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**Abstract:**



AMA Research Challenge 2023

Bilateral Pulvinar Responsive Stimulation for Broad Onset Drug Resistant Epilepsy

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Join the AMA Research Challenge poster symposium and semifinals to explore top research posters, score posters in the semifinals (an AMA member exclusive opportunity) and attend education sessions with experienced physicians to learn tips to advance your research and career. 

Objective:
Chordomas are rare primary tumors of the skull base, sacrum and vertebral column, derived from remnants of the embryonic notochord. Treatment options consist of surgical resection, and radiotherapy, with few chemotherapy options available. This study reviews clinical trials focused on radiotherapy modalities, such as photon therapy and particle therapy, as well as the concomitant use of radiation sensitizers.

Methods:
Literature review on all published clinical trials studying the usage of photon, proton, and carbon ion radiotherapy for chordoma in adults, as well as all published literature on radiation sensitizers used for treatment of chordoma from 2000 to 2023. Reviewed all of the current clinical trials on radiotherapy for chordoma in adults. 

Results:
We found 8 clinical trials, which include data from 1 observational study, 1 pilot study, 2 Phase I studies, 2 Phase I-II studies, and 7 Phase II studies. Of the completed clinical trials, 2 focused on protons alone, 2 focused on combined proton-photon radiotherapy, and 4 focused on carbon ion radiotherapy. The lowest radiation dosage was 48.0 GyE for carbon ion radiotherapy and highest was 79.2 GyE using protons only. All clinical trials reported an overall survival rate above 50% at 3-year follow-up. Nine publications were found on the use of radiation sensitizers for chordomas, 6 of which included in vitro studies and 5 included in vivo studies, using both patient and xenograft models. 

Conclusion:
The completed clinical trials focus on evaluating the effectiveness of proton, photon, and carbon ion radiotherapy for treatment of skull-base, spine, and sacral chordoma. Current trials continue to focus on effectiveness of treatments as well as comparing the different forms of radiotherapy and determining appropriate doses. Research on radiation sensitizers for chordomas shows various therapies, ranging from hyperthermia to pharmaceutical options, that require further study. Altogether, research on radiotherapy and radiation sensitizers have been used alongside radiation with positive and promising results for chordoma.

Use of Ion Radiotherapy and Radiation Sensitizers for Treatment of Chordoma: A Narrative Review

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The Relationship of Pelvic Ganglia and Anterior Vesical Branches of the Pelvic Nerve in Human Cadavers

Evaluation of Flow-Diversion Procedures Using Microangioscopy: Correlation with Histology and Digital Subtraction Angiography

Background
Parkinson’s Disease (PD) is a progressive neurodegenerative movement disorder that encompasses neuropsychological symptoms. Symptoms of both motor and cognitive deficits are secondary to the depletion of dopaminergic neurons in the brain. Therefore, analyzing variables of neuroanatomical morphology, such as cortical gray matter volume and deep nuclei volume, can be used to characterize PD more completely. Such variables can also be compared with neurocognitive test performance and clinical movement assessment scores to elucidate a correlation with results of neuroimaging. Therefore, we hypothesize that neuroanatomical abnormalities will have corresponding changes in neurocognitive test performance and movement disorder assessment scores.

Methods
Using electronic medical records of PD patients, we retrospectively collected demographic and neurocognitive data from Robert Wood Johnson Medical School Neurosurgery department and Robert Wood Johnson Barnabas Health hospital systems. Neuroimaging records were segmented, normalized, and smoothed using Statistical Parametric Mapping (SPM12) software. Group level analysis of gray matter densities was compared between 45 controls subjects with no history of a movement disorder and 45 PD subjects using Voxel-Based Morphometry (VBM) to generate statistical maps brain regions with statistically significant differences in tissue volume. Significance was determined by p< 0.001 and a threshold of 50 voxels.

Results
SPM results were based on two contrasts: CN-PD (decreased gray matter volume in the PD group compared to controls) and PD-CN (increased gray matter volume in the PD group compared to controls). Peak regions of difference in the CN-PD group were observed in the putamen, globus pallidus, entorhinal area, parahippocampal gyrus, middle frontal gyrus, and cerebellar cortex. Conversely, in the PD-CN group, increased gray matter volumes were observed in the brain stem, thalamus proper, supplementary motor cortex, and middle cingulate gyrus.

