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Lamidi S, Coe PO, Bordeianou LG, Hart AL, Hind D, Lindsay JO, Lobo AJ, Myrelid P, Raine T, Sebastian S, Fearnhead NS, Lee MJ, Adams K, Almer S, Ananthakrishnan A, Bethune RM, Block M, Brown SR, Cirocco WC, Cooney R, Davies RJ, Atici SD, Dhar A, Din S, Drobne D, Espin‐Basany E, Evans JP, Fleshner PR, Folkesson J, Fraser A, Graf W, Hahnloser D, Hager J, Hancock L, Hanzel J, Hargest R, Hedin CRH, Hill J, Ihle C, Jongen J, Kader R, Karmiris K, Katsanos KH, Keller DS, Kopylov U, Koutrabakis IE, Lamb CA, Landerholm K, Lee GC, Litta F, Limdi JK, Lopes EW, Madoff RD, Martin ST, Martin‐Perez B, Michalopoulos G, Millan M, Münch A, Nakov R, Noor NM, Oresland T, Paquette IM, Pellino G, Perra T, Porcu A, Roslani AC, Samaan MA, Sebepos‐Rogers GM, Segal JP, de Silva SD, Söderholm AM, Spinelli A, Speight RA, Steinhagen RM, Stenström P, Tsimogiannis KE, Varma MG, Verma AM, Verstockt B, Warden C, Yassin NA, Zawadzki A, Carr P, Devlin B, Avery MSP, Gecse KB, Goren I, Hellström PM, Kotze PG, McWhirter D, Naik AS, Sammour T, Selinger CP, Stein SL, Torres J, Wexner SD, Younge LC. Development of a core descriptor set for Crohn's anal fistula. Colorectal Dis 2022; 25:695-706. [PMID: 36461766 DOI: 10.1111/codi.16440] [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: 07/01/2022] [Revised: 09/21/2022] [Accepted: 11/08/2022] [Indexed: 12/04/2022]
Abstract
AIM Crohn's anal fistula (CAF) is a complex condition, with no agreement on which patient characteristics should be routinely reported in studies. The aim of this study was to develop a core descriptor set of key patient characteristics for reporting in all CAF research. METHOD Candidate descriptors were generated from published literature and stakeholder suggestions. Colorectal surgeons, gastroenterologists and specialist nurses in inflammatory bowel disease took part in three rounds of an international modified Delphi process using nine-point Likert scales to rank the importance of descriptors. Feedback was provided between rounds to allow refinement of the next ratings. Patterns in descriptor voting were assessed using principal component analysis (PCA). Resulting PCA groups were used to organize items in rounds two and three. Consensus descriptors were submitted to a patient panel for feedback. Items meeting predetermined thresholds were included in the final set and ratified at the consensus meeting. RESULTS One hundred and thirty three respondents from 22 countries completed round one, of whom 67.0% completed round three. Ninety seven descriptors were rated across three rounds in 11 PCA-based groups. Forty descriptors were shortlisted. The consensus meeting ratified a core descriptor set of 37 descriptors within six domains: fistula anatomy, current disease activity and phenotype, risk factors, medical interventions for CAF, surgical interventions for CAF, and patient symptoms and impact on quality of life. CONCLUSION The core descriptor set proposed for all future CAF research reflects characteristics important to gastroenterologists and surgeons. This might aid transparent reporting in future studies.
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Affiliation(s)
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- Department of Oncology and Metabolism, The Medical School, University of Sheffield, Sheffield, UK
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Din S. Digit and Sesamoid Bones of Adult Chinkara (Gazella bennettii) (Sykes, 1831) (Mammalia: Bovidae): Morphology and Osteometry. PAK J ZOOL 2022. [DOI: 10.17582/journal.pjz/20210904190928] [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: 11/24/2022]
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Shah M, Zaneb H, Masood S, Khan RU, Mobashar M, Khan I, Din S, Khan MS, Rehman HU, Tinelli A. Single or Combined Applications of Zinc and Multi-strain Probiotic on Intestinal Histomorphology of Broilers Under Cyclic Heat Stress. Probiotics Antimicrob Proteins 2021; 12:473-480. [PMID: 31154611 DOI: 10.1007/s12602-019-09561-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [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: 12/01/2022]
Abstract
Two-hundred-eighty-day-old broiler chicks were divided into seven groups. The groups were designated as T1, thermoneutral zone; T2, heat stressed (HS); T3, HS + zinc (Zn) supplementation (30 mg/kg); T4, HS + Zn (60 mg/kg); T5, HS + probiotic (0.1 g/kg); T6, HS + probiotic (0.1 g/kg) + Zn (30 mg/kg); and T7, HS + Zn (60 mg/kg) + probiotic (0.1 g/kg). Significant decrease (p < 0.05) was observed in villus height (VH), VH to crypt depth ratio, and villus surface area of all intestinal segments in the T2 group when compared with the T1 group. The same parameters had significantly higher (p < 0.05) values in the jejunum and ileum of the Zn- and probiotic-supplemented groups (alone + combination) when compared with the T2 group. The birds exposed to HS showed fewer (p < 0.05) intraepithelial lymphocytes (IELs) in the jejunum and ileum than the T1 group, while their count increased in the jejunum and ileum with dietary treatments. In conclusion, Zn and probiotic positively modulated the intestinal microstructures of broilers kept under high environmental temperature.
