This protocol outlines a reproducible method for conducting a meta-analysis of predominantly East Asian studies to evaluate the efficacy of early rehabilitation interventions on neurological recovery in patients with acute cerebral infarction.
Method Article
* These authors contributed equally
This protocol outlines a reproducible method for conducting a meta-analysis of predominantly East Asian studies to evaluate the efficacy of early rehabilitation interventions on neurological recovery in patients with acute cerebral infarction.
Acute cerebral infarction causes substantial neurological disability, and the efficacy of early rehabilitation-based interventions remains uncertain. This meta-analysis evaluated their effects on neurological recovery. PubMed, Cochrane Library, Embase, Web of Science, and China National Knowledge Infrastructure were searched for randomized controlled trials comparing early rehabilitation-based interventions with standard care. Random-effects models with restricted maximum likelihood and Hartung-Knapp adjustment were applied, and risk of bias was assessed using the Cochrane Risk of Bias 2 tool. Eight randomized controlled trials (RCTs) involving 711 patients were included in the primary analysis after exclusion of one non-RCT evaluating pharmacological reperfusion therapy without a rehabilitation component. Early rehabilitation showed a non-significant trend toward improved National Institutes of Health Stroke Scale scores (SMD: -2.75; 95% CI: -5.94 to 0.45; I2 = 95.5%; τ2 = 3.84), with a wide 95% prediction interval (-9.74 to 4.25). Cognitive outcomes also showed a non-significant trend favoring intervention (SMD: -0.89; 95% CI: -1.87 to 0.09). Although early rehabilitation may support neurological recovery, marked clinical heterogeneity, selective reporting concerns, and the predominantly East Asian evidence base limit confidence and generalizability. Larger, methodologically rigorous trials with standardized intervention reporting are needed.
Acute cerebral infarction, commonly known as ischemic stroke, represents a significant global health challenge, accounting for approximately 87% of all stroke cases worldwide1. This condition occurs when blood flow to a specific region of the brain is obstructed, leading to rapid neuronal death and potentially severe neurological deficits2. With an estimated 13.7 million new stroke cases occurring annually, the burden on public health and socioeconomic structures is substantial3.
Over the past few decades, the management of acute cerebral infarction has undergone considerable evolution, shifting from purely acute medical interventions toward earlier initiation of rehabilitation4. Traditionally, rehabilitation efforts were often delayed for days or weeks following the initial event, based on the assumption that the brain required a period of rest5. However, advances in the understanding of neuroplasticity have demonstrated that the brain possesses a remarkable capacity for reorganization and adaptation, including during the acute stages following injury6. Meta-analyses of animal models have confirmed that task-specific training initiated early after experimental stroke enhances functional recovery through synaptogenesis and dendritic remodelling7.
The concept of early rehabilitation intervention has emerged as a promising approach in the management of acute cerebral infarction. As used in this meta-analysis, ‘early rehabilitation’ is operationally defined as the initiation of any rehabilitation-based therapeutic program within approximately 72 h (3 days) of stroke symptom onset; a subset of studies used an ‘ultra-early’ window of <24 h. Readers should note, however, that the included studies varied in how precisely this window was defined and reported8. Early rehabilitation encompasses a diverse range of interventions, including physical therapy, occupational therapy, speech and language therapy, electroacupuncture, and cognitive rehabilitation exercises9. The underlying principle is to capitalize on the brain’s heightened plasticity during the acute phase of injury, potentially enhancing neurological recovery and improving long-term functional outcomes10.
In this study, ‘neurological function’ primarily refers to clinical measures of stroke severity as assessed by the National Institutes of Health Stroke Scale (NIHSS) and cognition as measured by standardized cognitive function tests. The NIHSS evaluates components such as level of consciousness, eye movement, visual fields, limb strength, sensory function, and language, whereas cognitive tests may include domains such as orientation, memory, and executive function. This comprehensive operationalization helps to characterize the multifaceted nature of stroke recovery.
The potential benefits of early rehabilitation intervention are multifaceted. From a neurophysiological perspective, early mobilization and targeted exercises may mitigate the detrimental effects of prolonged immobility, such as muscle atrophy and cardiopulmonary deconditioning, as demonstrated in the European Stroke Organisation consensus guidelines11. Additionally, early engagement in rehabilitation activities may prevent learned non-use of affected limbs, a phenomenon that has been operationalized and studied using the Delphi methodology and that can impede long-term recovery12. From a psychological standpoint, early rehabilitation may play a role in maintaining patient motivation and preventing post-stroke depression and anxiety, which have been shown to affect recovery trajectories significantly13.
