Faculty Bibliography

Large hemispheric infarcts occur in up to 10% of all ischemic strokes and can cause devastating disability. Significant research and clinical efforts have been made in hopes of mitigating the morbidity and mortality of this disease. Areas of interest include identifying predictors of malignant edema, optimizing medical and surgical techniques, selecting the patient population that would benefit most from decompressive hemicraniectomy, and studying the impact on quality of life of those who survive. Decompressive surgery can be a life-saving measure, and here we discuss the most up-to-date literature and provide a review on the surgical management of large hemispheric ischemic strokes.

Background/UNASSIGNED:The ictal examination is crucial for neuroanatomic localization of seizure onset, which informs medical and neurosurgical treatment of epilepsy. Substantial variation exists in ictal examination performance in epilepsy monitoring units (EMUs). We developed and implemented a standardized examination to facilitate rapid, reliable execution of all testing domains and adherence to patient safety maneuvers. Methods/UNASSIGNED:Following observation of examination performance, root cause analysis of barriers, and review of consensus guidelines, an ictal examination was developed and disseminated. In accordance with quality improvement methodology, revisions were enacted following the initial intervention, including differentiation between pathways for convulsive and nonconvulsive seizures. We evaluated ictal examination fidelity, efficiency, and EMU staff satisfaction before and after the intervention. Results/UNASSIGNED:We identified barriers to ictal examination performance as confusion regarding ictal examination protocol, inadequate education of the rationale for the examination and its components, and lack of awareness of patient-specific goals. Over an 18-month period, 100 ictal examinations were reviewed, 50 convulsive and 50 nonconvulsive. Ictal examination performance varied during the study period without sustained improvement for convulsive or nonconvulsive seizure examination. The new examination was faster to perform (0.8 vs 1.5 minutes). Postintervention, EMU staff expressed satisfaction with the examination, but many still did not understand why certain components were performed. Conclusion/UNASSIGNED:We identified key barriers to EMU ictal assessment and completed real-world testing of a standardized, streamlined ictal examination. We found it challenging to reliably change ictal examination performance in our EMU; further study of implementation is warranted.

Purpose: African American (AA) patients are at risk for increased rates of rejection after heart transplantation (HT).We compared cell-free DNA (cf-DNA) levels after HT by recipient race.
Method(s): This was a retrospective analysis of 96 HT recipients from the Genomic Research Alliance for Transplantation (GRAFT) Registry, of which 63 patients had cf-DNA values. Cf-DNA values were compared by race withan exponential decay model and Kaplan-Meier (KM) analysis was performed to compare time-to-first rejection.
Result(s): Compared to non-AA patients, AA recipients had a similar prevalence of diabetes and hypertension,proportion of males, and donor characteristics. AA recipients had higher cf-DNA values compared to non-AA recipients for the first five days following transplant (8.3% vs. 3.2% p=0.001 Table 1/figure 1). The stable state cf-DNA values decayed rapidly for AA patients and equalized to non-AA patients over the first 7 days (0.46% vs 0.45%, p=0.8 Table 1). Cellular rejection did not differ by race (HR [CI]=1.4 [0.62,3.2], p=0.4). However AA were at higher risk of antibody mediated rejection (HR [CI]=3.8 [1.3,10.9], p=0.01).
Conclusion(s): African American patients had increased cf-DNA values in the first week following heart transplant. This may be a marker of early injury contributing to increased rates of allograft rejection in AA patients. Further analysisadjusting for confounding variables and determining predictors of clinical outcomes will be included at the time of presentation once follow-up of the GRAFT registry is complete.
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BACKGROUND:Ice hockey has significant workload demands. Research of other sports has suggested that decreased rest between games as well as an increased workload may increase the risk of injuries. PURPOSE/OBJECTIVE:To evaluate whether condensed game schedules increase the frequency and severity of injuries in the National Hockey League (NHL). STUDY DESIGN/METHODS:Descriptive epidemiology study. METHODS:Data were obtained from publicly available online sources on game schedules and injuries for all NHL teams for the 2005-2006 through 2018-2019 seasons. Injury rates (per team per game) and the proportion of severe and nonsevere injuries were determined. The game-spacing analysis assessed the risk of injuries in relation to the number of days between games played (range, 0-≥6 days). The game-density analysis assessed the risk of injuries in relation to the number of games played within 7 days (range, 1-5 games). Results were assessed by analysis of variance, the post hoc Tukey test, and the chi-square test of distribution. RESULTS:), with significant differences between all groups except for the comparison between 1 versus 2 games in 7 days. CONCLUSION/CONCLUSIONS:We found that a condensed schedule and <1 day of rest between games were associated with an increased rate of injuries in the NHL. These findings may help in the design of future game schedules.

