Functional magnetic resonance imaging (fMRI) is a widely used technique for assessing brain function in both healthy and pathological populations. Some factors, such as motion, physiological noise and lesion presence, can contribute to signal change and confound the fMRI data, but fMRI data processing techniques have been developed to correct for these confounding effects. Fifteen spastic subacute stroke patients underwent fMRI while performing a highly controlled task (i.e. passive extension of their affected and unaffected wrists). We investigated the impact on activation maps of lesion masking during preprocessing and first- and second-level analyses, and of adding wrist extension amplitudes and physiological data as regressors using the Statistical Parametric Mapping toolbox (SPM12).

Background: Individuals with poststroke hemiplegia often develop spasticity, which increases disability. Antispastic treatments such as baclofen and botulinum toxin are commonly prescribed in poststroke recovery. However, their impact on motor recovery, especially when administered within the first 2 months after stroke, remains unclear. Objective: This study aims to compare the motor recovery effects of botulinum toxin versus oral baclofen. The hypothesis is that botulinum toxin is more supportive of motor recovery than baclofen and enhances functional recovery. Methods: The study is a multicenter, controlled phase IV, comparative, prospective, randomized, double-blind, double-dummy, superiority trial to compare the toxin and baclofen, and a noninferiority trial to compare the toxin and the placebo. It focuses on the time course of the Fugl-Meyer Motor Assessment (FMA) as the primary outcome. The main inclusion criterion is patients with a single stroke in the past 2 months. Treatment comprises 1 intramuscular injection at treatment initiation and oral tablets for 4 months. Randomized patients are allocated to 3 arms: botulinum toxin with placebo baclofen, baclofen with placebo botulinum toxin, and placebo baclofen with placebo botulinum toxin. FMA scores are assessed at pretreatment, 1 month, and 3 months later. Spasticity, functional abilities, activities of daily living, pain, and quality of life are also evaluated. Adverse effects are monitored. A positive difference of 13 points in the FMA time course between the botulinum toxin and baclofen groups is considered a relevant effect. The data analysis plan involves linear regression models to compare primary and secondary outcomes, with adjustments for covariates such as age, center, and associated treatments. Subgroup analyses will examine proportional recovery profiles, and missing data in Fugl-Meyer scores will be addressed using imputation methods. Results: A total of 179 participants were randomized across 18 centers, with inclusions delayed due to the COVID-19 pandemic. As of December 2024, the data manager currently has all the data, and a review of data quality is in progress. No statistical analysis has been conducted so far, and the blind will be lifted after the analysis. Conclusions: This study identifies the most suitable spasticity treatment, considering the specificities of the stroke and constraints during the recovery phase. It will provide recommendations for the primary treatment of early spasticity post stroke. Trial Registration: ClinicalTrials.gov NCT02462317; https://clinicaltrials.gov/study/NCT02462317; European clinical trials (EudraCT) 2010-022881-28; https://www.clinicaltrialsregister.eu/ctr-search/trial/2010-022881-28/FR International Registered Report Identifier (IRRID): DERR1-10.2196/62951

The results of this pilot study show the effects of a therapeutically promising 15 Hz repetitive transcranial magnetic stimulation (rTMS) protocol, administered at different suprathreshold intensities in able-bodied individuals. Although tolerable and feasible with a neuromodulatory potential, 15 Hz rTMS might result in persistent excitability that needs to be closely monitored if administered at suprathreshold stimulation intensity. These results reaffirm the importance of feasibility studies, especially in translational animal-to-human research.

Spinal cord injury (SCI) disrupts the communication between the brain and the rest of the body, triggering widespread spinal and supraspinal changes resulting in a cascade of functional impairments. MRI has proved useful to investigate neural circuits reorganization, offering insights into the neuroplastic changes underlying specific impairments and deficits. However, it remains unclear whether different impairments are associated with differential patterns of structural and functional brain reorganization, a knowledge gap addressed in this study. Anatomical and resting-state functional MRI data from 12 participants with complete and incomplete chronic cervical SCI and 12 age- and sex-matched able-bodied individuals were acquired. SCI participants’ arm and hand sensory and motor functions were assessed using the Graded Redefined Assessment of Strength Sensibility and Prehension scale. Cortical thickness, gray matter volume and resting-state functional connectivity (rs-FC) were measured and compared between groups while also considering changes in clinical scores in SCI. Widespread structural and functional changes in various cortical and subcortical regions were highlighted in individuals with chronic cervical SCI as compared to the able-bodied controls. Specific alterations were seen in cortical thickness, gray matter volume and rs-FC of the sensorimotor, and visuospatial processing networks. Mainly rs-FC of sensorimotor cortical and subcortical areas showed changes differentially associated to only-motor versus sensory deficits in the SCI group. Motor and sensory impairments at the chronic stage appears associated with differential patterns of brain reorganization in individuals with chronic cervical SCI, prominently involving regions of the visual and visuospatial networks. Some of the regions with altered rs-FC, notably the thalamus and putamen, showed also changes in their anatomy in SCI. The findings confirm the value of multimodal brain MRI for characterizing neural correlates of specific impairments following SCI and informing personalized therapeutic strategies. Our results support the consideration of interventions that engage visual and visuospatial networks to promote function recovery after SCI.

Paired associative stimulation (PAS) is an intervention that modulates cortical plasticity. Motor imagery (MI) is used in the rehabilitation of stroke patients. We aimed to evaluate the possible synergistic effect of associating both interventions for potentiating motor recovery poststroke. MIPAS is a single-center, randomized controlled trial that enrolled 24 hemiparetic poststroke participants. Three single-session interventions were tested in a crossover design: PAS/MI, PAS, and ShamPAS/MI during which the affected Extensor Carpi Radialis (ECR) muscle was targeted. During MI, the participants were instructed to imagine extending their paretic wrist. We used Sham, subthreshold stimulation during ShamPAS. Changes in ECR Motor-Evoked Potential (MEP) areas and paretic wrist Range of Motion (aROM) during active extension were compared between the interventions. We observed no significant superior effect of any intervention, neither on MEP nor on wrist aROM. A time of assessment effect was highlighted for both outcome measures, with MEP- and aROM-measured post-interventions significantly higher than those measured pre-intervention. Despite the beneficial effect of each intervention on participant paretic wrist motor function, not always associated with MEP change, our results do not highlight a specific advantage in combining PAS and MI interventions in post-stroke motor rehabilitation.