Despite the theoretical promise, empirical evidence supporting the efficacy of early rehabilitation has been mixed. Several studies have reported improvements in neurological function and functional independence among patients receiving early rehabilitation compared with those receiving standard care14,15. Conversely, other investigations have failed to demonstrate a substantial advantage of early intervention over traditional rehabilitation timelines16,17. These inconsistencies may be attributed to heterogeneity in study designs, differences in the timing and intensity of rehabilitation protocols, variations in outcome measures, and the inherent complexity of stroke recovery.
Despite numerous previous review articles on this subject, the present meta-analysis differs by employing robust statistical methods that are specifically suited to evidence-based research characterized by few studies and high heterogeneity. Specifically, this analysis uses restricted maximum likelihood (REML) estimation, which provides less biased variance estimates than the conventional DerSimonian-Laird (DL) method when the number of studies is small18. In addition, the Hartung-Knapp (HK) adjustment is applied to confidence intervals (CIs), which accounts for uncertainty in the heterogeneity estimate and produces wider, more conservative intervals than the standard Wald-type approach19. These methodological choices are particularly important for the current evidence base, where high between-study variability is anticipated due to diverse intervention types and populations. Furthermore, prediction intervals are reported to express the expected range of true effects in future studies, an output not routinely provided in conventional meta-analyses but essential for clinical decision-making18. The analysis also incorporates data from both English and Chinese literature, systematically investigates heterogeneity sources using multiple analytical approaches, and explicitly addresses limitations arising from the geographic concentration of the evidence.
A key limitation that readers should be aware of from the outset is that the included studies span a heterogeneous set of interventions—ranging from motor rehabilitation alone to combined pharmacological-rehabilitation programs and electroacupuncture—which creates important challenges for pooling and interpretation. The present analysis, therefore, emphasizes characterizing heterogeneity as much as estimating a single pooled effect.
In light of these considerations, this meta-analysis was conducted with the primary aim of evaluating the impact of early rehabilitation-based interventions on neurological function recovery in patients with acute cerebral infarction, employing contemporary statistical methods to account for heterogeneity appropriately and provide clinically meaningful estimates of uncertainty.
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This study is not subject to ethical review and participant consent.
1. Literature search strategy
2. Study screening and selection
3. Data extraction
4. Quality assessment
5. Statistical analysis
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The comprehensive literature search initially identified 528 potentially relevant records across the five databases: PubMed (n = 74), Cochrane Library (n = 57), Embase (n = 12), Web of Science (n = 20), and CNKI (n = 365). After removing duplicates, 274 unique records remained for screening. Following title and abstract review, 186 records were excluded for not meeting initial screening criteria. Of the remaining 88 records screened at the abstract level, 69 were excluded for various reasons, including inappropriate stud...
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This meta-analysis evaluated the efficacy of early rehabilitation-based interventions on neurological function recovery in patients with acute cerebral infarction. The comprehensive analysis of 8 RCTs (primary synthesis) encompassing 711 participants provides important insights into both the potential benefits and the substantial challenges in synthesizing evidence in this field. The primary analysis using REML estimation with HK adjustment revealed a trend toward improvement in NIHSS scores with early rehabilitation-bas...
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The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
| Name | Company | Catalog Number | Comments |
|---|---|---|---|
| CNKI | Tsinghua Univ./CNKI | https://www.cnki.net/ | |
| Cochrane Library | Cochrane Collaboration | https://www.cochranelibrary.com/ | |
| Cochrane RoB 2 tool | Cochrane Collaboration | https://www.riskofbias.info/ | |
| Covidence | Veritas Health Innovation | https://www.covidence.org/ | |
| Embase | Elsevier | https://www.embase.com/ | |
| Google Scholar | Google LLC | https://scholar.google.com/ | |
| meta R package | CRAN | https://cran.r-project.org/package=meta | |
| metafor R package | CRAN | https://cran.r-project.org/package=metafor | |
| Microsoft Excel | Microsoft Corporation | https://www.microsoft.com/excel | |
| PubMed/MEDLINE | National Library of Medicine | https://pubmed.ncbi.nlm.nih.gov/ | |
| R software (version 4.3.1+) | R Foundation | https://www.r-project.org/ | |
| robvis R package | CRAN | https://cran.r-project.org/package=robvis | |
| Web of Science | Clarivate Analytics | https://www.webofscience.com/ |
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