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  1. Article: Spontaneous Middle Meningeal Artery Aneurysms: A Case Report and Review of the Literature.

    Ramirez Velandia, Felipe / Young, Michael / Ogilvy, Christopher S

    Cureus

    2023  Volume 15, Issue 11, Page(s) e49407

    Abstract: Most reported aneurysms concerning the middle meningeal artery (MMA) are pseudoaneurysms; however, there have been rare reports of non-traumatic MMA aneurysms in the literature. In this paper, we present the case of a 70-year-old female with a true 5-mm ... ...

    Abstract Most reported aneurysms concerning the middle meningeal artery (MMA) are pseudoaneurysms; however, there have been rare reports of non-traumatic MMA aneurysms in the literature. In this paper, we present the case of a 70-year-old female with a true 5-mm aneurysm in the anterior division of the left MMA that was causing erosion through the left temporal bone and was successfully treated with coil embolization. We also present a comprehensive literature review of non-traumatic MMA aneurysms reported since 1930. These aneurysms are associated with conditions such as hypertension, Paget's disease, and intracranial meningiomas and result from flow dynamics disturbances. Treatment involves both endovascular treatment and open surgery, while rupture, especially in the elderly, results in high disability, underscoring the importance of timely intervention upon identification.
    Language English
    Publishing date 2023-11-25
    Publishing country United States
    Document type Case Reports
    ZDB-ID 2747273-5
    ISSN 2168-8184
    ISSN 2168-8184
    DOI 10.7759/cureus.49407
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Flow Diversion as a Definitive Treatment for Recurrently Ruptured A1-A2 Anterior Cerebral Artery Aneurysm Following Clipping and Coiling.

    Ramirez-Velandia, Felipe / Young, Michael / Alwakaa, Omar / Han, Kimberly / Ogilvy, Christopher S

    Cureus

    2024  Volume 16, Issue 3, Page(s) e57103

    Abstract: Even after clipping of intracranial aneurysms, patients may experience incomplete occlusion or the future recurrence of their treated aneurysm. This paper presents a distinctive case of a recurrent A1-A2 anterior cerebral artery aneurysm that underwent ... ...

    Abstract Even after clipping of intracranial aneurysms, patients may experience incomplete occlusion or the future recurrence of their treated aneurysm. This paper presents a distinctive case of a recurrent A1-A2 anterior cerebral artery aneurysm that underwent four interventions over 16 years. The aneurysm was treated with two clippings, subsequent coiling, and flow diversion for definitive treatment. The challenges encountered in managing bifurcation aneurysms are discussed, emphasizing the importance of considering hemodynamic factors, vessel geometry, and recurrence risk factors in treatment decisions. The case highlights the need for closer follow-up of ruptured bifurcation aneurysms due to the higher likelihood of recurrence. The role of flow diverters in reinforcing vessel anatomy and preventing recurrence is also highlighted.
    Language English
    Publishing date 2024-03-28
    Publishing country United States
    Document type Case Reports
    ZDB-ID 2747273-5
    ISSN 2168-8184
    ISSN 2168-8184
    DOI 10.7759/cureus.57103
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Ventriculo-atrial shunt with occlusion of the internal jugular vein: operative experience and surgical technique.

    Quintero, Silvia Tatiana / Ramirez-Velandia, Felipe / Hortua Moreno, Andres Felipe / Vera, Lina / Rugeles, Paula / Azuero Gonzalez, Rafael Augusto

    Chinese neurosurgical journal

    2024  Volume 10, Issue 1, Page(s) 3

    Abstract: Background: Ventricular shunts are one of the most frequent techniques used for the management of hydrocephalus. The ventriculoperitoneal shunt (VPS) is the most commonly performed procedure, and the ventriculoatrial shunt (VAS) is the second option in ... ...

