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https://www.readbyqxmd.com/read/28319479/brainstem-evoked-potential-indices-of-subcortical-auditory-processing-after-mild-traumatic-brain-injury
#1
Kathy R Vander Werff, Brian Rieger
OBJECTIVES: The primary aim of this study was to assess subcortical auditory processing in individuals with chronic symptoms after mild traumatic brain injury (mTBI) by measuring auditory brainstem responses (ABRs) to standard click and complex speech stimuli. Consistent with reports in the literature of auditory problems after mTBI (despite normal-hearing thresholds), it was hypothesized that individuals with mTBI would have evidence of impaired neural encoding in the auditory brainstem compared to noninjured controls, as evidenced by delayed latencies and reduced amplitudes of ABR components...
March 17, 2017: Ear and Hearing
https://www.readbyqxmd.com/read/28316248/assessing-the-impact-of-post-traumatic-stress-symptoms-on-resting-state-function-networks-in-a-military-chronic-mild-traumatic-brain-injury-sample
#2
Dominic E Nathan, Julie F Bellgowan, Louis M French, Jonathan P Wolf, Terry Oakes, Jeannine B Mielke, Elyssa B Sham, Wei Liu, Gerard Riedy
The relationship between post traumatic stress disorder (PTSD) and chronic symptoms of mild traumatic brain injury (mTBI) is difficult to discern and poorly understood. An accurate differential diagnosis, assessment and treatment of mTBI and PTSD is challenging due to significant symptom overlap and the absence of clearly established biomarkers. The objective of this work is to examine how post traumatic stress influences task-free brain networks in chronic mTBI subjects. Control subjects (N=44) were compared with chronic mTBI subjects with low (N=58, PCLC total<30), medium (N=124, PCLC total = 31-49) and high (N=105, PCLC total ≥ 60) post traumatic stress symptoms (PTSS)...
March 19, 2017: Brain Connectivity
https://www.readbyqxmd.com/read/28314862/epidemiology-and-prognosis-of-mild-traumatic-brain-injury-in-returning-soldiers-a-cohort-study
#3
Karen Schwab, Heidi P Terrio, Lisa A Brenner, Renee M Pazdan, Henry P McMillan, Margaret MacDonald, Sidney R Hinds, Ann I Scher
OBJECTIVE: Mild traumatic brain injury (mTBI; concussion) is common in returning service members yet limited definitive evidence exists on its prognosis. METHODS: Almost 25,000 non-medically evacuated soldiers returning from Afghanistan or Iraq to 2 military bases between 2009 and 2014 were screened for mTBI. We invited a random sample to participate in the present study, oversampling those screening positive, resulting in 557 mTBI cases and 1,010 controls, of whom 366 cases and 599 controls completed 3-month follow-up evaluations...
March 17, 2017: Neurology
https://www.readbyqxmd.com/read/28295837/compromised-hippocampus-striatum-pathway-as-a-potential-imaging-biomarker-of-mild-traumatic-brain-injury-and-posttraumatic-stress-disorder
#4
D Rangaprakash, Gopikrishna Deshpande, Thomas A Daniel, Adam M Goodman, Jennifer L Robinson, Nouha Salibi, Jeffrey S Katz, Thomas S Denney, Michael N Dretsch
OBJECTIVES: Military service members risk acquiring posttraumatic stress disorder (PTSD) and mild-traumatic brain injury (mTBI), with high comorbidity. Owing to overlapping symptomatology in chronic mTBI or postconcussion syndrome (PCS) and PTSD, it is difficult to assess the etiology of a patient's condition without objective measures. Using resting-state functional MRI in a novel framework, we tested the hypothesis that their neural signatures are characterized by functionally hyperconnected brain regions which are less variable over time...
March 15, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28291466/development-of-a-portable-tool-for-screening-neuromotor-sequelae-from-repetitive-low-level-blast-exposure
#5
Christopher K Rhea, Nikita A Kuznetsov, Scott E Ross, Benjamin Long, Jason T Jakiela, Jason M Bailie, Matthew A Yanagi, F Jay Haran, W Geoffrey Wright, Rebecca K Robins, Paul D Sargent, Joshua L Duckworth
Blast exposure is a prevalent cause of mild traumatic brain injury (mTBI) in military personnel in combat. However, it is more common for a service member to be exposed to a low-level blast (LLB) that does not result in a clinically diagnosable mTBI. Recent research suggests that repetitive LLB exposure can result in symptomology similar to symptoms observed after mTBI. This manuscript reports on the use of an Android-based smartphone application (AccWalker app) to capture changes in neuromotor functioning after blast exposure...
