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Brown CD, Shewark E, Pepper J, Ali M, Pearson AL. A Critical Appraisal of a University's Response to a Campus Mass Shooting: Perspectives from Public Health Students and Researchers at Michigan State University. Popul Health Manag 2024. [PMID: 38647651 DOI: 10.1089/pop.2023.0294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/25/2024] Open
Abstract
Mass shootings are a public health crisis and have become more frequent on U.S. university campuses over the past decade, with the number doubling since 2000. Due to this alarming trend, many institutions have developed response strategies for active shooting events. Yet, the extent to which these response strategies address the needs and minimize harm for students, faculty, and staff has not been evaluated critically after a campus mass shooting. Michigan State University (MSU) experienced a mass shooting on February 13, 2023. Before, during, and 6 months following this tragedy, the university employed an estimated 18 strategies to inform, support, and protect its students, faculty, and staff. While MSU continues to address concerns and roll out programs related to this event, here we aimed to (1) create a timeline of resources and communication provided by MSU from the event to 6 months post-event; (2) critically evaluate the extent to which these resources met the needs of students, faculty, and staff through a survey among persons involved in public health research; and (3) identify potential areas for improvement in the university's responses. We used an online survey where participants (n = 10) rated the university responses and provided additional comments. From our survey, we recommend that, in the event of a campus shooting, other universities are attentive to re-engaging with the community within which the university is situated, holding communal events on campus, offering pauses in classes, and enhancing mental health services. These responses were seen as crucial to re-establish campus life and learning.
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Affiliation(s)
- Catherine D Brown
- Department of Geography, Environment, and Spatial Sciences, Michigan State University, East Lansing, Michigan, USA
| | - Elizabeth Shewark
- Department of Psychology, Michigan State University, East Lansing, Michigan, USA
| | - Joshua Pepper
- Department of Geography, Environment, and Spatial Sciences, Michigan State University, East Lansing, Michigan, USA
| | - Muzammil Ali
- Department of Geography, Environment, and Spatial Sciences, Michigan State University, East Lansing, Michigan, USA
| | - Amber L Pearson
- CS Mott Department of Public Health, Michigan State University, East Lansing, Michigan, USA
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2
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Pepper J, Rodrigues D, Gallo P. Endoscopic third ventriculostomy for hydrocephalus after craniovertebral decompression for Chiari malformation type I: technical nuances and surgical pitfalls. Childs Nerv Syst 2023; 39:3501-3507. [PMID: 37261535 DOI: 10.1007/s00381-023-06011-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Accepted: 05/27/2023] [Indexed: 06/02/2023]
Abstract
PURPOSE Hydrocephalus after craniovertebral decompression (CVD) for Chiari I malformation (CM-1) is a well-recognised complication. The mainstay of management involves medical management with high-dose steroids and/or acetazolamide, repeated lumbar punctures, external ventricular drainage (EVD) or insertion of a ventriculoperitoneal shunt (VPS). Endoscopic third ventriculostomy (ETV) has only been used a handful of times to treat this type of hydrocephalus with controversial outcomes. Not much is known about this or the technical nuances of this procedure. We report our experience. METHODS All children who underwent ETV to treat hydrocephalus post CVD done for CM-1 were identified from a prospectively kept database. RESULTS Three children were identified (13F, 11F, 13F). The average time to presentation of hydrocephalus was 8 days after craniovertebral decompression. Two were successfully treated with ETV with brain imaging showing a reduction in the size of the ventricles post-operatively and not requiring any further cerebrospinal fluid drainage. In one patient, the procedure had to be abandoned after the peel away catheter was introduced into the right ventricle because CSF egressed under high pressure with ventricle walls collapse resulting in an obstructed view. This child ultimately required a VPS. CONCLUSION ETV can be used to successfully treat post CVD hydrocephalus in CM-1 patients depending on the aetiology of the hydrocephalus. There are technical and anatomical commonalities between these cases which make it more challenging than an ETV performed in "typical" obstructive hydrocephalus. We describe our experience and review the cases previously reported in the literature.
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Affiliation(s)
- Joshua Pepper
- Department of Neurosurgery, Birmingham Women's and Children's NHS Foundation Trust, Steelhouse Lane, Birmingham, B4 6NH, UK
| | - Desiderio Rodrigues
- Department of Neurosurgery, Birmingham Women's and Children's NHS Foundation Trust, Steelhouse Lane, Birmingham, B4 6NH, UK
| | - Pasquale Gallo
- Department of Neurosurgery, Birmingham Women's and Children's NHS Foundation Trust, Steelhouse Lane, Birmingham, B4 6NH, UK.
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Lawless J, McCormack O, Pepper J, McEvoy N, Bradley AL. Spectral Tuning of a Nanoparticle-on-Mirror System by Graphene Doping and Gap Control with Nitric Acid. ACS Appl Mater Interfaces 2023; 15:38901-38909. [PMID: 37534572 PMCID: PMC10436242 DOI: 10.1021/acsami.3c05302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Accepted: 07/24/2023] [Indexed: 08/04/2023]
Abstract
Nanoparticle-on-mirror systems are a stable, robust, and reproducible method of squeezing light into sub-nanometer volumes. Graphene is a particularly interesting material to use as a spacer in such systems as it is the thinnest possible 2D material and can be doped both chemically and electrically to modulate the plasmonic modes. We investigate a simple nanoparticle-on-mirror system, consisting of a Au nanosphere on top of an Au mirror, separated by a monolayer of graphene. With this system, we demonstrate, with both experiments and numerical simulations, how the doping of the graphene and the control of the gap size can be controlled to tune the plasmonic response of the coupled nanosphere using nitric acid. The coupling of the Au nanosphere and Au thin film reveals multipolar modes which can be tuned by adjusting the gap size or doping an intermediate graphene monolayer. At high doping levels, the interaction between the charge-transfer plasmon and gap plasmon leads to splitting of the plasmon energies. The study provides evidence for the unification of theories proposed by previous works investigating similar systems.
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Affiliation(s)
- Julia Lawless
- School
of Physics and AMBER, Trinity College Dublin, College Green, Dublin 2, Ireland
| | - Oisín McCormack
- School
of Physics and AMBER, Trinity College Dublin, College Green, Dublin 2, Ireland
| | - Joshua Pepper
- School
of Chemistry and AMBER, Trinity College
Dublin, College Green, Dublin 2, Ireland
| | - Niall McEvoy
- School
of Chemistry and AMBER, Trinity College
Dublin, College Green, Dublin 2, Ireland
| | - A. Louise Bradley
- School
of Physics and AMBER, Trinity College Dublin, College Green, Dublin 2, Ireland
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Zhu Y, Xu XY, Rosendahl U, Pepper J, Mirsadraee S. Advanced risk prediction for aortic dissection patients using imaging-based computational flow analysis. Clin Radiol 2023; 78:e155-e165. [PMID: 36610929 DOI: 10.1016/j.crad.2022.12.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Revised: 11/28/2022] [Accepted: 12/02/2022] [Indexed: 12/24/2022]
Abstract
Patients with either a repaired or medically managed aortic dissection have varying degrees of risk of developing late complications. High-risk patients would benefit from earlier intervention to improve their long-term survival. Currently serial imaging is used for risk stratification, which is not always reliable. On the other hand, understanding aortic haemodynamics within a dissection is essential to fully evaluate the disease and predict how it may progress. In recent decades, computational fluid dynamics (CFD) has been extensively applied to simulate complex haemodynamics within aortic diseases, and more recently, four-dimensional (4D)-flow magnetic resonance imaging (MRI) techniques have been developed for in vivo haemodynamic measurement. This paper presents a comprehensive review on the application of image-based CFD simulations and 4D-flow MRI analysis for risk prediction in aortic dissection. The key steps involved in patient-specific CFD analyses are demonstrated. Finally, we propose a workflow incorporating computational modelling for personalised assessment to aid in risk stratification and treatment decision-making.
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Affiliation(s)
- Y Zhu
- Department of Chemical Engineering, Imperial College London, London, UK
| | - X Y Xu
- Department of Chemical Engineering, Imperial College London, London, UK
| | - U Rosendahl
- Department of Cardiac Surgery, Royal Brompton and Harefield Hospitals, London, UK; National Heart and Lung Institute, Imperial College London, London, UK
| | - J Pepper
- Department of Cardiac Surgery, Royal Brompton and Harefield Hospitals, London, UK; National Heart and Lung Institute, Imperial College London, London, UK
| | - S Mirsadraee
- National Heart and Lung Institute, Imperial College London, London, UK; Department of Radiology, Royal Brompton and Harefield Hospitals, London, UK.
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Zisakis A, Sun R, Pepper J, Tsermoulas G. Chiari Malformation Type 1 in Adults. Adv Tech Stand Neurosurg 2023; 46:149-173. [PMID: 37318574 DOI: 10.1007/978-3-031-28202-7_8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
The term Chiari malformation refers to a heterogeneous group of anatomical abnormalities at the craniovertebral junction. Chiari malformation type 1 (CM1) refers to the abnormal protrusion of cerebellar tonsils through the foramen magnum and is by far the commonest type. Its prevalence is estimated approximately 1%; it is more common in women and is associated with syringomyelia in 25-70% of cases. The prevalent pathophysiological theory proposes a morphological mismatch between a small posterior cranial fossa and a normally developed hindbrain that results in ectopia of the tonsils.In most people, CM1 is asymptomatic and diagnosed incidentally. In symptomatic cases, headache is the cardinal symptom. The typical headache is induced by Valsalva-like maneuvers. Many of the other symptoms are nonspecific, and in the absence of syringomyelia, the natural history is benign. Syringomyelia manifests with spinal cord dysfunction of varying severity. The approach to patients with CM1 should be multidisciplinary, and the first step in the management is phenotyping the symptoms, because they may be due to other pathologies, like a primary headache syndrome. Magnetic resonance imaging, which shows cerebellar tonsillar decent 5 mm or more below the foramen magnum, is the gold standard investigative modality. The diagnostic workup may include dynamic imaging of the craniocervical junction and intracranial pressure monitoring.The management of CM1 is variable and sometimes controversial. Surgery is usually reserved for patients with disabling headaches or neurological deficits from the syrinx. Surgical decompression of the craniocervical junction is the most widely used procedure. Several surgical techniques have been proposed, but there is no consensus on the best treatment strategy, mainly due to lack of high-quality evidence. The management of the condition during pregnancy, restriction to lifestyle related to athletic activities, and the coexistence of hypermobility require special considerations.
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Affiliation(s)
- Athanasios Zisakis
- Department of Neurosurgery, Queen Elizabeth Hospital Birmingham, University Hospitals of Birmingham, Birmingham, UK
| | - Rosa Sun
- Department of Neurosurgery, Queen Elizabeth Hospital Birmingham, University Hospitals of Birmingham, Birmingham, UK
| | - Joshua Pepper
- Department of Neurosurgery, Queen Elizabeth Hospital Birmingham, University Hospitals of Birmingham, Birmingham, UK
| | - Georgios Tsermoulas
- Department of Neurosurgery, Queen Elizabeth Hospital Birmingham, University Hospitals of Birmingham, Birmingham, UK.
- Institute of Metabolism and Systems Research, University of Birmingham, Birmingham, UK.