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Affiliation(s)
- Muqader Shah
- Department of Animal Health, Faculty of Animal Husbandry and Veterinary Sciences, University of Agriculture, Peshawar, Pakistan.
| | - Hafsa Zaneb
- Department of Anatomy and Histology, Faculty of Biosciences, University of Veterinary and Animal Sciences, Lahore, Pakistan
| | - Saima Masood
- Department of Anatomy and Histology, Faculty of Biosciences, University of Veterinary and Animal Sciences, Lahore, Pakistan
| | - Rifat Ullah Khan
- Department of Animal Health, Faculty of Animal Husbandry and Veterinary Sciences, University of Agriculture, Peshawar, Pakistan
| | - Muhammad Mobashar
- Department of Animal Nutrition, Faculty of Animal Husbandry & Veterinary Science, The University of Agriculture, Peshawar, Pakistan
| | - Imad Khan
- Department of Anatomy and Histology, Faculty of Biosciences, University of Veterinary and Animal Sciences, Lahore, Pakistan
| | - Salahud Din
- Department of Anatomy and Histology, Faculty of Biosciences, University of Veterinary and Animal Sciences, Lahore, Pakistan
| | - Muhammad Shoaib Khan
- Department of Bio-Sciences, Gomal College of Veterinary Sciences, Gomal University, D. I. Khan, Pakistan
| | - Habib Ur Rehman
- Department of Physiology, Faculty of Biosciences, University of Veterinary and Animal Sciences, Lahore, Pakistan
| | - Antonella Tinelli
- Department of Veterinary Medicine, University of Bari "Aldo Moro", Valenzano, BA, Italy
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Hopkins (Maiden Name Kestenbaum) S, Walton H, Shand A, Phillips I, Din S. P78.11 Immunotherapy-Induced Coeliac Disease in the Curative Lung Cancer Patient on Adjuvant Durvalumab. J Thorac Oncol 2021. [DOI: 10.1016/j.jtho.2021.01.1174] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Ibrahim EH, El-kott AF, Alshehri A, Kilany M, Yavari R, Din S, Massoud D. Morphology of Lingual Papillae of Bear: Light Microscopic and SEM Study. PAK J ZOOL 2021. [DOI: 10.17582/journal.pjz/20200813120808] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Hafeez A, Sohail M, Ahmad A, Shah M, Din S, Khan I, Shuiab M, Nasrullah, Shahzada W, Iqbal M, Khan RU. Selected herbal plants showing enhanced growth performance, ileal digestibility, bone strength and blood metabolites in broilers. Journal of Applied Animal Research 2020. [DOI: 10.1080/09712119.2020.1818569] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Abdul Hafeez
- Department of Poultry Science, Faculty of Animal Husbandry & Veterinary Sciences, The University of Agriculture, Peshawar, Pakistan
| | - Muhammad Sohail
- Department of Poultry Science, Faculty of Animal Husbandry & Veterinary Sciences, The University of Agriculture, Peshawar, Pakistan
| | - Altaf Ahmad
- Department of Poultry Science, Faculty of Animal Husbandry & Veterinary Sciences, The University of Agriculture, Peshawar, Pakistan
| | - Muqader Shah
- College of Veterinary Sciences, Faculty of Animal Husbandry & Veterinary Sciences, The University of Agriculture, Peshawar, Pakistan
| | - Salahud Din
- Livestock and Dairy Development, Peshawar, Pakistan
| | - Imad Khan
- College of Veterinary Sciences and Animal Husbandry, Abdul Wali Khan University, Mardan, Pakistan
| | - Muhammad Shuiab
- Department of Poultry Science, Faculty of Animal Husbandry & Veterinary Sciences, The University of Agriculture, Peshawar, Pakistan
| | - Nasrullah
- Department of Poultry Science, Faculty of Animal Husbandry & Veterinary Sciences, The University of Agriculture, Peshawar, Pakistan
| | - Walikhan Shahzada
- Ministry of Agriculture, Irrigation and Livestock (MAIL) Kabul-Afghanistan, Veterinary Research Institute, Peshawar, Pakistan
| | | | - Rifat Ullah Khan
- College of Veterinary Sciences, Faculty of Animal Husbandry & Veterinary Sciences, The University of Agriculture, Peshawar, Pakistan
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Bogert NV, Furkel J, Din S, Braren I, Eckstein V, Müller JA, Uhlmann L, Katus HA, Konstandin MH. A novel approach to genetic engineering of T-cell subsets by hematopoietic stem cell infection with a bicistronic lentivirus. Sci Rep 2020; 10:13740. [PMID: 32792615 PMCID: PMC7426960 DOI: 10.1038/s41598-020-70793-6] [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] [Received: 04/20/2020] [Accepted: 08/04/2020] [Indexed: 11/23/2022] Open
Abstract
Lentiviral modification of hematopoietic stem cells (HSCs) paved the way for in vivo experimentation and therapeutic approaches in patients with genetic disease. A disadvantage of this method is the use of a ubiquitous promoter leads not only to genetic modification of the leukocyte subset of interest e.g. T-cells, but also all other subsequent leukocyte progeny of the parent HSCs. To overcome this limitation we tested a bicistronic lentivirus, enabling subset specific modifications. Designed novel lentiviral constructs harbor a global promoter (mPGK) regulating mCherry for HSCs selection and a T-cell specific promoter upstream of eGFP. Two T-cell specific promoters were assessed: the distal Lck—(dLck) and the CD3δ-promoter. Transduced HSCs were FACS sorted by mCherry expression and transferred into sublethally irradiated C57/BL6 mice. Successful transplantation and T-cell specific expression of eGFP was monitored by peripheral blood assessment. Furthermore, recruitment response of lentiviral engineered leukocytes to the site of inflammation was tested in a peritonitis model without functional impairment. Our constructed lentivirus enables fast generation of subset specific leukocyte transgenesis as shown in T-cells in vivo and opens new opportunities to modify other HSCs derived subsets in the future.