    Abstract Background: Ventricular shunts are one of the most frequent techniques used for the management of hydrocephalus. The ventriculoperitoneal shunt (VPS) is the most commonly performed procedure, and the ventriculoatrial shunt (VAS) is the second option in most medical centers. The main objective of this study is to introduce and describe a surgical approach for VAS outlining our experience and comparing it with traditional shunting techniques.
    Methods: In this retrospective cohort comparison study, we included patients with hydrocephalus treated with a surgical procedure between January 2010 and February 2021 at a single academic institution. We categorized the procedures into two groups: patients with VPS and conventional VAS grouped together into the conventional technique (CT) group, and the second group was patients with whom we performed VAS with complete internal jugular vein occlusion (IJVOT). We compared the surgical time, postoperative complications, and occurrence of shunt failure among the groups by performing univariate analysis using the Fisher exact test.
    Results: Out of the 106 patients included in the analysis, IJVOT was performed in 66 patients, and CT in 40 patients. The median surgical time was 60 min (IQR 60-90) for IJVOT versus 100 min (IQR 60-120) for CT (p < 0.01). In the follow-up a month after the procedure, 83.3% of patients with IJVOT and 62.5% of patients with CT did not require shunt removal or shunt revision (p < 0.01). Shunt revision rates were 12.5% and 1.5% for CT while 1.5% and 2.5% for IJVOT at 1 and 6 months after the procedure.
    Conclusion: Our findings demonstrate that VAS with IJVOT is a safe method that exhibited shorter surgical times and outcomes comparable to CT. However, since the present study represents the first cohort evaluating IJVOT, it is imperative to conduct larger prospective studies, along with clinical trials, to fully explore and establish efficacy, long-term outcomes, and an in-depth comparison among shunting techniques.
    Language English
    Publishing date 2024-01-12
    Publishing country England
    Document type Journal Article
    ZDB-ID 2836334-6
    ISSN 2057-4967 ; 2057-4967
    ISSN (online) 2057-4967
    ISSN 2057-4967
    DOI 10.1186/s41016-023-00354-z
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Comparison of Thromboembolic Events Between Pipeline Embolization Device (PED) Shield and PED/PED Flex: A Propensity Score-Matched Analysis.

    Ramirez-Velandia, Felipe / Enriquez-Marulanda, Alejandro / Filo, Jean / Young, Michael / Fodor, Thomas B / Sconzo, Daniel / Muram, Sandeep / Granstein, Justin H / Shutran, Max / Taussky, Philipp / Ogilvy, Christopher S

    Neurosurgery

    2024  

    Abstract: Background and objectives: The pipeline embolization device (PED) Flex with Shield technology is a third-generation flow diverter used for intracranial aneurysm treatment designed to decrease thrombogenicity through a phosphorylcholine coating. Herein, ... ...

    Abstract Background and objectives: The pipeline embolization device (PED) Flex with Shield technology is a third-generation flow diverter used for intracranial aneurysm treatment designed to decrease thrombogenicity through a phosphorylcholine coating. Herein, we aim to compare the rate of thromboembolic events in PED with Shield technology and PED without it through propensity score matching.
    Methods: We conducted a retrospective analysis of aneurysms treated with PED first-generation/PED Flex and PED with Shield between 2013 and 2023 at a single academic institution. Patients were matched through propensity score by controlling for confounding factors including age, smoking history, diabetes, previous subarachnoid hemorrhage, modified Rankin Scale pretreatment, location, aneurysm size, previous treatment, and clopidogrel or aspirin resistance. After matching, we evaluated for periprocedural and postoperative thromboembolic events. Data analysis was performed using Stata 14.
    Results: A total of 543 patients with 707 aneurysms treated in 605 procedures were included in the analysis. From these, 156 aneurysms were treated with PED with Shield (22.07%) and 551 (77.93%) without Shield technology. Propensity score matching resulted in 84 matched pairs. The rate of thromboembolic events was 3.57% for PED Shield and 10.71% for PED first-generation/PED Flex (P = .07), while retreatment rates were 2.38% for PED Shield and 8.32% for PED Flex (P = .09). Complete occlusion at first (P = .41) and last imaging follow-up (P = .71), in-stent stenosis (P = .95), hemorrhagic complications (P = .31), and functional outcomes (P = .66) were comparable for both groups.
    Conclusion: This is the first study in the literature performing a propensity scored-matched analysis comparing PED with PED with Shield technology. Our study suggests a trend toward lower thromboembolic events for PED Shield, even after controlling for aspirin and clopidogrel resistance, and a trend toward lower aneurysm retreatment rates with PED Shield, without reaching statistical significance.
    Language English
    Publishing date 2024-02-23
    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.0000000000002883
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Long-Term Outcomes After Stereotactic Radiosurgery for Pediatric Brain Arteriovenous Malformations: A Systematic Review.

