scholarly journals Magnetoencephalographic Source Localization of the Eye Area of the Motor Homunculus

2018 ◽  
Vol 46 (1) ◽  
pp. 108-114
Author(s):  
Richard Wennberg ◽  
Luis Garcia Dominguez ◽  
J. Martin del Campo
Keyword(s):  
Source Localization ◽  
Intractable Epilepsy ◽  
Posterior Wall ◽  
Precentral Gyrus ◽  
Source Imaging ◽  
Spatiotemporal Signal ◽  
Signal Space Separation ◽  
The Right ◽  
Space Separation ◽  
New Onset

AbstractA patient with intractable epilepsy, previous right frontal resection, and active vagus nerve stimulation (VNS) developed new onset quasi-continuous twitching around the left eye. Electroencephalography showed no correlate to the orbicularis oculi twitches apart from myographic potentials at the left supraorbital and anterior frontal electrodes. Magnetoencephalography was performed using spatiotemporal signal space separation to suppress magnetic artifacts associated with the VNS apparatus. Magnetoencephalographic source imaging performed on the data back-averaged from the left supraorbital myographic potentials revealed an intrasulcal cortical generator situated in the posterior wall of the right precentral gyrus representing the eye area of the motor homunculus.

Validation of head movement correction and spatiotemporal signal space separation in magnetoencephalography

2012 ◽  
Vol 123 (11) ◽  
pp. 2180-2191 ◽  
Author(s):  
Jukka Nenonen ◽  
Jussi Nurminen ◽  
Dubravko Kičić ◽  
Rozaliya Bikmullina ◽  
Pantelis Lioumis ◽  
...  
Keyword(s):  
Head Movement ◽  
Signal Space ◽  
Spatiotemporal Signal ◽  
Signal Space Separation ◽  
Movement Correction ◽  
Space Separation

Mitral Re-Repair and Right Coronary Fistula Closure Advantage of Minimally Invasive Approach

2010 ◽  
Vol 5 (6) ◽  
pp. 456-459 ◽  
Author(s):  
Vincenzo Giordano ◽  
Jan G. Grandjean
Keyword(s):  
Mitral Valve ◽  
Right Atrium ◽  
Mild Hypothermia ◽  
Posterior Wall ◽  
Coronary Arteriography ◽  
Coronary Fistula ◽  
Invasive Approach ◽  
Concomitant Procedure ◽  
Echocardiographic Images ◽  
The Right

A 51-year-old man developed severe mitral regurgitation 10 years after previous mitral valve repair; the echocardiographic images showed a remarkable eccentric jet toward posterior wall of left atrium associated with a high degree of pulmonary vein retrograde flow. The coronary arteriography pointed out no pathologic lesions but a coronary fistula from the proximal right coronary to the right atrium. The standard approach was avoided, and a right anterolateral minithoracotomy was chosen, providing an excellent view. Under cardiopulmonary bypass and mild hypothermia, the mitral valve was re-repaired, and a new ring was implanted. After aortic cross-clamp release, the right coronary fistula was closed through the right atrium. The postoperative course was uneventful, and the patient was discharged on the fourth postoperative day. In such a high-risk reintervention and concomitant procedure, we think that this different approach may represent a feasible and reliable alternative.

Reorganization of the Right Arcuate Fasciculus Following Left Arcuate Fasciculus Resection in Children With Intractable Epilepsy

2011 ◽  
Vol 26 (10) ◽  
pp. 1246-1251 ◽  
Author(s):  
Dhruman Goradia ◽  
Harry T. Chugani ◽  
Rajkumar Munian Govindan ◽  
Michael Behen ◽  
Csaba Juhász ◽  
...  
Keyword(s):  
Intractable Epilepsy ◽  
Arcuate Fasciculus ◽  
The Right

scholarly journals Is Lateropulsion Really Related with a Specific Lesion of the Brain?