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Pepper J, Lamin S, Thomas A, Walsh AR, Rodrigues D, Lo WB, Solanki GA. Clinical features and outcome in pediatric arteriovenous malformation: institutional multimodality treatment. Childs Nerv Syst 2022; 39:975-982. [PMID: 36580118 DOI: 10.1007/s00381-022-05800-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Accepted: 12/09/2022] [Indexed: 12/30/2022]
Abstract
PURPOSE Intracranial arteriovenous-malformation (AVM) is a relatively rare condition in pediatrics, yet is a major cause of spontaneous intracranial hemorrhage with a risk of fatal hemorrhage reported to be between 4 and 29%. Little is known about vessel morphology and optimum treatment modalities including multimodality combination therapy and prognosis in children. METHODS A retrospective review of all children presenting to our institution from 2006 to 2020 that had an AVM was undertaken. RESULTS A total of 50 children were identified with median age of 11 (range 1-16) years. The mean follow-up was 7.6 years. Forty-one children presented as an emergency and of those, 40 had hemorrhage identified on initial brain imaging. The average nidus size was 25 mm, drainage was superficial in 51% of cases, and located in eloquent cortex in 56%. The supplemental Spetzler-Martin grading indicated 78% (39/50) were grade 4 and above (moderate to high risk). Primary treatment modalities included embolization in 50% (25) or SRS in 30% (15) and surgery in 20% (10).The AVM was obliterated on follow-up DSA in 66% children. Three children had post-treatment hemorrhage, two related to embolization and one the day following SRS, giving a re-bleed rate of 6%. The GOSE was available for 32 children at long term follow and 94% had a good outcome (GOSE 5-8). Two children died due to acute hemorrhage (4%). CONCLUSION The majority of children with AVM present with hemorrhage. The rebleed rate during definitive treatment is low at 6% over the study period. The selective use of the 3 modalities of treatment has significantly reduced mortality and severe disability.
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Affiliation(s)
- Joshua Pepper
- Birmingham Women's & Children's Hospital, Birmingham, UK.
| | - Saleh Lamin
- Birmingham Women's & Children's Hospital, Birmingham, UK.,Queen Elizabeth Hospital, University Hospitals Birmingham, Birmingham, UK
| | - Allan Thomas
- Birmingham Women's & Children's Hospital, Birmingham, UK.,Queen Elizabeth Hospital, University Hospitals Birmingham, Birmingham, UK
| | | | | | - William B Lo
- Birmingham Women's & Children's Hospital, Birmingham, UK
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Coulden A, Pepper J, Juszczak A, Batra R, Chavda S, Senthil L, Ayuk J, Pohl U, Nagaraju S, Karavitaki N, Tsermoulas G. Rathke's Cleft Cyst Abscess with a Very Unusual Course. Asian J Neurosurg 2022; 17:527-531. [PMID: 36398168 PMCID: PMC9665969 DOI: 10.1055/s-0042-1750798] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Infected Rathke's cleft cysts (RCC) are extremely rare with only a few published cases. We report the case of a 31-year-old man who presented with headaches, visual disturbance, and hypopituitarism secondary to an infected RCC with extension of abscesses along the optic tract. Magnetic resonance imaging showed ring enhancing cystic lesions within an expanded sella with suprasellar and intraparenchymal extension. The radiological appearance suggested a high-grade optic glioma, but an endoscopic transsphenoidal biopsy revealed frank pus in the pituitary fossa, which subsequently grew
Staphylococcus aureus
. Pathological examination of the cyst wall showed an inflamed RCC. Following a prolonged course of intravenous antibiotics, the infection resolved and vision improved. RCC abscesses are rare and the intracranial extension of the infection in our case makes it unique.
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Affiliation(s)
- Amy Coulden
- Department of Endocrinology, Queen Elizabeth Hospital, Birmingham, United Kingdom
- Institute of Metabolism and Systems Research, College of Medical and Dental Sciences, University of Birmingham, United Kingdom
- Centre for Endocrinology, Diabetes and Metabolism, Birmingham Health Partners, Birmingham, United Kingdom
| | - Joshua Pepper
- Department of Neurosurgery, Queen Elizabeth Hospital, Birmingham, United Kingdom
| | - Agata Juszczak
- Department of Endocrinology, Birmingham Heartlands Hospital, Birmingham, United Kingdom
| | - Ruchika Batra
- Department of Ophthalmology, Queen Elizabeth Hospital, Birmingham, United Kingdom
| | - Swarupsinh Chavda
- Department of Radiology, Queen Elizabeth Hospital, Birmingham, United Kingdom
| | - Latha Senthil
- Department of Radiology, Queen Elizabeth Hospital, Birmingham, United Kingdom
| | - John Ayuk
- Department of Endocrinology, Queen Elizabeth Hospital, Birmingham, United Kingdom
- Centre for Endocrinology, Diabetes and Metabolism, Birmingham Health Partners, Birmingham, United Kingdom
| | - Ute Pohl
- Department of Cellular Pathology, Queen Elizabeth Hospital, Birmingham, United Kingdom
| | - Santhosh Nagaraju
- Department of Cellular Pathology, Queen Elizabeth Hospital, Birmingham, United Kingdom
| | - Niki Karavitaki
- Department of Endocrinology, Queen Elizabeth Hospital, Birmingham, United Kingdom
- Institute of Metabolism and Systems Research, College of Medical and Dental Sciences, University of Birmingham, United Kingdom
- Centre for Endocrinology, Diabetes and Metabolism, Birmingham Health Partners, Birmingham, United Kingdom
| | - Georgios Tsermoulas
- Institute of Metabolism and Systems Research, College of Medical and Dental Sciences, University of Birmingham, United Kingdom
- Department of Neurosurgery, Queen Elizabeth Hospital, Birmingham, United Kingdom
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8
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Pepper J, Lo WB, Agrawal S, Mohamed R, Horton J, Balloo S, Philip S, Basnet A, Wimalachandra WSB, Lawley A, Seri S, Walsh AR. Functional hemispherotomy for epilepsy in the very young. J Neurosurg Pediatr 2022; 30:1-10. [PMID: 35932273 DOI: 10.3171/2022.6.peds21521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/07/2021] [Accepted: 06/02/2022] [Indexed: 11/06/2022]
Abstract
OBJECTIVE Epilepsy is one of the most common neurological disorders in children. Among very young children, one-third are resistant to medical treatment, and lack of effective treatment may result in adverse outcomes. Although functional hemispherotomy is an established treatment for epilepsy, its outcome in the very young child has not been widely reported. In this study the authors investigated seizure and developmental results after hemispherotomy in children younger than 3 years. METHODS The authors reviewed a prospective database of all children younger than 3 years with medically intractable epilepsy who underwent functional hemispherotomy at the authors' institution during the period between 2012 and 2020. Demographic data, epilepsy history, underlying etiology, operative and transfusion details, and seizure and developmental outcomes were analyzed. RESULTS Twelve patients were included in this study. The mean age (± SD) at seizure onset was 3 ± 2.6 months and at surgery was 1.3 ± 0.77 years, with a mean follow-up of 4 years. Diagnoses included hemimegalencephaly (n = 5), hemidysplasia (n = 2), hypoxic/hemorrhagic (n = 2), traumatic (n = 1), Sturge-Weber syndrome (n = 1), and mild hemispheric structural abnormality with EEG/PET correlates (n = 1). Eleven patients achieved an Engel class I outcome, and 1 patient achieved Engel class IV at last follow-up. No deaths, infections, cerebrovascular events, or unexpected long-term neurological deficits were recorded. All children progressed neurodevelopmentally following surgery, but their developmental levels remained behind their chronological age, with an overall mean composite Vineland Adaptive Behavior Scale score of 58 (normal: 86-114, low: < 70). One patient required insertion of a subdural peritoneal shunt, 1 patient required dural repair for a CSF fluid leak, and 1 patient required aspiration of a pseudomeningocele. In 2 patients, both of whom weighed less than 5.7 kg, the first operation was incomplete due to blood loss. CONCLUSIONS Hemispherotomy in children younger than 3 years offers excellent seizure control and an acceptable risk-to-benefit ratio in well-selected patients. Families of children weighing less than 6 kg should be counseled regarding the possibility of staged surgery. Postoperatively, children continue to make appropriate, despite delayed, developmental progress.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | - Stefano Seri
- 4Department of Neurophysiology, Birmingham Children's Hospital, Birmingham, United Kingdom
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Pepper J, Cuthbert H, Scott T, Ughratdar I, Wykes V, Watts C, D'Urso P, Karabatsou K, Moor CC, Albanese E. Seizure Outcome After Surgery for Insular High-Grade Glioma. World Neurosurg 2021; 154:e718-e723. [PMID: 34343689 DOI: 10.1016/j.wneu.2021.07.114] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2021] [Accepted: 07/26/2021] [Indexed: 10/20/2022]
Abstract
BACKGROUND The insular cortex is an eloquent island of mesocortex surrounded by vital structures making this region relatively challenging to neurosurgeons. Historically, lesions in this region were considered too high risk to approach given the strong chance of poor surgical outcome. Advances in recent decades have meant that surgeons can more safely access this eloquent region. Seizure outcome after excision of insular low-grade gliomas is well reported, but little is known about seizure outcomes after excision of insular high-grade gliomas. METHODS A retrospective analysis was performed of all patients presenting with new-onset seizures during 2015-2019 who underwent excision of an insular high-grade glioma at 3 regional neurosurgical centers in the United Kingdom. RESULTS We identified 38 patients with a mean (SD) age of 45.7 (15.3) years with median follow-up of 21 months. At long-term follow-up, of 38 patients, 23 were seizure-free (Engel class I), 2 had improved seizures (Engel class II), 6 had poor seizure control (Engel class III/IV), and 7 died. CONCLUSIONS Excision of insular high-grade gliomas is safe and results in excellent postoperative seizure control.
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Affiliation(s)
- Joshua Pepper
- Department of Neurosurgery, University Hospital of North Midlands, Stoke on Trent, United Kingdom.
| | - Hadleigh Cuthbert
- Department of Neurosurgery, University Hospital of North Midlands, Stoke on Trent, United Kingdom
| | - Teresa Scott
- Department of Neurosurgery, Queen Elizabeth Hospital, Birmingham, United Kingdom
| | - Ismail Ughratdar
- Department of Neurosurgery, Queen Elizabeth Hospital, Birmingham, United Kingdom
| | - Victoria Wykes
- Department of Neurosurgery, Queen Elizabeth Hospital, Birmingham, United Kingdom
| | - Colin Watts
- Department of Neurosurgery, Queen Elizabeth Hospital, Birmingham, United Kingdom
| | - Pietro D'Urso
- Department of Neurosurgery, Salford Royal Hospital, Salford, United Kingdom
| | | | - Carl-Christian Moor
- Department of Neurology, University Hospital of North Midlands, Stoke on Trent, United Kingdom
| | - Erminia Albanese
- Department of Neurosurgery, University Hospital of North Midlands, Stoke on Trent, United Kingdom
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Cuthbert H, Pepper J, Price R. Spontaneous resolution of a Chiari malformation with syringomyelia. BMJ Case Rep 2021; 14:14/6/e241789. [PMID: 34155013 DOI: 10.1136/bcr-2021-241789] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
The Chiari I malformation (CM-I) is characterised by overcrowding of the posterior fossa and descent of the cerebellar tonsils and is associated with syringomyelia. With the increasing availability of magnetic resonance imaging, CM-I is placing a growing burden on neurosurgical services. However, its natural history remains poorly understood, and the timing and nature of surgical intervention is controversial. We present a case of a significant, symptomatic CM-I with associated syrinx which underwent complete spontaneous resolution over a 4-year period. Spontaneous regression of Chiari malformation and syringomyelia is exceedingly rare; a literature review reveals 15 other cases and only one case which underwent complete resolution. The present case and literature review suggest a more benign natural history of CM-I and support a more conservative approach to its management. Further studies are required to determine whether any factors can predict resolution for certain patient cohorts.
