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  1. Article ; Online: In Reply to the Letter to the Editor Regarding "Aneurysmal Subarachnoid Hemorrhage in COVID-19 Patients: A Case Series".

    Dodd, William S / Chalouhi, Nohra

    World neurosurgery

    2021  Volume 154, Page(s) 200

    MeSH term(s) COVID-19 ; Humans ; SARS-CoV-2 ; Subarachnoid Hemorrhage
    Language English
    Publishing date 2021-10-08
    Publishing country United States
    Document type Journal Article ; Comment
    ZDB-ID 2534351-8
    ISSN 1878-8769 ; 1878-8750
    ISSN (online) 1878-8769
    ISSN 1878-8750
    DOI 10.1016/j.wneu.2021.07.081
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    Zs.A 1159: Show issues Location:
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  2. Article ; Online: Delayed cerebral ischemia: A look at the role of endothelial dysfunction, emerging endovascular management, and glymphatic clearance.

    Motwani, Kartik / Dodd, William S / Laurent, Dimitri / Lucke-Wold, Brandon / Chalouhi, Nohra

    Clinical neurology and neurosurgery

    2022  Volume 218, Page(s) 107273

    Abstract: Delayed cerebral ischemia (DCI) contributes to extensive morbidity and mortality for patients with aneurysmal subarachnoid hemorrhage (SAH). Recent contributions to the basic and translational investigation of DCI have shed light on emerging concepts ... ...

    Abstract Delayed cerebral ischemia (DCI) contributes to extensive morbidity and mortality for patients with aneurysmal subarachnoid hemorrhage (SAH). Recent contributions to the basic and translational investigation of DCI have shed light on emerging concepts that may aid in the development of novel therapeutics. A clear association between cerebral vasospasm (CV) and DCI exists, but it is also known that DCI can affect brain parenchyma remote from sites of vasospasm. In this review, we highlight the most recent contributions to the understanding of the underlying pathophysiology of DCI including the emerging role of the glymphatic system. Furthermore, we discuss treatments for DCI, including both pharmacologic therapies and endovascular treatment of vasospasm. There continues to be a disconnect between interventions and targeted treatment against pathophysiology. This review is intended to serve as a catalyst for further research and discovery that can aid in improved treatment options for DCI.
    MeSH term(s) Brain Ischemia/drug therapy ; Cerebral Infarction ; Endovascular Procedures ; Humans ; Subarachnoid Hemorrhage/surgery ; Vasospasm, Intracranial/etiology ; Vasospasm, Intracranial/therapy
    Language English
    Publishing date 2022-05-06
    Publishing country Netherlands
    Document type Journal Article ; Review
    ZDB-ID 193107-6
    ISSN 1872-6968 ; 0303-8467
    ISSN (online) 1872-6968
    ISSN 0303-8467
    DOI 10.1016/j.clineuro.2022.107273
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  3. Article: Assessment of Blood Loss during Neuroendovascular Procedures.

    Goutnik, Michael / Nguyen, Andrew / Fleeting, Chance / Patel, Aashay / Lucke-Wold, Brandon / Laurent, Dimitri / Wahbeh, Tamara / Amini, Shawna / Al Saiegh, Fadi / Koch, Matthew / Hoh, Brian / Chalouhi, Nohra

    Journal of clinical medicine

    2024  Volume 13, Issue 3

    Abstract: 1) Background: Neuroendovascular procedures have generally been considered to have minor or inconsequential blood loss. No study, however, has investigated this question. The purpose of this study is to quantify the blood loss associated with ... ...

