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Maghini DG, Dvorak M, Dahlen A, Roos M, Kuersten S, Bhatt AS. Quantifying bias introduced by sample collection in relative and absolute microbiome measurements. Nat Biotechnol 2024; 42:328-338. [PMID: 37106038 DOI: 10.1038/s41587-023-01754-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [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] [Received: 09/28/2022] [Accepted: 03/21/2023] [Indexed: 04/29/2023]
Abstract
To gain insight into the accuracy of microbial measurements, it is important to evaluate sources of bias related to sample condition, preservative method and bioinformatic analyses. There is increasing evidence that measurement of the total count and concentration of microbes in the gut, or 'absolute abundance', provides a richer source of information than relative abundance and can correct some conclusions drawn from relative abundance data. However, little is known about how preservative choice can affect these measurements. In this study, we investigated how two common preservatives and short-term storage conditions impact relative and absolute microbial measurements. OMNIgene GUT OMR-200 yields lower metagenomic taxonomic variation between different storage temperatures, whereas Zymo DNA/RNA Shield yields lower metatranscriptomic taxonomic variation. Absolute abundance quantification reveals two different causes of variable Bacteroidetes:Firmicutes ratios across preservatives. Based on these results, we recommend OMNIgene GUT OMR-200 preservative for field studies and Zymo DNA/RNA Shield for metatranscriptomics studies, and we strongly encourage absolute quantification for microbial measurements.
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Affiliation(s)
- Dylan G Maghini
- Department of Genetics, Stanford University, Stanford, CA, USA
| | - Mai Dvorak
- Department of Biology, Stanford University, Stanford, CA, USA
| | - Alex Dahlen
- Quantitative Sciences Unit, Stanford University, Stanford, CA, USA
| | | | | | - Ami S Bhatt
- Department of Genetics, Stanford University, Stanford, CA, USA.
- Department of Medicine (Hematology, Blood and Marrow Transplantation), Stanford University, Stanford, CA, USA.
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2
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Sinha R, Dvorak M, Ganesan A, Kalesinskas L, Niemeyer CM, Flotho C, Sakamoto KM, Lacayo N, Patil RV, Perriman R, Cepika AM, Liu YL, Kuo A, Utz PJ, Khatri P, Bertaina A. Epigenetic Profiling of PTPN11 Mutant JMML Hematopoietic Stem and Progenitor Cells Reveals an Aberrant Histone Landscape. Cancers (Basel) 2023; 15:5204. [PMID: 37958378 PMCID: PMC10650722 DOI: 10.3390/cancers15215204] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 10/18/2023] [Accepted: 10/27/2023] [Indexed: 11/15/2023] Open
Abstract
Juvenile myelomonocytic leukemia (JMML) is a deadly pediatric leukemia driven by RAS pathway mutations, of which >35% are gain-of-function in PTPN11. Although DNA hypermethylation portends severe clinical phenotypes, the landscape of histone modifications and chromatin profiles in JMML patient cells have not been explored. Using global mass cytometry, Epigenetic Time of Flight (EpiTOF), we analyzed hematopoietic stem and progenitor cells (HSPCs) from five JMML patients with PTPN11 mutations. These data revealed statistically significant changes in histone methylation, phosphorylation, and acetylation marks that were unique to JMML HSPCs when compared with healthy controls. Consistent with these data, assay for transposase-accessible chromatin with sequencing (ATAC-seq) analysis revealed significant alterations in chromatin profiles at loci encoding post-translational modification enzymes, strongly suggesting their mis-regulated expression. Collectively, this study reveals histone modification pathways as an additional epigenetic abnormality in JMML patient HSPCs, thereby uncovering a new family of potential druggable targets for the treatment of JMML.
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Affiliation(s)
- Roshani Sinha
- Division of Hematology, Oncology, Stem Cell Transplantation and Regenerative Medicine, Department of Pediatrics, School of Medicine, Stanford University, Stanford, CA 94305, USA; (R.S.); (R.V.P.); (R.P.); (A.-M.C.); (Y.L.L.)
| | - Mai Dvorak
- Department of Medicine, School of Medicine, Stanford University, Stanford, CA 94305, USA; (M.D.); (A.G.); (L.K.); (A.K.); (P.J.U.); (P.K.)
| | - Ananthakrishnan Ganesan
- Department of Medicine, School of Medicine, Stanford University, Stanford, CA 94305, USA; (M.D.); (A.G.); (L.K.); (A.K.); (P.J.U.); (P.K.)
| | - Larry Kalesinskas
- Department of Medicine, School of Medicine, Stanford University, Stanford, CA 94305, USA; (M.D.); (A.G.); (L.K.); (A.K.); (P.J.U.); (P.K.)
| | - Charlotte M. Niemeyer
- Department of Pediatric Hematology and Oncology, University of Freiburg Medical Centre, 79098 Freiburg im Breisgau, Germany; (C.M.N.); (C.F.)
| | - Christian Flotho
- Department of Pediatric Hematology and Oncology, University of Freiburg Medical Centre, 79098 Freiburg im Breisgau, Germany; (C.M.N.); (C.F.)
| | - Kathleen M. Sakamoto
- Bass Center for Childhood Cancer and Blood Disorders at Lucile Packard Children’s Hospital, Palo Alto, CA 94304, USA; (K.M.S.); (N.L.)
| | - Norman Lacayo
- Bass Center for Childhood Cancer and Blood Disorders at Lucile Packard Children’s Hospital, Palo Alto, CA 94304, USA; (K.M.S.); (N.L.)
| | - Rachana Vinay Patil
- Division of Hematology, Oncology, Stem Cell Transplantation and Regenerative Medicine, Department of Pediatrics, School of Medicine, Stanford University, Stanford, CA 94305, USA; (R.S.); (R.V.P.); (R.P.); (A.-M.C.); (Y.L.L.)
| | - Rhonda Perriman
- Division of Hematology, Oncology, Stem Cell Transplantation and Regenerative Medicine, Department of Pediatrics, School of Medicine, Stanford University, Stanford, CA 94305, USA; (R.S.); (R.V.P.); (R.P.); (A.-M.C.); (Y.L.L.)
| | - Alma-Martina Cepika
- Division of Hematology, Oncology, Stem Cell Transplantation and Regenerative Medicine, Department of Pediatrics, School of Medicine, Stanford University, Stanford, CA 94305, USA; (R.S.); (R.V.P.); (R.P.); (A.-M.C.); (Y.L.L.)
| | - Yunying Lucy Liu
- Division of Hematology, Oncology, Stem Cell Transplantation and Regenerative Medicine, Department of Pediatrics, School of Medicine, Stanford University, Stanford, CA 94305, USA; (R.S.); (R.V.P.); (R.P.); (A.-M.C.); (Y.L.L.)
| | - Alex Kuo
- Department of Medicine, School of Medicine, Stanford University, Stanford, CA 94305, USA; (M.D.); (A.G.); (L.K.); (A.K.); (P.J.U.); (P.K.)
| | - Paul J. Utz
- Department of Medicine, School of Medicine, Stanford University, Stanford, CA 94305, USA; (M.D.); (A.G.); (L.K.); (A.K.); (P.J.U.); (P.K.)
| | - Purvesh Khatri
- Department of Medicine, School of Medicine, Stanford University, Stanford, CA 94305, USA; (M.D.); (A.G.); (L.K.); (A.K.); (P.J.U.); (P.K.)
| | - Alice Bertaina
- Division of Hematology, Oncology, Stem Cell Transplantation and Regenerative Medicine, Department of Pediatrics, School of Medicine, Stanford University, Stanford, CA 94305, USA; (R.S.); (R.V.P.); (R.P.); (A.-M.C.); (Y.L.L.)
- Bass Center for Childhood Cancer and Blood Disorders at Lucile Packard Children’s Hospital, Palo Alto, CA 94304, USA; (K.M.S.); (N.L.)
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3
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Slight-Webb S, Thomas K, Smith M, Wagner CA, Macwana S, Bylinska A, Donato M, Dvorak M, Chang SE, Kuo A, Cheung P, Kalesinskas L, Ganesan A, Dermadi D, Guthridge CJ, DeJager W, Wright C, Foecke MH, Merrill JT, Chakravarty E, Arriens C, Maecker HT, Khatri P, Utz PJ, James JA, Guthridge JM. Ancestry-based differences in the immune phenotype are associated with lupus activity. JCI Insight 2023; 8:e169584. [PMID: 37606045 PMCID: PMC10543734 DOI: 10.1172/jci.insight.169584] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Accepted: 07/10/2023] [Indexed: 08/23/2023] Open
Abstract
Systemic lupus erythematosus (SLE) affects 1 in 537 Black women, which is >2-fold more than White women. Black patients develop the disease at a younger age, have more severe symptoms, and have a greater chance of early mortality. We used a multiomics approach to uncover ancestry-associated immune alterations in patients with SLE and healthy controls that may contribute biologically to disease disparities. Cell composition, signaling, epigenetics, and proteomics were evaluated by mass cytometry; droplet-based single-cell transcriptomics and proteomics; and bead-based multiplex soluble mediator levels in plasma. We observed altered whole blood frequencies and enhanced activity in CD8+ T cells, B cells, monocytes, and DCs in Black patients with more active disease. Epigenetic modifications in CD8+ T cells (H3K27ac) could distinguish disease activity level in Black patients and differentiate Black from White patient samples. TLR3/4/7/8/9-related gene expression was elevated in immune cells from Black patients with SLE, and TLR7/8/9 and IFN-α phospho-signaling and cytokine responses were heightened even in immune cells from healthy Black control patients compared with White individuals. TLR stimulation of healthy immune cells recapitulated the ancestry-associated SLE immunophenotypes. This multiomic resource defines ancestry-associated immune phenotypes that differ between Black and White patients with SLE, which may influence the course and severity of SLE and other diseases.