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Affiliation(s)
- Hadleigh Cuthbert
- Department of Neurosurgery, University Hospital of North Staffordshire NHS Trust, Stoke-on-Trent, UK
| | - Joshua Pepper
- Department of Neurosurgery, University Hospital of North Staffordshire NHS Trust, Stoke-on-Trent, UK
| | - Rupert Price
- Department of Neurosurgery, University Hospital of North Staffordshire NHS Trust, Stoke-on-Trent, UK
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11
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Pepper J, Elhabal A, Tsermoulas G, Flint G. Symptom outcome after craniovertebral decompression for Chiari type 1 malformation without syringomyelia. Acta Neurochir (Wien) 2021; 163:239-244. [PMID: 33130986 DOI: 10.1007/s00701-020-04631-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Accepted: 10/23/2020] [Indexed: 11/29/2022]
Abstract
BACKGROUND Specific symptom outcomes after craniovertebral decompression for patients with Chiari type 1 malformation, without accompanying syringomyelia, are not well characterised and poorly reported. METHODS We performed a retrospective review of all patients diagnosed with Chiari type 1, without syringomyelia, who underwent craniovertebral decompression in our unit. RESULTS We identified 129 individuals with a minimum of 2 years' follow-up. The most common pre-operative symptoms were pressure dissociation headaches (78%), visual disturbances (33%), dizziness/balance disturbances (24%) and blackouts (17%). The symptoms most likely to respond to surgery included Valsalva-induced headache (74% response, p < 0.0001) and blackouts (86% response, p < 0.001). CONCLUSIONS After successful craniovertebral decompression, most patients presenting with pressure dissociation headaches and blackouts will improve. However, the large variety of other symptoms patients often present with may not improve after surgery.
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Affiliation(s)
- Joshua Pepper
- Department of Neurosurgery, Queen Elizabeth Hospital, Edgbaston, Birmingham, B29 4AB, UK.
| | - Ahmed Elhabal
- Department of Neurosurgery, Queen Elizabeth Hospital, Edgbaston, Birmingham, B29 4AB, UK
| | - Georgios Tsermoulas
- Department of Neurosurgery, Queen Elizabeth Hospital, Edgbaston, Birmingham, B29 4AB, UK
| | - Graham Flint
- Department of Neurosurgery, Queen Elizabeth Hospital, Edgbaston, Birmingham, B29 4AB, UK
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12
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Salmasi M, Jarral O, Pirola S, Sasidharan S, Pepper J, Oo A, Moore Jr J, Xu X, Athanasiou T. In-vivo blood flow parameters can predict at-risk aortic aneurysms and dissection: a comprehensive biomechanics model. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.2339] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
Abnormal blood flow patterns can alter the material properties of the thoracic aorta via altered vascular biology and tissue biomechanics. In-vivo haemodynamic assessment of the aorta is yet to penetrate clinical practice due to our limited understanding of its effect on aortic wall properties. The decision for surgical treatment is based on size thresholds, limited to a single measurement of aortic diameter from routine imaging, although many aortic dissections (40–60%) occur below these size thresholds. This multi-centre study aims to assess the clinical utility of biomechanics principles in thoracic aortic aneurysm (TAA) risk rupture prediction using a substantial sample size.
Methods
Fifty-five patients undergoing surgery for root or ascending TAA were recruited from five cardiac centres. Bicuspid aortic valves and connective tissue disease were excluded from this study.Haemodynamic assessment Pre-operative 4-dimensional flow magnetic resonance imaging (4D-MRI) were conducted. Direct 4D-flow analysis and computational fluid dynamics (CFD) were performed creating detailed wall shear stress (WSS) maps across the whole aneurysms. Aortic wall assessment The aneurysmal aortic sample was obtained from surgery and subjected to region specific uniaxial failure tests in the circumferential and longitudinal directions, as well as delamination testing within the aortic media. Whole aneurysm histological characterisation was also conducted using computational pathology techniques. Blood flow, tissue mechanics and microstructural properties were used to develop a risk prediction model with assessment of elastin, collagen and smooth muscle cell composition, as well as failure strain assessment and dissection energy function.
Results
Outcomes of mechanical properties were: Young's Elastic Modulus as a measure of aortic stiffness (0.85 MPa ±0.69), as well as maximal tensile strength (0.49 MPa ± 0.36), which demonstrated reduced aortic wall strength in the outer curvature. This correlated with increased wall shear stress (WSS) (up to 10 Pa) and flow velocity (up to 43 l/min). Regions of abnormal flow and tissue mechanics correlated significantly with degraded medial microstructure (elastin abundance: 34 vs 66%; collagen abundance 26 vs 57%, p<0.05).
Conclusions
CFD modelling has the potential to provide a risk prediction of acute events in TAA beyond the current size classification, as validated by altered aortic tissue properties. Future longitudinal studies are warranted to validate this methods in moderately enlarging thoracic aortas.
Flow, mechanical, histology properties
Funding Acknowledgement
Type of funding source: Foundation. Main funding source(s): NIHR Imperial College BRC
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Affiliation(s)
- M Salmasi
- Imperial College London, London, United Kingdom
| | - O.A Jarral
- Imperial College London, London, United Kingdom
| | - S Pirola
- Imperial College London, London, United Kingdom
| | | | - J Pepper
- Royal Brompton and Harefield NHS Foundation Trust, London, United Kingdom
| | - A Oo
- Barts Heart Centre, London, United Kingdom
| | - J Moore Jr
- Imperial College London, London, United Kingdom
| | - X.Y Xu
- Imperial College London, London, United Kingdom
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13
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Pepper J, Scott T, Roylance A, Beckett R, Albanese E. On day admissions in neurosurgery: a comparative cohort study. Br J Neurosurg 2020; 36:16-18. [PMID: 33063534 DOI: 10.1080/02688697.2020.1834504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Day of admission neurosurgery is a viable method to reduce health care associated costs, complications and length of stay. Within the national health service in England the picture is very mixed with some neurosurgery centres universally admitting patients the day before and others admitting on the day of surgery.We altered our admissions policy during a 4 month time period from 'day-before' surgery to 'day-of' surgery for elective neurosurgery. A number of patients still continued to be admitted the day before surgery due to consultant choice. We conducted a comparative cohort study of these two patient groups to see if there were any differences in surgical cancellation rates, the reasons for these cancellations and the implied cost savings.In total 199 patients underwent neurosurgery during this time period, 87 patients were admitted on the 'day-of' and 112 patients on the 'day-before' surgery. The overall cancellation rate was 18%. The cancellation rate in patients admitted on the 'day-of' surgery was 12.6% (11/87). The rate of cancellation in patients admitted the 'day-before' surgery was 22.3% (25/112). This difference was not significant (p = 0.1). Day of surgery admission resulted in a cost saving of almost £30,000 in this group of patients over a 4 month period. If extrapolated for all patients over the course of a year it would result in cost savings in the region of £150,000.In summary, admitting elective neurosurgery patients on the day of surgery does not affect cancellation rates, prevents unnecessary overnight hospital admission and results in significant cost saving.
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Affiliation(s)
- Joshua Pepper
- Neurosurgery Department, University Hospital of North Midlands, Stoke on Trent, UK
| | - Teresa Scott
- Neurosurgery Department, University Hospital of North Midlands, Stoke on Trent, UK
| | - Anthony Roylance
- Neurosurgery Department, University Hospital of North Midlands, Stoke on Trent, UK
| | - Rebecca Beckett
- Neurosurgery Department, University Hospital of North Midlands, Stoke on Trent, UK
| | - Erminia Albanese
- Neurosurgery Department, University Hospital of North Midlands, Stoke on Trent, UK
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14
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Vanderburg A, Rappaport SA, Xu S, Crossfield IJM, Becker JC, Gary B, Murgas F, Blouin S, Kaye TG, Palle E, Melis C, Morris BM, Kreidberg L, Gorjian V, Morley CV, Mann AW, Parviainen H, Pearce LA, Newton ER, Carrillo A, Zuckerman B, Nelson L, Zeimann G, Brown WR, Tronsgaard R, Klein B, Ricker GR, Vanderspek RK, Latham DW, Seager S, Winn JN, Jenkins JM, Adams FC, Benneke B, Berardo D, Buchhave LA, Caldwell DA, Christiansen JL, Collins KA, Colón KD, Daylan T, Doty J, Doyle AE, Dragomir D, Dressing C, Dufour P, Fukui A, Glidden A, Guerrero NM, Guo X, Heng K, Henriksen AI, Huang CX, Kaltenegger L, Kane SR, Lewis JA, Lissauer JJ, Morales F, Narita N, Pepper J, Rose ME, Smith JC, Stassun KG, Yu L. A giant planet candidate transiting a white dwarf. Nature 2020; 585:363-367. [PMID: 32939071 DOI: 10.1038/s41586-020-2713-y] [Citation(s) in RCA: 67] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Accepted: 07/15/2020] [Indexed: 11/09/2022]
Abstract
Astronomers have discovered thousands of planets outside the Solar System1, most of which orbit stars that will eventually evolve into red giants and then into white dwarfs. During the red giant phase, any close-orbiting planets will be engulfed by the star2, but more distant planets can survive this phase and remain in orbit around the white dwarf3,4. Some white dwarfs show evidence for rocky material floating in their atmospheres5, in warm debris disks6-9 or orbiting very closely10-12, which has been interpreted as the debris of rocky planets that were scattered inwards and tidally disrupted13. Recently, the discovery of a gaseous debris disk with a composition similar to that of ice giant planets14 demonstrated that massive planets might also find their way into tight orbits around white dwarfs, but it is unclear whether these planets can survive the journey. So far, no intact planets have been detected in close orbits around white dwarfs. Here we report the observation of a giant planet candidate transiting the white dwarf WD 1856+534 (TIC 267574918) every 1.4 days. We observed and modelled the periodic dimming of the white dwarf caused by the planet candidate passing in front of the star in its orbit. The planet candidate is roughly the same size as Jupiter and is no more than 14 times as massive (with 95 per cent confidence). Other cases of white dwarfs with close brown dwarf or stellar companions are explained as the consequence of common-envelope evolution, wherein the original orbit is enveloped during the red giant phase and shrinks owing to friction. In this case, however, the long orbital period (compared with other white dwarfs with close brown dwarf or stellar companions) and low mass of the planet candidate make common-envelope evolution less likely. Instead, our findings for the WD 1856+534 system indicate that giant planets can be scattered into tight orbits without being tidally disrupted, motivating the search for smaller transiting planets around white dwarfs.
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Affiliation(s)
- Andrew Vanderburg
- Department of Astronomy, University of Wisconsin-Madison, Madison, WI, USA. .,Department of Astronomy, The University of Texas at Austin, Austin, TX, USA.