    Abstract (1) Background: Neuroendovascular procedures have generally been considered to have minor or inconsequential blood loss. No study, however, has investigated this question. The purpose of this study is to quantify the blood loss associated with neuroendovascular procedures and identify predictors of blood loss, using hemoglobin change as a surrogate for blood loss. (2) Methods: A retrospective review of 200 consecutive endovascular procedures (diagnostic and therapeutic) at our institution from January 2020 to October 2020 was performed. Patients had to have pre- and post-operative hematocrit and hemoglobin levels recorded within 48 h of the procedure (with no intervening surgeries) for inclusion. (3) Results: The mean age of our cohort was 60.1 years and the male representation was 52.5%. The mean pre-operative hemoglobin/hematocrit was significantly lower among females compared to males (12.1/36.2 vs. 13.0/38.5,
    Language English
    Publishing date 2024-01-24
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2662592-1
    ISSN 2077-0383
    ISSN 2077-0383
    DOI 10.3390/jcm13030677
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  4. Article ; Online: Adropin decreases endothelial monolayer permeability after cell-free hemoglobin exposure and reduces MCP-1-induced macrophage transmigration.

    Dodd, William S / Patel, Devan / Lucke-Wold, Brandon / Hosaka, Koji / Chalouhi, Nohra / Hoh, Brian L

    Biochemical and biophysical research communications

    2021  Volume 582, Page(s) 105–110

    Abstract: Background: Cell-free heme-containing proteins mediate endothelial injury in a variety of disease states including subarachnoid hemorrhage and sepsis by increasing endothelial permeability. Inflammatory cells are also attracted to sites of vascular ... ...

    Abstract Background: Cell-free heme-containing proteins mediate endothelial injury in a variety of disease states including subarachnoid hemorrhage and sepsis by increasing endothelial permeability. Inflammatory cells are also attracted to sites of vascular injury by monocyte chemotactic protein 1 (MCP-1) and other chemokines. We have identified a novel peptide hormone, adropin, that protects against hemoglobin-induced endothelial permeability and MCP-1-induced macrophage migration.
    Methods: Human microvascular endothelial cells were exposed to cell-free hemoglobin (CFH) with and without adropin treatment before measuring monolayer permeability using a FITC-dextran tracer assay. mRNA and culture media were collected for molecular studies. We also assessed the effect of adropin on macrophage movement across the endothelial monolayer using an MCP-1-induced migration assay.
    Results: CFH exposure decreases adropin expression and increases paracellular permeability of human endothelial cells. Treating cells with synthetic adropin protects against the increased permeability observed during the natural injury progression. Cell viability was similar in all groups and Hmox1 expression was not affected by adropin treatment. MCP-1 potently induced macrophage migration across the endothelial monolayer and adropin treatment effectively reduced this phenomenon.
    Conclusions: Endothelial injury is a hallmark of many disease states. Our results suggest that adropin treatment could be a valuable strategy in preventing heme-mediated endothelial injury and macrophage infiltration. Further investigation of adropin therapy in animal models and human tissue specimens is needed.
    MeSH term(s) Cell Line ; Cell Membrane Permeability/drug effects ; Cell Movement/drug effects ; Chemokine CCL2/antagonists & inhibitors ; Chemokine CCL2/pharmacology ; Cytoprotection/physiology ; Endothelial Cells/cytology ; Endothelial Cells/drug effects ; Endothelial Cells/metabolism ; Hemoglobins/antagonists & inhibitors ; Hemoglobins/pharmacology ; Humans ; Intercellular Signaling Peptides and Proteins/pharmacology ; Macrophages/cytology ; Macrophages/drug effects
    Chemical Substances CCL2 protein, human ; Chemokine CCL2 ; Enho protein, human ; Hemoglobins ; Intercellular Signaling Peptides and Proteins
    Language English
    Publishing date 2021-10-16
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 205723-2
    ISSN 1090-2104 ; 0006-291X ; 0006-291X
    ISSN (online) 1090-2104 ; 0006-291X
    ISSN 0006-291X
    DOI 10.1016/j.bbrc.2021.10.032
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 116: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
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    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)

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  5. Article: Adropin decreases endothelial monolayer permeability after cell-free hemoglobin exposure and reduces MCP-1-induced macrophage transmigration

    Dodd, William S. / Patel, Devan / Lucke-Wold, Brandon / Hosaka, Koji / Chalouhi, Nohra / Hoh, Brian L.

