Objective and importance: Recent works on extradural cortical stimulation have been successful in improving neurological recovery in chronic stroke patients. On the other hand, single perirolandic stimulations are often associated with disappointing results.
Clinical presentation: We report two cases of chronic stroke in which the magnitude of infarct was too large to be improved with single perirolandic stimulation. Patient 1 had severe hemiplegia associated with large cortical infarct in the right frontoparietal area. The patient could neither stand independently or walk. Patient 2 had hemiplegia and aphasia due to cortical infarct in the left middle cerebral artery territory. Both patients had intensive rehabilitative training for more than 6 months with no beneficial results.
Intervention: Two paddle electrodes covering frontal and parietal area were implanted, followed by dual cortical stimulation with concurrent rehabilitative training in patient 1. After 6 months of stimulation, the patient could walk with a good posture. Two paddle electrodes were implanted to cover pre-motor and motor cortex in patient 2. After similar treatment, the motor function was markedly improved.
Conclusion: Dual cortex stimulation, which acts on more diffuse areas or functionally related areas, is beneficial to promote the motor recovery in chronic stroke patients with large infarcts.