Conclusion
Based on the results, we concluded that PD and related movement disorders are associated with significant reductions in gray matter in regions of the BG, hippocampal formation, cerebellar cortex, and primary motor cortex, which are regions involved with motor initiation, regulation, and learning. Also, Significant increases in gray matter of PD subjects were found in the thalamus, temporal gyrus, cingulate gyrus, and supplementary motor cortex, involved in movement and processing of auditory information and emotions.

MRI Correlates of Neurocognitive Functioning in Movement Disorders

Opioids are a leading cause of overdose-related deaths in the US, accounting for 70.6% of fatalities in 2019 due primarily to respiratory depression. Epidural electrical stimulation (EES) has emerged as a novel approach for facilitating rhythmic movement such as respiration in humans and rodent models. To reveal the mechanism underpinning modulation of respiratory neural circuits, we compared the effects of dorsal and ventral cervical epidural electrical stimulation (D-CEES, V-CEES) on respiration after opioid-induced respiratory suppression or depression (OIRD) via administration of remifentanil in anesthetized patients undergoing medically necessary spinal cord surgery. We hypothesized that V-CEES activates ventral horn motoneurons while D-CEES recruits local spinal circuits and tracts to supraspinal structures. We enrolled 43 patients receiving opioids during ventral (n = 25) and dorsal (n = 18) cervical spinal surgery. EES was delivered to the spinal cord (C2-C7) for <90 seconds at an optimal intensity (0.5-5mA) at 5Hz or 30Hz. The subjects’ vital signs were recorded intraoperatively. Electromyograms (EMG) were used to monitor respiratory and upper extremity muscles such as the diaphragm, laryngeal, intercostal, genioglossal, and deltoid muscles bilaterally. The anesthesia stage was measured via electroencephalogram (EEG). A pneumotach recorded each patient’s airway pressure. An independent anesthesiologist, tasked with ensuring patient safety, maintained a stable surgical plane of anesthesia via propofol in conjunction with minimal remifentanil prior to EES. We divided the responses into 2 states: ON- and OFF-State. The ON-State condition was defined as suppressed, but still present, respiration compared to baseline through an additional dose of remifentanil (0.001-.05mcg/kg/min). OFF-State condition was produced by dosing the subject with the lowest sufficient concentration of remifentanil (0.05-0.1mcg/kg/min) necessary to induce apnea. We observed four main differences between D- and V-CEES in regulating respiration in the presence of remifentanil: 1) D-CEES alone induced inspiratory phase resetting; 2) D-CEES induced longer lasting respiratory modulation after EES cessation; 3) D-CEES induced both frequency and tidal volume changes of respiration while V-CEES modulated the tidal volume more significantly; and 4) D-CEES respiratory modulation was inhibited more significantly during the OFF-state, while the most responsive spinal level to V-CEES, C6/7, maintained its respiratory modulation in both ON- and OFF-States. These observations suggest D- and V-CEES facilitate respiration via different neural circuits.

Dorsal and Ventral Cervical Epidural Electrical Stimulation Opposes Opioid-Induced Respiratory Depression via Different Respiratory Neural Circuits

Introduction: Increasing frailty is a significant determinant of perioperative morbidity and mortality within neurosurgical literature. This study investigates the predictive value of the modified frailty index 5 (mFI-5) for postoperative morbidity and mortality following surgical drainage of chronic subdural hematoma (cSDH).

METHODS: A retrospective cohort study was performed on patients who underwent surgical evacuation of a cSDH. The mFI-5 score was calculated for each patient and used to stratify patients: prefrail (mFI-5<2), frail (mFI-5 [ 2), and
severely frail (mFI-5>2). Multivariate Cox proportional hazards (CPH) regression analysis were used to identify factors associated with our primary outcomes: overall
survival and 30-day readmission. Secondary outcomes included nonhome discharge, length of stay, hematoma accumulation, development of new postoperative neurologic deficits, resolution of preoperative neurologic deficits, and a modified Rankin score >2 at discharge.