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Affiliation(s)
- N V Bogert
- Department of Cardiology, University Hospital Heidelberg, Ruprecht-Karls-University, Heidelberg, Germany. .,DZHK (German Centre for Cardiovascular Research) Partner Site, Heidelberg/Mannheim, Germany.
| | - J Furkel
- Department of Cardiology, University Hospital Heidelberg, Ruprecht-Karls-University, Heidelberg, Germany.,DZHK (German Centre for Cardiovascular Research) Partner Site, Heidelberg/Mannheim, Germany
| | - S Din
- Department of Cardiology, University Hospital Heidelberg, Ruprecht-Karls-University, Heidelberg, Germany.,DZHK (German Centre for Cardiovascular Research) Partner Site, Heidelberg/Mannheim, Germany
| | - I Braren
- Vector Core Facility, University Hospital Hamburg-Eppendorf, University Hamburg, Hamburg, Germany.,DZHK (German Centre for Cardiovascular Research) Partner Site, Hamburg, Germany
| | - V Eckstein
- Department of Hematology, University Hospital Heidelberg, Ruprecht-Karls-University, Heidelberg, Germany
| | - J A Müller
- Department of Hematology, University Hospital Heidelberg, Ruprecht-Karls-University, Heidelberg, Germany
| | - L Uhlmann
- Institute of Medical Biometry and Informatics, University Hospital Heidelberg, Ruprecht-Karls-University, Heidelberg, Germany
| | - H A Katus
- Department of Cardiology, University Hospital Heidelberg, Ruprecht-Karls-University, Heidelberg, Germany.,DZHK (German Centre for Cardiovascular Research) Partner Site, Heidelberg/Mannheim, Germany
| | - M H Konstandin
- Department of Cardiology, University Hospital Heidelberg, Ruprecht-Karls-University, Heidelberg, Germany.,DZHK (German Centre for Cardiovascular Research) Partner Site, Heidelberg/Mannheim, Germany
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Din S, Masood S, Zaneb H, Rehman HU, Ashraf S, Khan I, Shah M, Hadi SA. Gross and Clinical Anatomy of the Skull of Adult Chinkara (Gazella bennettii). PAK J ZOOL 2020. [DOI: 10.17582/journal.pjz/20190207070209] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Plevris N, Chuah CS, Allen RM, Arnott ID, Brennan PN, Chaudhary S, Churchhouse AMD, Din S, Donoghue E, Gaya DR, Groome M, Jafferbhoy HM, Jenkinson PW, Lam WL, Lyons M, Macdonald JC, MacMaster M, Mowat C, Naismith GD, Potts LF, Saffouri E, Seenan JP, Sengupta A, Shasi P, Sutherland DI, Todd JA, Veryan J, Watson AJM, Watts DA, Jones GR, Lees CW. Real-world Effectiveness and Safety of Vedolizumab for the Treatment of Inflammatory Bowel Disease: The Scottish Vedolizumab Cohort. J Crohns Colitis 2019; 13:1111-1120. [PMID: 30768123 DOI: 10.1093/ecco-jcc/jjz042] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [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] [Indexed: 02/08/2023]
Abstract
BACKGROUND & AIMS Vedolizumab is an anti-a4b7 monoclonal antibody that is licensed for the treatment of moderate to severe Crohn's disease and ulcerative colitis. The aims of this study were to establish the real-world effectiveness and safety of vedolizumab for the treatment of inflammatory bowel disease. METHODS This was a retrospective study involving seven NHS health boards in Scotland between June 2015 and November 2017. Inclusion criteria included: a diagnosis of ulcerative colitis or Crohn's disease with objective evidence of active inflammation at baseline (Harvey-Bradshaw Index[HBI] ≥5/Partial Mayo ≥2 plus C-reactive protein [CRP] >5 mg/L or faecal calprotectin ≥250 µg/g or inflammation on endoscopy/magnetic resonance imaging [MRI]); completion of induction; and at least one clinical follow-up by 12 months. Kaplan-Meier survival analysis was used to establish 12-month cumulative rates of clinical remission, mucosal healing, and deep remission [clinical remission plus mucosal healing]. Rates of serious adverse events were described quantitatively. RESULTS Our cohort consisted of 180 patients with ulcerative colitis and 260 with Crohn's disease. Combined median follow-up was 52 weeks (interquartile range [IQR] 26-52 weeks). In ulcerative colitis, 12-month cumulative rates of clinical remission, mucosal healing, and deep remission were 57.4%, 47.3%, and 38.5%, respectively. In Crohn's disease, 12-month cumulative rates of clinical remission, mucosal healing, and deep remission were 58.4%, 38.9%, and 28.3% respectively. The serious adverse event rate was 15.6 per 100 patient-years of follow-up. CONCLUSIONS Vedolizumab is a safe and effective treatment for achieving both clinical remission and mucosal healing in ulcerative colitis and Crohn's disease.
