood using the Patient Health Questionnaire 9 and boredom using the Stroke Rehabilitation Boredom Survey. Quality of life will be assessed using the Assessment of Quality of Life 1 month postdischarge from rehabilitation. Australian New Zealand Clinical Trials Registry#*** ACTRN12611000629932.

Tablet technology during stroke recovery: a survivor's perspective.

Abstract Background: Clinician interest in the role of tablet technology in commercially available tablet devices (i.e. iPads) following stroke is rising. Tablets have the potential to encourage engagement in therapeutic activities. We aimed to explore stroke survivor acceptability of and experience of tablet use during the first three months of stroke recovery. Design: A qualitative study using an inductive thematic approach incorporating the process of constant comparison was utilized to collect and analyse data. Setting: Community dwelling stroke survivors in metropolitan Newcastle, New South Wales, Australia. Participants: Twelve stroke survivors (8 male, 4 female; median age of 73 (IQR 58–83) years). Main outcome measures: Qualitative outcomes were participants’ perceptions using in-depth, semi-structured interviews. Results: Participants’ found tablets easy to use and beneficial. Most stroke survivors used the tablet to engage in therapeutic and leisure activities on most days during the three months. Three key themes emerged: (1) Getting established on the iPad: “It just became easier and easier”, (2) Technology as a means for increased stimulation: “Something to keep me interested”, and (3) Personal experiences of access to an iPad: “It’s been very helpful”. Conclusions: Incorporating tablet technology into the delivery of stroke rehabilitation appears to be feasible and acceptable at a patient level. This process has the potential to improve participation in therapeutic and or leisure; however further evaluation towards the impact of tablet technology on patient outcome and quality of life is required. Implications for Rehabilitation The use of tablet technology provides a platform to increase the variety and intensity of stroke therapy, both in the hospital setting and following discharge from hospital, facilitating physical, cognitive and social activity. Stroke survivors experienced increased participation in therapeutic activities, increased socialization and less inactivity and boredom through access to tablet technology. Tablet technology is feasible and acceptable at a patient level, providing preliminary support for the use of interactive computer devices during stroke recovery.

Exploring the Efficacy of Constraint in Animal Models of Stroke: Meta- analysis and Systematic Review of the Current Evidence

Background. Constraint-induced movement therapy (CIMT) is used to counteract learned nonuse observed following stroke in humans and has been shown to improve function. Variations of CIMT used in animal models of stroke have the potential to inform and improve our understanding of this intervention. Objective. To conduct a systematic review of studies investigating constraint in experimental stroke. The authors aimed to assess the quality and establish the efficacy of constraint on neurobehavior, cognitive function, infarct size, and stress and mortality and to determine the optimal dose or time to administration. Methods. Systematic review with meta-analysis was used. Data were analyzed using DerSimonian and Laird weighted-mean-difference random effects meta-analysis. Results. The quality scores of the 8 articles (15 studies) included were moderate (median 5/10; interquartile range, 4.8-6.0). There was a trend for animals with constraint to have worse neurobehavioral scores (−10% worse; 95% confidence interval [CI] = −20 to 0; P = .06). Infarct volumes were not significantly different between groups (−3% larger with constraint; 95% CI = −15 to 9; P = .63). Cognitive function was significantly better after constraint, although this estimate was based on only 28 animals from 2 studies. Insufficient data prevented analysis of the effect of constraint on stress and mortality. Conclusions. This meta-analysis showed no benefit of constraint on neurobehavioral scores, which is at odds with some human studies. Animal models may help us efficiently explore the biological basis of rehabilitation interventions; however, review of the data in this study raise uncertainty about its effectiveness in humans.

Exploring stroke survivor experience of participation in an enriched environment: A qualitative study