RESULTS: 118 patients with a mean age of 74.4 +/- 11.9 years were analyzed. All baseline demographics were similar across the 3 groups. On multivariate analysis,
severely frail patients (N [ 24, 20.3%) had increased rates of 30-day readmission (hazard ratio [HR] 4.3, CPH regression P value<0.001) and postoperative mortality (HR 3.1, CPH regression P value<0.01) compared to the prefrail cohort. Severely frail patients had increased rates of nonhome disposition (HR 9.6, CPH regression P value<0.001), development of new postoperative neurologic deficits (HR 2.75, CPH regression P value [ 0.03), and hematoma reaccumulation (HR 4.07, CPH regression
P value [ 0.004). A novel scoring system accounting for patient age and frailty was predictive of 90-day mortality (area under the curve 0.77).

CONCLUSIONS: Frailty, measured by the mFI-5, and our novel scoring system holds a predictive value regarding outcomes for patients undergoing surgical drainage of a
cSDH.

Utility of the mfi-5 Score in Outcome Prediction for Patients with Chronic
Subdural Hematoma

Background
Freezing of gait (FoG) is a symptom of Parkinson Disease (PD) that can interrupt daily life and cause devastating falls. Previous research has demonstrated benefits of cueing on FoG. Many cue modalities are not ideal for real-world applications, affecting social interaction or requiring adherence to cadences. Non-rhythmic, spatial augmented reality (AR) cues are promising in their versatility and user-friendliness but have not proven effective in reducing FoG, possibly due to field-of-view (FOV) limitations of AR headsets or suboptimal control of how cues are displayed. We designed a clinical trial and a novel cue to study how to best utilize non-rhythmic spatial AR cues to treat FoG.
Methods
In this single-center, crossover, unblinded study, 36 PD patients will complete walking tasks in an AR environment projected by the Magic Leap 2 (ML2), a recently released AR headset with a larger FOV than prior models. An AR cue consisting of two concentric circles (designed for use when walking straight or turning) with radii based on stride length will be presented in several randomized variations: constant, user hand-triggered as-needed, user eye-triggered as-needed, examiner-triggered as-needed. AR strategies will be compared to a proven physical cue and a control (no cue) condition. FoG and gait parameters will be compared between the test arms.
Results
So far, fifteen participants have completed the trials. 86.7% said they would use the cue on a daily, real-world basis. The preferred condition varied widely between individuals. The “no cue” condition was never selected as preferred but was selected most frequently as the least preferred. Averaging results across the group, time spent in FoG was lowest in AR cue conditions and highest in the physical cue condition. The top two AR cue conditions per individual significantly reduced time in FoG compared to the physical and no cue conditions. Intermittent and constant AR cueing achieved statistically similar outcomes.
Conclusion
The most effective and preferred manner of AR cueing varies per individual. Visuospatial AR cues can decrease time spent in FoG and perform as well as or better than physical cues.


Optimizing Augmented Reality Cueing Strategies for Freezing of Gait in PD: The ELIMINATE FoG Study

Rationale: 
Our pilot study has shown that electrical stimulation of specific brain regions through responsive neurostimulation (RNS) can improve memory consolidation [1]. This study aims to reinforce and investigate whether responsive neurostimulation (RNS) devices can improve memory function through the administration of verbal and non-verbal learning tasks. We hypothesize that direct cortical stimulation with RNS could improve memory. 

Methods:
In an outpatient setting, a verbal learning task (Hopkins Verbal Learning Test-Revised) was administered to patients with RNS implants in various brain regions (hippocampal, temporal, and insular) [2]. For the verbal task, patients read a list of 12 semantically related words and tried to recall the list in the 3 different trials, along with a delayed recall and recognition trial performed 20 minutes later. True or sham stimulations were administered to patients through Neuropace.

Results:
Most of the 34 participants were right-handed (88.2%) with the remainder being left-handed (11.8%). Of the two RNS electrodes, 44.1% had the first electrode in the hippocampus. Only 28 patients had RNS data collected. A paired two-sided t-test with an alpha level of .05 was performed for all statistical tests. Although current results show no statistical significance, there still is a trend for patients who underwent electrical stimulation at the time of learning to perform better on recall than those who had sham stimulations, especially in the delayed recall trial. ​

Conclusion:
The pilot study found that RNS stimulation can improve memory encoding; however, the smaller sample size prompted continuing investigation and analysis of RNS impact on memory. The current results show a trend for improvement of memory with electrical stimulation during verbal tasks. We plan to acquire more data to more effectively interpret the effects of RNS on memory. 