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Affiliation(s)
- N Plevris
- The Edinburgh IBD Unit, Western General Hospital, Edinburgh, UK
| | - C S Chuah
- The Edinburgh IBD Unit, Western General Hospital, Edinburgh, UK
| | - R M Allen
- Department of Gastroenterology, Glasgow Royal Infirmary, Glasgow, UK
| | - I D Arnott
- The Edinburgh IBD Unit, Western General Hospital, Edinburgh, UK
| | - P N Brennan
- Department of Gastroenterology, Ninewells Hospital, Dundee, UK
| | - S Chaudhary
- Department of Gastroenterology, University Hospital Hairmyres, East Kilbride, UK
| | | | - S Din
- The Edinburgh IBD Unit, Western General Hospital, Edinburgh, UK
| | - E Donoghue
- Department of Gastroenterology, Forth Valley Royal Hospital, Larbert, UK
| | - D R Gaya
- Department of Gastroenterology, Glasgow Royal Infirmary, Glasgow, UK
| | - M Groome
- Department of Gastroenterology, Ninewells Hospital, Dundee, UK
| | - H M Jafferbhoy
- Department of Gastroenterology, Victoria Hospital, Kirkcaldy, UK
| | - P W Jenkinson
- The Edinburgh IBD Unit, Western General Hospital, Edinburgh, UK.,Department of Colorectal Surgery, Raigmore Hospital, Inverness, UK
| | - W L Lam
- Department of Gastroenterology, Glasgow Royal Infirmary, Glasgow, UK
| | - M Lyons
- The Edinburgh IBD Unit, Western General Hospital, Edinburgh, UK
| | - J C Macdonald
- Department of Gastroenterology, Queen Elizabeth University Hospital, Glasgow, UK
| | - M MacMaster
- Department of Gastroenterology, Glasgow Royal Infirmary, Glasgow, UK
| | - C Mowat
- Department of Gastroenterology, Ninewells Hospital, Dundee, UK
| | - G D Naismith
- Department of Gastroenterology, Royal Alexandra Hospital, Paisley, UK
| | - L F Potts
- Department of Gastroenterology, Raigmore Hospital, Inverness, UK
| | - E Saffouri
- Department of Gastroenterology, Glasgow Royal Infirmary, Glasgow, UK
| | - J P Seenan
- Department of Gastroenterology, Queen Elizabeth University Hospital, Glasgow, UK
| | - A Sengupta
- Department of Gastroenterology, Victoria Hospital, Kirkcaldy, UK
| | - P Shasi
- Department of Gastroenterology, Ninewells Hospital, Dundee, UK
| | - D I Sutherland
- Department of Gastroenterology, University Hospital Hairmyres, East Kilbride, UK
| | - J A Todd
- Department of Gastroenterology, Ninewells Hospital, Dundee, UK
| | - J Veryan
- Department of Gastroenterology, Glasgow Royal Infirmary, Glasgow, UK
| | - A J M Watson
- Department of Colorectal Surgery, Raigmore Hospital, Inverness, UK
| | - D A Watts
- Department of Gastroenterology, Forth Valley Royal Hospital, Larbert, UK
| | - G R Jones
- The Edinburgh IBD Unit, Western General Hospital, Edinburgh, UK
| | - C W Lees
- The Edinburgh IBD Unit, Western General Hospital, Edinburgh, UK
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Shah M, Zaneb H, Masood S, Khan RU, Din S, Shakirullah S, Khan I, Tariq A, Rehman HU. Ameliorative Effect of Zinc and Multistrain Probiotic on Muscle and Bone Characteristics in Broiler Reared under Cyclic Heat Stress. PAK J ZOOL 2019. [DOI: 10.17582/journal.pjz/2019.51.3.1041.1046] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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11
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Din S, Masood S, Zaneb H, Rehman HU, Ashraf S, Khan I, Shah M, Hadi SA. Osteometric and Radiographic Studies of Tarsal Bones in Adult Chinkara (Gazella bennettii). PAK J ZOOL 2019. [DOI: 10.17582/journal.pjz/2019.51.6.2033.2040] [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: 11/24/2022]
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12
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Mummadi SM, Darr A, Hakim N, Din S, Bhimrao SK. A rare case of Schneiderian papilloma of the middle ear presenting with pulsatile tinnitus. Ann R Coll Surg Engl 2018; 100:e109-e111. [PMID: 29607726 DOI: 10.1308/rcsann.2018.0035] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [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: 11/22/2022] Open
Abstract
Schneiderian papillomas (ISP) of the middle ear are uncommon conditions, with only 45 cases published within literature. They are locally aggressive tumours, with a high rate of recurrence and associated malignancy. We present a rare case of a 53-year-old man presenting with unilateral pulsatile tinnitus, otorrhoea, aural fullness, pruritis and hearing loss. Angiography was employed to exclude a glomus tumour and the patient underwent a modified radical mastoidectomy. Tissue samples confirmed a histological diagnosis of ISP of the middle ear. Follow-up magnetic resonanc imaging one year postoperatively showed no evidence of disease recurrence.
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Affiliation(s)
- S M Mummadi
- University Hospitals of North Midlands NHS Trust , Stoke on Trent , UK
| | - A Darr
- University Hospitals of North Midlands NHS Trust , Stoke on Trent , UK
| | - N Hakim
- Princess Royal University Hospital , Orpington, Kent , UK
| | - S Din
- University Hospitals of North Midlands NHS Trust , Stoke on Trent , UK
| | - S K Bhimrao
- University Hospitals of North Midlands NHS Trust , Stoke on Trent , UK
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Nicklin C, Martinez-Hardigree J, Warne A, Green S, Burt M, Naylor J, Dorman A, Wicks D, Din S, Riede M. MINERVA: A facility to study Microstructure and INterface Evolution in Realtime under VAcuum. Rev Sci Instrum 2017; 88:103901. [PMID: 29092474 DOI: 10.1063/1.4989761] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A sample environment to enable real-time X-ray scattering measurements to be recorded during the growth of materials by thermal evaporation in vacuum is presented. The in situ capabilities include studying microstructure development with time or during exposure to different environmental conditions, such as temperature and gas pressure. The chamber provides internal slits and a beam stop, to reduce the background scattering from the X-rays passing through the entrance and exit windows, together with highly controllable flux rates of the evaporants. Initial experiments demonstrate some of the possibilities by monitoring the growth of bathophenanthroline (BPhen), a common molecule used in organic solar cells and organic light emitting diodes, including the development of the microstructure with time and depth within the film. The results show how BPhen nanocrystal structures coarsen at room temperature under vacuum, highlighting the importance of using real time measurements to understand the as-deposited pristine film structure and its development with time. More generally, this sample environment is versatile and can be used for investigation of structure-property relationships in a wide range of vacuum deposited materials and their applications in, for example, optoelectronic devices and energy storage.