| | - Saul A Rappaport
- Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Siyi Xu
- NSF's NOIRLab/Gemini Observatory, Hilo, HI, USA
| | - Ian J M Crossfield
- Department of Physics and Astronomy, University of Kansas, Lawrence, KS, USA
| | - Juliette C Becker
- Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA
| | - Bruce Gary
- Hereford Arizona Observatory, Hereford, AZ, USA
| | - Felipe Murgas
- Instituto de Astrofísica de Canarias (IAC), Tenerife, Spain.,Departamento Astrofísica, Universidad de La Laguna (ULL), Tenerife, Spain
| | - Simon Blouin
- Los Alamos National Laboratory, Los Alamos, NM, USA
| | - Thomas G Kaye
- Raemor Vista Observatory, Sierra Vista, AZ, USA.,Laboratory for Space Research, The University of Hong Kong, Hong Kong, China
| | - Enric Palle
- Instituto de Astrofísica de Canarias (IAC), Tenerife, Spain.,Departamento Astrofísica, Universidad de La Laguna (ULL), Tenerife, Spain
| | - Carl Melis
- Center for Astrophysics and Space Sciences, University of California, San Diego, San Diego, CA, USA
| | - Brett M Morris
- Center for Space and Habitability, University of Bern, Bern, Switzerland
| | - Laura Kreidberg
- Max Planck Institute for Astronomy, Heidelberg, Germany.,Center for Astrophysics
- Harvard & Smithsonian, Cambridge, MA, USA
| | - Varoujan Gorjian
- NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | - Caroline V Morley
- Department of Astronomy, The University of Texas at Austin, Austin, TX, USA
| | - Andrew W Mann
- Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Hannu Parviainen
- Instituto de Astrofísica de Canarias (IAC), Tenerife, Spain.,Departamento Astrofísica, Universidad de La Laguna (ULL), Tenerife, Spain
| | - Logan A Pearce
- Steward Observatory, University of Arizona, Tucson, AZ, USA
| | - Elisabeth R Newton
- Department of Physics and Astronomy, Dartmouth College, Hanover, NH, USA
| | - Andreia Carrillo
- Department of Astronomy, The University of Texas at Austin, Austin, TX, USA
| | - Ben Zuckerman
- Department of Physics and Astronomy, University of California, Los Angeles, Los Angeles, CA, USA
| | - Lorne Nelson
- Department of Physics and Astronomy, Bishop's University, Sherbrooke, Quebec, Canada
| | - Greg Zeimann
- Hobby-Eberly Telescope, University of Texas, Austin, Austin, TX, USA
| | - Warren R Brown
- Center for Astrophysics
- Harvard & Smithsonian, Cambridge, MA, USA
| | - René Tronsgaard
- DTU Space, National Space Institute, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Beth Klein
- Department of Physics and Astronomy, University of California, Los Angeles, Los Angeles, CA, USA
| | - George R Ricker
- Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Roland K Vanderspek
- Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - David W Latham
- Center for Astrophysics
- Harvard & Smithsonian, Cambridge, MA, USA
| | - Sara Seager
- Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA, USA.,Department of Earth and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA.,Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Joshua N Winn
- Department of Astrophysical Sciences, Princeton University, Princeton, NJ, USA
| | | | - Fred C Adams
- Physics Department, University of Michigan, Ann Arbor, MI, USA.,Astronomy Department, University of Michigan, Ann Arbor, MI, USA
| | - Björn Benneke
- Départment de Physique, Université de Montréal, Montreal, Quebec, Canada.,Institut de Recherche sur les Exoplanètes (iREx), Université de Montréal, Montreal, Quebec, Canada
| | - David Berardo
- Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Lars A Buchhave
- DTU Space, National Space Institute, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Douglas A Caldwell
- NASA Ames Research Center, Moffett Field, CA, USA.,SETI Institute, Mountain View, CA, USA
| | | | - Karen A Collins
- Center for Astrophysics
- Harvard & Smithsonian, Cambridge, MA, USA
| | - Knicole D Colón
- Exoplanets and Stellar Astrophysics Laboratory (Code 667), NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - Tansu Daylan
- Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA, USA
| | | | - Alexandra E Doyle
- Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, Los Angeles, CA, USA
| | - Diana Dragomir
- Department of Physics and Astronomy, University of New Mexico, Albuquerque, NM, USA
| | - Courtney Dressing
- Department of Astronomy, University of California, Berkeley, Berkeley, CA, USA
| | - Patrick Dufour
- Départment de Physique, Université de Montréal, Montreal, Quebec, Canada.,Institut de Recherche sur les Exoplanètes (iREx), Université de Montréal, Montreal, Quebec, Canada
| | - Akihiko Fukui
- Instituto de Astrofísica de Canarias (IAC), Tenerife, Spain.,Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Tokyo, Japan
| | - Ana Glidden
- Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA, USA.,Department of Earth and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Natalia M Guerrero
- Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Xueying Guo
- Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Kevin Heng
- Center for Space and Habitability, University of Bern, Bern, Switzerland
| | - Andreea I Henriksen
- DTU Space, National Space Institute, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Chelsea X Huang
- Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Lisa Kaltenegger
- Carl Sagan Institute, Cornell University, Ithaca, NY, USA.,Department of Astronomy and Space Sciences, Ithaca, NY, USA
| | - Stephen R Kane
- Department of Earth and Planetary Sciences, University of California, Riverside, Riverside, CA, USA
| | - John A Lewis
- Center for Astrophysics
- Harvard & Smithsonian, Cambridge, MA, USA
| | | | - Farisa Morales
- NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA.,Department of Physics and Astronomy, Moorpark College, Moorpark, CA, USA
| | - Norio Narita
- Instituto de Astrofísica de Canarias (IAC), Tenerife, Spain.,Astrobiology Center, Tokyo, Japan.,PRESTO, JST, Tokyo, Japan.,National Astronomical Observatory of Japan, Tokyo, Japan.,Komaba Institute for Science, The University of Tokyo, Tokyo, Japan
| | - Joshua Pepper
- Department of Physics, Lehigh University, Bethlehem, PA, USA
| | - Mark E Rose
- NASA Ames Research Center, Moffett Field, CA, USA
| | - Jeffrey C Smith
- NASA Ames Research Center, Moffett Field, CA, USA.,SETI Institute, Mountain View, CA, USA
| | - Keivan G Stassun
- Department of Physics and Astronomy, Vanderbilt University, Nashville, TN, USA.,Department of Physics, Fisk University, Nashville, TN, USA
| | - Liang Yu
- Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA, USA.,ExxonMobil Upstream Integrated Solutions, Spring, TX, USA
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15
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Lyon AR, Babalis D, Morley-Smith AC, Hedger M, Suarez Barrientos A, Foldes G, Couch LS, Chowdhury RA, Tzortzis KN, Peters NS, Rog-Zielinska EA, Yang HY, Welch S, Bowles CT, Rahman Haley S, Bell AR, Rice A, Sasikaran T, Johnson NA, Falaschetti E, Parameshwar J, Lewis C, Tsui S, Simon A, Pepper J, Rudy JJ, Zsebo KM, Macleod KT, Terracciano CM, Hajjar RJ, Banner N, Harding SE. Investigation of the safety and feasibility of AAV1/SERCA2a gene transfer in patients with chronic heart failure supported with a left ventricular assist device - the SERCA-LVAD TRIAL. Gene Ther 2020; 27:579-590. [PMID: 32669717 PMCID: PMC7744277 DOI: 10.1038/s41434-020-0171-7] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Revised: 01/05/2020] [Accepted: 06/25/2020] [Indexed: 01/16/2023]
Abstract
The SERCA-LVAD trial was a phase 2a trial assessing the safety and feasibility of delivering an adeno-associated vector 1 carrying the cardiac isoform of the sarcoplasmic reticulum calcium ATPase (AAV1/SERCA2a) to adult chronic heart failure patients implanted with a left ventricular assist device. The SERCA-LVAD trial was one of a program of AAV1/SERCA2a cardiac gene therapy trials including CUPID1, CUPID 2 and AGENT trials. Enroled subjects were randomised to receive a single intracoronary infusion of 1 × 1013 DNase-resistant AAV1/SERCA2a particles or a placebo solution in a double-blinded design, stratified by presence of neutralising antibodies to AAV. Elective endomyocardial biopsy was performed at 6 months unless the subject had undergone cardiac transplantation, with myocardial samples assessed for the presence of exogenous viral DNA from the treatment vector. Safety assessments including ELISPOT were serially performed. Although designed as a 24 subject trial, recruitment was stopped after five subjects had been randomised and received infusion due to the neutral result from the CUPID 2 trial. Here we describe the results from the 5 patients at 3 years follow up, which confirmed that viral DNA was delivered to the failing human heart in 2 patients receiving gene therapy with vector detectable at follow up endomyocardial biopsy or cardiac transplantation. Absolute levels of detectable transgene DNA were low, and no functional benefit was observed. There were no safety concerns in this small cohort. This trial identified some of the challenges of performing gene therapy trials in this LVAD patient cohort which may help guide future trial design.
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Affiliation(s)
- A R Lyon
- National Heart and Lung Institute, Imperial College London, London, UK. .,NIHR Cardiovascular Biomedical Research Unit, Royal Brompton and Harefield Hospitals NHS Trust, London, UK.
| | - D Babalis
- Imperial Clinical Trials Unit (ICTU), School of Public Health, Imperial College London, London, UK
| | - A C Morley-Smith
- National Heart and Lung Institute, Imperial College London, London, UK.,NIHR Cardiovascular Biomedical Research Unit, Royal Brompton and Harefield Hospitals NHS Trust, London, UK
| | - M Hedger
- NIHR Cardiovascular Biomedical Research Unit, Royal Brompton and Harefield Hospitals NHS Trust, London, UK
| | - A Suarez Barrientos
- NIHR Cardiovascular Biomedical Research Unit, Royal Brompton and Harefield Hospitals NHS Trust, London, UK
| | - G Foldes
- National Heart and Lung Institute, Imperial College London, London, UK
| | - L S Couch
- National Heart and Lung Institute, Imperial College London, London, UK
| | - R A Chowdhury
- National Heart and Lung Institute, Imperial College London, London, UK
| | - K N Tzortzis
- National Heart and Lung Institute, Imperial College London, London, UK
| | - N S Peters
- National Heart and Lung Institute, Imperial College London, London, UK
| | - E A Rog-Zielinska
- National Heart and Lung Institute, Imperial College London, London, UK.,Institute for Experimental Cardiovascular Medicine, University Heart Center, Medical Center, University of Freiburg, Freiburg, Germany
| | - H-Y Yang
- National Heart and Lung Institute, Imperial College London, London, UK
| | - S Welch
- National Heart and Lung Institute, Imperial College London, London, UK.,NIHR Cardiovascular Biomedical Research Unit, Royal Brompton and Harefield Hospitals NHS Trust, London, UK
| | - C T Bowles
- NIHR Cardiovascular Biomedical Research Unit, Royal Brompton and Harefield Hospitals NHS Trust, London, UK
| | - S Rahman Haley
- NIHR Cardiovascular Biomedical Research Unit, Royal Brompton and Harefield Hospitals NHS Trust, London, UK
| | - A R Bell
- Department of Histopathology, Royal Brompton and Harefield Hospitals NHS Trust, Freiburg, Germany
| | - A Rice
- Department of Histopathology, Royal Brompton and Harefield Hospitals NHS Trust, Freiburg, Germany
| | - T Sasikaran
- Imperial Clinical Trials Unit (ICTU), School of Public Health, Imperial College London, London, UK
| | - N A Johnson
- Imperial Clinical Trials Unit (ICTU), School of Public Health, Imperial College London, London, UK
| | - E Falaschetti
- Imperial Clinical Trials Unit (ICTU), School of Public Health, Imperial College London, London, UK
| | | | - C Lewis
- Royal Papworth Hospital NHS Trust, Cambridge, UK
| | - S Tsui
- Royal Papworth Hospital NHS Trust, Cambridge, UK
| | - A Simon
- National Heart and Lung Institute, Imperial College London, London, UK.,NIHR Cardiovascular Biomedical Research Unit, Royal Brompton and Harefield Hospitals NHS Trust, London, UK
| | - J Pepper
- National Heart and Lung Institute, Imperial College London, London, UK.,NIHR Cardiovascular Biomedical Research Unit, Royal Brompton and Harefield Hospitals NHS Trust, London, UK
| | - J J Rudy
- Celladon Corporation, San Diego, CA, USA
| | - K M Zsebo
- Celladon Corporation, San Diego, CA, USA
| | - K T Macleod
- National Heart and Lung Institute, Imperial College London, London, UK
| | - C M Terracciano
- National Heart and Lung Institute, Imperial College London, London, UK
| | - R J Hajjar
- Phospholamban Foundation, Amsterdam, Netherlands
| | - N Banner
- NIHR Cardiovascular Biomedical Research Unit, Royal Brompton and Harefield Hospitals NHS Trust, London, UK
| | - S E Harding
- National Heart and Lung Institute, Imperial College London, London, UK
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16
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Plavchan P, Barclay T, Gagné J, Gao P, Cale B, Matzko W, Dragomir D, Quinn S, Feliz D, Stassun K, Crossfield IJM, Berardo DA, Latham DW, Tieu B, Anglada-Escudé G, Ricker G, Vanderspek R, Seager S, Winn JN, Jenkins JM, Rinehart S, Krishnamurthy A, Dynes S, Doty J, Adams F, Afanasev DA, Beichman C, Bottom M, Bowler BP, Brinkworth C, Brown CJ, Cancino A, Ciardi DR, Clampin M, Clark JT, Collins K, Davison C, Foreman-Mackey D, Furlan E, Gaidos EJ, Geneser C, Giddens F, Gilbert E, Hall R, Hellier C, Henry T, Horner J, Howard AW, Huang C, Huber J, Kane SR, Kenworthy M, Kielkopf J, Kipping D, Klenke C, Kruse E, Latouf N, Lowrance P, Mennesson B, Mengel M, Mills SM, Morton T, Narita N, Newton E, Nishimoto A, Okumura J, Palle E, Pepper J, Quintana EV, Roberge A, Roccatagliata V, Schlieder JE, Tanner A, Teske J, Tinney CG, Vanderburg A, von Braun K, Walp B, Wang J, Wang SX, Weigand D, White R, Wittenmyer RA, Wright DJ, Youngblood A, Zhang H, Zilberman P. A planet within the debris disk around the pre-main-sequence star AU Microscopii. Nature 2020; 582:497-500. [PMID: 32581383 PMCID: PMC7323865 DOI: 10.1038/s41586-020-2400-z] [Citation(s) in RCA: 82] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2019] [Accepted: 03/17/2020] [Indexed: 11/09/2022]
Affiliation(s)
- Peter Plavchan
- Department of Physics and Astronomy, George Mason University, Fairfax, VA, USA.