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Affiliation(s)
- Samantha Slight-Webb
- Department of Arthritis and Clinical Immunology, Oklahoma Medical Research Foundation (OMRF), Oklahoma City, Oklahoma, USA
| | - Kevin Thomas
- Department of Arthritis and Clinical Immunology, Oklahoma Medical Research Foundation (OMRF), Oklahoma City, Oklahoma, USA
- Departments of Medicine and Pathology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA
| | - Miles Smith
- Department of Arthritis and Clinical Immunology, Oklahoma Medical Research Foundation (OMRF), Oklahoma City, Oklahoma, USA
| | - Catriona A. Wagner
- Department of Arthritis and Clinical Immunology, Oklahoma Medical Research Foundation (OMRF), Oklahoma City, Oklahoma, USA
| | - Susan Macwana
- Department of Arthritis and Clinical Immunology, Oklahoma Medical Research Foundation (OMRF), Oklahoma City, Oklahoma, USA
| | - Aleksandra Bylinska
- Department of Arthritis and Clinical Immunology, Oklahoma Medical Research Foundation (OMRF), Oklahoma City, Oklahoma, USA
- Departments of Medicine and Pathology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA
| | - Michele Donato
- Institute for Immunity, Transplantation and Infection
- Center for Biomedical Informatics Research, Department of Medicine; and
| | - Mai Dvorak
- Institute for Immunity, Transplantation and Infection
- Center for Biomedical Informatics Research, Department of Medicine; and
| | | | - Alex Kuo
- Division of Immunology and Rheumatology, Department of Medicine, Stanford University School of Medicine, Stanford, California, USA
| | - Peggie Cheung
- Division of Immunology and Rheumatology, Department of Medicine, Stanford University School of Medicine, Stanford, California, USA
| | - Laurynas Kalesinskas
- Institute for Immunity, Transplantation and Infection
- Center for Biomedical Informatics Research, Department of Medicine; and
| | - Ananthakrishnan Ganesan
- Institute for Immunity, Transplantation and Infection
- Center for Biomedical Informatics Research, Department of Medicine; and
| | - Denis Dermadi
- Institute for Immunity, Transplantation and Infection
- Center for Biomedical Informatics Research, Department of Medicine; and
| | - Carla J. Guthridge
- Department of Arthritis and Clinical Immunology, Oklahoma Medical Research Foundation (OMRF), Oklahoma City, Oklahoma, USA
| | - Wade DeJager
- Department of Arthritis and Clinical Immunology, Oklahoma Medical Research Foundation (OMRF), Oklahoma City, Oklahoma, USA
| | - Christian Wright
- Department of Arthritis and Clinical Immunology, Oklahoma Medical Research Foundation (OMRF), Oklahoma City, Oklahoma, USA
| | - Mariko H. Foecke
- Division of Immunology and Rheumatology, Department of Medicine, Stanford University School of Medicine, Stanford, California, USA
| | - Joan T. Merrill
- Department of Arthritis and Clinical Immunology, Oklahoma Medical Research Foundation (OMRF), Oklahoma City, Oklahoma, USA
| | - Eliza Chakravarty
- Department of Arthritis and Clinical Immunology, Oklahoma Medical Research Foundation (OMRF), Oklahoma City, Oklahoma, USA
| | - Cristina Arriens
- Department of Arthritis and Clinical Immunology, Oklahoma Medical Research Foundation (OMRF), Oklahoma City, Oklahoma, USA
- Departments of Medicine and Pathology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA
| | | | - Purvesh Khatri
- Institute for Immunity, Transplantation and Infection
- Center for Biomedical Informatics Research, Department of Medicine; and
| | - Paul J. Utz
- Division of Immunology and Rheumatology, Department of Medicine, Stanford University School of Medicine, Stanford, California, USA
| | - Judith A. James
- Department of Arthritis and Clinical Immunology, Oklahoma Medical Research Foundation (OMRF), Oklahoma City, Oklahoma, USA
- Departments of Medicine and Pathology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA
| | - Joel M. Guthridge
- Department of Arthritis and Clinical Immunology, Oklahoma Medical Research Foundation (OMRF), Oklahoma City, Oklahoma, USA
- Departments of Medicine and Pathology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA
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4
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Bai L, Dermadi D, Kalesinskas L, Dvorak M, Chang SE, Ganesan A, Rubin SJS, Kuo A, Cheung P, Donato M, Utz PJ, Habtezion A, Khatri P. Mass-cytometry-based quantitation of global histone post-translational modifications at single-cell resolution across peripheral immune cells in IBD. J Crohns Colitis 2022; 17:804-815. [PMID: 36571819 PMCID: PMC10155749 DOI: 10.1093/ecco-jcc/jjac194] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [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] [Received: 02/10/2022] [Indexed: 01/26/2023]
Abstract
BACKGROUND AND AIMS Current understanding of histone post-translational modifications (histone modifications) across immune cell types in patients with inflammatory bowel disease (IBD) during remission and flare is limited. The study aimed to quantify histone modifications at a single-cell resolution in IBD patients during remission and flare and how they differ compared to healthy controls. METHODS We performed a case-control study of 94 subjects (83 IBD patients and 11 healthy controls). IBD patients had either UC (n=38) or CD (n=45) in clinical remission or flare. We used epigenetic profiling by time-of-flight (EpiTOF) to investigate changes in histone modifications within peripheral blood mononuclear cells from IBD patients. RESULTS We discovered substantial heterogeneity in histone modifications across multiple immune cell types in IBD patients. They had a higher proportion of less differentiated CD34 + hematopoietic progenitors, and a subset of CD56 bright NK cells and γδ T cells characterized by distinct histone modifications associated with the gene transcription. The subset of CD56 bright NK cells had increased several histone acetylations. An epigenetically defined subset of NK was associated with higher levels of CRP in peripheral blood. CD14+ monocytes from IBD patients had significantly decreased cleaved H3T22, suggesting they were epigenetically primed for macrophage differentiation. CONCLUSION We describe the first systems-level quantification of histone modifications across immune cells from IBD patients at a single-cell resolution revealing the increased epigenetic heterogeneity that is not possible with traditional ChIP-seq profiling. Our data open new directions in investigating the association between histone modifications and IBD pathology using other epigenomic tools.