2021 ◽  
Vol 11 (3) ◽  
pp. 354
Author(s):  
Kyoung Lee ◽  
Sang Yoo ◽  
Eun Ji ◽  
Woo Hwang ◽  
Yeun Yoo ◽  
...  
Keyword(s):  
Right Hemisphere ◽  
Parietal Lobe ◽  
Inferior Frontal Gyrus ◽  
Brain Lesions ◽  
Vertical Posture ◽  
Lesion Volume ◽  
Precentral Gyrus ◽  
Stroke Patients ◽  
The Right ◽  
Right Hemisphere Stroke

Lateropulsion (pusher syndrome) is an important barrier to standing and gait after stroke. Although several studies have attempted to elucidate the relationship between brain lesions and lateropulsion, the effects of specific brain lesions on the development of lateropulsion remain unclear. Thus, the present study investigated the effects of stroke lesion location and size on lateropulsion in right hemisphere stroke patients. The present retrospective cross-sectional observational study assessed 50 right hemisphere stroke patients. Lateropulsion was diagnosed and evaluated using the Scale for Contraversive Pushing (SCP). Voxel-based lesion symptom mapping (VLSM) analysis with 3T-MRI was used to identify the culprit lesion for SCP. We also performed VLSM controlling for lesion volume as a nuisance covariate, in a multivariate model that also controlled for other factors contributing to pusher behavior. VLSM, combined with statistical non-parametric mapping (SnPM), identified the specific region with SCP. Lesion size was associated with lateropulsion. The precentral gyrus, postcentral gyrus, inferior frontal gyrus, insula and subgyral parietal lobe of the right hemisphere seemed to be associated with the lateropulsion; however, after adjusting for lesion volume as a nuisance covariate, no lesion areas were associated with the SCP scores. The size of the right hemisphere lesion was the only factor most strongly associated with lateropulsion in patients with stroke. These results may be useful for planning rehabilitation strategies of restoring vertical posture and understanding the pathophysiology of lateropulsion in stroke patients.

A rare encounter of obstructed direct inguinal hernia

2019 ◽  
Vol 22 (2) ◽  
pp. 41-43
Author(s):  
Amit Kumar Singh ◽  
Nripesh Rajbhandari ◽  
Balaram Malla ◽  
Gakul Bhatta
Keyword(s):  
Emergency Department ◽  
Inguinal Hernia ◽  
Intestinal Obstruction ◽  
Intestinal Resection ◽  
Posterior Wall ◽  
Acute Intestinal Obstruction ◽  
University Hospital ◽  
Direct Inguinal Hernia ◽  
Direct Hernia ◽  
The Right

The direct inguinal hernia has a wider neck and thus usually doesn’t present as strangulation or incarceration in comparison to the indirect component. When direct inguinal hernias are untreated for a longer duration, they may get strangulated and incarcerated. Hence such long-standing direct hernias with features of intestinal obstruction and /or peritonism should be promptly seen and diagnosed to prevent massive and unwanted intestinal resection. We are reporting a case of 83-year-old male presented to Surgical Emergency Department of Dhulikhel Hospital, Kathmandu University hospital with complaints of swelling in the right inguinoscrotal region for 12 years and progressed to become irreducible and painful for 12 hours. Clinically he had an acute intestinal obstruction. Intra-operatively we found a direct hernia containing congested small bowel loops and toxic fluids. The toxic fluid was suctioned and after confirming viability, modified Bassini’s repair was done with reinforcement of the posterior wall. Even direct inguinal hernia of longer duration can cause acute or sub-acute intestinal obstruction with or without features of peritonism. This complication is more common in elderly patients.

Effects of the SNAP25 on Integration Ability of Brain Functions in Children With ADHD

2020 ◽  
pp. 108705472096456
Author(s):  
Yue Yang ◽  
Gang Peng ◽  
Hongwu Zeng ◽  
Diangang Fang ◽  
Linlin Zhang ◽  
...  
Keyword(s):  
Time Window ◽  
Precentral Gyrus ◽  
Children With Adhd ◽  
Brain Functions ◽  
Lingual Gyrus ◽  
Window Method ◽  
Central Gyrus ◽  
The Right ◽  
The Brain ◽  
Insight Into