    Pettersson, Samuel D / Elrafie, Mohamed K / Makarewicz, Jakub / Klepinowski, Tomasz / Skrzypkowska, Paulina / Filo, Jean / Ramirez-Velandia, Felipe / Fodor, Thomas / Lau, Tzak / Szmuda, Tomasz / Young, Michael / Ogilvy, Christopher S

    World neurosurgery

    2024  

    Abstract: Background: The long-term outcomes after stereotactic radiosurgery (SRS) for pediatric brain arteriovenous malformations (AVMs) remain poorly understood given the paucity of longitudinal studies. A systematic review was conducted to pool cumulative ... ...

    Abstract Background: The long-term outcomes after stereotactic radiosurgery (SRS) for pediatric brain arteriovenous malformations (AVMs) remain poorly understood given the paucity of longitudinal studies. A systematic review was conducted to pool cumulative incidences for all outcomes.
    Methods: PubMed, Embase, and Web of Science were queried to systematically extract potential references. The articles relating to AVMs treated via SRS were required to be written in English, involve pediatric patients (<18 years of age), and include a mean follow-up period of >5 years. Individual patient data were obtained to construct a pooled Kaplan-Meier plot on obliteration rates over time.
    Results: Among the 6 studies involving 1315 pediatric patients averaging a follow-up period of 86.6 months (range, 6-276), AVM obliteration was observed in 66.1% with cumulative probabilities of 48.28% (95% confidence interval [CI], 41.89-54.68), 76.11% (95% CI, 67.50-84.72), 77.48% (95% CI, 66.37-88.59) over 3, 5, and 10 years, respectively. The cumulative incidence of post-SRS hemorrhage, tumors, cysts, and de novo seizures was 7.2%, 0.3%, 1.6%, and 1.5%, respectively. The cumulative incidence of radiation-induced necrosis, edema, radiologic radiation-induced changes (RICs), symptomatic RICs, and permanent RICs were 8.0%, 1.4%, 28.0%, 8.7%, and 4.9%, respectively.
    Conclusions: Studies assessing long-term outcomes after SRS are moderate in quality and retrospective. Thus, interpretation with caution is advised given the variable degree of loss to follow-up, which suggests that complication rates may be higher than the values stated in the literature. Future prospective studies are needed to validate these findings.
    Language English
    Publishing date 2024-03-25
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 2534351-8
    ISSN 1878-8769 ; 1878-8750
    ISSN (online) 1878-8769
    ISSN 1878-8750
    DOI 10.1016/j.wneu.2024.03.108
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Thromboembolic Events in the Posterior Circulation after Flow Diversion - A Closer Look at the Coverage of the Posterior Cerebral Artery.

    Ramirez-Velandia, Felipe / Enriquez-Marulanda, Alejandro / Filo, Jean / Young, Michael / Fodor, Thomas B / Sconzo, Daniel / Muram, Sandeep / Granstein, Justin H / Shutran, Max / Taussky, Philipp / Ogilvy, Christopher S

    World neurosurgery

    2024  

    Abstract: Background: Flow diversion (FD) for bifurcation aneurysms requires excluding one of the branches from the parent artery, raising concern for ischemic events. Herein, we evaluate thromboembolic events and their relation with covering the origin of the ... ...