| | - Thomas Barclay
- Center for Space Sciences and Technology, University of Maryland Baltimore County (UMBC), Baltimore, MD, USA.,Exoplanets and Stellar Astrophysics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - Jonathan Gagné
- Institute for Research on Exoplanets, Département de Physique, Université de Montréal, Montréal, Quebec, Canada
| | - Peter Gao
- Department of Astronomy, University of California, Berkeley, CA, USA
| | - Bryson Cale
- Department of Physics and Astronomy, George Mason University, Fairfax, VA, USA
| | - William Matzko
- Department of Physics and Astronomy, George Mason University, Fairfax, VA, USA
| | - Diana Dragomir
- Massachusetts Institute of Technology, Cambridge, MA, USA.,Department of Physics and Astronomy, University of New Mexico, Albuquerque, NM, USA
| | - Sam Quinn
- Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, USA
| | - Dax Feliz
- Department of Physics and Astronomy, Vanderbilt University, Nashville, TN, USA
| | - Keivan Stassun
- Department of Physics and Astronomy, Vanderbilt University, Nashville, TN, USA
| | - Ian J M Crossfield
- Massachusetts Institute of Technology, Cambridge, MA, USA.,Department of Physics and Astronomy, University of Kansas, Lawrence, KS, USA
| | | | - David W Latham
- Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, USA
| | - Ben Tieu
- Department of Physics and Astronomy, George Mason University, Fairfax, VA, USA
| | | | - George Ricker
- Massachusetts Institute of Technology, Cambridge, MA, USA
| | | | - Sara Seager
- Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Joshua N Winn
- Department of Astrophysical Sciences, Princeton University, Princeton, NJ, USA
| | | | - Stephen Rinehart
- Exoplanets and Stellar Astrophysics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | | | - Scott Dynes
- Massachusetts Institute of Technology, Cambridge, MA, USA
| | - John Doty
- Exoplanets and Stellar Astrophysics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - Fred Adams
- Department of Astronomy, University of Michigan, Ann Arbor, MI, USA
| | - Dennis A Afanasev
- Exoplanets and Stellar Astrophysics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - Chas Beichman
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA.,NASA Exoplanet Science Institute, California Institute of Technology, Pasadena, CA, USA
| | - Mike Bottom
- Institute for Astronomy, University of Hawaii at Manoa, Honolulu, HI, USA
| | - Brendan P Bowler
- Department of Astronomy, University of Texas at Austin, Austin, TX, USA
| | | | - Carolyn J Brown
- University of Southern Queensland, Centre for Astrophysics, Toowoomba, Queensland, Australia
| | - Andrew Cancino
- Department of Physics, Astronomy and Materials Science, Missouri State University, Springfield, MO, USA
| | - David R Ciardi
- NASA Exoplanet Science Institute, California Institute of Technology, Pasadena, CA, USA
| | - Mark Clampin
- Exoplanets and Stellar Astrophysics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - Jake T Clark
- University of Southern Queensland, Centre for Astrophysics, Toowoomba, Queensland, Australia
| | - Karen Collins
- Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, USA
| | - Cassy Davison
- Department of Physics and Astronomy, Georgia State University, Atlanta, GA, USA
| | | | - Elise Furlan
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | - Eric J Gaidos
- Department of Earth Sciences, University of Hawaii at Manoa, Honolulu, HI, USA
| | - Claire Geneser
- Department of Physics and Astronomy, Mississippi State University, Starkville, MS, USA
| | - Frank Giddens
- Department of Physics, Astronomy and Materials Science, Missouri State University, Springfield, MO, USA
| | - Emily Gilbert
- Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL, USA
| | - Ryan Hall
- Department of Physics and Astronomy, Georgia State University, Atlanta, GA, USA
| | | | | | - Jonathan Horner
- University of Southern Queensland, Centre for Astrophysics, Toowoomba, Queensland, Australia
| | - Andrew W Howard
- Department of Astronomy, California Institute of Technology, Pasadena, CA, USA
| | - Chelsea Huang
- Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Joseph Huber
- Department of Physics, Astronomy and Materials Science, Missouri State University, Springfield, MO, USA
| | - Stephen R Kane
- Department of Earth and Planetary Sciences, University of California, Riverside, CA, USA
| | | | - John Kielkopf
- Department of Physics and Astronomy, University of Louisville, Louisville, KY, USA
| | - David Kipping
- Department of Astronomy, Columbia University, New York, NY, USA
| | - Chris Klenke
- Department of Physics, Astronomy and Materials Science, Missouri State University, Springfield, MO, USA
| | - Ethan Kruse
- Exoplanets and Stellar Astrophysics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - Natasha Latouf
- Department of Physics and Astronomy, George Mason University, Fairfax, VA, USA
| | | | - Bertrand Mennesson
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | - Matthew Mengel
- University of Southern Queensland, Centre for Astrophysics, Toowoomba, Queensland, Australia
| | - Sean M Mills
- Department of Astronomy, California Institute of Technology, Pasadena, CA, USA
| | - Tim Morton
- Astronomy Department, University of Florida, Gainesville, FL, USA
| | - Norio Narita
- Department of Astronomy, The University of Tokyo, Tokyo, Japan.,JST, PRESTO, Tokyo, Japan.,Astrobiology Center, NINS, Tokyo, Japan.,National Astronomical Observatory of Japan, NINS, Tokyo, Japan.,Instituto de Astrofisica de Canarias (IAC), La Laguna, Tenerife, Spain
| | - Elisabeth Newton
- Department of Physics and Astronomy, Dartmouth College, Hanover, NH, USA
| | - America Nishimoto
- Department of Physics, Astronomy and Materials Science, Missouri State University, Springfield, MO, USA
| | - Jack Okumura
- University of Southern Queensland, Centre for Astrophysics, Toowoomba, Queensland, Australia
| | - Enric Palle
- Instituto de Astrofisica de Canarias (IAC), La Laguna, Tenerife, Spain
| | - Joshua Pepper
- Department of Physics, Lehigh University, Bethlehem, PA, USA
| | - Elisa V Quintana
- Exoplanets and Stellar Astrophysics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - Aki Roberge
- Exoplanets and Stellar Astrophysics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - Veronica Roccatagliata
- Dipartimento di Fisica "Enrico Fermi", Universita' di Pisa, Pisa, Italy.,INAF-Osservatorio Astrofisico di Arcetri, Firenze, Italy.,INFN, Sezione di Pisa, Pisa, Italy
| | - Joshua E Schlieder
- Exoplanets and Stellar Astrophysics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - Angelle Tanner
- Department of Physics and Astronomy, Mississippi State University, Starkville, MS, USA
| | - Johanna Teske
- Observatories of the Carnegie Institution for Science, Pasadena, CA, USA
| | - C G Tinney
- Exoplanetary Science at UNSW, School of Physics, UNSW Sydney, New South Wales, Australia
| | - Andrew Vanderburg
- Department of Astronomy, University of Texas at Austin, Austin, TX, USA
| | | | - Bernie Walp
- NASA Infrared Telescope Facility, Hilo, HI, USA
| | - Jason Wang
- Department of Astronomy, University of California, Berkeley, CA, USA.,Department of Astronomy, California Institute of Technology, Pasadena, CA, USA
| | | | - Denise Weigand
- Department of Physics, Astronomy and Materials Science, Missouri State University, Springfield, MO, USA
| | - Russel White
- Department of Physics and Astronomy, Georgia State University, Atlanta, GA, USA
| | - Robert A Wittenmyer
- University of Southern Queensland, Centre for Astrophysics, Toowoomba, Queensland, Australia
| | - Duncan J Wright
- University of Southern Queensland, Centre for Astrophysics, Toowoomba, Queensland, Australia
| | - Allison Youngblood
- Exoplanets and Stellar Astrophysics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - Hui Zhang
- School of Astronomy and Space Science, Key Laboratory of Ministry of Education, Nanjing University, Nanjing, China
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17
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Kunnel Jomon M, Pepper J, O'Connor N, Price R. Regression of a spinal schwannoma after Pomalidomide. Br J Neurosurg 2020:1-2. [PMID: 32188281 DOI: 10.1080/02688697.2020.1742292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
A 77-year old female with a history of neurofibromatosis type 2 (NF2) was diagnosed with a spinal schwannoma that was managed conservatively over a decade. During this time, follow up imaging revealed this lesion had been growing and the patient had become symptomatic from it necessitating surgical decompression. However, the patient had been diagnosed with multiple myeloma and underwent treatment with Pomalidomide chemotherapy which delayed surgery for the spinal schwannoma. Further imaging of the spine revealed significant regression in the size of the spinal schwannoma. This phenomenon has not previously been reported and this report aims to explore the implications of Pomalidomide in patients with NF2 related spinal schwannomas.
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Affiliation(s)
- Mathew Kunnel Jomon
- Neurosurgery Department, University Hospital of North Midlands, Stoke on Trent, UK
| | - Joshua Pepper
- Neurosurgery Department, University Hospital of North Midlands, Stoke on Trent, UK
| | - Nigel O'Connor
- Haematology Department, Royal Shrewsbury Hospital, Shrewsbury, UK
| | - Rupert Price
- Neurosurgery Department, University Hospital of North Midlands, Stoke on Trent, UK
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18
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Pepper J, Zrinzo L, Hariz M. Anterior capsulotomy for obsessive-compulsive disorder: a review of old and new literature. J Neurosurg 2019; 133:1-10. [PMID: 31604328 DOI: 10.3171/2019.4.jns19275] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Accepted: 04/29/2019] [Indexed: 12/16/2022]
Abstract
Over the last two decades, deep brain stimulation (DBS) has gained popularity as a treatment of severe and medically refractory obsessive-compulsive disorder (OCD), often using brain targets informed by historical lesional neurosurgical procedures. Paradoxically, the use of DBS in OCD has led some multidisciplinary teams to revisit the use of lesional procedures, especially anterior capsulotomy (AC), although significant aversion still exists toward the use of lesional neurosurgery for psychiatric disorders. This paper aims to review all literature on the use of AC for OCD to examine its effectiveness and safety profile.All publications on AC for OCD were searched. In total 512 patients were identified in 25 publications spanning 1961-2018. In papers where a Yale-Brown Obsessive Compulsive Scale (Y-BOCS) score was available, 73% of patients had a clinical response (i.e., > 35% improvement in Y-BOCS score) and 24% patients went into remission (Y-BOCS score < 8). In the older publications, published when the Y-BOCS was not yet available, 90% of patients were deemed to have had a significant clinical response and 39% of patients were considered symptom free. The rate of serious complications was low.In summary, AC is a safe, well-tolerated, and efficacious therapy. Its underuse is likely a result of historical prejudice rather than lack of clinical effectiveness.