Abstract Background: Data highlight the importance of undertaking intense and frequent repetition of activities within stroke rehabilitation to maximise recovery. An enriched environment (EE) provides a medium in which these activities can be performed and enhanced recovery achieved. An EE has been shown to promote neuroplasticity in animal models of stroke, facilitating enhanced recovery of motor and cognitive function. However, the benefit of enriching the environment of stroke survivors remains unknown. Aim: To qualitatively explore stroke survivors’ experience of implementation of exposure to an EE within a typical stroke rehabilitation setting, in order to identify facilitators and barriers to participation. Methods: Semi-structured interviews with 10 stroke survivors (7 females and 3 males, mean age of 70.5 years) exposed to an EE for a 2-week period following exposure to routine rehabilitation within a stroke rehabilitation ward. An inductive thematic approach was utilised to collect and analyse data. Results: Qualitative themes emerged concerning the environmental enrichment paradigm including: (1) “It got me moving” – perceived benefits of participation in an EE; (2) “You can be bored or you can be busy.” – Attenuating factors influencing participation in an EE; (3) “I don’t like to make the staff busier” – limitations to use of the EE. Conclusions: This study provides preliminary support for the implementation of an EE within a typical stroke rehabilitation setting from a patient perspective. Reported benefits included (1) increased motor, cognitive and sensory stimulation, (2) increased social interaction, (3) alleviation of degree of boredom and (4) increased feelings of personal control. However, participants also identified a number of barriers affecting implementation of the EE. We have previously published findings on perceptions of nursing staff working with stroke survivors in this enriched rehabilitation environment who identified that patients benefited from having better access to physical, cognitive and social activities. Together, results contribute to valuable evidence for future implementation of an EE in stroke rehabilitation settings. Implications for Rehabilitation Stroke survivor access to an enriched environment (EE): Results identified that participation in both individual and communal forms of environment enrichment within the stroke rehabilitation ward resulted in increased access to activities providing increased opportunities for enhanced motor, cognitive and sensory stimulation. Increased access to and participation in activities of the environmental enrichment (individual and communal) interrupted the ongoing cycle of boredom and inactivity experienced by many participants. This study provides preliminary support for the implementation of an EE within a typical stroke rehabilitation setting from a patient perspective.

Embedding an enriched environment in an acute stroke unit increases activity in people with stroke: a controlled before–after pilot study:

Objectives: To determine whether an enriched environment embedded in an acute stroke unit could increase activity levels in acute stroke patients and reduce adverse events. Design: Controlled before–after pilot study. Setting: An acute stroke unit in a regional Australian hospital. Participants: Acute stroke patients admitted during (a) initial usual care control period, (b) an enriched environment period and (c) a sustainability period. Intervention: Usual care participants received usual one-on-one allied health intervention and nursing care. The enriched environment participants were provided stimulating resources, communal areas for eating and socializing and daily group activities. Change management strategies were used to implement an enriched environment within existing staffing levels. Main Measures: Behavioural mapping was used to estimate patient activity levels across groups. Participants were observed every 10 minutes between 7.30 am and 7.30 pm within the first 10 days after stroke. Adverse and serious adverse events were recorded using a clinical registry. Results: The enriched environment group (n = 30, mean age 76.7 ± 12.1) spent a significantly higher proportion of their day engaged in ‘any’ activity (71% vs. 58%, P = 0.005) compared to the usual care group (n = 30, mean age 76.0 ± 12.8). They were more active in physical (33% vs. 22%, P < 0.001), social (40% vs. 29%, P = 0.007) and cognitive domains (59% vs. 45%, P = 0.002) and changes were sustained six months post implementation. The enriched group experienced significantly fewer adverse events (0.4 ± 0.7 vs.1.3 ± 1.6, P = 0.001), with no differences found in serious adverse events (0.5 ± 1.6 vs.1.0 ± 2.0, P = 0.309). Conclusions: Embedding an enriched environment in an acute stroke unit increased activity in stroke patients.

Exploring staff experience of an "enriched environment" within stroke rehabilitation: a qualitative sub-study.

Abstract Background: Environmental Enrichment (EE) is shown to facilitate recovery of motor and cognitive function in animal models of stroke. The efficacy of EE in the clinical setting with stroke survivors remains unknown. Successful implementation of EE in a busy rehabilitation unit requires identification of barriers and enablers which are best informed by staff feedback. Aim: To qualitatively explore the experiences of nursing staff involved in a pilot study investigating the feasibility of EE in a rehabilitation ward. Methods: This was a qualitative study consisting of analysis of semi-structured interviews with nine nursing staff who were asked to reflect on “routine care” and their own “experience of the EE study”. An inductive thematic approach was used to collect and analyse data using a process of constant comparison. Results: Male and female staff with varying years of experience working in stroke rehabilitation participated in focus group and individual interviews. Three key themes were identified concerning the implementation of EE including: (i) “Nurses are so busy” – perceptions on routine work practice; (ii) “A better outlook” – perceptions of the benefit of EE; (iii) “They’re just not going to participate” – perceptions of barriers to EE. Indeed, the challenges identified in this study align with practice change literature, which indicates that staff workload, routine and attitudes can influence the implementation of a new practice. Discussion: Staff perceived the use of an EE in their rehabilitation unit promoted activity/participation and increased patient moral. The barriers and enablers experienced by staff in this study may be used to inform the design and conduct of future studies investigating the efficacy of EE during inpatient stroke rehabilitation after stroke. Implications for Rehabilitation Results from animals models suggest that environmental enrichment (EE) is an important paradigm for consideration in stroke rehabilitation. It is concerning that many stroke survivors are inactive during their admission for inpatient stroke rehabilitation. Preliminary results suggest that rehabilitation nurses perceive that EE promoted patient activity/participation. Results highlight the importance of social support and participation in the ward environment and potential benefits for patient’s mood levels.