The Impact of Brain Stimulation on Verbal Memory

Background/ Objectives: 
Migraines are the second leading cause of disability worldwide. However, there is a paucity of research focused on the clinical presentation of chronic migraines (CM) in Native Hawaiians and other Pacific Islanders (NHOPI). This study aims to identify possible differences in the clinical presentation of CM in NHOPI in contrast to other Ethnocultural racial groups in Hawaii.
Methods:
A retrospective case-control study was conducted to examine the relationship between demographics, comorbidities, and chronic migraines. Data from a single neurological care center in Hawaii were used to identify adults aged ≥18 years diagnosed with CM between 2018-2023. Adults with CM were matched for age and sex to 3 controls (patients with radiculopathy who did not present with CM). 
Results:
Overall, 309 CM patients and 964 matched controls were identified for analysis. NHOPI populations accounted for 24.9% of CM and 26% of radiculopathy patients. NHOPIs, on average, were diagnosed with CM or radiculopathy 2-3 years earlier (p=0.07) and had a higher average BMI than their White counterparts (p<0.01). Among NHOPIs, CM cases were more likely to have public insurance coverage (p=0.04), hyperlipidemia (p<0.01), diabetes (p=0.02), and insomnia (p=0.01). They were also more likely to be on more medications than White patients (p<0.001). 
Conclusion:
NHOPI CM patients were more likely to be diagnosed earlier than White patients and had higher BMIs, as well as higher rates of hyperlipidemia, insomnia, diabetes, and polypharmacy. These findings have important implications for understanding underlying comorbidities among NHOPI CM patients and developing targeted interventions.

Chronic Migraine and Comorbidity Characterization: A Focus on Native Hawaiians and Other Pacific Islanders


Background: Rett Syndrome (RTT) is a progressive X-linked neurodevelopmental disorder affecting 1 in 10,000 live female births, caused by deletions in the methyl-CpG binding protein 2 gene (MECP2). It is characterized by developmental regression, stereotypical hand movements, motor dysfunction, language impairments and seizures. Retrospective case reports have indicated atypical pain perception in patients with RTT. Yet, studies in patients and the MeCP2-/+ heterozygous (Het) mouse model of RTT have been inconclusive, with both hypoalgesia and hyperalgesia reported. Since the MeCP2 protein is a critical transcriptional repressor factor expressed in sensory neurons, mechanisms have been speculated for the modulation of pain by MeCP2. However, few studies have explored its role in atypical pain perception with a translational model of RTT. A better characterization of abnormal pain behavior in an RTT model is critical for future mechanistic studies to provide better care for these patients. 

Methods: MeCP2-/+ female mice and age-matched wild-type (WT) female littermates were used. Two different ages were evaluated: 6-8 weeks (pre-symptomatic) and 4 months (symptomatic) when the RTT phenotype was present and consistent. Phenotype was assessed using a neurobehavioral score (looking at paw clench, respiratory pattern, and mobility) along with Catwalk Gait analysis. Pain sensitivity and thresholds were assessed to mechanical (Von Frey test) and heat (Hargreaves test) stimuli.

Results: MeCP2-/+ mice showed variation in their sensitivity to pain as their disease progressed. Pre-symptomatic mice were hypersensitive to both mechanical and thermal pain, shown by increased responses to tactile stimulus on Von Frey filament testing and decreased paw withdrawal latency on thermal Hargreaves testing. However, with the progression of disease phenotype, MeCP2-/+ mice became hyposensitive to both mechanical and thermal pain. These changes appeared to be independent of their motor ability.

Conclusion: MeCP2-/+ female mice represent a useful preclinical RTT model and exhibit abnormal pain behavior, with initial hyperalgesia and eventual hypoalgesia that appears to be independent of motor function. Since MeCP2 overexpression has been associated with increased pain tolerance, lack of MeCP2 in the Het female mice may contribute to the early pain hypersensitivity. Future studies are needed to explore the cellular and molecular mechanisms involved in this altered pain sensation during the progression of RTT and for developing stage-dependent therapeutic targets.

Next from AMA Research Challenge 2023

Use of Ion Radiotherapy and Radiation Sensitizers for Treatment of Chordoma: A Narrative Review