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Affiliation(s)
- Joshua Pepper
- 1Department of Neurosurgery, Queen Elizabeth Hospital, Birmingham, United Kingdom
| | - Ludvic Zrinzo
- 2Unit of Functional Neurosurgery, Queen Square, London, United Kingdom; and
| | - Marwan Hariz
- 3Department of Clinical Neuroscience, Umeå University, Umeå, Sweden
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Abstract
This article was migrated. The article was marked as recommended. Longitudinal integrated clerkships (LICs) are a curricular structure for medical clerkships grounded in continuity across learning environments and experiences. There has yet to be a peer-reviewed article directly advising students in LIC programs. Twelve tips were created based on a comprehensive literature review of LICs and supported by the cumulative experience of the authors. They are ordered in four sequential groups: The first three tips discuss the importance of the relationships that are built between students and their patients (Tip 1), preceptors (Tip 2), and peers (Tip 3). Next we cover health systems, and offer advice on how students can integrate their learning (Tip 4), use technology to their advantage (Tip 5), and practice systems thinking (Tip 6). We then discuss the educational benefits when students take an active role in patient care (Tip 7), their own learning (Tip 8), and the feedback process (Tip 9). Finally, we cover the importance of self-care (Tip 10), reflection (Tip 11) and patience (Tip 12) during a LIC. These tips are designed to help students understand the pedagogical theory that underpins LICs, take an active role in their education, and maximize learning and wellness during their clerkship.
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20
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Gambaro A, Murphy MO, Duncan A, Pepper J, Quarto C, Rosendahl U, Moat N, Asimakopoulos G. P5471Stroke volume index of sutureless, trans-catheter and stented pericardial valves in the early postoperative period - A propensity matched analysis. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy566.p5471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- A Gambaro
- Royal Brompton Hospital, London, United Kingdom
| | - M O Murphy
- Royal Brompton Hospital, London, United Kingdom
| | - A Duncan
- Royal Brompton Hospital, London, United Kingdom
| | - J Pepper
- Royal Brompton Hospital, London, United Kingdom
| | - C Quarto
- Royal Brompton Hospital, London, United Kingdom
| | - U Rosendahl
- Royal Brompton Hospital, London, United Kingdom
| | - N Moat
- Royal Brompton Hospital, London, United Kingdom
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Vandenbriele C, Bhudia N, Dhillon E, Doyle J, Laffan MA, Ledot S, Morgan C, Murfin B, Passariello M, Patel B, Pepper J, Price S, Singh S, Trimlett R, Arachchillage DRJ. P1747Heparin anti-Xa assay versus Activated Partial Thromboplastin Time to monitor unfractionated heparin during Extra-Corporeal-Membrane-Oxygenation. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.p1747] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- C Vandenbriele
- Royal Brompton Hospital, Adult Intensive Care, London, United Kingdom
| | - N Bhudia
- Harefield Hospital, Adult Intensive Care, London, United Kingdom
| | - E Dhillon
- Royal Brompton Hospital, Adult Intensive Care, London, United Kingdom
| | - J Doyle
- Royal Brompton Hospital, Adult Intensive Care, London, United Kingdom
| | - M A Laffan
- Imperial College Healthcare NHS Trust, Haematology, London, United Kingdom
| | - S Ledot
- Royal Brompton Hospital, Adult Intensive Care, London, United Kingdom
| | - C Morgan
- Royal Brompton Hospital, Adult Intensive Care, London, United Kingdom
| | - B Murfin
- Royal Brompton Hospital, Adult Intensive Care, London, United Kingdom
| | - M Passariello
- Royal Brompton Hospital, Adult Intensive Care, London, United Kingdom
| | - B Patel
- Royal Brompton Hospital, Adult Intensive Care, London, United Kingdom
| | - J Pepper
- Royal Brompton Hospital, Department of Surgery, London, United Kingdom
| | - S Price
- Royal Brompton Hospital, Adult Intensive Care, London, United Kingdom
| | - S Singh
- Royal Brompton Hospital, Adult Intensive Care, London, United Kingdom
| | - R Trimlett
- Royal Brompton Hospital, Department of Surgery, London, United Kingdom
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Layton G, McKay S, Waqar H, Pepper J. Early exposure to surgical simulation can positively impact a medical student’s decision to enter a career in surgery. Int J Surg 2018. [DOI: 10.1016/j.ijsu.2018.05.474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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23
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Pepper J, Flint G. Case report: Development of syringomyelia after anatomically successful craniovertebral decompression for Chiari I malformation without syrinx. Br J Neurosurg 2018; 36:86-87. [DOI: 10.1080/02688697.2018.1466997] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Joshua Pepper
- Department of Neurosurgery, Queen Elizabeth Hospital, Birmingham, UK
| | - Graham Flint
- Department of Neurosurgery, Queen Elizabeth Hospital, Birmingham, UK
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24
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Martioli E, Colón KD, Angerhausen D, Stassun KG, Rodriguez JE, Zhou G, Gaudi BS, Pepper J, Beatty TG, Tata R, James DJ, Eastman JD, Wilson PA, Bayliss D, Stevens DJ. A survey of eight hot Jupiters in secondary eclipse using WIRCam at CFHT. Mon Not R Astron Soc 2018; 474:4264-4277. [PMID: 30344345 PMCID: PMC6190681 DOI: 10.1093/mnras/stx3009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We present near infrared high-precision photometry for eight transiting hot Jupiters observed during their predicted secondary eclipses. Our observations were carried out using the staring mode of the WIRCam instrument on the Canada-France-Hawaii Telescope (CFHT). We present the observing strategies and data reduction methods which delivered time series photometry with statistical photometric precision as low as 0.11%. We performed a Bayesian analysis to model the eclipse parameters and systematics simultaneously. The measured planet-to-star flux ratios allowed us to constrain the thermal emission from the day side of these hot Jupiters, as we derived the planet brightness temperatures. Our results combined with previously observed eclipses reveal an excess in the brightness temperatures relative to the blackbody prediction for the equilibrium temperatures of the planets for a wide range of heat redistribution factors. We find a trend that this excess appears to be larger for planets with lower equilibrium temperatures. This may imply some additional sources of radiation, such as reflected light from the host star and/or thermal emission from residual internal heat from the formation of the planet.
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Affiliation(s)
- Eder Martioli
- Laboratório Nacional de Astrofísica (LNA/MCTI), Rua Estados Unidos 154, Itajubá, MG, Brazil
| | - Knicole D. Colón
- NASA Ames Research Center, M/S 244-30, Mo ett Field, CA 94035, USA
- Bay Area Environmental Research Institute, 625 2nd St. Ste 209 Petaluma, CA 94952, USA
- NASA Goddard Space Flight Center, Exoplanets and Stellar Astrophysics Laboratory (Code 667), Greenbelt, MD 20771, USA
| | - Daniel Angerhausen
- USRA NASA Postdoctoral Program Fellow, NASA Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, MD 20771, USA
- Center for Space and Habitability, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland
| | - Keivan G. Stassun
- Department of Physics and Astronomy, Vanderbilt University, 6301 Stevenson Center, Nashville, TN 37235, USA
- Department of Physics, Fisk University, Nashville, TN 37208, USA
| | - Joseph E. Rodriguez
- Department of Physics and Astronomy, Vanderbilt University, 6301 Stevenson Center, Nashville, TN 37235, USA
- Harvard-Smithsonian Center for Astrophysics, 60 Garden St, Cambridge, MA 02138, USA
| | - George Zhou
- Harvard-Smithsonian Center for Astrophysics, 60 Garden St, Cambridge, MA 02138, USA
| | - B. Scott Gaudi
- Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA
| | - Joshua Pepper
- Department of Physics, Lehigh University, 16 Memorial Drive East, Bethlehem, PA 18015, USA
| | - Thomas G. Beatty
- Department of Astronomy & Astrophysics, The Pennsylvania State University, 525 Davey Lab, University Park, PA 16802, USA
- Center for Exoplanets and Habitable Worlds, The Pennsylvania State University, 525 Davey Lab, University Park, PA 16802, USA
| | | | - David J. James
- Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195, USA
| | - Jason D. Eastman
- Harvard-Smithsonian Center for Astrophysics, 60 Garden St, Cambridge, MA 02138, USA
| | - Paul Anthony Wilson
- CNRS, UMR 7095, Institut d’Astrophysique de Paris, 98 Boulevard Arago, F-75014 Paris, France
| | - Daniel Bayliss
- Observatoire Astronomique de l’Université de Geève, Chemin des Maillettes 51, 1290 Sauverny, Switzerland
| | - Daniel J. Stevens
- Department of Physics and Astronomy, Vanderbilt University, 6301 Stevenson Center, Nashville, TN 37235, USA
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Pepper J, Fenton C, Brydon H. Complete heart block as the presenting feature in subarachnoid haemorrhage. BMJ Case Rep 2017; 2017:bcr-2017-222423. [PMID: 29196284 PMCID: PMC5720298 DOI: 10.1136/bcr-2017-222423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/20/2017] [Indexed: 11/04/2022] Open
Abstract
Cardiac manifestations of subarachnoid haemorrhage (SAH) are well-documented phenomena that can complicate the treatment of this devastating condition. Here, we present a case of SAH presenting as complete heart block on initial assessment, an extremely rare event.A 53-year-old woman presented with a witnessed fall, sustaining a mild head injury. She denied any symptoms of SAH. Initial ECG revealed complete heart block, for which the patient was accepted under the cardiology team. For completion, a CT head scan was requested, this demonstrated significant SAH blood load in an aneurysmal rather than traumatic pattern. CT angiogram and subsequent digital subtraction angiography confirmed a posterior communicating artery aneurysm as the cause of the SAH. This case highlights the importance of considering neurological diagnoses in patients with collapse even with concomitant cardiac abnormalities, as the two are often inextricably linked.
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Affiliation(s)
- Joshua Pepper
- Department of Neurosurgery, University Hospital of North Staffordshire NHS Trust, Stoke-on-Trent, UK
| | - Ciara Fenton
- Department of Neurosurgery, University Hospital of North Staffordshire NHS Trust, Stoke-on-Trent, UK
| | - Howard Brydon
- Department of Neurosurgery, University Hospital of North Staffordshire NHS Trust, Stoke-on-Trent, UK
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Abstract
We undertook psychophysical experiments to determine whether the color of the after-image produced by viewing a colored patch which is part of a complex multi-colored scene depends on the wavelength-energy composition of the light reflected from that patch. Our results show that it does not. The after-image, just like the color itself, depends on the ratio of light of different wavebands reflected from it and its surrounds. Hence, traditional accounts of after-images as being the result of retinal adaptation or the perceptual result of physiological opponency, are inadequate. We propose instead that the color of after-images is generated after colors themselves are generated in the visual brain.
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Affiliation(s)
- Semir Zeki
- Laboratory of Neurobiology, University College LondonLondon, UK
| | - Samuel Cheadle
- Laboratory of Neurobiology, University College LondonLondon, UK
| | - Joshua Pepper
- Laboratory of Neurobiology, University College LondonLondon, UK
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Pepper J, Meliak L, Akram H, Hyam J, Milabo C, Candelario J, Foltynie T, Limousin P, Curtis C, Hariz M, Zrinzo L. Changing of the guard: reducing infection when replacing neural pacemakers. J Neurosurg 2017; 126:1165-1172. [DOI: 10.3171/2016.4.jns152934] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
OBJECTIVE
Infection of deep brain stimulation (DBS) hardware has a significant impact on patient morbidity. Previous experience suggests that infection rates appear to be higher after implantable pulse generator (IPG) replacement surgery than after the de novo DBS procedure. In this study the authors examine the effect of a change in practice during DBS IPG replacements at their institution.