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Affiliation(s)
- Chris Nicklin
- Diamond Light Source, Ltd., Harwell Science and Innovation Campus, Chilton OX11 0DE, United Kingdom
| | | | - Adam Warne
- Diamond Light Source, Ltd., Harwell Science and Innovation Campus, Chilton OX11 0DE, United Kingdom
| | - Stephen Green
- Diamond Light Source, Ltd., Harwell Science and Innovation Campus, Chilton OX11 0DE, United Kingdom
| | - Martin Burt
- Diamond Light Source, Ltd., Harwell Science and Innovation Campus, Chilton OX11 0DE, United Kingdom
| | - John Naylor
- Kurt J. Lesker Company, Hastings TN35 4NR, United Kingdom
| | - Adam Dorman
- Kurt J. Lesker Company, Hastings TN35 4NR, United Kingdom
| | - Dean Wicks
- Kurt J. Lesker Company, Hastings TN35 4NR, United Kingdom
| | - Salahud Din
- Kurt J. Lesker Company, Hastings TN35 4NR, United Kingdom
| | - Moritz Riede
- Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, United Kingdom
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Robaschik P, Ma Y, Din S, Heutz S. Formation of ferromagnetic molecular thin films from blends by annealing. Beilstein J Nanotechnol 2017; 8:1469-1475. [PMID: 28900600 PMCID: PMC5530637 DOI: 10.3762/bjnano.8.146] [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] [Figures] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Accepted: 06/20/2017] [Indexed: 06/07/2023]
Abstract
We report on a new approach for the fabrication of ferromagnetic molecular thin films. Co-evaporated films of manganese phthalocyanine (MnPc) and tetracyanoquinodimethane (TCNQ) have been produced by organic molecular beam deposition (OMBD) on rigid (glass, silicon) and flexible (Kapton) substrates kept at room temperature. The MnPc:TCNQ films are found to be entirely amorphous due to the size mismatch of the molecules. However, by annealing while covering the samples highly crystalline MnPc films in the β-polymorph can be obtained at 60 °C lower than when starting with pure MnPc films. The resulting films exhibit substantial coercivity (13 mT) at 2 K and a Curie temperature of 11.5 K.
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Affiliation(s)
- Peter Robaschik
- Department of Materials and London Centre for Nanotechnology, Imperial College London, Exhibition Rd, London SW7 2AZ, United Kingdom
| | - Ye Ma
- Department of Materials and London Centre for Nanotechnology, Imperial College London, Exhibition Rd, London SW7 2AZ, United Kingdom
| | - Salahud Din
- Department of Materials and London Centre for Nanotechnology, Imperial College London, Exhibition Rd, London SW7 2AZ, United Kingdom
- Kurt J. Lesker Company, Sidney Little Rd, St Leonard’s on Sea TN38 9PU, United Kingdom
| | - Sandrine Heutz
- Department of Materials and London Centre for Nanotechnology, Imperial College London, Exhibition Rd, London SW7 2AZ, United Kingdom
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Fleet LR, Stott J, Villis B, Din S, Serri M, Aeppli G, Heutz S, Nathan A. Self-Assembled Molecular Nanowires for High-Performance Organic Transistors. ACS Appl Mater Interfaces 2017; 9:20686-20695. [PMID: 28547994 DOI: 10.1021/acsami.7b01449] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
While organic semiconductors provide tantalizing possibilities for low-cost, light-weight, flexible electronic devices, their current use in transistors-the fundamental building block-is rather limited as their speed and reliability are not competitive with those of their inorganic counterparts and are simply too poor for many practical applications. Through self-assembly, highly ordered nanostructures can be prepared that have more competitive transport characteristics; however, no simple, scalable method has been discovered that can produce devices on the basis of such nanostructures. Here, we show how transistors of self-assembled molecular nanowires can be fabricated using a scalable, gradient sublimation technique, which have dramatically improved characteristics compared to those of their thin-film counterparts, both in terms of performance and stability. Nanowire devices based on copper phthalocyanine have been fabricated with threshold voltages as low as -2.1 V, high on/off ratios of 105, small subthreshold swings of 0.9 V/decade, and mobilities of 0.6 cm2/V s, and lower trap energies as deduced from temperature-dependent properties, in line with leading organic semiconductors involving more complex fabrication. High-performance transistors manufactured using our scalable deposition technique, compatible with flexible substrates, could enable integrated all-organic chips implementing conventional as well as neuromorphic computation and combining sensors, logic, data storage, drivers, and displays.
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Affiliation(s)
| | - James Stott
- London Centre for Nanotechnology, University College London , London WC1H 0AH, U.K
| | - Byron Villis
- London Centre for Nanotechnology, University College London , London WC1H 0AH, U.K
| | | | | | - Gabriel Aeppli
- Department of Physics, ETH Zürich , Zürich CH-8093, Switzerland
- Department of Physics, École Polytechnique Fédérale de Lausanne (EPFL) , Lausanne CH-1015, Switzerland
- Photon Science Division, Paul Scherrer Institute , Villigen CH-5232, Switzerland
| | | | - Arokia Nathan
- London Centre for Nanotechnology, University College London , London WC1H 0AH, U.K
- Electrical Engineering Division, Department of Engineering, Cambridge University , Cambridge, U.K
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Little K, Goodridge S, Lewis H, Lingard S, Din S, Tidley M, Roberts R, Williams N, Hayes S. Occupational vaccination of health care workers: uptake, attitudes and potential solutions. Public Health 2015; 129:755-62. [DOI: 10.1016/j.puhe.2015.02.031] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2014] [Revised: 12/31/2014] [Accepted: 02/22/2015] [Indexed: 01/05/2023]
