ACNS Guideline

Legatt, Alan D.; Emerson, Ronald G.; Epstein, Charles M.; MacDonald, David B.; Deletis, Vedran; Bravo, Ricardo; López, Jaime

doi:10.1097/wnp.0000000000000253

Cited by 123 publications

(84 citation statements)

References 36 publications

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“…Furthermore, some studies (Jeffery et al, 2007; Tanaka et al, 2011; Suzuki et al, 2012) used the TMS-motor evoked potential technique to locate the motor “hotspot” in leg muscle (i.e., vastus lateralis) before positioning tDCS electrodes over the subject’s scalp; unfortunately, we were not able to do so. Although C3/C4 electrode montage is acknowledged as adequate for eliciting modulation in lower limbs (Legatt et al, 2016), the low focality of tDCS stimulus induced by bihemispheric electrode montage to leg muscles may have attenuated the effects of tDCS on PT in both stroke and healthy groups. Secondly, Tanaka et al (2011) assessed the force production using maximal isometric knee extension performed for 3 s, while in the present study three dynamic repetitions involving both extension and flexion of the quadriceps were applied.…”

Section: Discussionmentioning

confidence: 99%

“…This electrode montage (i.e., C3/C4) has been previously applied by studies using TMS to elicit motor evoked potential in both upper and lower limbs, as described elsewhere (Legatt et al, 2016). In order to blind participants to the experimental conditions, 30 s of tDCS were applied at the start of sham stimulation, in order to induce a slight itching sensation (Gandiga et al, 2006).…”

Section: Methodsmentioning

confidence: 99%

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Bihemispheric Motor Cortex Transcranial Direct Current Stimulation Improves Force Steadiness in Post-Stroke Hemiparetic Patients: A Randomized Crossover Controlled Trial

Montenegro

Midgley

Massaferri

et al. 2016

Front. Hum. Neurosci.

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Post-stroke patients usually exhibit reduced peak muscular torque (PT) and/or force steadiness during submaximal exercise. Brain stimulation techniques have been proposed to improve neural plasticity and help to restore motor performance in post-stroke patients. The present study compared the effects of bihemispheric motor cortex transcranial direct current stimulation (tDCS) on PT and force steadiness during maximal and submaximal resistance exercise performed by post-stroke patients vs. healthy controls. A double-blind randomized crossover controlled trial (identification number: TCTR20151112001; URL: http://www.clinicaltrials.in.th/) was conducted involving nine healthy and 10 post-stroke hemiparetic individuals who received either tDCS (2 mA) or sham stimulus upon the motor cortex for 20 min. PT and force steadiness (reflected by the coefficient of variation (CV) of muscular torque) were assessed during unilateral knee extension and flexion at maximal and submaximal workloads (1 set of 3 repetitions at 100% PT and 2 sets of 10 repetitions at 50% PT, respectively). No significant change in PT was observed in post-stroke and healthy subjects. Force steadiness during knee extension (~25–35%, P < 0.001) and flexion (~22–33%, P < 0.001) improved after tDCS compared to the sham condition in post-stroke patients, but improved only during knee extension (~13–27%, P < 0.001) in healthy controls. These results suggest that tDCS may improve force steadiness, but not PT in post-stroke hemiparetic patients, which might be relevant in the context of motor rehabilitation programs.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Bihemispheric Motor Cortex Transcranial Direct Current Stimulation Improves Force Steadiness in Post-Stroke Hemiparetic Patients: A Randomized Crossover Controlled Trial

Montenegro

Midgley

Massaferri

et al. 2016

Front. Hum. Neurosci.

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“…However, to the best of our knowledge, this case report is the first to observe a side-dependent different mechanism resulting in motor weakness as a result of asymmetrical hydrocephalic ventriculomegaly (mechanical compression at the left hemisphere and vasogenic edema at the right hemisphere). However, this study has some limitations, as follows: (1) The external validity of these observations remains limited because they are based on a single case, larger scale long-term studies are necessary to confirm our hypothesis; (2) As our study was in the subacute phase, long-term follow up is necessary; (3) DTT interpretation is operator-dependent, leading to potential performance bias [11]; and (4) Finally, further clarification via electrophysiological examination of long fiber tracts would have been helpful, but was hindered due to the existing craniotomy defect [22].…”

Section: Discussionmentioning

confidence: 90%

Injury of Corticospinal Tract in a Patient with Subarachnoid Hemorrhage as Determined by Diffusion Tensor Tractography: A Case Report

et al. 2020

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We report diffusion tensor tractography (DTT) of the corticospinal tract (CST) in a patient with paresis of all four limbs following subarachnoid hemorrhage (SAH) with intraventricular hemorrhage (IVH) after the rupture of an anterior communicating artery (ACoA) aneurysm rupture. The 73-year-old female was admitted to our emergency room in a semi-comatose mental state. After coil embolization-an acute SAH treatment-she was transferred to our rehabilitation department with motor weakness development, two weeks after SAH. Upon admission, she was alert but she complained of motor weakness (upper limbs: MRC 3/5, and lower limbs: MRC 1/5). Four weeks after onset, DTT showed that the bilateral CSTs failed to reach the cerebral cortex. The left CST demonstrated a wide spread of fibers within the corona radiata as well as significantly lower tract volume (TV) and higher fractional anisotropy (FA) as well as mean diffusivity (MD) compared to the controls. On the other hand, the right CST shifted to the posterior region at the corona radiata, and MD values of the right CST were significantly higher when compared to the controls. Changes in both CSTs were attributed to vasogenic edema and compression caused by untreated hydrocephalus. We demonstrate in this case, two different pathophysiological entitles, contributing to this patient's motor weakness after SAH.

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“…The alarm criteria used for TcMEP and H-reflex monitoring were an amplitude decrease larger than 75–80% and 90% respectively (Legatt et al, 2016, Leppanen, 2012). …”

Section: Case Reportmentioning

confidence: 99%

Suprasegmental neurophysiological monitoring with H reflex and TcMEP in spinal surgery. Transient loss due to hypotension. A case report

Saponaro-González

Pérez-Lorensu

Rivas-Navas

et al. 2016

Clinical Neurophysiology Practice

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ACNS Guideline

Cited by 123 publications

References 36 publications

Bihemispheric Motor Cortex Transcranial Direct Current Stimulation Improves Force Steadiness in Post-Stroke Hemiparetic Patients: A Randomized Crossover Controlled Trial

Bihemispheric Motor Cortex Transcranial Direct Current Stimulation Improves Force Steadiness in Post-Stroke Hemiparetic Patients: A Randomized Crossover Controlled Trial

Injury of Corticospinal Tract in a Patient with Subarachnoid Hemorrhage as Determined by Diffusion Tensor Tractography: A Case Report

Suprasegmental neurophysiological monitoring with H reflex and TcMEP in spinal surgery. Transient loss due to hypotension. A case report

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