March 2017: Military Medicine
https://www.readbyqxmd.com/read/28291459/clinical-and-magnetic-resonance-spectroscopic-imaging-findings-in-veterans-with-blast-mild-traumatic-brain-injury-and-post-traumatic-stress-disorder
#6
Anthony P Kontos, Anne C Van Cott, Jodilyn Roberts, Jullie W Pan, Monique B Kelly, Jamie McAllister-Deitrick, Hoby P Hetherington
OBJECTIVES: To compare magnetic resonance spectroscopic imaging (MRSI) findings from the hippocampal regions of military veterans with blast-related mild traumatic brain injury (blast mTBI) and post-traumatic stress disorder (PTSD) to those with PTSD only; and to examine the relationship of MRSI findings to cognitive and neuromotor impairment. METHODS: 35 military veterans-23 with blast mTBI and PTSD (blast mTBI/PTSD) and 12 with PTSD only participated in the study...
March 2017: Military Medicine
https://www.readbyqxmd.com/read/28290939/susceptibility-weighted-imaging-and-white-matter-abnormality-findings-in-service-members-with-persistent-cognitive-symptoms-following-mild-traumatic-brain-injury
#7
David F Tate, Maria Gusman, Jonathan Kini, Matthew Reid, Carmen S Velez, Ann Marie Drennon, Douglas B Cooper, Jan E Kennedy, Amy O Bowles, Erin D Bigler, Jeffrey D Lewis, John Ritter, Gerald E York
Mild traumatic brain injury (mTBI) is a major health concern among active duty service members and Veterans returning from combat operations, and it can result in variable clinical and cognitive outcomes. Identifying biomarkers that can improve diagnosis and prognostication has been at the forefront of recent research efforts. The purpose of this study was to compare the sensitivity and specificity of abnormalities identified using more traditional magnetic resonance imaging (MRI) sequences such as fluid attenuation inversion recovery (FLAIR) to more advanced MRI sequences such as susceptibility weighted imaging (SWI) among a cohort of active duty service members experiencing persistent cognitive symptoms after mTBI...
March 2017: Military Medicine
https://www.readbyqxmd.com/read/28290938/postconcussive-symptoms-ptsd-and-medical-disease-burden-in-treatment-seeking-oef-oif-ond-veterans
#8
Joah L Williams, Meghan E McDevitt-Murphy, James G Murphy, Ellen M Crouse
INTRODUCTION: The most common psychological and cognitive sequelae associated with deployments to Afghanistan (Operation Enduring Freedom) and Iraq (Operation Iraqi Freedom) are mild traumatic brain injury (mTBI) and post-traumatic stress disorder (PTSD). High rates of PTSD are often observed among Veterans with a history of mTBI, and persistent postconcussive symptoms commonly endorsed after mTBI are known to be associated with PTSD. Therefore, this study examined whether PTSD mediates relations between postconcussive symptoms and 2 indices of medical disease burden: 1) the number of disease categories positive for a diagnosis, or system disease burden, and 2) total number of physical diagnoses, or cumulative disease burden...
March 2017: Military Medicine
https://www.readbyqxmd.com/read/28284950/naloxone-exacerbates-memory-impairments-and-depressive-like-behavior-after-mild-traumatic-brain-injury-mtbi-in-mice-with-upregulated-opioid-system-activity
#9
Anna Lesniak, Pawel Leszczynski, Magdalena Bujalska-Zadrozny, Chaim G Pick, Mariusz Sacharczuk
The neuroprotective role of the endogenous opioid system in the pathophysiological sequelae of brain injury remains largely ambiguous. Noteworthy, almost no data is available on how its genetically determined activity influences the outcome of mild traumatic brain injury. Thus, the aim of our study was to examine the effect of opioid receptor blockage on cognitive impairments produced by mild traumatic brain injury in mice selectively bred for high (HA) and low (LA) swim-stress induced analgesia that show innate divergence in opioid system activity...
March 8, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28279125/micrornas-as-novel-biomarkers-for-the-diagnosis-and-prognosis-of-mild-and-severe-traumatic-brain-injury
#10
Valentina Di Pietro, Marco Ragusa, David James Davies, Zhangjie Su, Jon Hazeldine, Giacomo Lazzarino, Lisa J Hill, Nicholas Crombie, Mark Foster, Michele Purrello, A Logan, Antonio Belli
Traumatic brain injury (TBI) is the leading cause of death and disability under the age of 45 years in Western countries. Despite many studies, no reliable biomarkers have been found to assess TBI severity and predict recovery. MicroRNA (miRNA) profiling has become widely used to identify biomarkers and therapeutic targets. The expression of 754 miRNAs was analysed in serum of 5 mild TBI (mTBI) with extra-cranial injury (EC) patients, 5 severe TBI (sTBI) with EC patients and 5 healthy volunteers (HV) at 1 day and 15 days post injury, by using the TaqMan® Array Human MicroRNA A+B Cards...