    Abstract Background: Flow diversion (FD) for bifurcation aneurysms requires excluding one of the branches from the parent artery, raising concern for ischemic events. Herein, we evaluate thromboembolic events and their relation with covering the origin of the posterior cerebral artery (PCA).
    Methods: This retrospective analysis included patients with confirmed basilar and proximal PCA aneurysms treated with FD between 2013 to 2023. Procedures were classified according to the coverage of the origin of the PCA. Thromboembolic events associated with the excluded PCA were evaluated.
    Results: Out of the total 28 aneurysms included, 7 were at the basilar-tip, 16 in the basilar trunk, and 5 in the P1-segment; fifteen were treated excluding one of the PCA. DAPT included aspirin-ticagrelor (57.1%), aspirin-clopidogrel (35.7%), and aspirin-prasugrel (3.57%). Complete and near-complete aneurysm occlusion was achieved in 80.8% of aneurysms treated in a median follow-up of 12.31 months. Thromboembolic complications occurred in three patients, two basilar perforator stroke and one basilar in stent thrombosis; but there was no statistically significant difference in these events between patients with PCA coverage and those without (p=0.46). Diminished and lack of flow was seen in eight and seven of the covered vessels. mRS≤2 was reported in 89.3% of patients in a median clinical follow-up of 5.5 months.
    Conclusion: Thromboembolic events are high in distal basilar and proximal PCA aneurysms, but PCA coverage was not associated with their occurrence. There was no difference in post-procedural disability between patients whose aneurysms were treated excluding one of the PCAs, and those who did not.
    Language English
    Publishing date 2024-05-09
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2534351-8
    ISSN 1878-8769 ; 1878-8750
    ISSN (online) 1878-8769
    ISSN 1878-8750
    DOI 10.1016/j.wneu.2024.05.011
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  7. Article ; Online: Associations Between Vitamin D Deficiency/Insufficiency and Depression Expose Health Disparities in Older Rural West Texans: A Project FRONTIER Study.

    Pourghaed, Mohammed / Sarangi, Ashish / Ramirez-Velandia, Felipe / Kopel, Jonathan / Culberson, John / Ashworth, Gabriela / Khan, Hafiz / Boles, Annette / Neugebauer, Volker / Lawrence, J Josh

    The American journal of geriatric psychiatry : official journal of the American Association for Geriatric Psychiatry

    2024  

    Abstract: Objective: To determine associations between Vitamin D (VD) levels and clinical depression through the Geriatric Depression Scale (GDS) and its questions and subdomains, stratified by demographics and Hispanic/Latino ethnicity (HLE).: Design, setting, ...

    Abstract Objective: To determine associations between Vitamin D (VD) levels and clinical depression through the Geriatric Depression Scale (GDS) and its questions and subdomains, stratified by demographics and Hispanic/Latino ethnicity (HLE).
    Design, setting, and participants: A cohort of 299 Project FRONTIER participants aged 62.6 ± 11.7 years old, 70.9% female, and 40.5% HLE were used. Standard correlation and regression analyses were employed.
    Measurements: The main outcome measures were VD (serum 25(OH)-VD) level, GDS-30 (30-item questionnaire), GDS-30 subfactors and questions, and HLE status. VD categories were defined as VD deficiency (VDD; ≤20 ng/mL), VD insufficiency (VDI; 21-29 ng/mL), VD sufficiency (30-38 ng/mL) and high VD sufficiency (>38 ng/mL).
    Results: The majority (61.5%) of samples fell into VDD/VDI categories. A significant negative association was found between VD level and GDS-30 total score. VD level was negatively correlated with Dysphoria and Meaninglessness GDS-30 subfactors. Although GDS subfactors were similar between HLE and non-HLE groups, VD levels were significantly lower in HLE samples. Finally, HLE/non-HLE groups were differentially stratified across VD categories. Only 4% of HLEs fell into the high VD sufficient category, suggesting low VD supplementation.
    Conclusion: A significant negative association between VD level and depressive symptoms was revealed in our aging Project FRONTIER participants. HLE individuals were overrepresented in VDD/VDI samples, and VDD/VDI was associated primarily with the Dysphoria GDS subdomain. Regression analysis predicted high VD sufficiency (95.5 ng/mL) to be associated with no depressive symptoms (GDS=0). Our results underscore troubling disparities in VD-related depressive symptoms between HLE and non-HLE populations.
    Language English
    Publishing date 2024-01-26
    Publishing country England
    Document type Journal Article
    ZDB-ID 1278145-9
    ISSN 1545-7214 ; 1064-7481
    ISSN (online) 1545-7214
    ISSN 1064-7481
    DOI 10.1016/j.jagp.2024.01.029
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  8. Article: Minimally Invasive Surgery for Managing Grade IV and V Spondylolisthesis.