METHODS
Starting in January 2012, patient screening for methicillin-resistant Staphylococcus aureus (MRSA) and, and where necessary, eradication was performed prior to elective DBS IPG change. Moreover, topical vancomycin was placed in the IPG pocket during surgery. The authors then prospectively examined the infection rate in patients undergoing DBS IPG replacement at their center over a 3-year period with at least 9 months of follow-up.
RESULTS
The total incidence of infection in this prospective consecutive series of 101 IPG replacement procedures was 0%, with a mean follow-up duration of 24 ± 11 months. This was significantly lower than the authors' previously published historical control group, prior to implementing the change in practice, where the infection rate for IPG replacement was 8.5% (8/94 procedures; p = 0.003).
CONCLUSIONS
This study suggests that a change in clinical practice can significantly lower infection rates in patients undergoing DBS IPG replacement. These simple measures can minimize unnecessary surgery, loss of benefit from chronic stimulation, and costly hardware replacement, further improving the cost efficacy of DBS therapies.
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Affiliation(s)
- Joshua Pepper
- 1Unit of Functional Neurosurgery, University College London Institute of Neurology, Queen Square, London
| | - Lara Meliak
- 1Unit of Functional Neurosurgery, University College London Institute of Neurology, Queen Square, London
| | - Harith Akram
- 1Unit of Functional Neurosurgery, University College London Institute of Neurology, Queen Square, London
| | - Jonathan Hyam
- 1Unit of Functional Neurosurgery, University College London Institute of Neurology, Queen Square, London
- 2Victor Horsley Department of Neurosurgery, National Hospital for Neurology and Neurosurgery, Queen Square, London
| | - Catherine Milabo
- 1Unit of Functional Neurosurgery, University College London Institute of Neurology, Queen Square, London
| | - Joseph Candelario
- 1Unit of Functional Neurosurgery, University College London Institute of Neurology, Queen Square, London
| | - Thomas Foltynie
- 1Unit of Functional Neurosurgery, University College London Institute of Neurology, Queen Square, London
| | - Patricia Limousin
- 1Unit of Functional Neurosurgery, University College London Institute of Neurology, Queen Square, London
| | - Carmel Curtis
- 3Department of Clinical Microbiology, University College London Hospital, London, United Kingdom; and
| | - Marwan Hariz
- 1Unit of Functional Neurosurgery, University College London Institute of Neurology, Queen Square, London
- 4Department of Clinical Neuroscience, Umeå University, Umeå, Sweden
| | - Ludvic Zrinzo
- 1Unit of Functional Neurosurgery, University College London Institute of Neurology, Queen Square, London
- 2Victor Horsley Department of Neurosurgery, National Hospital for Neurology and Neurosurgery, Queen Square, London
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28
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Kennedy GM, Kenworthy MA, Pepper J, Rodriguez JE, Siverd RJ, Stassun KG, Wyatt MC. The transiting dust clumps in the evolved disc of the Sun-like UXor RZ Psc. R Soc Open Sci 2017; 4:160652. [PMID: 28280566 PMCID: PMC5319332 DOI: 10.1098/rsos.160652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/05/2016] [Accepted: 12/21/2016] [Indexed: 06/06/2023]
Abstract
RZ Psc is a young Sun-like star, long associated with the UXor class of variable stars, which is partially or wholly dimmed by dust clumps several times each year. The system has a bright and variable infrared excess, which has been interpreted as evidence that the dimming events are the passage of asteroidal fragments in front of the host star. Here, we present a decade of optical photometry of RZ Psc and take a critical look at the asteroid belt interpretation. We show that the distribution of light curve gradients is non-uniform for deep events, which we interpret as possible evidence for an asteroidal fragment-like clump structure. However, the clumps are very likely seen above a high optical depth midplane, so the disc's bulk clumpiness is not revealed. While circumstantial evidence suggests an asteroid belt is more plausible than a gas-rich transition disc, the evolutionary status remains uncertain. We suggest that the rarity of Sun-like stars showing disc-related variability may arise because (i) any accretion streams are transparent and/or (ii) turbulence above the inner rim is normally shadowed by a flared outer disc.
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Affiliation(s)
- Grant M. Kennedy
- Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
| | - Matthew A. Kenworthy
- Leiden Observatory, Leiden University, PO Box 9513, 2300 RA Leiden, The Netherlands
| | - Joshua Pepper
- Department of Physics, Lehigh University, 16 Memorial Drive East, Bethlehem, PA 18015, USA
| | - Joseph E. Rodriguez
- Harvard-Smithsonian Center for Astrophysics, 60 Garden Street MS-78, Cambridge, MA 02138, USA
- Department of Physics and Astronomy, Vanderbilt University, 6301 Stevenson Center, Nashville, TN 37235, USA
| | - Robert J. Siverd
- Las Cumbres Observatory Global Telescope Network, 6740 Cortona Drive, Suite 102, Santa Barbara, CA 93117, USA
| | - Keivan G. Stassun
- Department of Physics and Astronomy, Vanderbilt University, 6301 Stevenson Center, Nashville, TN 37235, USA
- Department of Physics, Fisk University, 1000 17th Avenue North, Nashville, TN 37208, USA
| | - Mark C. Wyatt
- Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
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30
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Austin C, Mathur SK, Pepper J. Personalised External Aortic Root Support (PEARS): Utilisation in dilatational aortopathies after the arterial switch operation V4. Int J Cardiol 2016; 220:772-4. [PMID: 27393865 DOI: 10.1016/j.ijcard.2016.06.248] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/24/2016] [Accepted: 06/26/2016] [Indexed: 10/21/2022]
Affiliation(s)
- C Austin
- Department of Paediatric Cardiology and Cardiothoracic Surgery, St. Thomas' Hospital, London, United Kingdom.
| | - S K Mathur
- Department of Paediatric Cardiology and Cardiothoracic Surgery, St. Thomas' Hospital, London, United Kingdom.
| | - J Pepper
- Department of Cardiothoracic Surgery, Royal Brompton Hospital, London, United Kingdom.
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Alam S, Albareti FD, Prieto CA, Anders F, Anderson SF, Anderton T, Andrews BH, Armengaud E, Aubourg É, Bailey S, Basu S, Bautista JE, Beaton RL, Beers TC, Bender CF, Berlind AA, Beutler F, Bhardwaj V, Bird JC, Bizyaev D, Blake CH, Blanton MR, Blomqvist M, Bochanski JJ, Bolton AS, Bovy J, Bradley AS, Brandt WN, Brauer DE, Brinkmann J, Brown PJ, Brownstein JR, Burden A, Burtin E, Busca NG, Cai Z, Capozzi D, Rosell AC, Carr MA, Carrera R, Chambers KC, Chaplin WJ, Chen YC, Chiappini C, Chojnowski SD, Chuang CH, Clerc N, Comparat J, Covey K, Croft RAC, Cuesta AJ, Cunha K, Costa LND, Rio ND, Davenport JRA, Dawson KS, Lee ND, Delubac T, Deshpande R, Dhital S, Dutra-Ferreira L, Dwelly T, Ealet A, Ebelke GL, Edmondson EM, Eisenstein DJ, Ellsworth T, Elsworth Y, Epstein CR, Eracleous M, Escoffier S, Esposito M, Evans ML, Fan X, Fernández-Alvar E, Feuillet D, Ak NF, Finley H, Finoguenov A, Flaherty K, Fleming SW, Font-Ribera A, Foster J, Frinchaboy PM, Galbraith-Frew JG, García RA, García-Hernández DA, Pérez AEG, Gaulme P, Ge J, Génova-Santos R, Georgakakis A, Ghezzi L, Gillespie BA, Girardi L, Goddard D, Gontcho SGA, Hernández JIG, Grebel EK, Green PJ, Grieb JN, Grieves N, Gunn JE, Guo H, Harding P, Hasselquist S, Hawley SL, Hayden M, Hearty FR, Hekker S, Ho S, Hogg DW, Holley-Bockelmann K, Holtzman JA, Honscheid K, Huber D, Huehnerhoff J, Ivans II, Jiang L, Johnson JA, Kinemuchi K, Kirkby D, Kitaura F, Klaene MA, Knapp GR, Kneib JP, Koenig XP, Lam CR, Lan TW, Lang D, Laurent P, Goff JML, Leauthaud A, Lee KG, Lee YS, Licquia TC, Liu J, Long DC, López-Corredoira M, Lorenzo-Oliveira D, Lucatello S, Lundgren B, Lupton RH, III CEM, Mahadevan S, Maia MAG, Majewski SR, Malanushenko E, Malanushenko V, Manchado A, Manera M, Mao Q, Maraston C, Marchwinski RC, Margala D, Martell SL, Martig M, Masters KL, Mathur S, McBride CK, McGehee PM, McGreer ID, McMahon RG, Ménard B, Menzel ML, Merloni A, Mészáros S, Miller AA, Miralda-Escudé J, Miyatake H, Montero-Dorta AD, More S, Morganson E, Morice-Atkinson X, Morrison HL, Mosser B, Muna D, Myers AD, Nandra K, Newman JA, Neyrinck M, Nguyen DC, Nichol RC, Nidever DL, Noterdaeme P, Nuza SE, O’Connell JE, O’Connell RW, O’Connell R, Ogando RLC, Olmstead MD, Oravetz AE, Oravetz DJ, Osumi K, Owen R, Padgett DL, Padmanabhan N, Paegert M, Palanque-Delabrouille N, Pan K, Parejko JK, Pâris I, Park C, Pattarakijwanich P, Pellejero-Ibanez M, Pepper J, Percival WJ, Pérez-Fournon I, Pe´rez-Ra`fols I, Petitjean P, Pieri MM, Pinsonneault MH, Mello GFPD, Prada F, Prakash A, Price-Whelan AM, Protopapas P, Raddick MJ, Rahman M, Reid BA, Rich J, Rix HW, Robin AC, Rockosi CM, Rodrigues TS, Rodríguez-Torres S, Roe NA, Ross AJ, Ross NP, Rossi G, Ruan JJ, Rubiño-Martín JA, Rykoff ES, Salazar-Albornoz S, Salvato M, Samushia L, Sánchez AG, Santiago B, Sayres C, Schiavon RP, Schlegel DJ, Schmidt SJ, Schneider DP, Schultheis M, Schwope AD, Scóccola CG, Scott C, Sellgren K, Seo HJ, Serenelli A, Shane N, Shen Y, Shetrone M, Shu Y, Aguirre VS, Sivarani T, Skrutskie MF, Slosar A, Smith VV, Sobreira F, Souto D, Stassun KG, Steinmetz M, Stello D, Strauss MA, Streblyanska A, Suzuki N, Swanson MEC, Tan JC, Tayar J, Terrien RC, Thakar AR, Thomas D, Thomas N, Thompson BA, Tinker JL, Tojeiro R, Troup NW, Vargas-Magaña M, Vazquez JA, Verde L, Viel M, Vogt NP, Wake DA, Wang J, Weaver BA, Weinberg DH, Weiner BJ, White M, Wilson JC, Wisniewski JP, Wood-Vasey WM, Ye`che C, York DG, Zakamska NL, Zamora O, Zasowski G, Zehavi I, Zhao GB, Zheng Z, Zhou (周旭) X, Zhou (周志民) Z, Zou (邹虎) H, Zhu G. THE ELEVENTH AND TWELFTH DATA RELEASES OF THE SLOAN DIGITAL SKY SURVEY: FINAL DATA FROM SDSS-III. ACTA ACUST UNITED AC 2015. [DOI: 10.1088/0067-0049/219/1/12] [Citation(s) in RCA: 1609] [Impact Index Per Article: 178.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Pepper J, Hariz M, Zrinzo L. Deep brain stimulation versus anterior capsulotomy for obsessive-compulsive disorder: a review of the literature. J Neurosurg 2015; 122:1028-37. [DOI: 10.3171/2014.11.jns132618] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Obsessive-compulsive disorder (OCD) is a chronic and debilitating psychiatric condition. Traditionally, anterior capsulotomy (AC) was an established procedure for treatment of patients with refractory OCD. Over recent decades, deep brain stimulation (DBS) has gained popularity. In this paper the authors review the published literature and compare the outcome of AC and DBS targeting of the area of the ventral capsule/ventral striatum (VC/VS) and nucleus accumbens (NAcc).