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Ferreira R, Gonzaga A, Cardoso P, Santos J, Stanislao M, Facciorusso A, Di Stolfo G, Criconia G, Parisi A, Michelini S, Fanelli M, Valle G, Gokhan O, Hasan A, Mehmet D, Mehmet M, Selvi C, Mustafa K, Ismet Z, Din S, Snowdon R, Williams K, Michail M, Koh T. Clinical Case Session I: Sunday 3 May 2015, 10:00-11:00 * Room: Venecia. Eur Heart J Cardiovasc Imaging 2015. [DOI: 10.1093/ehjci/jev044] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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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Rimner A, Din S, Shaikh F, Foster A, Tyagi N, Abi Aad S, Paik P, Yorke E, Chaft J, Gelblum D, Rosenzweig K, Wu A. Stage III Non-Small Cell Lung Cancer Treated Without Concurrent Chemotherapy: What Is the Optimal Radiation Dose? Int J Radiat Oncol Biol Phys 2014. [DOI: 10.1016/j.ijrobp.2014.08.181] [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: 11/30/2022]
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Rimner A, Din S, Shaikh F, Foster A, Tyagi N, Abi Aad S, Paik P, Yorke E, Chaft J, Gelblum D, Rosenzweig K, Wu A. Stage III Non-Small Cell Lung Cancer Treated Without Concurrent Chemotherapy: What Is the Optimal Radiation Dose? Int J Radiat Oncol Biol Phys 2014. [DOI: 10.1016/j.ijrobp.2014.05.1932] [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: 10/24/2022]
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Rimner A, Adeseye V, Foster A, Woo K, Shaikh F, Din S, Zhang Z, Yorke E, Gewanter R, Rosenzweig K, Huang J, Wu A. Recurrence Patterns and Second Primary Lung Cancers After Stereotactic Body Radiation Therapy for Early-Stage Non-Small Cell Lung Cancer: Implications for Surveillance. Int J Radiat Oncol Biol Phys 2014. [DOI: 10.1016/j.ijrobp.2014.05.788] [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: 11/28/2022]
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Warner M, Mauthoor S, Felton S, Wu W, Gardener JA, Din S, Klose D, Morley GW, Stoneham AM, Fisher AJ, Aeppli G, Kay CWM, Heutz S. Spin-based diagnostic of nanostructure in copper phthalocyanine-C60 solar cell blends. ACS Nano 2012; 6:10808-10815. [PMID: 23186550 DOI: 10.1021/nn304156e] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Nanostructure and molecular orientation play a crucial role in determining the functionality of organic thin films. In practical devices, such as organic solar cells consisting of donor-acceptor mixtures, crystallinity is poor and these qualities cannot be readily determined by conventional diffraction techniques, while common microscopy only reveals surface morphology. Using a simple nondestructive technique, namely, continuous-wave electron paramagnetic resonance spectroscopy, which exploits the well-understood angular dependence of the g-factor and hyperfine tensors, we show that in the solar cell blend of C(60) and copper phthalocyanine (CuPc)-for which X-ray diffraction gives no information-the CuPc, and by implication the C(60), molecules form nanoclusters, with the planes of the CuPc molecules oriented perpendicular to the film surface. This information demonstrates that the current nanostructure in CuPc:C(60) solar cells is far from optimal and suggests that their efficiency could be considerably increased by alternative film growth algorithms.
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Affiliation(s)
- Marc Warner
- London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, London WC1H 0AH, UK.
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Cruickshank AC, Dotzler CJ, Din S, Heutz S, Toney MF, Ryan MP. The Crystalline Structure of Copper Phthalocyanine Films on ZnO(11̅00). J Am Chem Soc 2012; 134:14302-5. [DOI: 10.1021/ja305760b] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Amy C. Cruickshank
- Department of Materials and
London Centre for Nanotechnology, Imperial College London, Exhibition Road, London SW7 2AZ, United Kingdom
| | - Christian J. Dotzler
- Industrial Research Ltd., P.O. Box 31-310, Lower Hutt 5040, New Zealand
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory,
Menlo Park, California 94025, United States
| | - Salahud Din
- Department of Materials and
London Centre for Nanotechnology, Imperial College London, Exhibition Road, London SW7 2AZ, United Kingdom
| | - Sandrine Heutz
- Department of Materials and
London Centre for Nanotechnology, Imperial College London, Exhibition Road, London SW7 2AZ, United Kingdom
| | - Michael F. Toney
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory,
Menlo Park, California 94025, United States
| | - Mary P. Ryan
- Department of Materials and
London Centre for Nanotechnology, Imperial College London, Exhibition Road, London SW7 2AZ, United Kingdom
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Wang H, Mauthoor S, Din S, Gardener JA, Chang R, Warner M, Aeppli G, McComb DW, Ryan MP, Wu W, Fisher AJ, Stoneham M, Heutz S. Ultralong copper phthalocyanine nanowires with new crystal structure and broad optical absorption. ACS Nano 2010; 4:3921-3926. [PMID: 20527798 DOI: 10.1021/nn100782w] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The development of molecular nanostructures plays a major role in emerging organic electronic applications, as it leads to improved performance and is compatible with our increasing need for miniaturization. In particular, nanowires have been obtained from solution or vapor phase and have displayed high conductivity or large interfacial areas in solar cells. In all cases however, the crystal structure remains as in films or bulk, and the exploitation of wires requires extensive postgrowth manipulation as their orientations are random. Here we report copper phthalocyanine (CuPc) nanowires with diameters of 10-100 nm, high directionality, and unprecedented aspect ratios. We demonstrate that they adopt a new crystal phase, designated eta-CuPc, where the molecules stack along the long axis. The resulting high electronic overlap along the centimeter length stacks achieved in our wires mediates antiferromagnetic couplings and broadens the optical absorption spectrum. The ability to fabricate ultralong, flexible metal phthalocyanine nanowires opens new possibilities for applications of these simple molecules.