    Ramirez Velandia, Felipe / Gomez Cristancho, David Camilo / Urrego Nieto, Andres / Marquez, Isabel / Restrepo Martinez, Alejandra / Becerra Ospina, Jaime Eduardo / Pérez Rodriguez, Juan Carlos

    Asian journal of neurosurgery

    2023  Volume 18, Issue 3, Page(s) 437–443

    Abstract: Surgical treatment of high-grade spondylolisthesis is controversial and aims at restoring the spinopelvic sagittal balance through complete or partial reduction of the listhesis. Nerve decompression and interbody fusion are necessary for patients ... ...

    Abstract Surgical treatment of high-grade spondylolisthesis is controversial and aims at restoring the spinopelvic sagittal balance through complete or partial reduction of the listhesis. Nerve decompression and interbody fusion are necessary for patients presenting with neurological deficit, severe pain, lower limb asymmetry, or deformities. We present the case and the results of a patient with high-grade spondylolisthesis, in whom minimally invasive management was performed. A narrative review in this topic is also provided. We performed a literature review of high-grade spondylolisthesis to compare our technique to current surgical alternatives. We included articles from PubMed, Embase, Scopus, Ovid, and Science Direct published between 1963 and 2022 that were written in English, German, and Spanish. The terms used were the following: "high grade spondylolisthesis," "spondyloptosis," "surgical management," "interbody fusion," and "arthrodesis." In all, 485 articles were displayed, from which we filtered 112 by title and abstract. At the end, 75 references were selected for the review. Different interbody fusion techniques can be used to correct the lumbosacral kyphosis and restore the spinopelvic parameters. A complete reduction of the listhesis is not always required. The surgical procedure carried out in our patient corresponds to the first known case of minimally invasive circumferential arthrodesis with iliac screws and sacral fixation in a high-grade dysplastic spondylolisthesis. This approach guarantees the correction of the lumbosacral kyphosis and a complete reduction of the listhesis. Further studies are required to determine whether the results of this case can be extrapolated to other patients with high-grade spondylolisthesis.
    Language English
    Publishing date 2023-09-22
    Publishing country India
    Document type Journal Article ; Review
    ZDB-ID 2621446-5
    ISSN 2248-9614 ; 1793-5482
    ISSN (online) 2248-9614
    ISSN 1793-5482
    DOI 10.1055/s-0043-1771317
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  9. Article: Muscular Function as an Alternative to Identify Cognitive Impairment: A Secondary Analysis From SABE Colombia.

    Garcia-Cifuentes, Elkin / Botero-Rodríguez, Felipe / Ramirez Velandia, Felipe / Iragorri, Angela / Marquez, Isabel / Gelvis-Ortiz, Geronimo / Acosta, María-Fernanda / Jaramillo-Jimenez, Alberto / Lopera, Francisco / Cano-Gutiérrez, Carlos Alberto

    Frontiers in neurology

    2022  Volume 13, Page(s) 695253

    Abstract: Background: Identification of cognitive impairment is based traditionally on the neuropsychological tests and biomarkers that are not available widely. This study aimed to establish the association between motor function (gait speed and handgrip ... ...