Objective: The present study aimed to examine the effects of SNAP25 on the integration ability of intrinsic brain functions in children with ADHD, and whether the integration ability was associated with working memory (WM). Methods: A sliding time window method was used to calculate the spatial and temporal concordance among five rs-fMRI regional indices in 55 children with ADHD and 20 healthy controls. Results: The SNAP25 exhibited significant interaction effects with ADHD diagnosis on the voxel-wise concordance in the right posterior central gyrus, fusiform gyrus and lingual gyrus. Specifically, for children with ADHD, G-carriers showed increased voxel-wise concordance in comparison to TT homozygotes in the right precentral gyrus, superior frontal gyrus, postcentral gyrus, and middle frontal gyrus. The voxel-wise concordance was also found to be related to WM. Conclusion: Our findings provided a new insight into the neural mechanisms of the brain function of ADHD children.

scholarly journals Utility of temporally-extended signal space separation algorithm for magnetic noise from vagal nerve stimulators

2013 ◽  
Vol 124 (7) ◽  
pp. 1277-1282 ◽  
Author(s):  
Yosuke Kakisaka ◽  
John C. Mosher ◽  
Zhong I. Wang ◽  
Kazutaka Jin ◽  
Anne-Sophie Dubarry ◽  
...  
Keyword(s):  
Vagal Nerve ◽  
Magnetic Noise ◽  
Separation Algorithm ◽  
Signal Space ◽  
Signal Space Separation ◽  
Space Separation

scholarly journals Magnetic source imaging for the surgical evaluation of electroencephalography-confirmed secondary bilateral synchrony in intractable epilepsy

2009 ◽  
Vol 111 (6) ◽  
pp. 1248-1256 ◽  
Author(s):  
Edward F. Chang ◽  
Srikantan S. Nagarajan ◽  
Mary Mantle ◽  
Nicholas M. Barbaro ◽  
Heidi E. Kirsch
Keyword(s):  
Mr Imaging ◽  
Intractable Epilepsy ◽  
Focal Lesion ◽  
Seizure Type ◽  
Source Imaging ◽  
Magnetic Source Imaging ◽  
Ms Imaging ◽  
Epileptiform Discharges ◽  
Magnetic Source ◽  
Imaging Results

Object Routine scalp electroencephalography (EEG) cannot always distinguish whether generalized epileptiform discharges are the result of primary bilateral synchrony or secondary bilateral synchrony (SBS) from a focal origin; this is an important distinction because the latter may be amenable to resection. Whole-head magnetoencephalography (MEG) has superior spatial resolution compared with traditional EEG, and can potentially elucidate seizure foci in challenging epilepsy cases in which patients are undergoing evaluation for surgery. Methods Sixteen patients with medically intractable epilepsy in whom SBS was suspected were referred for magnetic source (MS) imaging. All patients had bilateral, synchronous, widespread, and most often generalized spike-wave discharges on scalp EEG studies, plus some other clinical (for example, seizure semiology) or MR imaging feature (for example, focal lesion) suggesting focal onset and hence possible surgical candidacy. The MS imaging modality is the combination of whole-head MEG and parametric reconstruction of corresponding electrical brain sources. An MEG and simultaneous EEG studies were recorded with a 275-channel whole-head system. Single-equivalent current dipoles were estimated from the MEG data, and dipole locations and orientations were superimposed on patients' MR images. Results The MS imaging studies revealed focal dipole clusters in 12 (75%) of the 16 patients, of which a single dipole cluster was identified in 7 patients (44%). Patient age, seizure type, duration of disease, video-EEG telemetry, and MR imaging results were analyzed to determine factors predictive of having clusters revealed on MS imaging. Of these factors, only focal MR imaging anatomical abnormalities were associated with dipole clusters (chi-square test, p = 0.03). Selective resections (including the dipole cluster) in 7 (87%) of 8 patients resulted in seizure-free or rare seizure outcomes (Engel Classes I and II). Conclusions Magnetic source imaging may provide noninvasive anatomical and neurophysiological confirmation of localization in patients in whom there is a suspicion of SBS (based on clinical or MR imaging data), especially in those with an anatomical lesion. Identification of a focal seizure origin has significant implications for both resective and nonresective treatment of intractable epilepsy.

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