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Affiliation(s)
- Hai Wang
- Department of Physics and Astronomy and London Centre for Nanotechnology, University College London, London WC1E 6BT, UK
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Din S, Cochrane CJ, Noble CL, Satsangi J, Arnott IDR. Combination therapy of infliximab and azathioprine reduces disease progression in Crohn's disease. Inflamm Bowel Dis 2008; 14:143-5. [PMID: 17932978 DOI: 10.1002/ibd.20260] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/09/2022]
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Khairi MDM, Din S, Shahid H, Normastura AR. Hearing screening of infants in Neonatal Unit, Hospital Universiti Sains Malaysia using transient evoked otoacoustic emissions. J Laryngol Otol 2006; 119:678-83. [PMID: 16156907 DOI: 10.1258/0022215054798014] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The objective of this prospective study was to report on the prevalence of hearing impairment in the neonatal unit population. From 15 February 2000 to 15 March 2000 and from 15 February 2001 to 15 May 2001, 401 neonates were screened using transient evoked otoacoustic emissions (TEOAE) followed by second-stage screening of those infants who failed the initial test. Eight (2 per cent) infants failed one ear and 23 (5.74 per cent) infants failed both ears, adding up to 7.74 per cent planned for second-stage screening. Five out of 22 infants who came for the follow up failed the screening, resulting in a prevalence of hearing impairment of 1 per cent (95 per cent confidence interval [95% CI]: 0.0–2.0). Craniofacial malformations, very low birth weight, ototoxic medication, stigmata/syndromes associated with hearing loss and hyperbilirubinaemia at the level of exchange tranfusion were identified to be independent significant risk factors for hearing impairment, while poor Apgar scores and mechanical ventilation of more than five days were not. In conclusion, hearing screening in high-risk neonates revealed a total of 1 per cent with hearing loss. The changes in the risk profile indicate improved perinatal handling in a neonatal population at risk for hearing disorders.
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Affiliation(s)
- M D Mohd Khairi
- Department of Otorhinolaryngology-Head & Neck Surgery, Universiti Sains Malaysia, Health Campus, Kelantan, Malaysia.
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Tzamaloukas AH, Oreopoulos DG, Murata GH, Servilla K, Rao P, Din S, Malhotra D. The relation between nutrition indices and age in patients on continuous ambulatory peritoneal dialysis receiving similar small solute clearances. Int Urol Nephrol 2002; 32:449-58. [PMID: 11583370 DOI: 10.1023/a:1017579105158] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
OBJECTIVE To analyze the effect of age on nutrition indices in subjects on the same continuous ambulatory peritoneal dialysis (CAPD) schedule. METHODS We analyzed 613 sets of clearance values and nutrition indices in 302 CAPD patients. Small solute clearances included urea clearance (Kt/Vurea) and creatinine clearance (Ccr). Nutrition indices included body mass index (BMI), serum albumin, urea and creatinine, 24-h urea nitrogen and creatinine excretion in urine plus dialysate, protein nitrogen appearance (PNA), PNA normalized by standard weight (nPNA), lean body mass (LBM) computed by creatinine kinetics, and LBM/Weight. CAPD subjects were classified in 4 age quartiles (Q): Group Q1, age 33.7 +/- 7.6 years, N = 149; group Q2, age 49.5 +/- 3.8 years, N = 158; group Q3, age 61.5 +/- 2.6 years, N = 154; and group Q4, age 72.1 +/- 5.4 years, N = 152. Group comparison was done by one-way ANOVA or chi-square. Predictors of low nutritional parameters were identified by logistic regression. Selected variables were compared by linear regression. RESULTS Mean Kt/Vurea and Ccr were above the current adequacy standards and did not differ between the age quartiles. In contrast, older quartiles had, in general, lower nutrition indices than younger quartiles. However, the youngest quartile had the lowest BMI. By logistic regression, young age was a predictor of low BMI, while advanced age was a predictor of low creatinine and urea nitrogen excretion, low nPNA, and low LBM/Weight. The regressions of nPNA on Kt/Vurea differed between the age quartiles. By these regressions, the youngest quartile had higher nPNA values for the same Kt/Vurea than the oldest quartile in the clinically relevant range of Kt/Vurea and nPNA values. CONCLUSIONS Nutrition indices are worse in older than in younger CAPD patients with the same small solute clearances. Nutrition of CAPD patients is adversely affected by age and requires special attention in the older age group.
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Affiliation(s)
- A H Tzamaloukas
- Medicine Service, New Mexico VA Health Care System and University of New Mexico School of Medicine, Albuquerque, USA
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Fram DB, Giri S, Jamil G, Mitchel JF, Boden WE, Din S, Kiernan FJ. Suture closure of the femoral arteriotomy following invasive cardiac procedures: a detailed analysis of efficacy, complications, and the impact of early ambulation in 1,200 consecutive, unselected cases. Catheter Cardiovasc Interv 2001; 53:163-73. [PMID: 11387599 DOI: 10.1002/ccd.1143] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The purpose of this study was to assess the efficacy and safety of using a percutaneous suture device to close femoral arteriotomies following invasive cardiac procedures. All patients presenting for invasive cardiac procedures performed from the femoral artery were considered for suture closure. Patients were carefully assessed for access site complications, oozing, and the impact of suture closure on the safety of early ambulation. Clinical follow-up at 3-6 months was performed to assess for late complications. Femoral artery suture closures were performed in 1,200 consecutive cases in 1,097 patients. In 12.8% of cases, the patients ambulated within 1 hr. The success rate was 91.2% and the complication rate was 3.4%. Complications included the development of a hematoma (2.1%), the need for vascular surgery (0.6%), retroperitoneal hemorrhage (0.3%), blood transfusion (0.7%), local infection (0.5%), and pseudoaneurysm formation (0.1%). Factors found to be independently predictive of procedural failure were an age > 70 years, an ACT > 300 sec, left femoral artery access, and the performance of primary angioplasty. Follow-up at 3-6 months revealed no major hemorrhagic complications. We conclude that percutaneous suture closure effectively achieves femoral artery hemostasis in patients undergoing invasive cardiac procedures. The technique permits early ambulation and is associated with a relatively low incidence of complication.
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Affiliation(s)
- D B Fram
- Division of Cardiology, Hartford Hospital, University of Connecticut, Hartford, Connecticut, USA.