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Affiliation(s)
- Lawrence Bai
- Immunology Program, Stanford University School of Medicine, 1215 Welch Road, Modular B, Stanford, CA 94305 USA
| | - Denis Dermadi
- Institute for Immunity, Transplantation and Infection, School of Medicine, Stanford University, Stanford, CA 94305, USA.,Center for Biomedical Informatics Research, Department of Medicine, Stanford University, Stanford, CA 94305, USA
| | - Laurynas Kalesinskas
- Biomedical Informatics Training Program, Stanford University School of Medicine, 1265 Welch Road, MSOB X-343, Stanford, CA 94305 USA
| | - Mai Dvorak
- Institute for Immunity, Transplantation and Infection, School of Medicine, Stanford University, Stanford, CA 94305, USA.,Division of Immunology and Rheumatology, Department of Medicine, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Sarah E Chang
- Institute for Immunity, Transplantation and Infection, School of Medicine, Stanford University, Stanford, CA 94305, USA.,Division of Immunology and Rheumatology, Department of Medicine, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Ananthakrishnan Ganesan
- Computational and Mathematical Engineering, Stanford University, 475 Via Ortega, Suite B060, Stanford, CA 94305 USA
| | - Samuel J S Rubin
- Division of Gastroenterology and Hepatology, Department of Medicine, Stanford University School of Medicine, Stanford, CA 94305, United States
| | - Alex Kuo
- Institute for Immunity, Transplantation and Infection, School of Medicine, Stanford University, Stanford, CA 94305, USA.,Division of Immunology and Rheumatology, Department of Medicine, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Peggie Cheung
- Institute for Immunity, Transplantation and Infection, School of Medicine, Stanford University, Stanford, CA 94305, USA.,Division of Immunology and Rheumatology, Department of Medicine, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Michele Donato
- Institute for Immunity, Transplantation and Infection, School of Medicine, Stanford University, Stanford, CA 94305, USA.,Center for Biomedical Informatics Research, Department of Medicine, Stanford University, Stanford, CA 94305, USA
| | - Paul J Utz
- Immunology Program, Stanford University School of Medicine, 1215 Welch Road, Modular B, Stanford, CA 94305 USA.,Institute for Immunity, Transplantation and Infection, School of Medicine, Stanford University, Stanford, CA 94305, USA.,Division of Immunology and Rheumatology, Department of Medicine, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Aida Habtezion
- Immunology Program, Stanford University School of Medicine, 1215 Welch Road, Modular B, Stanford, CA 94305 USA.,Institute for Immunity, Transplantation and Infection, School of Medicine, Stanford University, Stanford, CA 94305, USA.,Division of Gastroenterology and Hepatology, Department of Medicine, Stanford University School of Medicine, Stanford, CA 94305, United States
| | - Purvesh Khatri
- Immunology Program, Stanford University School of Medicine, 1215 Welch Road, Modular B, Stanford, CA 94305 USA.,Institute for Immunity, Transplantation and Infection, School of Medicine, Stanford University, Stanford, CA 94305, USA.,Center for Biomedical Informatics Research, Department of Medicine, Stanford University, Stanford, CA 94305, USA
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5
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Yablonsky K, Dvorak M. 321 Goals of care and advanced care planning in cystic fibrosis: A quality improvement journey. J Cyst Fibros 2022. [DOI: 10.1016/s1569-1993(22)01011-6] [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: 11/07/2022]
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Georgiopoulos A, Smith B, Sher Y, Bruce A, He J, Kim J, Chaudhary N, Hardcastle M, Pollinger S, Polineni D, Mohabir P, Shea N, Roach C, Richards C, Miller C, Dvorak M, Quittner A, Friedman D. 312 Barriers to sustaining daily care in adults with cystic fibrosis with mild depression and anxiety. J Cyst Fibros 2022. [DOI: 10.1016/s1569-1993(22)01002-5] [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: 11/07/2022]
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7
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Friedman D, Smith B, Sher Y, Bruce A, Chaudhary N, Hardcastle M, Pollinger S, Polineni D, Mohabir P, Shea N, Roach C, Miller C, Richards C, Dvorak M, Quittner A, Georgiopoulos A. 302: Perceived stress and quality of life in adults with CF with mild depression and anxiety. J Cyst Fibros 2021. [DOI: 10.1016/s1569-1993(21)01727-6] [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]
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8
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Wimmers F, Donato M, Kuo A, Ashuach T, Gupta S, Li C, Dvorak M, Foecke MH, Chang SE, Hagan T, De Jong SE, Maecker HT, van der Most R, Cheung P, Cortese M, Bosinger SE, Davis M, Rouphael N, Subramaniam S, Yosef N, Utz PJ, Khatri P, Pulendran B. The single-cell epigenomic and transcriptional landscape of immunity to influenza vaccination. Cell 2021; 184:3915-3935.e21. [PMID: 34174187 PMCID: PMC8316438 DOI: 10.1016/j.cell.2021.05.039] [Citation(s) in RCA: 110] [Impact Index Per Article: 36.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Revised: 03/15/2021] [Accepted: 05/25/2021] [Indexed: 12/13/2022]
Abstract
Emerging evidence indicates a fundamental role for the epigenome in immunity. Here, we mapped the epigenomic and transcriptional landscape of immunity to influenza vaccination in humans at the single-cell level. Vaccination against seasonal influenza induced persistently diminished H3K27ac in monocytes and myeloid dendritic cells (mDCs), which was associated with impaired cytokine responses to Toll-like receptor stimulation. Single-cell ATAC-seq analysis revealed an epigenomically distinct subcluster of monocytes with reduced chromatin accessibility at AP-1-targeted loci after vaccination. Similar effects were observed in response to vaccination with the AS03-adjuvanted H5N1 pandemic influenza vaccine. However, this vaccine also stimulated persistently increased chromatin accessibility at interferon response factor (IRF) loci in monocytes and mDCs. This was associated with elevated expression of antiviral genes and heightened resistance to the unrelated Zika and Dengue viruses. These results demonstrate that vaccination stimulates persistent epigenomic remodeling of the innate immune system and reveal AS03's potential as an epigenetic adjuvant.
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Affiliation(s)
- Florian Wimmers
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Michele Donato
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, CA 94305, USA; Department of Medicine, Division of Biomedical Informatics Research, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Alex Kuo
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, CA 94305, USA; Department of Medicine, Division of Immunology and Rheumatology, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Tal Ashuach
- Department of Electrical Engineering and Computer Sciences and Center for Computational Biology, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Shakti Gupta
- Department of Bioengineering, University of California, San Diego, 9500 Gilman Drive MC 0412, La Jolla, CA 92093, USA
| | - Chunfeng Li
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Mai Dvorak
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, CA 94305, USA; Department of Medicine, Division of Immunology and Rheumatology, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Mariko Hinton Foecke
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, CA 94305, USA; Department of Medicine, Division of Immunology and Rheumatology, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Sarah E Chang
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, CA 94305, USA; Department of Medicine, Division of Immunology and Rheumatology, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Thomas Hagan
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Sanne E De Jong
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Holden T Maecker
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, CA 94305, USA
| | | | - Peggie Cheung
- Department of Medicine, Division of Immunology and Rheumatology, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Mario Cortese
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Steven E Bosinger
- Emory Vaccine Center, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Mark Davis
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, CA 94305, USA; Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, CA 94305, USA; Howard Hughes Medical Institute, Stanford University, Stanford, CA 94305, USA
| | - Nadine Rouphael
- Hope Clinic of the Emory Vaccine Center, Department of Medicine, Division of Infectious Diseases, Emory University School of Medicine, Decatur, GA 30030, USA
| | - Shankar Subramaniam
- Department of Bioengineering, University of California, San Diego, 9500 Gilman Drive MC 0412, La Jolla, CA 92093, USA
| | - Nir Yosef
- Department of Electrical Engineering and Computer Sciences and Center for Computational Biology, University of California, Berkeley, Berkeley, CA 94720, USA; Chan-Zuckerberg Biohub, San Francisco, CA, USA
| | - Paul J Utz
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, CA 94305, USA; Department of Medicine, Division of Immunology and Rheumatology, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Purvesh Khatri
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, CA 94305, USA; Department of Medicine, Division of Biomedical Informatics Research, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Bali Pulendran
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, CA 94305, USA; Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, CA 94305, USA; Department of Pathology, Stanford University School of Medicine, Stanford, CA 94305, USA.
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9
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Cheung P, Vallania F, Dvorak M, Chang SE, Schaffert S, Donato M, Rao AM, Mao R, Utz PJ, Khatri P, Kuo AJ. Single-cell epigenetics - Chromatin modification atlas unveiled by mass cytometry. Clin Immunol 2018; 196:40-48. [PMID: 29960011 DOI: 10.1016/j.clim.2018.06.009] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2018] [Revised: 06/21/2018] [Accepted: 06/22/2018] [Indexed: 12/13/2022]
Abstract
Modifications of histone proteins are fundamental to the regulation of epigenetic phenotypes. Dysregulations of histone modifications have been linked to the pathogenesis of diverse human diseases. However, identifying differential histone modifications in patients with immune-mediated diseases has been challenging, in part due to the lack of a powerful analytic platform to study histone modifications in the complex human immune system. We recently developed a highly multiplexed platform, Epigenetic landscape profiling using cytometry by Time-Of-Flight (EpiTOF), to analyze the global levels of a broad array of histone modifications in single cells using mass cytometry. In this review, we summarize the development of EpiTOF and discuss its potential applications in biomedical research. We anticipate that this platform will provide new insights into the roles of epigenetic regulation in hematopoiesis, immune cell functions, and immune system aging, and reveal aberrant epigenetic patterns associated with immune-mediated diseases.
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Affiliation(s)
- Peggie Cheung
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, California 94305, USA; Department of Medicine, Division of Immunology and Rheumatology, Stanford University School of Medicine, Stanford, California 94305, USA
| | - Francesco Vallania
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, California 94305, USA; Department of Medicine, Division of Biomedical Informatics Research, Stanford University School of Medicine, Stanford, California 94305, USA
| | - Mai Dvorak
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, California 94305, USA; Department of Medicine, Division of Immunology and Rheumatology, Stanford University School of Medicine, Stanford, California 94305, USA
| | - Sarah E Chang
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, California 94305, USA; Department of Medicine, Division of Immunology and Rheumatology, Stanford University School of Medicine, Stanford, California 94305, USA
| | - Steven Schaffert
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, California 94305, USA; Department of Medicine, Division of Biomedical Informatics Research, Stanford University School of Medicine, Stanford, California 94305, USA
| | - Michele Donato
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, California 94305, USA; Department of Medicine, Division of Biomedical Informatics Research, Stanford University School of Medicine, Stanford, California 94305, USA
| | - Aditya M Rao
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, California 94305, USA; Department of Medicine, Division of Biomedical Informatics Research, Stanford University School of Medicine, Stanford, California 94305, USA
| | - Rong Mao
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, California 94305, USA; Department of Medicine, Division of Immunology and Rheumatology, Stanford University School of Medicine, Stanford, California 94305, USA
| | - Paul J Utz
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, California 94305, USA; Department of Medicine, Division of Immunology and Rheumatology, Stanford University School of Medicine, Stanford, California 94305, USA.
| | - Purvesh Khatri
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, California 94305, USA; Department of Medicine, Division of Biomedical Informatics Research, Stanford University School of Medicine, Stanford, California 94305, USA.
| | - Alex J Kuo
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, California 94305, USA; Department of Medicine, Division of Immunology and Rheumatology, Stanford University School of Medicine, Stanford, California 94305, USA.