March 9, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28274861/defining-the-biomechanical-and-biological-threshold-of-murine-mild-traumatic-brain-injury-using-chimera-closed-head-impact-model-of-engineered-rotational-acceleration
#11
Dhananjay R Namjoshi, Wai Hang Cheng, Asma Bashir, Anna Wilkinson, Sophie Stukas, Kris M Martens, Tom Whyte, Zelalem A Abebe, Kurt A McInnes, Peter A Cripton, Cheryl L Wellington
CHIMERA (Closed Head Impact Model of Engineered Rotational Acceleration) is a recently described animal model of traumatic brain injury (TBI) that primarily produces diffuse axonal injury (DAI) characterized by white matter inflammation and axonal damage. CHIMERA was specifically designed to reliably generate a variety of TBI severities using precise and quantifiable biomechanical inputs in a nonsurgical user-friendly platform. The objective of this study was to define the lower limit of single impact mild TBI (mTBI) using CHIMERA by characterizing the dose-response relationship between biomechanical input and neurological, behavioral, neuropathological and biochemical outcomes...
March 6, 2017: Experimental Neurology
https://www.readbyqxmd.com/read/28269506/mining-cross-frequency-coupling-microstates-from-resting-state-meg-an-application-to-mild-traumatic-brain-injury
#12
Marios Antonakakis, Stavros I Dimitriadis, Michalis Zervakis, Andrew C Papanicolaou, George Zouridakis
Recent studies have investigated the possible role of dynamic functional connectivity and the role of cross-frequency coupling (CFC) to provide the substrate for reliable biomarkers of brain disorders. In this study, we analyzed time-varying CFC profiles from resting state Magnetoencephal-ographic recordings of 30 mild Traumatic Brain Injury (mTBI) patients and 50 normal controls. Interactions among sensors at specific pairs of frequency bands were computed via estimation of phase-to-amplitude couplings. We then computed time-varying functional connectivity graphs that were described in terms of segregation (local efficiency, LE) and integration (global efficiency, GE) and mapped those graphs to time series of GE/LE estimates...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28269177/recursive-feature-elimination-for-biomarker-discovery-in-resting-state-functional-connectivity
#13
Hariharan Ravishankar, Radhika Madhavan, Rakesh Mullick, Teena Shetty, Luca Marinelli, Suresh E Joel
Biomarker discovery involves finding correlations between features and clinical symptoms to aid clinical decision. This task is especially difficult in resting state functional magnetic resonance imaging (rs-fMRI) data due to low SNR, high-dimensionality of images, inter-subject and intra-subject variability and small numbers of subjects compared to the number of derived features. Traditional univariate analysis suffers from the problem of multiple comparisons. Here, we adopt an alternative data-driven method for identifying population differences in functional connectivity...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268689/brain-activation-profiles-in-mtbi-evidence-from-erp-activity-of-working-memory-response
#14
Lianyang Li, Xianghong Arakaki, Thao Tran, Michael Harrington, Nikhil Padhye, George Zouridakis
In this study we analyzed event related potentials (ERPs) obtained in an N-back working memory test that varied in difficulty from 0- to 2-back. We collected 21 channels of activity from 11 mild traumatic brain injury (mTBI) patients and 7 normal controls, on three different visits, and used the amplitude and latency of the P300 component to characterize the subjects. A preprocessing procedure based on independent component analysis was used first to identify and eliminate electrophysiological noise on a single trial basis...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268687/impact-of-mild-traumatic-brain-injury-on-auditory-brain-stem-dysfunction-in-mouse-model
#15
Reza M Amanipour, Robert D Frisina, Samantha A Cresoe, Teresa J Parsons, Xiaoxia Zhu, Cesario V Borlongan, Joseph P Walton
The auditory brainstem response (ABR) is an electrophysiological test that examines the functionality of the auditory nerve and brainstem. Traumatic brain injury (TBI) can be detected if prolonged peak latency is observed in ABR measurements, since latency measures the neural conduction time in the brainstem, and an increase in latency can be a sign of pathological lesion at the auditory brainstem level. The ABR is elicited by brief sounds that can be used to measure hearing sensitivity as well as temporal processing...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28262507/influence-of-refractive-error-on-pupillary-dynamics-in-the-normal-and-mild-traumatic-brain-injury-mtbi-populations
#16
James Q Truong, Nabin R Joshi, Kenneth J Ciuffreda
PURPOSE: There have been several studies investigating static, baseline pupil diameter in visually-normal individuals across refractive error. However, none have assessed the dynamic pupillary light reflex (PLR). In the present study, both static and dynamic pupillary parameters of the PLR were assessed in both the visually-normal (VN) and the mild traumatic brain injury (mTBI) populations and compared as a function of refractive error. METHODS: The VN population comprised 40 adults (22-56 years of age), while the mTBI population comprised 32 adults (21-60 years of age) over a range of refractive errors (-9...