This is a patient with multiple meningoencephaloceles which resulted in bacterial meningitis and subsequent status epilepticus. We identify impressive imaging findings demonstrating herniation of the meninges from nasal and bitemporal skull base defects possibly as a result of intracranial hypertension.

OBJECTIVE:We sought to identify similarities and differences in the diagnostic requirements for ancillary testing for determination of brain death/death by neurologic criteria (BD/DNC) around the world. METHODS:We reviewed diagnostic requirements for ancillary testing for BD/DNC in 78 unique official national BD/DNC protocols obtained from contacts worldwide between January 2018 and April 2019. RESULTS:Details provided on the performance and interpretation of ancillary tests for determination of BD/DNC were variably provided and inconsistent. Approximately half of all protocols that included each ancillary test provided details about study performance: 63% of protocols that included conventional cerebral angiography, 55% of protocols that included electroencephalography, 50% of protocols that included somatosensory evoked potentials, 48% of protocols that included transcranial Doppler ultrasonography, 43% of protocols that included nuclear medicine flow study and 41% of protocols that included brainstem auditory evoked potentials. Similarly, about half of all protocols that included each ancillary test provided details about study interpretation: 66% of protocols that included electroencephalography, 59% of protocols that included brainstem auditory evoked potentials, 56% of protocols that included somatosensory evoked potentials, 55% of protocols that included transcranial Doppler ultrasonography, 52% of protocols that included conventional cerebral angiography and 49% of protocols that included nuclear medicine flow study. INTERPRETATION/CONCLUSIONS:Diagnostic requirements for ancillary testing in BD/DNC determination vary around the world. We hope that the World Brain Death Project will improve worldwide consensus on the diagnostic requirements for ancillary testing in BD/DNC, both for performance and interpretation.

Fatal familial insomnia (FFI) is a rare inherited prion disease characterized by sleep, autonomic and motor disturbances. Neuro-ophthalmological abnormalities have been reported at the onset of disease, though not further characterized. We analyzed video recordings of eye movements of six FFI patients from three unrelated kindreds, seen within six months from the onset of illness. Excessive saccadic intrusions was the most prominent finding. In patients with severe insomnia, striking saccadic intrusions are an early diagnostic clue for FFI. The fact that the thalamus is the first structure affected in FFI also suggests its role in the control of steady fixation. This article is protected by copyright. All rights reserved.

OBJECTIVE:Familial Dysautonomia (FD) disease, lacks a useful biomarker for clinical monitoring. In this longitudinal study we characterized the structural changes in the macula, peripapillary and the optic nerve head (ONH) regions in subjects with FD. METHODS:Data was consecutively collected from subjects attending the FD clinic between 2012 and 2019. All subjects were imaged with spectral-domain Optical Coherence Tomography (OCT). Global and sectoral measurements of mean retinal nerve fiber layer (RNFL) and macular ganglion cell and inner plexiform layer (GCIPL) thickness, and ONH parameters of rim area, average cup-to-disc (C:D) ratio, and cup volume were used for the analysis. The best fit models (linear, quadratic and broken stick linear model) were used to describe the longitudinal change in each of the parameters. RESULTS:91 subjects (149 eyes) with FD of ages 5-56 years were included in the analysis. The rate of change for average RNFL and average GCIPL thicknesses were significant before reaching a plateau at the age of 26.2 for RNFL and 24.8 for GCIPL (- 0.861 µm/year (95% CI - 1.026, - 0.693) and - 0.553 µm/year (95% CI - 0.645, - 0.461), respectively). Significant linear rate of progression was noted for all ONH parameters, except for a subset of subjects (24%), with no cupping that did not show progression in any of the ONH parameters. CONCLUSIONS:The rapidly declining RNFL and GCIPL can explain the progressive visual impairment previously reported in these subjects. Among all structural parameters, ONH parameters might be most suitable for longitudinal follow-up, in eyes with a measurable cup.