    Biochemical and biophysical research communications. 2021 Dec. 10, v. 582

    2021  

    Abstract: Cell-free heme-containing proteins mediate endothelial injury in a variety of disease states including subarachnoid hemorrhage and sepsis by increasing endothelial permeability. Inflammatory cells are also attracted to sites of vascular injury by ... ...

    Abstract Cell-free heme-containing proteins mediate endothelial injury in a variety of disease states including subarachnoid hemorrhage and sepsis by increasing endothelial permeability. Inflammatory cells are also attracted to sites of vascular injury by monocyte chemotactic protein 1 (MCP-1) and other chemokines. We have identified a novel peptide hormone, adropin, that protects against hemoglobin-induced endothelial permeability and MCP-1-induced macrophage migration.Human microvascular endothelial cells were exposed to cell-free hemoglobin (CFH) with and without adropin treatment before measuring monolayer permeability using a FITC-dextran tracer assay. mRNA and culture media were collected for molecular studies. We also assessed the effect of adropin on macrophage movement across the endothelial monolayer using an MCP-1-induced migration assay.CFH exposure decreases adropin expression and increases paracellular permeability of human endothelial cells. Treating cells with synthetic adropin protects against the increased permeability observed during the natural injury progression. Cell viability was similar in all groups and Hmox1 expression was not affected by adropin treatment. MCP-1 potently induced macrophage migration across the endothelial monolayer and adropin treatment effectively reduced this phenomenon.Endothelial injury is a hallmark of many disease states. Our results suggest that adropin treatment could be a valuable strategy in preventing heme-mediated endothelial injury and macrophage infiltration. Further investigation of adropin therapy in animal models and human tissue specimens is needed.
    Keywords cell viability ; chemokine CCL2 ; hemoglobin ; hemorrhage ; humans ; macrophages ; permeability ; research ; therapeutics
    Language English
    Dates of publication 2021-1210
    Size p. 105-110.
    Publishing place Elsevier Inc.
    Document type Article
    ZDB-ID 205723-2
    ISSN 0006-291X ; 0006-291X
    ISSN (online) 0006-291X
    ISSN 0006-291X
    DOI 10.1016/j.bbrc.2021.10.032
    Database NAL-Catalogue (AGRICOLA)

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  6. Article ; Online: The Evolution of Endovascular Therapy for Intracranial Aneurysms: Historical Perspective and Next Frontiers.

    Laurent, Dimitri / Lucke-Wold, Brandon / Leary, Owen / Randall, Morgan H / Porche, Ken / Koch, Matthew / Chalouhi, Nohra / Polifka, Adam / Hoh, Brian L

    Neuroscience insights

    2022  Volume 17, Page(s) 26331055221117560

    Abstract: The history of cerebral aneurysm treatment has a rich and storied past with multiple notable luminaries contributing insights. The modern era has transitioned from primarily clip ligation to increasing use of endovascular therapy. Even more recently, the ...

    Abstract The history of cerebral aneurysm treatment has a rich and storied past with multiple notable luminaries contributing insights. The modern era has transitioned from primarily clip ligation to increasing use of endovascular therapy. Even more recently, the use of intrasaccular flow diverters has been introduced for the treatment of wide necked aneurysms. The field is continuing to transform, and bioactive coils and stents have resurfaced as promising adjuvants to promote aneurysm healing. Advanced imaging modalities are being developed that could further advance the endovascular arsenal and allow for porous memory polymer devices to enter the field. This focused review highlights notable historic contributions and advances to the point of futuristic technology that is actively being developed.
    Language English
    Publishing date 2022-07-30
    Publishing country United States
    Document type Journal Article
    ISSN 2633-1055
    ISSN (online) 2633-1055
    DOI 10.1177/26331055221117560
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  7. Article ; Online: The era of flow diverters in aneurysm treatment.