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Cheung P, Vallania F, Warsinske HC, Donato M, Schaffert S, Chang SE, Dvorak M, Dekker CL, Davis MM, Utz PJ, Khatri P, Kuo AJ. Single-Cell Chromatin Modification Profiling Reveals Increased Epigenetic Variations with Aging. Cell 2018; 173:1385-1397.e14. [PMID: 29706550 PMCID: PMC5984186 DOI: 10.1016/j.cell.2018.03.079] [Citation(s) in RCA: 205] [Impact Index Per Article: 34.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2018] [Revised: 02/27/2018] [Accepted: 03/28/2018] [Indexed: 12/17/2022]
Abstract
Post-translational modifications of histone proteins and exchanges of histone variants of chromatin are central to the regulation of nearly all DNA-templated biological processes. However, the degree and variability of chromatin modifications in specific human immune cells remain largely unknown. Here, we employ a highly multiplexed mass cytometry analysis to profile the global levels of a broad array of chromatin modifications in primary human immune cells at the single-cell level. Our data reveal markedly different cell-type- and hematopoietic-lineage-specific chromatin modification patterns. Differential analysis between younger and older adults shows that aging is associated with increased heterogeneity between individuals and elevated cell-to-cell variability in chromatin modifications. Analysis of a twin cohort unveils heritability of chromatin modifications and demonstrates that aging-related chromatin alterations are predominantly driven by non-heritable influences. Together, we present a powerful platform for chromatin and immunology research. Our discoveries highlight the profound impacts of aging on chromatin modifications.
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Affiliation(s)
- Peggie Cheung
- Institute for Immunity, Transplantation, and Infection, Stanford University School of Medicine, Stanford, CA 94305, USA; Department of Medicine, Division of Immunology and Rheumatology, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Francesco Vallania
- Institute for Immunity, Transplantation, and Infection, Stanford University School of Medicine, Stanford, CA 94305, USA; Department of Medicine, Division of Biomedical Informatics Research, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Hayley C Warsinske
- Institute for Immunity, Transplantation, and Infection, Stanford University School of Medicine, Stanford, CA 94305, USA; Department of Medicine, Division of Biomedical Informatics Research, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Michele Donato
- Institute for Immunity, Transplantation, and Infection, Stanford University School of Medicine, Stanford, CA 94305, USA; Department of Medicine, Division of Biomedical Informatics Research, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Steven Schaffert
- Institute for Immunity, Transplantation, and Infection, Stanford University School of Medicine, Stanford, CA 94305, USA; Department of Medicine, Division of Biomedical Informatics Research, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Sarah E Chang
- Institute for Immunity, Transplantation, and Infection, Stanford University School of Medicine, Stanford, CA 94305, USA; Department of Medicine, Division of Immunology and Rheumatology, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Mai Dvorak
- Institute for Immunity, Transplantation, and Infection, Stanford University School of Medicine, Stanford, CA 94305, USA; Department of Medicine, Division of Immunology and Rheumatology, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Cornelia L Dekker
- Department of Pediatrics, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Mark M Davis
- Institute for Immunity, Transplantation, and Infection, Stanford University School of Medicine, Stanford, CA 94305, USA; Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, CA 94304, USA; Howard Hughes Medical Institute, Stanford University School of Medicine, Stanford, CA 94304, USA
| | - Paul J Utz
- Institute for Immunity, Transplantation, and Infection, Stanford University School of Medicine, Stanford, CA 94305, USA; Department of Medicine, Division of Immunology and Rheumatology, Stanford University School of Medicine, Stanford, CA 94305, USA.
| | - Purvesh Khatri
- Institute for Immunity, Transplantation, and Infection, Stanford University School of Medicine, Stanford, CA 94305, USA; Department of Medicine, Division of Biomedical Informatics Research, Stanford University School of Medicine, Stanford, CA 94305, USA.
| | - Alex J Kuo
- Institute for Immunity, Transplantation, and Infection, Stanford University School of Medicine, Stanford, CA 94305, USA; Department of Medicine, Division of Immunology and Rheumatology, Stanford University School of Medicine, Stanford, CA 94305, USA.
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Bydzovsky J, Jackulikova M, Kalatova H, Dvorak M, Bulkova K. Ultrasound Examination in Healthcare Facilities of Refugee Camps. CSWHI 2018. [DOI: 10.22359/cswhi_9_1_01] [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: 11/23/2022]
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Kandziora F, Schleicher P, Schnake KJ, Reinhold M, Aarabi B, Bellabarba C, Chapman J, Dvorak M, Fehlings M, Grossman R, Kepler CK, Öner C, Shanmuganathan R, Vialle LR, Vaccaro AR. [Erratum: The AOSpine classification case spinal injuries]. Z Orthop Unfall 2016; 154:192-4. [PMID: 27075053 DOI: 10.1055/s-0042-104952] [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] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- F Kandziora
- Zentrum für Wirbelsäulenchirurgie und Neurotraumatologie, Berufsgenossenschaftliche Unfallklinik, Frankfurt am Main
| | - P Schleicher
- Zentrum für Wirbelsäulenchirurgie und Neurotraumatologie, Berufsgenossenschaftliche Unfallklinik, Frankfurt am Main
| | - K J Schnake
- Zentrum für Wirbelsäulentherapie, Schön Klinik Nürnberg-Fürth
| | - M Reinhold
- Abteilung für Unfallchirurgie/Orthopädie, Klinikum Südstadt, Rostock
| | - B Aarabi
- Department of Neurosurgery, University of Maryland Medical Centre, College Park, Maryland, United States
| | - C Bellabarba
- Department of Orthopaedic Neurological Surgery, University of Washington School of Medicine, Harborview Medical Center, Seattle, Washington, United States
| | - J Chapman
- Department of Orthopaedic Neurological Surgery, University of Washington School of Medicine, Harborview Medical Center, Seattle, Washington, United States
| | - M Dvorak
- Department of Orthopaedics, University of British Columbia, Vancouver, Canada
| | - M Fehlings
- University of Toronto Spine Program and Toronto Western Hospital, University of Toronto, Toronto, Canada
| | - R Grossman
- Department of Neurosurgery, Methodist Neurological Institute, Houston, Texas, United States
| | - C K Kepler
- Rothman Institute, Thomas Jefferson University, Philadelphia, Pennsylvania, United States
| | - C Öner
- Spine Unit, University of Utrecht, School of Medicine, Utrecht, Netherlands
| | | | - L R Vialle
- Neurosurgery, Catholic University of Parana, Curitiba, Brazil
| | - A R Vaccaro
- Rothman Institute, Thomas Jefferson University, Philadelphia, Pennsylvania, United States
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Kandziora F, Schleicher P, Schnake K, Reinhold M, Aarabi B, Bellabarba C, Chapman J, Dvorak M, Fehlings M, Grossman R, Kepler C, Öner C, Shanmuganathan R, Vialle L, Vaccaro A. Die AOSpine-Klassifikation thorakolumbaler Wirbelsäulenverletzungen. Z Orthop Unfall 2016. [DOI: 10.1055/s-0041-108266] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- F. Kandziora
- Zentrum für Wirbelsäulenchirurgie und Neurotraumatologie, Berufsgenossenschaftliche Unfallklinik, Frankfurt am Main
| | - P. Schleicher
- Zentrum für Wirbelsäulenchirurgie und Neurotraumatologie, Berufsgenossenschaftliche Unfallklinik, Frankfurt am Main
| | - K. Schnake
- Zentrum für Wirbelsäulentherapie, Schön Klinik Nürnberg-Fürth
| | - M. Reinhold
- Abteilung für Unfallchirurgie/Orthopädie, Klinikum Südstadt, Rostock
| | - B. Aarabi
- Department of Neurosurgery, University of Maryland Medical Centre, College Park, Maryland, United States
| | - C. Bellabarba
- Department of Orthopaedic Neurological Surgery, University of Washington School of Medicine, Harborview Medical Center, Seattle, Washington, United States
| | - J. Chapman
- Department of Orthopaedic Neurological Surgery, University of Washington School of Medicine, Harborview Medical Center, Seattle, Washington, United States
| | - M. Dvorak
- Department of Orthopaedics, University of British Columbia, Vancouver, Canada
| | - M. Fehlings
- University of Toronto Spine Program and Toronto Western Hospital, University of Toronto, Toronto, Canada
| | - R. Grossman
- Department of Neurosurgery, Methodist Neurological Institute, Houston, Texas, United States
| | - C. Kepler
- Rothman Institute, Thomas Jefferson University, Philadelphia, Pennsylvania, United States
| | - C. Öner
- Spine Unit, University of Utrecht, School of Medicine, Utrecht, Netherlands
| | | | - L. Vialle
- Neurosurgery, Catholic University of Parana, Curitiba, Brazil
| | - A. Vaccaro
- Rothman Institute, Thomas Jefferson University, Philadelphia, Pennsylvania, United States
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Kandziora F, Schleicher P, Schnake KJ, Reinhold M, Aarabi B, Bellabarba C, Chapman J, Dvorak M, Fehlings M, Grossman R, Kepler CK, Öner C, Shanmuganathan R, Vialle LR, Vaccaro AR. [The AOSpine Classification of Thoraco-Lumbar Spine Injuries]. Z Orthop Unfall 2016; 154:35-42. [PMID: 27340713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Optimal treatment of injuries to the thoracolumbar spine is based on a detailed analysis of instability, as indicated by injury morphology and neurological status, together with significant modifying factors. A classification system helps to structure this analysis and should also provide guidance for treatment. Existing classification systems, such as the Magerl classification, are complex and do not include the neurological status, while the TLICS system has been accused of over-simplifying the influence of fracture morphology and instability. The AOSpine classification group has developed a new classification system, based mainly upon the Magerl and TLICS classifications, and with the aim of overcoming these drawbacks. This differentiates three main types of injury: Type A lesions are compression lesions to the anterior column; Type B lesions are distraction lesions of either the anterior or the posterior column; Type C lesions are translationally unstable lesions. Type A and B lesions are split into subgroups. The neurological damage is graded in 5 steps, ranging from a transient neurological deficit to complete spinal cord injury. Additional modifiers describe disorders which affect treatment strategy, such as osteoporosis or ankylosing diseases. Evaluations of intra- and inter-observer reliability have been very promising and encourage the introduction of this AOSpine classification of thoracolumbar injuries to the German speaking community.
