Delta Power Is Higher and More Symmetrical in Ischemic Stroke Patients with Cortical Involvement

  title={Delta Power Is Higher and More Symmetrical in Ischemic Stroke Patients with Cortical Involvement},
  author={Chiara Fanciullacci and Federica Bertolucci and Giuseppe Lamola and Alessandro Panarese and Fiorenzo Artoni and Silvestro Micera and Bruno Rossi and Carmelo Chisari},
  journal={Frontiers in Human Neuroscience},
A brain injury resulting from unilateral stroke critically alters brain functionality and the complex balance within the cortical activity. Such modifications may critically depend on lesion location and cortical involvement. Indeed, recent findings pointed out the necessity of applying a stratification based on lesion location when investigating inter-hemispheric balance in stroke. Here, we tested whether cortical involvement could imply differences in band-specific activity and brain symmetry… 

Figures and Tables from this paper

Connectivity Measures Differentiate Cortical and Subcortical Sub-Acute Ischemic Stroke Patients

Connectivity measures and correlations between EEG features and recovery depend on lesion location, which could explain the heterogeneity of results so far observed in previous studies and could be used by researchers as biomarkers predicting spontaneous recovery.

Low-Frequency Oscillations Are a Biomarker of Injury and Recovery After Stroke

Delta band coherence with iM1 related to greater injury and poorer motor status subacutely, while delta band power related to more injury and better motor status chronically, which may be useful biomarkers in stroke recovery and rehabilitation.

Simultaneously stimulating both brain hemispheres by rTMS in patients with unilateral brain lesions decreases interhemispheric asymmetry.

When both brain hemispheres were simultaneously activated, rTMS decreased interhemispheric asymmetry primarily via reducing the delta band in the lesioned hemisphere.

Simultaneously stimulating both brain hemispheres by rTMS in patients with unilateral brain lesions decreases interhemispheric asymmetry

When both brain hemispheres are activated simultaneously, rTMS decreases interhemispheric asymmetry primarily through reducing the delta wave in the lesioned hemisphere.

Quantitative Evaluation of Task-Induced Neurological Outcome after Stroke

Electroencephalography data showed that alpha, theta, and delta activities are biomarkers classifying the stroke patients and the healthy adults in the motor and cognitive states, and the C5.0 model showed 78% accuracy for the resting state, 89% accuracy in the functional motor walking condition, 84% Accuracy in the working condition, and 85% accuracy on the cognitive reading state for classification the stroke group and the control group.

Acute Phase Neuronal Activity for the Prognosis of Stroke Recovery

Present data strengthen the fact that low-band impairment of homologous ipsi- and contralesional hemispheric regions in the acute stroke indicate a negative prognosis of clinical recovery.

Power spectrum slope and motor function recovery after focal cerebral ischemia in the rat

Spectrum slope was significantly correlated with post-stroke motor function and local EEG changes in NREM, REM and wakefulness during a 30-day recovery period after middle cerebral artery occlusion (MCAO) or sham surgery in rats.

Is Resting-State EEG Longitudinally Associated With Recovery of Clinical Neurological Impairments Early Poststroke? A Prospective Cohort Study

The present study suggests that decreasing DARAH and BS Idirdelta reflect improvement of global neurological impairments, whereas BSIdirdelta was also specifically associated with upper-limb motor recovery early poststroke.

EEG spectral exponent as a synthetic index for the longitudinal assessment of stroke recovery

Intrahemispheric EEG: A New Perspective for Quantitative EEG Assessment in Poststroke Individuals

A new perspective for analyzing DAR and PRI within each hemisphere and investigated the motor impairment-related interhemispheric frequency oscillations showed a slowing in brain activity in poststroke patients when compared to healthy controls.



Lesion location alters brain activation in chronically impaired stroke survivors

Spectral EEG analysis following hemispheric stroke

Electro EEG signs of diaschisis may anticipate a poor recovery of alpha activity and clinical status in the post‐stroke period, suggesting transitory derangement of alpha generators in the contralateral hemisphere evidenced by APF and power asymmetries.

Brain Symmetry Index in Healthy and Stroke Patients for Assessment and Prognosis

Brain symmetry index is increased in the subacute poststroke phase and correlates with motor function 1-2 months after stroke and statistically significant correlation was observed between early BSI and Fugl–Meyer score later in recovery.

A contralesional EEG power increase mediated by interhemispheric disconnection provides negative prognosis in acute stroke.

Contralesional EEG delta activity retains relevant negative prognostic information in acute stroke patients, and results point to the interhemispheric interplay as a decisive target in setting up enriched rehabilitations.

Continuous Quantitative EEG Monitoring in Hemispheric Stroke Patients Using the Brain Symmetry Index

The BSI correlates satisfactorily with the clinical neurological condition of stroke patients, which suggests that the BSI can be used as a measure to monitor possible changes of brain function in patients with acute ischemic hemispheric stroke.

Reorganization of cerebral networks after stroke: new insights from neuroimaging with connectivity approaches

Analysis of connectivity further the understanding of the pathophysiology underlying motor symptoms after stroke, and may help to design hypothesis-driven treatment strategies to promote recovery of motor function in patients.

Stages of Motor Output Reorganization after Hemispheric Stroke Suggested by Longitudinal Studies of Cortical Physiology

Improved performance at 3 months may depend on reorganization in alternative cortical networks to maximize the efficiency of remaining corticospinal pathways—intracortical disinhibition may aid recovery by promoting access to these networks.

Stroke subtype and motor impairment influence contralesional excitability

It is shown that the impact on M1NL depends on lesion location and concluded that protocols aimed at reducing M 1NL cortical excitability may be worth exploring for subcortical but not for cortical stroke.

Resting state alpha-band functional connectivity and recovery after stroke