March 2, 2017: Journal of Optometry
https://www.readbyqxmd.com/read/28239838/which-matters-more-a-retrospective-cohort-study-of-headache-characteristics-and-diagnosis-type-in-soldiers-with-mtbi-concussion
#17
Alan G Finkel, Brian J Ivins, Juanita A Yerry, John S Klaric, Ann Scher, Y Sammy Choi
OBJECTIVE: To describe the diagnostic types and characteristics of headaches in soldiers with mild traumatic brain injury during the wars in Afghanistan and Iraq. BACKGROUND: Persistent post-traumatic headache interferes with returns to activity or duty. The most commonly cited headache diagnosis after concussion is migraine. We hypothesize that headache diagnosis type, eg, migraine, is not sufficient to predict relationships with occupational outcomes after concussion...
February 27, 2017: Headache
https://www.readbyqxmd.com/read/28231824/assessment-and-rehabilitation-of-central-sensory-impairments-for-balance-in-mtbi-using-auditory-biofeedback-a-randomized-clinical-trial
#18
Peter C Fino, Robert J Peterka, Timothy E Hullar, Chad Murchison, Fay B Horak, James C Chesnutt, Laurie A King
BACKGROUND: Complaints of imbalance are common non-resolving signs in individuals with post-concussive syndrome. Yet, there is no consensus rehabilitation for non-resolving balance complaints following mild traumatic brain injury (mTBI). The heterogeneity of balance deficits and varied rates of recovery suggest varied etiologies and a need for interventions that address the underlying causes of poor balance function. Our central hypothesis is that most chronic balance deficits after mTBI result from impairments in central sensorimotor integration that may be helped by rehabilitation...
February 23, 2017: BMC Neurology
https://www.readbyqxmd.com/read/28228694/survey-of-primary-contact-medical-and-chiropractic-clinicians-on-self-reported-knowledge-and-recognition-of-mild-traumatic-brain-injuries-a-pilot-study
#19
David N Taylor, Frank J Ponce, Stephen J Dyess
OBJECTIVE: The purpose of this study was to assess the self-reported knowledge of concussion recognition and treatment with first-contact family medical and chiropractic practitioners by means of a pilot study of the need, construct validity, and feasibility for further investigation of mild traumatic brain injury (MTBI) knowledge base. METHODS: Two hundred forty-eight practicing chiropractic and 120 medical physicians in the south and northeastern sections of the United States were contacted by e-mail, telephone, and postal mail to answer an 18-item survey on knowledge, diagnosis, and common practice with respect to traumatic brain injury patients...
March 2017: Journal of Chiropractic Medicine
https://www.readbyqxmd.com/read/28227758/mining-cross-frequency-coupling-microstates-from-resting-state-meg-an-application-to-mild-traumatic-brain-injury
#20
Marios Antonakakis, Stavros I Dimitriadis, Michalis Zervakis, Andrew C Papanicolaou, George Zouridakis, Marios Antonakakis, Stavros I Dimitriadis, Michalis Zervakis, Andrew C Papanicolaou, George Zouridakis, Michalis Zervakis, Marios Antonakakis, George Zouridakis, Andrew C Papanicolaou, Stavros I Dimitriadis
Recent studies have investigated the possible role of dynamic functional connectivity and the role of cross-frequency coupling (CFC) to provide the substrate for reliable biomarkers of brain disorders. In this study, we analyzed time-varying CFC profiles from resting state Magnetoencephal-ographic recordings of 30 mild Traumatic Brain Injury (mTBI) patients and 50 normal controls. Interactions among sensors at specific pairs of frequency bands were computed via estimation of phase-to-amplitude couplings. We then computed time-varying functional connectivity graphs that were described in terms of segregation (local efficiency, LE) and integration (global efficiency, GE) and mapped those graphs to time series of GE/LE estimates...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
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