    Jabbour, Pascal / Chalouhi, Nohra

    Neurosurgery

    2014  Volume 74, Issue 3, Page(s) E341–2

    MeSH term(s) Endovascular Procedures/instrumentation ; Humans ; Intracranial Aneurysm/surgery
    Language English
    Publishing date 2014-03
    Publishing country United States
    Document type Comment ; Letter
    ZDB-ID 135446-2
    ISSN 1524-4040 ; 0148-396X
    ISSN (online) 1524-4040
    ISSN 0148-396X
    DOI 10.1227/NEU.0000000000000255
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 1424: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
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    Jg. 1995 - 2021: Lesesall (1.OG)
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    Zs.MO 539: Show issues

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  8. Article ; Online: Evaluation of patients referred to the spine clinic via telemedicine and the impact on diagnosis and surgical decision-making.

    Melnick, Kaitlyn / Porche, Ken / Sriram, Sai / Goutnik, Michael / Cuneo, Micaela / Murad, Gregory / Chalouhi, Nohra / Polifka, Adam / Hoh, Daniel J / Decker, Matthew

    Journal of neurosurgery. Spine

    2023  Volume 39, Issue 4, Page(s) 600–606

    Abstract: Objective: Telemedicine encounters are expanding in utility for outpatient care and evaluation, partially as a necessity during the COVID-19 pandemic. It is unclear if telemedicine evaluation is comparable to in-person assessment of patients with spinal ...

    Abstract Objective: Telemedicine encounters are expanding in utility for outpatient care and evaluation, partially as a necessity during the COVID-19 pandemic. It is unclear if telemedicine evaluation is comparable to in-person assessment of patients with spinal pathology undergoing surgical consultation. The objective of this study was to determine if treatment plans change for spine patients evaluated in person following an initial telemedicine consultation.
    Methods: Patients referred to the authors' comprehensive spine center were evaluated first via telemedicine and then in clinic. Telemedicine evaluations were conducted via video evaluation with an attending surgeon. Demographic data including age, gender, and distance traveled from the clinic were retrospectively recorded. A chart review retrieved symptoms, radiographic details, and past medical history. The primary outcome was if the treatment plan changed (plan change [PC]) after seeing the patient in the clinic. Chi-square tests and binary logistical regression produced uni- and multivariate analyses.
    Results: There were 152 new patients seen via telemedicine and in person. Pathology was present in the cervical (28.3%), thoracic (9.9%), and lumbar (61.8%) spine. The most common symptom was pain (72.4%), followed by radiculopathy (66.4%), weakness (26.3%), myelopathy (15.1%), and claudication (12.5%). There were 37 patients (24.3%) for whom there was a PC after clinic evaluation, and of those, only 5 (3.3%) were due to physical examination (PCPE) findings. On univariate analysis, a longer duration between telemedicine and clinic visit (odds ratio [OR] 1.094 per 7 days, p = 0.003), having pathology in the thoracic spine (OR 3.963, p = 0.018) and lack of sufficient imaging (OR 25.455, p < 0.0001) were predictive of a PC. Having pathology in the cervical spine (OR 9.538, p = 0.047) and adjacent-segment disease (OR 11.471, p = 0.010) were predictive of a PCPE.
    Conclusions: This study demonstrates that telemedicine may be an effective modality for the initial evaluation of spine surgical patients, without compromising decision-making in the absence of an in-person physical examination.
    MeSH term(s) Humans ; Retrospective Studies ; Pandemics ; COVID-19 ; Telemedicine ; Cervical Vertebrae ; COVID-19 Testing
    Language English
    Publishing date 2023-06-30
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2158643-3
    ISSN 1547-5646 ; 1547-5654
    ISSN (online) 1547-5646
    ISSN 1547-5654
    DOI 10.3171/2023.5.SPINE23182
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    Uk I Zs.135 -Spine-: Show issues Location:
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  9. Article ; Online: Focused selection of open cerebrovascular cases for residents interested in cerebrovascular neurosurgery.