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van West H, Hodgson B, Parent E, Samuel S, Hodgson B, Ferland C, Soroceanu A, Soroceanu A, Protopsaltis T, Protopsaltis T, Radovanovic I, Amritanand R, Shamji M, Haugo K, Malham G, Jarzem P, Rampersaud Y, Tomkins-Lane C, Manson N, Malham G, Rampersaud Y, Malham G, Malham G, King V, Goldstein C, Fisher C, Fehlings M, Fisher C, Wong E, Sardar Z, Christie S, Patel A, Pinkoski C, Ahn H, Drew B, Dvorak M, Pezeshki P, Altaf F, Wilde P, Rampersaud Y, Sparrey C, Tetreault L, Fehlings M, Tetreault L, Rampersaud R, Jack A, Johnstone R, Fernandes A, Urquhart J, Morokoff A, Manson N, Tomkins-Lane C, Phan P, Evaniew N, Shamji M, Manson J, Rampersaud Y, Nault ML, St-Pierre GH, Larouche J, Lewis S, Wilgenbusch C, Lewis S, Rampersaud Y, Johnson R, Cushnie D, Sridharan S, Street J, Gregg C, Missiuna P, Abraham E, Abraham E, Manson N, Huang E, Passmore S, Mac-Thiong JM, Labelle H, Moulin D, Turgeon I, Roy-Beaudry M, Bourassa N, Petit Y, Parent. S, Chabot S, Westover L, Hill D, Moreau M, Hedden D, Lou E, Adeeb. S, Smith M, Bridge C, Hsu B, Gray. R, Group PORSCHES, Saran N, Mac-Thiong JM, Stone L, Ouellet. J, Protopsaltis T, Terran J, Bronsard N, Smith J, Klineberg E, Mundis G, Hostin R, Hart R, Shaffrey C, Bess S, Ames C, Schwab F, Lafage. V, Schwab F, Lafage V, Protopsaltis T, Ames C, Bess S, Smith J, Errico. T, Schwab F, Soroceanu A, Bronsard N, Smith J, Klineberg E, Mundis G, Hostin R, Hart R, Burton D, Ames C, Shaffrey C, Bess S, Errico T, Lafage. V, Terran J, Soroceanu A, Bronsard N, Smith J, Klineberg E, Mundis G, Kim HJ, Hostin R, Hart R, Shaffrey C, Bess S, Ames C, Schwab F, Lafage. V, Urquhart J, Gananapathy V, Siddiqi F, Gurr K, Bailey C, Ravi B, David K, Rampersaud. R, Tu Y, Salter. M, Nichol H, Fourney D, Kelly. M, Parker R, Ellis N, Blecher C, Chow F, Claydon. M, Sardar Z, Alexander D, Oxner W, Plessis SD, Yee A, Wai. E, Lewis S, Davey J, Gandhi R, Mahomed. N, Hu R, Thomas K, Hepler C, Choi K, Rowed K, Haig. A, Lam. K, Parker R, Blecher C, Seex. K, Perruccio A, Gandhi R, Program. UHNA, Ellis N, Parker R, Goss B, Blecher C, Ballok. Z, Parker R, Ellis N, Chan P, Varma. D, Swart A, Winder M, Varga PP, Gokaslan Z, Boriani S, Luzzati A, Rhines L, Fisher C, Chou D, Williams R, Dekutoski M, Quraishi N, Bettegowda C, Kawahara N, Fehlings. M, Versteeg A, Boriani S, Varga PP, Dekutoski M, Luzzati A, Gokaslan Z, Williams R, Reynolds J, Fehlings M, Bettegowda C, Rhines. L, Zamorano J, Nater A, Tetrault L, Varga P, Gokaslan Z, Boriani S, Fisher C, Rhines L, Bettegowda C, Kawahara N, Chou. D, Fehlings M, Kopjar B, Vaccaro A, Arnold P, Schuster J, Finkelstein J, Rhines L, Dekutoski M, Gokaslan Z, France. J, Whyne C, Singh D, Ford. M, Aldebeyan W, Ouellet J, Steffen T, Beckman L, Weber M, Jarzem. P, Kwon B, Ahn H, Bailey C, Fehlings M, Fourney D, Gagnon D, Tsai E, Tsui D, Parent S, Chen J, Dvorak M, Noonan V, Rivers C, Network RHSCIR, Batke J, Lenehan B, Fisher C, Dvorak M, Street. J, Fox R, Nataraj A, Bailey C, Christie S, Duggal N, Fehlings M, Finkelstein J, Fourney D, Hurlbert R, Kwon B, Townson A, Tsai E, Attabib N, Chen J, Dvorak M, Noonan V, Rivers C, Network. RHSCIR, Fehlings M, Paquet J, Ahn H, Attabib N, Bailey C, Christie S, Duggal N, Finkelstein J, Fourney D, Hurlbert R, Johnson M, Kwon B, Parent S, Tsai E, Dvorak M, Noonan V, Rivers C, Shen T, Network. RHSCIR, Fisher C, Kwon B, Drew B, Fehlings M, Paquet J, Ahn H, Attabib N, Bailey C, Christie S, Duggal N, Finkelstein J, Fourney D, Hurlbert R, Johnson M, Mac-Thiong JM, Parent S, Tsai E, Fallah N, Noonan V, Rivers C, Network RHSCIR, Davidson S, McCann C, Akens M, Murphy K, Whyne C, Sherar M, Yee. A, Belanger L, Ronco J, Dea N, Paquette S, Boyd M, Street J, Fisher C, Dvorak M, Kwon B, Gonzalvo A, Fitt G, Liew S, de la Harpe D, Turner P, Rogers M, Bidos A, Fanti C, Young B, Drew B, Puskas. D, Tam H, Manansala S, Nosov V, Delva M, Alshafai N, Kopjar B, Tan G, Arnold P, Fehlings. M, Kopjar B, Arnold P, Ibrahim A, Tetrault. L, Kopjar B, Arnold P, Fehlings. M, Sundararajan K, Eng. S, St-Pierre G, Nataraj A, Urquhart J, Rosas-Arellano P, Tallon C, Gurr K, Siddiqi F, Bailey S, Bailey C, Sundararajan K, Rampersaud. R, Rosa-Arellano P, Tallon C, Bailey S, Gurr K, Bailey. C, Parker R, Milili L, Goss B, Malham. G, Green A, McKeon M, Abraham. E, Lafave L, Parnell J, Rempel J, Moriartey S, Andreas Y, Wilson P, Hepler C, Ray H, Hu. R, Ploumis A, Hess K, Wood. K, Yarascavitch B, Madden K, Ghert M, Drew B, Bhandari M, Kwok D, Tu YS, Salter. M, Hadlow. A, Tso P, Walker K, Lewis S, Davey J, Mahomed N, Coyte. P, Mac-Thiong JM, Roy-Beaudry M, Turgeon I, Labelle H, deGuise J, Parent. S, Jack A, Fox R, Nataraj A, Paquette S, Leroux T, Yee A, Ahn H, Broad R, Fisher C, Hall H, Nataraj A, Hedden D, Christie S, Carey T, Mehta V, Fehlings M, Wadey. V, Dear T, Hashem. M, Fourney D, Goldstein S, Bodrogi A, Lipkus M, Dear T, Keshen S, Veillette C, Gandhi R, Adams D, Briggs N, Davey J, Fehlings M, Lau J, Lewis S, Magtoto R, Marshall K, Massicotte E, Ogilvie-Harris D, Sarro A, Syed K, Mohamed. N, Perera S, Taha A, Urquhart J, Gurr K, Siddiqi F, Bailey C, Thomas K, Cho R, Swamy G, Power C, Henari S, Lenehan. B, McIntosh G, Hall H, Hoffman. C, Karachi A, Pazionis T, AlShaya O, Green A, McKeon M, Manson. N, Green A, McKeon M, Manson. N, Green A, McKeon M, Murray J, Abraham. E, Thomas K, Suttor S, Goyal T, Littlewood J, Bains I, Bouchard J, Hu R, Jacobs B, Cho R, Swamy G, Johnson M, Pelleck V, Amad Y, Ramos E, Glazebrook C. Combined Spine Conference of the Canadian Spine Society New Zealand Orthopaedic Spine Society, Spine Society of Australia: Fairmont Château Lake Louise, Lake, Louise, Alberta, Tuesday, Feb. 25 to Saturday, Mar. 1, 20141.1.01 The use of suspension radiographs to predict LIV tilt.1.1.02 Surgical correction of adolescent idiopathic scoliosis without fusion: an animal model.1.1.03 Are full torso surface topography postural measurements more sensitive to change than back only parameters in adolescents with idiopathic scoliosis and a main thoracic curve?1.2.04 Restoration of thoracic kyphosis in adolescent idiopathic kyphosis: comparative radiographic analysis of round versus rail rods.1.2.05 Scoliosis surgery in spastic quadriplegic cerebral palsy: Is fusion to the pelvis always necessary? A 4–18-year follow-up study.1.2.06 Identification and validation of pain-related biomarkers surrounding spinal surgery in adolescents.1.3.07 Cervical sagittal deformity develops after PJK in adult throacolumbar deformity correction: radiographic analysis using a novel global sagittal angular parameter, the CTPA.1.3.08 Impact of obesity on complications and patient-reported outcomes in adult spinal deformity surgery.1.3.09 The T1 pelvic angle, a novel radiographic measure of sagittal deformity, accounts for both pelvic retroversion and truncal inclination and correlates strongly with HRQOL.1.4.10 Determining cervical sagittal deformity when it is concurrent with thoracolumbar deformity.1.4.11 The influence of sagittal balance and pelvic parameters on the outcome of surgically treated patients with degenerative spondylolisthesis.1.4.12 Predictors of degenerative spondylolisthesis and loading translation in surgical lumbar spinal stenosis patients.2.1.13 Mechanical allodynia following disc herniation requires intraneural macrophage infiltration and can be blocked by systemic selenium delivery or attenuation of BDNF activity.2.1.14 The effect of alanyl-glutamine on epidural fibrosis in a rat laminectomy model.2.1.15 Anterior lumbar interbody fusion using recombinant human bone morphogenetic protein-2: a prospective study of complications.2.2.16 2-year results of a Canadian, multicentre, blinded, pilot study of a novel peptide in promoting lumbar spine fusion.2.2.17 Comparative outcomes and cost-utility following surgical treatment of focal lumbar spinal stenosis compared with osteoarthritis of the hip or knee: long-term change in health-related quality of life.2.2.18 Changes in objectively measured walking performance, function, and pain following surgery for spondylolisthesis and lumbar spinal stenosis.2.3.19 A prospective multicentre observational data-monitored study of minimally invasive fusion to treat degenerative lumbar disorders: complications and outcomes at 1-year follow-up.2.3.20 Assessment and classification of subsidence in lateral interbody fusion using serial computed tomography.2.3.21 Predictors of willingness to undergo spinal and