Patients in published cases were grouped according to whether they received AC or DBS and according to their preoperative scores on the Yale-Brown Obsessive-Compulsive Scale (YBOCS), and then separated according to outcome measures: remission (YBOCS score < 8); response (≥ 35% improvement in YBOCS score); nonresponse (< 35% improvement in YBOCS score); and unfavorable (i.e., worsening of the baseline YBOCS score).
Twenty studies were identified reporting on 170 patients; 62 patients underwent DBS of the VC/VS or the NAcc (mean age 38 years, follow-up 19 months, baseline YBOCS score of 33), and 108 patients underwent AC (mean age 36 years, follow-up 61 months, baseline YBOCS score of 30). In patients treated with DBS there was a 40% decrease in YBOCS score, compared with a 51% decrease for those who underwent AC (p = 0.004). Patients who underwent AC were 9% more likely to go into remission than patients treated with DBS (p = 0.02). No difference in complication rates was noted.
Anterior capsulotomy is an efficient procedure for refractory OCD. Deep brain stimulation in the VC/VS and NAcc area is an emerging and promising therapy. The current popularity of DBS over ablative surgery for OCD is not due to nonefficacy of AC, but possibly because DBS is perceived as more acceptable by clinicians and patients.
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Affiliation(s)
- Joshua Pepper
- 1Unit of Functional Neurosurgery, University College London Institute of Neurology, Queen Square
| | - Marwan Hariz
- 1Unit of Functional Neurosurgery, University College London Institute of Neurology, Queen Square
- 2Department of Clinical Neuroscience, Umeå University, Umeå, Sweden
| | - Ludvic Zrinzo
- 1Unit of Functional Neurosurgery, University College London Institute of Neurology, Queen Square
- 3Victor Horsley Department of Neurosurgery, National Hospital for Neurology and Neurosurgery, Queen Square, London, United Kingdom; and
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Pepper J, Hariz M, Zrinzo L. Response. J Neurosurg 2015; 122:1026-1027. [PMID: 26120618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
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Abstract
BACKGROUND Small, blister-like aneurysms (BLAs), by virtue of their unique morphology, are difficult to treat with conventional modalities. The use of oversized self-expanding stents as monotherapy for BLAs is a relatively new and promising concept that warrants further investigation. OBJECTIVE To clarify the role of oversized self-expanding stents as monotherapy for BLAs. METHODS Five consecutive patients were treated for BLAs with oversized self-expanding stents alone by the senior author (K.R.B.). We report on their clinical and radiographic outcomes. RESULTS All 5 patients in our series were discharged in good clinical condition. Complete aneurysm occlusion was observed in all patients at the time of most recent radiographic follow-up. Mean follow-up time was 13.6 months (range, 1 month to 4.5 years). CONCLUSION The use of oversized self-expanding stents to redirect flow away from aneurysms is an effective option for patients with BLAs. This approach represents an alternative to the use of flow diverters.
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Affiliation(s)
- Ketan R Bulsara
- Department of Neurosurgery, Yale School of Medicine, New Haven, Connecticut, USA.
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Bulsara KR, Ediriwickrema A, Pepper J, Robertson F, Aruny J, Schindler J. Tissue plasminogen activator via cross-collateralization for tandem internal carotid and middle cerebral artery occlusion. World J Clin Cases 2013; 1:290-294. [PMID: 24364024 PMCID: PMC3868713 DOI: 10.12998/wjcc.v1.i9.290] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/19/2013] [Revised: 10/28/2013] [Accepted: 12/11/2013] [Indexed: 02/05/2023] Open
Abstract
Tandem internal carotid and middle cerebral artery occlusion after carotid dissection predicts poor outcome after systemic thrombolysis. Current treatments include the use of endovascular carotid stenting, which carries with it a high risk of propagating further embolic events and worsening the dissection. New strategies for avoiding the aforementioned side-effects include recanalization using cross-collaterals for delivery of intra-lesional tissue plasminogen activator (tPA). We present two cases that provide further support for this novel approach. Both patients presented with a National Institute of Health Stroke Scale of 20, received intra-arterial tPA via cross-collateralization, and made full recoveries without the need for stenting.
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Hartyanszky I, Toth A, Berta B, Polos M, Veres G, Merkely B, Szabolcs Z, Pepper J. 103 * PERSONALIZED SURGICAL REPAIR OF LEFT VENTRICULAR ANEURYSM WITH COMPUTER-ASSISTED VENTRICULAR ENGINEERING. Interact Cardiovasc Thorac Surg 2013. [DOI: 10.1093/icvts/ivt372.103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Bastien FA, Stassun KG, Basri G, Pepper J. An observational correlation between stellar brightness variations and surface gravity. Nature 2013; 500:427-30. [DOI: 10.1038/nature12419] [Citation(s) in RCA: 115] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2013] [Accepted: 06/20/2013] [Indexed: 11/09/2022]
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Treasure T, Pepper J. A call for expressions of interest in a comparative study of the options for pre-emptive aortic root surgery for people with Marfan syndrome. Eur J Cardiothorac Surg 2013. [DOI: 10.1093/ejcts/ezt335] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Stanger O, Schachner T, Gahl B, Thalmann M, Wiedemann D, Suedkamp M, Field M, Englberger L, Carrel T, Pepper J. Type-a aortic dissection after routine, non-aortic cardiac surgery. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht310.p4756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Kotecha D, Lewis A, Leeson P, Krum H, New G, Pepper J, Eccleston D, Flather M, Collins P. Peripheral arterial waveforms for the prediction of death and MI: carotid versus radial pulse wave analysis. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht310.p4996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Kotecha D, Pepper J, Flather MD. 135 CLINICAL APPLICATION AND REPRODUCIBILITY OF CENTRAL PRESSURE AUGMENTATION USING RADIAL ARTERY PULSE WAVE ANALYSIS. Heart 2013. [DOI: 10.1136/heartjnl-2013-304019.135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Pepper J, Zrinzo L, Mirza B, Foltynie T, Limousin P, Hariz M. The Risk of Hardware Infection in Deep Brain Stimulation Surgery Is Greater at Impulse Generator Replacement than at the Primary Procedure. Stereotact Funct Neurosurg 2013. [DOI: 10.1159/000343202] [Citation(s) in RCA: 110] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Kotecha D, New G, Collins P, Krum H, Pepper J, Flather MD. 146 B-type natriuretic peptide and coronary atherosclerosis: an association dependent on central pulse pressure: Abstract 146 Figure 1. Heart 2012. [DOI: 10.1136/heartjnl-2012-301877b.146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Pepper J, Pashankar R, Schindler J, Bulsara K. Abstract 134: Endovascular Revascularization Is Associated With Better Outcomes Than Systemic Throbmolysis Alone For Tandem Internal Carotid And Middle Cerebral Artery Occlusion. Stroke 2012. [DOI: 10.1161/str.43.suppl_1.a134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background and Purpose:
Tandem Internal Carotid Artery and Middle Cerebral Artery or “TIM” occlusions are highly resistant to conventional therapy (systemic thrombolysis) and independently predicts poor patient outcome. Recent evidence suggests that patients treated more aggressively with either endovascular stenting of occluded carotid arteries and/or intra-arterial tissue plasminogen activator (tPA) may have superior outcomes. Here we evaluate all the available data to help assess the best intervention for this patient population that currently has limited treatment options.
Methods:
Data from Medline and the Cochrane database of systemic reviews was searched. The search terms used includes (tandem OR combined) AND (middle cerebral OR internal carotid) AND (OCCLU* or lesion or stenos* or blocka*). All studies had to be in English. All duplicates were identified and removed. To be included the studies needed to report on three key aspects: 1) baseline characteristics (age; NIHSS at presentation); 2) treatment (time to treatment; modality); and 3) outcome (report of patient state at discharge or follow up on the Modified Rankin Scale). Patients were grouped according to whether they received endovascular intervention or stand alone IV tPA. Patients were considered independent if they had a Modified Rankin Scale score of ≤ 2 at follow up or discharge.
Results:
Over 2,500 studies were evaluated. Seventeen studies met the inclusion criteria, with a total of 219 patients. Patients treated with endovascular therapy (n=60) (stenting and/or intra-arterial tPA) were 32% more likely to be independent (p<0.0001) and 28% less likely to have a significant disability (p= 0.0004) compared to patients given systemic thrombolysis (n=139). There was no significant difference in mortality or complication rates between the groups.
Conclusion:
Endovascular therapy appears to be superior compared with systemic thrombolysis in treating patients with TIM occlusions. The risk of iatrogenic complications with more aggressive intervention does not appear to outweigh the outcome benefit. Further and larger studies are needed to assess the benefits and risks of endovascular therapy in patients with TIM lesions.
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Kotecha D, New G, Flather MD, Eccleston D, Pepper J, Krum H. Five-minute heart rate variability can predict obstructive angiographic coronary disease. Heart 2011; 98:395-401. [DOI: 10.1136/heartjnl-2011-300033] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Dweck MR, Joshi S, Murigu T, Gulati A, Alpendurado F, Mohiaddin R, Pepper J, Pennell D, Newby D, Prasad S. 169 Mid-wall fibrosis is an independent predictor of mortality in patients with aortic stenosis. Heart 2011. [DOI: 10.1136/heartjnl-2011-300198.169] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Hlubocký J, Mokráček A, Nováček V, Vojáček J, Burkert J, Kochová P, Klepáček J, Pepper J, Spatenka J. Mechanical properties of mitral allografts are not reasonably influenced by cryopreservation in sheep model. Physiol Res 2011; 60:475-82. [PMID: 21401294 DOI: 10.33549/physiolres.932074] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
A mitral allograft is used exceptionally in the mitral, as well as in the tricuspid position, mostly as an experimental surgical procedure. The authors decided to evaluate the possibility of inserting a cryopreserved mitral allograft into the tricuspid position in a sheep experimental model. Within the framework of this experimental project the mechanical properties of the cryopreserved mitral allograft were tested. A novel methodology studying the functional unit composed of mitral annulus, leaflet, chordae tendinaea, and papillary muscle is presented. A five-parameter Maxwell model was applied to characterize the viscoelastic behavior of sheep mitral valves. A control group of 39 fresh mitral specimens and a test group of 13 cryopreserved mitral allografts from tissue bank were tested. The testing protocol consisted of six loading cycles with 1 mm elongation every 5 min. There was no significant difference in the mean values of the determined parameters (p>0.05) which confirms the main hypothesis that cryopreservation does not influence significantly material parameters characterizing the tissue mechanics. Slight discrepancy is observed in variances of viscous parameters suggesting that the values of the test group may be spread over larger interval due to the treatment.
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Affiliation(s)
- J Hlubocký
- Department of Cardiovascular Surgery, General University Hospital, Prague, Czech Republic
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Vazir A, Hastings P, Morrell M, Pepper J, Henein M, Westaby S, Poole-Wilson P, Cowie M, Simonds A. Resolution of central sleep apnoea following implantation of a left ventricular assist device. Int J Cardiol 2010; 138:317-9. [DOI: 10.1016/j.ijcard.2008.06.072] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/13/2008] [Accepted: 06/28/2008] [Indexed: 11/26/2022]
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Birks E, George R, Noor M, Bahrami T, Amrani M, Pepper J, Dreyfus G, Petrou M, Yacoub M, Khaghani A. 543: Long Term Outcome of Bridge to Recovery Versus Bridge to Transplantation. J Heart Lung Transplant 2010. [DOI: 10.1016/j.healun.2009.11.560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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