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Manka DR, Wiegman P, Din S, Sanders JM, Green SA, Gimple LW, Ragosta M, Powers ER, Ley K, Sarembock IJ. Arterial injury increases expression of inflammatory adhesion molecules in the carotid arteries of apolipoprotein-E-deficient mice. J Vasc Res 1999; 36:372-8. [PMID: 10559677 DOI: 10.1159/000025676] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Recent studies demonstrate increased cellular adhesion molecule expression by neointimal endothelium overlying primary and restenotic atherosclerotic plaque. In this study, we developed an atherosclerotic mouse model of arterial injury and characterized adhesion molecule expression after injury. Sixteen apolipoprotein-E-(ApoE)-deficient mice fed a Western-type diet for 4 weeks underwent carotid artery wire denudation at week 2. For each segment, the extent of neointima formation and medial thickening, or adhesion molecule expression, were scored separately on a scale from 0 (no plaque/thickening or expression) to 3 (extensive plaque/thickening or expression) using Movat staining (n = 3) or immunohistochemical analysis (n = 13). Histology revealed significant medial thickening (1.8 +/- 0.9 vs. 0.3 +/- 0.5, p < 0. 001) versus controls and pronounced staining for monocytes/macrophages in the wall of injured vessels. Immunohistochemical analysis showed more robust expression of intercellular adhesion molecule-1 (ICAM-1) and vascular cell adhesion molecule-1 (VCAM-1) on the luminal surface of injured arteries versus controls (2.2 +/- 0.6 vs. 1.4 +/- 0.7, p < 0.01, and 2.5 +/- 0.5 vs. 1.2 +/- 0.6, p < 0.001, respectively). Injury increased adventitial ICAM-1 expression (2.6 +/- 0.5 vs. 1.6 +/- 0.5, p < 0.002) and medial VCAM-1 expression (2.2 +/- 0.6 vs. 1.2 +/- 0. 7, p < 0.004). Thus, carotid injury results in significant medial thickening and increases adhesion molecule expression beyond that induced in ApoE-deficient mice fed a Western diet alone. The observation of macrophage infiltration into the media at sites of increased ICAM-1 and VCAM-1 expression suggests that these molecules may mediate monocyte/macrophage trafficking into the wall of injured arteries.
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Affiliation(s)
- D R Manka
- Department of Biomedical Engineering, University of Virginia, Health Sciences Centers, Charlottesville, VA 22908, USA
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Bishop GG, Wiegman P, McNamara C, Din S, Sanders J, Hesselbacher S, Feldman M, McPherson JA, Humphries JE, Hammarskjold ML, Gimple LW, Ragosta M, Powers ER, Dickek D, Owens GK, Sarembock IJ. Local adenovirus-mediated delivery of hirudin in a rabbit arterial injury model. J Vasc Res 1999; 36:343-52; discussion 430-3. [PMID: 10559674 DOI: 10.1159/000025672] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
UNLABELLED Intravascular delivery of an E1/E3 deleted adenovirus encoding the hirudin protein reduces neointimal formation in the rat arterial injury model. Given the interspecies variability in response to adenoviral vectors, we tested this same construct in the hirudin-sensitive cholesterol-fed rabbit arterial balloon injury model. We hypothesized that local delivery of an E1/E3-deleted adenovirus encoding hirudin (Ad-Hir) in addition to early hirudin infusion would limit neointimal formation compared to early hirudin alone. METHODS AND RESULTS Local delivery of Ad-Hir, 2.5 x 10(10) PFU/ml, using a double balloon catheter [n = 6 vessels (v)] produced a 79% reduction in vessel wall thrombin activity at 48 h after balloon angioplasty (BA) compared with vehicle (Veh, n = 6v; p = 0. 05). In chronic experiments, hypercholesterolemic rabbits underwent femoral BA, and received either early hirudin alone (n = 9v) or early hirudin plus locally delivered Ad-Hir (early hirudin + Ad-Hir; n = 9v), an E1/E3-deleted adenovirus encoding beta-galactosidase (early hirudin + AdGal; n = 7v), or Veh (early hirudin + Veh; n = 10v). Early hirudin + Ad-Hir did not limit the arterial response to injury versus the other groups at 4 weeks after BA. Plaque area, cross-sectional luminal area narrowing by plaque, and T cell infiltration were significantly increased in the adenovirus- versus non-adenovirus-treated arteries. Plaque area correlated with T cell density. CONCLUSION Following BA in cholesterol-fed rabbits, local transduction with A-Hir produced a marked reduction in vessel wall-associated thrombin activity. However, this strategy increased rather than decreased the arterial response to BA injury. Our results suggest that the lack of therapeutic effect resulted from adenovirus-stimulated plaque formation, possibly resulting from a T cell-mediated inflammatory response.
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Affiliation(s)
- G G Bishop
- Department of Medicine, Cardiovascular Division, University of Virginia Health Science Center, Charlottesville, VA 22908, USA
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Dutta A, Din S, Brill SJ, Stillman B. Phosphorylation of replication protein A: a role for cdc2 kinase in G1/S regulation. Cold Spring Harb Symp Quant Biol 1991; 56:315-24. [PMID: 1840253 DOI: 10.1101/sqb.1991.056.01.038] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- A Dutta
- Cold Spring Harbor Laboratory, New York 11724
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Abstract
Replication factor A (RF-A) is a multisubunit, cellular protein that functions with SV40 T antigen during the initiation stage of DNA replication at the SV40 origin. It also cooperates with other replication factors to stimulate the activity of both polymerases alpha and delta during chain elongation. RF-A from both human and yeast cells is phosphorylated in a cell-cycle-dependent manner; the protein is phosphorylated at the G1- to S-phase transition, and dephosphorylation occurs at mitosis, thereby resetting this cycle. This observation provides a direct link between a protein required for DNA replication and cell-cycle-regulated protein phosphorylation.
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Affiliation(s)
- S Din
- Cold Spring Harbor Laboratory, New York 11724
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