orthopaedic surgery after surgical consultation.2.4.22 Indirect foraminal decompression is independent of facet arthropathy in extreme lateral interbody fusion.2.4.23 Cervical artificial disc replacement with ProDisc-C: clinical and radiographic outcomes with long-term follow-up.2.4.24 Tantalum trabecular metal implants in anterior cervical corpectomy and fusion.3.1.25 Hemangiomas of the spine: results of surgical management and prognostic variables for local recurrence and mortality in a multicentre study.3.1.26 Chondrosarcomas of the spine: prognostic variables for local recurrence and mortality in a multicentre study.3.1.27 Risk factors for recurrence of surgically treated spine schwannomas: analysis of 169 patients from a multicentre international database.3.2.28 Survival pattern and the effect of surgery on health related quality of life and functional outcome in patients with metastatic epidural spinal cord compression from lung cancer — the AOSpine North America prospective multicentre study.3.2.29 A biomechanical assessment of kyphoplasty as a stand-alone treatment in a human cadaveric burst fracture model.3.2.30 What is safer in incompetent vertebrae with posterior wall defects, kyphoplasty or vertebroplasty: a study in vertebral analogs.3.3.31 Feasibility of recruiting subjects for acute spinal cord injury (SCI) clinical trials in Canada.3.3.32 Prospective analysis of adverse events in elderly patients with traumatic spinal cord injury.3.3.33 Does traction before surgery influence time to neural decompression in patients with spinal cord injury?3.4.34 Current treatment of individuals with traumatic spinal cord injury: Do we need age-specific guidelines?3.4.35 Current surgical practice for traumatic spinal cord injury in Canada.3.4.36 The importance of “time to surgery” for traumatic spinal cord injured patients: results from an ambispective Canadian cohort of 949 patients.3.5.37 Assessment of a novel coil-shaped radiofrequency probe in the porcine spine.3.5.38 The effect of norepinephrine and dopamine on cerebrospinal fluid pressure after acute spinal cord injury.3.5.39 The learning curve of pedicle screw placement: How many screws are enough?4.1.40 Preliminary report from the Ontario Inter-professional Spine Assessment and Education Clinics (ISAEC).4.1.41 A surrogate model of the spinal cord complex for simulating bony impingement.4.1.42 Clinical and surgical predictors of specific complications following surgery for the treatment of degenerative cervical myelopathy: results from the multicentre, prospective AOSpine international study on 479 patients.4.2.43 Outcomes of surgical management of cervical spondylotic myelopathy: results of the prospective, multicentre, AOSpine international study in 479 patients.4.2.44 A clinical prediction rule for clinical outcomes in patients undergoing surgery for degenerative cervical myelopathy: analysis of an international AOSpine prospective multicentre data set of 757 subjects.4.2.45 The prevalence and impact of low back and leg pain among aging Canadians: a cross-sectional survey.4.3.46 Adjacent segment pathology: Progressive disease course or a product of iatrogenic fusion?4.3.47 Natural history of degenerative lumbar spondylolisthesis in patients with spinal stenosis.4.3.48 Changes in self-reported clinical status and health care utilization during wait time for surgical spine consultation: a prospective observational study.4.3.49 The Canadian surgical wait list for lumbar degenerative spinal stenosis has a detrimental effect on patient outcomes.4.3.50 Segmental lordosis is independent of interbody cage position in XLIF.4.3.51 Elevated patient BMI does not negatively affect self-reported outcomes of thoracolumbar surgery.1.5.52 The Spinal Stenosis Pedometer and Nutrition Lifestyle Intervention (SSPANLI): development and pilot.1.5.53 Study evaluating the variability of surgical strategy planning for patients with adult spinal deformity.1.5.54 Atlantoaxial instability in acute odontoid fractures is associated with nonunion and mortality.1.5.55 Peripheral hypersensitivity to subthreshold stimuli persists after resolution of acute experimental disc-herniation neuropathy.1.5.56 Radiation induced lumbar spinal osteonecrosis: case report and literature review.1.5.57 Comparative outcomes and cost-utility following surgical treatment of focal lumbar spinal stenosis compared with osteoarthritis of the hip or knee: Part 2 — estimated lifetime incremental cost-utility ratios.1.5.58 A predictive model of progression for adolescent idiopathic scoliosis based on 3D spine parameters at first visit.1.5.59 Development of a clinical prediction model for surgical decision making in patients with degenerative lumbar spine disease.2.5.60 Canadian spine surgery fellowship education: evaluating opportunity in developing a nationally based training curriculum.2.5.61 Pedicle subtraction osteotomy for severe proximal thoracic junctional kyphosis.2.5.62 A comparison of spine surgery referrals triaged through a multidisciplinary care pathway versus conventional referrals.2.5.63 Results and complications of posterior-based 3 column osteotomies in patients with previously fused spinal deformities.2.5.64 Orthopaedic Surgical AdVerse Event Severity (Ortho-SAVES) system: identifying opportunities for improved patient safety and resource utilization.2.5.65 Spontaneous spinal extra-axial haematomas — surgical experience in Otago and Southland 2011–2013.2.5.66 Obesity and spinal epidural lipomatosis in cauda equina syndrome.2.5.67 Factors affecting restoration of lumbar lordosis in adult degenerative scoliosis patients treated with lateral trans-psoas interbody fusion.3.6.68 Systematic review of complications in spinal surgery: a comparison of retrospective and prospective study design.3.6.69 Postsurgical rehabilitation patients have similar fear avoidance behaviour levels as those in nonoperative care.3.6.70 Outcomes of surgical treatment of adolescent spondyloptosis: a case series.3.6.71 Surgical success in primary versus revision thoracolumbar spine surgery.3.6.72 The effect of smoking on subjective patient outcomes in thoracolumbar surgery.3.6.73 Modelling patient recovery to predict outcomes following elective thoracolumbar surgery for degenerative pathologies.3.6.74 Outcomes from trans-psoas versus open approaches in the treatment of adult degenerative scoliosis.3.6.75 Lumbar spinal stenosis and presurgical assessment: the impact of walking induced strain on a performance-based outcome measure. Can J Surg 2014. [DOI: 10.1503/cjs.005614] [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: 11/01/2022] Open
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Cragg J, Noonan V, Dvorak M, Krassioukov A, Borisoff J. Cardiovascular and metabolic complications of spinal cord injury: Findings from a national population health study. J Neurol Sci 2013. [DOI: 10.1016/j.jns.2013.07.2131] [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: 10/26/2022]
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Allsop T, Neal R, Dvorak M, Kalli K, Rozhin A, Webb DJ. Physical characteristics of localized surface plasmons resulting from nano-scale structured multi-layer thin films deposited on D-shaped optical fiber. Opt Express 2013; 21:18765-18776. [PMID: 23938792 DOI: 10.1364/oe.21.018765] [Citation(s) in RCA: 3] [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: 06/02/2023]
Abstract
Novel surface plasmonic optical fiber sensors have been fabricated using multiple coatings deposited on a lapped section of a single mode fiber. UV laser irradiation processing with a phase mask produces a nano-scaled surface relief grating structure resembling nano-wires. The resulting individual corrugations produced by material compaction are approximately 20 μm long with an average width at half maximum of 100 nm and generate localized surface plasmons. Experimental data are presented that show changes in the spectral characteristics after UV processing, coupled with an overall increase in the sensitivity of the devices to surrounding refractive index. Evidence is presented that there is an optimum UV dosage (48 joules) over which no significant additional optical change is observed. The devices are characterized with regards to change in refractive index, where significantly high spectral sensitivities in the aqueous index regime are found, ranging up to 4000 nm/RIU for wavelength and 800 dB/RIU for intensity.