    Laurent, Dimitri / Lucke-Wold, Brandon / Pierre, Kevin / Bardhi, Olgert / Yue, Sijia / Brennan, Meghan / Fox, W Christopher / Chalouhi, Nohra / Koch, Matthew J / Hoh, Brian / Dow, Jamie S / Murad, Gregory J A / Polifka, Adam

    Neurocirugia (English Edition)

    2023  Volume 34, Issue 2, Page(s) 53–59

    Abstract: Introduction: National and international trends continue to show greater emphasis on endovascular techniques for the treatment of cerebrovascular disease. The cerebrovascular neurosurgeon however must be adequately equipped to treat these patients via ... ...

    Abstract Introduction: National and international trends continue to show greater emphasis on endovascular techniques for the treatment of cerebrovascular disease. The cerebrovascular neurosurgeon however must be adequately equipped to treat these patients via both open and endovascular techniques.
    Methods: The decline in open cerebrovascular cases for aneurysm clipping has forced many trainees to pursue open cerebrovascular fellowships to increase case volume. An alternative strategy has been employed at our institution, which is early identification of subspecialty focus with resident driven self-selection of open cerebrovascular cases.
    Results: This has allowed recent graduates to obtain enfolded endovascular training and a significant number of open cerebrovascular cases in order to obtain competence and exposure.
    Discussion: We advocate for further self-selection paradigms supplemented with simulation training in order to obviate the need for extended post-residency fellowships.
    MeSH term(s) Humans ; Neurosurgery/education ; Neurosurgical Procedures ; Internship and Residency ; Endovascular Procedures
    Language English
    Publishing date 2023-02-06
    Publishing country Spain
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ISSN 2529-8496
    ISSN (online) 2529-8496
    DOI 10.1016/j.neucie.2022.11.015
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  10. Article ; Online: Simulation-based neurosurgical training for the presigmoid approach with a physical model.

    Jabbour, Pascal / Chalouhi, Nohra

    Neurosurgery

    2013  Volume 73 Suppl 1, Page(s) 81–84

    Abstract: Background: In recent years, there has been growing interest in the use of simulation to supplement conventional surgical training. Simulation remains, however, in its infancy in neurosurgery.: Objective: To report on and assess the utility of a ... ...

    Abstract Background: In recent years, there has been growing interest in the use of simulation to supplement conventional surgical training. Simulation remains, however, in its infancy in neurosurgery.
    Objective: To report on and assess the utility of a simulation physical model for the presigmoid approach.
    Methods: The Congress of Neurological Surgeons created a Simulation Committee to explore and develop simulation-based models. The current model involves drilling of the presigmoid cranial base under image guidance. Each time the drill touches the dura, facial nerve, or sigmoid sinus, a beeping and a warning sound are emitted.
    Results: Nine neurosurgery residents participated in and completed the presigmoid approach simulation module. All residents successfully completed the simulation procedure within the allocated time period (20 minutes). The mean number of hits to the dura, facial nerve, and sigmoid sinus decreased from 4.2 in the first test to 3.1 in the second test (P < .05). The facial nerve was the most likely structure to be injured, followed by the sigmoid sinus and finally the dura. All 9 participants had an improvement in their technical scores.
    Conclusion: The presigmoid approach simulation model is a useful tool in resident education that may improve surgical proficiency while minimizing risk to patients. More studies with standardized end points for technical proficiency and clinical outcomes are needed.
    MeSH term(s) Clinical Competence ; Cranial Sinuses/surgery ; Humans ; Internship and Residency ; Models, Anatomic ; Neurosurgery/education ; Neurosurgery/methods ; Neurosurgical Procedures/education ; Neurosurgical Procedures/methods ; Skull/anatomy & histology ; Skull/surgery ; Skull Base/anatomy & histology ; Skull Base/surgery
    Language English
    Publishing date 2013-10
    Publishing country United States
    Document type Journal Article
    ZDB-ID 135446-2
    ISSN 1524-4040 ; 0148-396X
    ISSN (online) 1524-4040
    ISSN 0148-396X
    DOI 10.1227/NEU.0000000000000090
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