    Abstract Background: Identification of cognitive impairment is based traditionally on the neuropsychological tests and biomarkers that are not available widely. This study aimed to establish the association between motor function (gait speed and handgrip strength) and cognitive performance in the Mini-Mental State Examination, globally and by domains. A secondary goal was calculating a cut-off point for gait speed and handgrip strength to classify older adults as cognitively impaired.
    Methods: This is a secondary analysis of SABE Colombia (Salud, Bienestar & Envejecimiento), a survey that was conducted in 2015 on health, wellbeing, and aging in Colombia. This study used linear regression models to search for an association between motor function and cognitive performance. The accuracy of motor function measurements in identifying cognitive impairment was assessed with receiver operating characteristic (ROC) curves. This study also analyzed other clinical and sociodemographical variables.
    Results: Gait speed was associated with orientation (
    Conclusions: Gait speed and handgrip strength are similarly associated with the cognitive performance, exhibiting the most extensive association with orientation and language domains of the Mini-Mental State Examination. Gait speed and handgrip strength can easily be measured by any clinician, and they prove to be useful screening tools to detect cognitive impairment.
    Language English
    Publishing date 2022-02-18
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2564214-5
    ISSN 1664-2295
    ISSN 1664-2295
    DOI 10.3389/fneur.2022.695253
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  10. Article: Minimally Invasive Surgery for Managing Grade IV and V Spondylolisthesis

    Ramirez Velandia, Felipe / Gomez Cristancho, David Camilo / Urrego Nieto, Andres / Marquez, Isabel / Restrepo Martinez, Alejandra / Becerra Ospina, Jaime Eduardo / Pérez Rodriguez, Juan Carlos

    Asian Journal of Neurosurgery

    2023  Volume 18, Issue 03, Page(s) 437–443

    Abstract: Surgical treatment of high-grade spondylolisthesis is controversial and aims at restoring the spinopelvic sagittal balance through complete or partial reduction of the listhesis. Nerve decompression and interbody fusion are necessary for patients ... ...

    Abstract Surgical treatment of high-grade spondylolisthesis is controversial and aims at restoring the spinopelvic sagittal balance through complete or partial reduction of the listhesis. Nerve decompression and interbody fusion are necessary for patients presenting with neurological deficit, severe pain, lower limb asymmetry, or deformities. We present the case and the results of a patient with high-grade spondylolisthesis, in whom minimally invasive management was performed. A narrative review in this topic is also provided. We performed a literature review of high-grade spondylolisthesis to compare our technique to current surgical alternatives. We included articles from PubMed, Embase, Scopus, Ovid, and Science Direct published between 1963 and 2022 that were written in English, German, and Spanish. The terms used were the following: “high grade spondylolisthesis,” “spondyloptosis,” “surgical management,” “interbody fusion,” and “arthrodesis.” In all, 485 articles were displayed, from which we filtered 112 by title and abstract. At the end, 75 references were selected for the review. Different interbody fusion techniques can be used to correct the lumbosacral kyphosis and restore the spinopelvic parameters. A complete reduction of the listhesis is not always required. The surgical procedure carried out in our patient corresponds to the first known case of minimally invasive circumferential arthrodesis with iliac screws and sacral fixation in a high-grade dysplastic spondylolisthesis. This approach guarantees the correction of the lumbosacral kyphosis and a complete reduction of the listhesis. Further studies are required to determine whether the results of this case can be extrapolated to other patients with high-grade spondylolisthesis.
    Keywords spondylolisthesis ; spondylosis ; spondylolysis ; minimally invasive surgical procedures ; lumbar spine surgery ; anterior lumbar interbody fusion
    Language English
    Publishing date 2023-09-01
    Publisher Thieme Medical and Scientific Publishers Pvt. Ltd.
    Publishing place Stuttgart ; New York
    Document type Article
    ZDB-ID 2621446-5
    ISSN 2248-9614 ; 1793-5482 ; 2248-9614
    ISSN (online) 2248-9614
    ISSN 1793-5482 ; 2248-9614
    DOI 10.1055/s-0043-1771317
    Database Thieme publisher's database

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