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Affiliation(s)
- T Allsop
- Aston Institute of Photonic Technologies, Aston University, Aston Triangle, Birmingham, B47ET, UK.
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Barrable B, Carpenter S, Noonan V, Thorogood N, Belanger L, Dvorak M. 043 Development and Implementation of National Standards For Spinal Cord Injury: A Partnership Between Accreditation Canada and the Rick Hansen Institute. BMJ Qual Saf 2013. [DOI: 10.1136/bmjqs-2013-002293.74] [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: 11/03/2022]
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Barrable B, Thorogood N, Noonan V, Joshi P, Stephenson K, Kwon B, Dvorak M. P260 A Model For Bridging The Translational Valley Of Death In Spinal Cord Injury. BMJ Qual Saf 2013. [DOI: 10.1136/bmjqs-2013-002293.227] [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: 11/03/2022]
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Shamji M, Moon ES, Glennie R, Soroceanu A, Lin C, Bailey C, Simmonds A, Fehlings M, Dodwell E, Dold A, El-Hawary R, Hashem M, Dold A, Dold A, Jones S, Bailey C, Karadimas S, Whitehurst D, Norton J, Norton J, Manson N, Kesani A, Bednar D, Lundine K, Hartig D, Fichadi A, Fehlings M, Kim S, Harris S, Lin C, Gill J, Abraham E, Shamji M, Choi S, Goldstein C, Wang Z, McCabe M, Noonan V, Nadeau M, Ferrara S, Kelly A, Melnyk A, Arora D, Quateen A, Dea N, Ranganathan A, Zhang Y, Casha S, Rajamanickam K, Santos A, Santos A, Wilson J, Wilson J, Street J, Wilson J, Lewis R, Noonan V, Street J, El-Hawary R, Egge N, Lin C, Schouten R, Lin C, Kim A, Kwon B, Huang E, Hwang P, Allen K, Jing L, Mata B, Gabr M, Richardson W, Setton L, Karadimas S, Fehlings M, Fleming J, Bailey C, Gurr K, Bailey S, Siddiqi F, Lawendy A, Sanders D, Staudt M, Canacari E, Brown E, Robinson A, McGuire K, Chrysostoum C, Rampersaud YR, Dvorak M, Thomas K, Boyd M, Gurr K, Bailey S, Nadeau M, Fisher C, Batke J, Street J, Boyd M, Dvorak M, Fisher C, Kwon B, Paquette S, Vaccaro A, Chapman J, Arnold P, Shaffrey C, Kopjar B, Snyder B, Wright J, Lewis S, Zeller R, El-Hawary R, Moroz P, Bacon S, Jarzem P, Hedden D, Howard J, Sturm P, Cahill P, Samdani A, Vitale M, Gabos P, Bodin N, d’Amato C, Harris C, Smith J, Parent E, Hill D, Hedden D, Moreau M, Mahood J, Lewis S, Bodrogi A, Abbas H, Goldstein S, Bronstein Y, Bacon S, Chua S, Magana S, Van Houwelingen A, Halpern E, Jhaveri S, Lewis S, Lim A, Leelapattana P, Fleming J, Siddiqqi F, Bailey S, Gurr K, Moon ES, Satkunendrarajah K, Fehlings M, Noonan V, Dvorak M, Bryan S, Aronyk K, Fox R, Nataraj A, Pugh J, Elliott R, McKeon M, Abraham E, Fleming J, Gurr K, Bailey S, Siddiqi F, Bailey C, Davis G, Rogers M, Staples M, Quan G, Batke J, Boyd M, Dvorak M, Fisher C, Kwon B, Paquette S, Street J, Shamji M, Hurlbert R, Jacobs W, Duplessis S, Casha S, Jha N, Hewson S, Massicotte E, Kopjar B, Mortaz S, Coyte P, Rampersaud Y, Rampersaud Y, Goldstein S, Andrew B, Modi H, Magana S, Lewis S, Roffey D, Miles I, Wai E, Manson N, Eastwood D, Elliot R, McKeon M, Bains I, Yong E, Sutherland G, Hurlbert R, Rampersaud Y, Chan V, Persaud O, Koshkin A, Brull R, Hassan N, Petis S, Kowalczuk M, Petrisor B, Drew B, Bhandari M, DiPaola C, Boyd M, Dvorak M, Fisher C, Kwon B, Paquette S, Street J, McLachlin S, Bailey S, Gurr K, Bailey C, Dunning C, Fehlings M, Vaccaro A, Wing P, Itshayek E, Biering-Sorensen F, Dvorak M, McLachlin S, Bailey S, Gurr K, Dunning C, Bailey C, Bradi A, Pokrupa R, Batke J, Boyd M, Dvorak M, Fisher C, Kwon B, Paquette S, Street J, Kelly A, Wen T, Kingwell S, Chak J, Singh V, Cripton P, Fisher C, Dvorak M, Oxland T, Wali Z, Yen D, Alfllouse A, Alzahrani A, Jiang H, Mahood J, Kortbeek F, Fox R, Nataraj A, Street J, Boyd M, Paquette S, Kwon B, Batke J, Dvorak M, Fisher C, Reddy R, Rampersaud R, Hurlbert J, Yong W, Casha S, Zygun D, McGowan D, Bains I, Yong V, Hurlbert R, Mendis B, Chakraborty S, Nguyen T, Tsai E, Chen A, Atkins D, Noonan V, Drew B, Tsui D, Townson A, Dvorak M, Chen A, Atkins D, Noonan V, Drew B, Dvorak M, Craven C, Ford M, Ahn H, Drew B, Fehlings M, Kiss A, Vaccaro A, Harrop J, Grossman R, Frankowski R, Guest J, Dvorak M, Aarabi B, Fehlings M, Noonan V, Cheung A, Sun B, Dvorak M, Vaccaro A, Harrop J, Massicotte E, Dvorak M, Fisher C, Rampersaud R, Lewis S, Fehlings M, Marais L, Noonan V, Queyranne M, Fehlings M, Dvorak M, Atkins D, Hurlbert R, Fox R, Fourney D, Johnson M, Fehlings M, Ahn H, Ford M, Yee A, Finkelstein J, Tsai E, Bailey C, Drew B, Paquet J, Parent S, Christie S, Dvorak M, Noonan V, Cheung A, Sun B, Dvorak M, Sturm P, Cahill P, Samdani A, Vitale M, Gabos P, Bodin N, d’Amato C, Harris C, Smith J, Lange J, DiPaola C, Lapinsky A, Connolly P, Eck J, Rabin D, Zeller R, Lewis S, Lee R, Boyd M, Dvorak M, Fisher C, Kwon B, Paquette S, DiPaola C, Street J, Bodrogi A, Goldstein S, Sofia M, Lewis S, Shin J, Tung K, Ahn H, Lee R, Batke J, Ghag R, Noonan V, Dvorak M, Goyal T, Littlewood J, Bains I, Cho R, Thomas K, Swamy G. Canadian Spine Society abstracts1.1.01 Supraspinal modulation of gait abnormalities associated with noncompressive radiculopathy may be mediated by altered neurotransmitter sensitivity1.1.02 Neuroprotective effects of the sodium-glutamate blocker riluzole in the setting of experimental chronic spondylotic myelopathy1.1.03 The effect of timing to decompression in cauda equina syndrome using a rat model1.2.04 Intraoperative waste in spine surgery: incidence, cost and effectiveness of an educational program1.2.05 Looking beyond the clinical box: the health services impact of surgical adverse events1.2.06 Brace versus no brace for the treatment of thoracolumbar burst fractures without neurologic injury: a multicentre prospective randomized controlled trial1.2.07 Adverse event rates in surgically treated spine injuries without neurologic deficit1.2.08 Functional and quality of life outcomes in geriatric patients with type II odontoid fracture: 1-year results from the AOSpine North America Multi-Center Prospective GOF Study1.3.09 National US practices in pediatric spinal fusion: in-hospital complications, length of stay, mortality, costs and BMP utilization1.3.10 Current trends in the surgical treatment of adolescent idiopathic scoliosis in Canada1.3.11 Sagittal spinopelvic parameters help predict the risk of proximal junctional kyphosis for children treated with posterior distraction-based implants1.4.12 Correlations between changes in surface topography and changes in radiograph measurements from before to 6 months after surgery in adolescents with idiopathic scoliosis1.4.13 High upper instrumented vertebra (UIV) sagittal angle is associated with UIV fracture in adult deformity corrections1.4.14 Correction of adult idiopathic scoliosis using intraoperative skeletal traction1.5.01 Cauda equina: using management protocols to reduce delays in diagnosis1.5.02 Predicting the need for tracheostomy in patients with acute traumatic spinal cord injury1.5.03 A novel animal model of cervical spondylotic myelopathy: an opportunity to identify new therapeutic targets1.5.04 A review of preference-based measures of health-related quality of life in spinal cord injury research1.5.05 Predicting postoperative neuropathic pain following surgery involving nerve root manipulation based on intraoperative electromyographic activity1.5.06 Detecting positional injuries in prone spinal surgery1.5.07 Percutaneous thoracolumbar stabilization for trauma: surgical morbidity, clinical outcomes and revision surgery1.5.08 Systemic inflammatory response syndrome in spinal cord injury patients: Does its presence at admission affect patient outcomes?2.1.15 One hundred years of spine surgery — a review of the evolution of our craft and practice in the spine surgical century [presentation]2.1.16 Prevalence of preoperative MRI findings of adjacent segment disc degeneration in patients undergoing anterior cervical discectomy and fusion2.1.17 Adverse event rates of surgically treated cervical spondylopathic myelopathy2.1.18 Morphometricand dynamic changes in the cervical spine following anterior cervical discectomy and fusion and cervical disc arthroplasty2.1.19 Is surgery for cervical spondylotic myelopathy cost-effective? A cost–utility analysis based on data from the AO Spine North American Prospective Multicentre CSM Study2.2.20 Cost–utility of lumbar decompression with or without fusion for patients with symptomatic degenerative lumbar spondylolisthesis (DLS)2.2.21 Minimally invasive surgery lumbar fusion for low-grade isthmic and degenerative spondylolisthesis: 2- to 5-year follow-up2.2.22 Results and complications of posterior-only reduction and fusion for high-grade spondylolisthesis2.3.23 Fusion versus no fusion in patients with central lumbar spinal stenosis and foraminal stenosis undergoing decompression surgery: comparison of outcomes at baseline and follow-up2.3.24 Two-year results of interspinous spacers (DIAM) as an alternative to arthrodesis for lumbar degenerative disorders2.3.25 Treatment of herniated lumbar disc by sequestrectomy or conventional discectomy2.4.26 No sustained benefit of continuous epidural analgesia for minimally invasive lumbar fusion: a randomized double-blinded placebo controlled study2.4.27 Evidence and current practice in the radiologic assessment of lumbar spine fusion2.4.28 Wiltse versus midline approach for decompression and fusion of the lumbar spine2.5.09 The effect of soft tissue restraints following type II odontoid fractures in the elderly — a biomechanical study2.5.10 Development of an international spinal cord injury (SCI) spinal column injury basic data set2.5.11 Evaluation of instrumentation techniques for a unilateral facet perch and fracture using a validated soft tissue injury model2.5.12 Decreasing neurologic consequences in patients with spinal infection: the testing of a novel diagnostic guideline2.5.13 Prospective analysis of adverse events in surgical treatment of degenerative spondylolisthesis2.5.14 Load transfer characteristics between posterior fusion devices and the lumbar spine under anterior shear loading: an in vitro investigation2.5.15 Preoperative predictive clinical and radiographic factors influencing functional outcome after lumbar discectomy2.5.16 A Thoracolumbar Injury Classification and Severity Score (TLICS) of 4: What should we really do?3.1.29 Adverse events in emergent oncologic spine surgery: a prospective analysis3.1.30 En-bloc resection of primary spinal and paraspinal tumours with critical vascular involvement3.1.31 The treatment impact of minocycline on quantitative MRI in acute spinal cord injury3.1.32 Benefit of minocycline in spinal cord injury — results of a double-blind randomized placebo-controlled study3.2.33 Improvement of magnetic resonance imaging correlation with unilateral motor or sensory deficits using diffusion tensor imaging3.2.34 Comparing care delivery for acute traumatic spinal cord injury in 2 Canadian centres: How do the processes of care differ?3.2.35 Improving access to early surgery: a comparison of 2 centres3.3.36 The effects of early surgical decompression on motor recovery after traumatic spinal cord injury: results of a Canadian multicentre study3.3.37 A clinical prediction model for long-term functional outcome after traumatic spinal cord injury based on acute clinical and imaging factors3.3.38 Effect of motor score on adverse events and quality of life in patients with traumatic spinal cord injury3.4.39 The impact of facet dislocation on neurologic recovery after cervical spinal cord injury: an analysis of data on 325 patients from the Surgical Trial in Acute Spinal Cord Injury Study (STASCIS)3.4.40 Toward a more precise understanding of the epidemiology of traumatic spinal cord injury in Canada3.4.41 Access to care (ACT) for traumatic SCI: a survey of acute Canadian spine centres3.4.42 Use of the Spine Adverse Events Severity (SAVES) instrument for traumatic spinal cord injury3.5.17 Does the type of distraction-based growing system for early onset scoliosis affect postoperative sagittal alignment?3.5.18 Comparison of radiation exposure during thoracolumbar fusion using fluoroscopic guidance versus anatomic placement of pedicle screws3.5.19 Skeletal traction for intraoperative reduction in adolescent idiopathic scoliosis3.5.20 Utility of intraoperative cone-beam computed tomography (O-ARM) and stereotactic navigation in acute spinal trauma surgery3.5.21 Use of a central compression rod to reduce thoracic level spinal osteotomies3.5.22 ICD-10 coding accuracy for spinal cord injured patients3.5.23 Feasibility of patient recruitment in acute SCI trials3.5.24 Treatment of adult degenerative scoliosis with DLIF approaches. Can J Surg 2012. [DOI: 10.1503/cjs.012212] [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] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
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Motovska Z, Widimsky P, Brambaski I, Dvorak M, Julisova I, Kozak T. Haematological manifestation of coeliac disease in a young patient with myocardial infarction. Intern Med J 2010; 39:704-6. [PMID: 19849762 DOI: 10.1111/j.1445-5994.2009.01997.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Zahumensky J, Sottner O, Brtnicka H, Dvorak M, Krcmar M, Zmrhalova B, Driak D, Halaska M. Pregnancy and Delivery After Ectopic Pregnancy in a Caesarean Section Scar. Geburtshilfe Frauenheilkd 2008. [DOI: 10.1055/s-2008-1038529] [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: 10/22/2022] Open
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Karafiat V, Dvorakova M, Pajer P, Cermak V, Dvorak M. Melanocyte fate in neural crest is triggered by Myb proteins through activation of c-kit. Cell Mol Life Sci 2008; 64:2975-84. [PMID: 17952366 DOI: 10.1007/s00018-007-7330-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [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: 11/27/2022]
Abstract
The c-myb proto-oncogene and its oncogenic derivative v-mybAMV encode transcriptional regulators engaged in the commitment of hematopoietic cells. While the c-Myb protein is important for the formation and differentiation of various progenitors, the v-MybAMV oncoprotein induces in chicks a progression and transformation of the single (monoblastic) cell lineage. Here we present the first evidence of cell fate-directing abilities of c-Myb and v-MybAMV proteins in avian neural crest (NC), where both proteins determine melanocytogenesis. The increased concentration of c-Myb induces progression into dendritic melanocytes and differentiation. The v-myb oncogene converts essentially all NC cells into melanocytes and causes their transformation. Both Myb proteins activate in NC cells expression of the c-kit gene and stem cell factor c-Kit signaling--one of the essential pathways in melanocyte development. These observations suggest that the c-myb-c-kit pathway represents a common regulatory scheme for both hematopoietic and neural progenitors and establishes a novel experimental model for studies of melanocytogenesis and melanocyte transformation.
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Affiliation(s)
- V Karafiat
- Department of Molecular Virology, Institute of Molecular Genetics, AS CR v.v.i., Vídenská 1083, Prague 4, 14220, Czech Republic
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Leypold J, Privara M, Staffa R, Dvorak M, Novotny T. Hepatocellular carcinoma--evaluation of a group of 74 patients treated at the surgical department. BRATISL MED J 2008; 109:14-16. [PMID: 18447255] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The authors present their experience with treatment of 74 patients operated on for hepatocellular carcinoma. Resection could be performed only in 44 patients. In 19 cases, a catheter for regional chemotherapy was implanted. Tumor destruction with alcohol was performed 4 times and radiofrequency thermal ablation 5 times either as a single intervention or in addition to the resection. Liver cirrhosis was verified by histology in 29 operated patients. Hospital mortality: 2 operated patients. Median survival after the liver resection: 42 months, mean survival: 72 months. The importance of preoperative indocyanine green elimination test for the exact determination of functional capacity of the liver and the priority of radical resection as compared to the other treatment modalities are emphasized (Tab. 2, Ref. 12). Full Text (Free, PDF) www.bmj.sk.
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Affiliation(s)
- J Leypold
- 2nd Department of Surgery, Masaryk University, St. Anne's University Hospital Brno, Czech Republic.
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Kralova J, Dvorak M, Koc M, Kral V. p38 MAPK plays an essential role in apoptosis induced by photoactivation of a novel ethylene glycol porphyrin derivative. Oncogene 2007; 27:3010-20. [DOI: 10.1038/sj.onc.1210960] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Mudrich M, Forkl B, Müller S, Dvorak M, Bünermann O, Stienkemeier F. Kilohertz laser ablation for doping helium nanodroplets. Rev Sci Instrum 2007; 78:103106. [PMID: 17979405 DOI: 10.1063/1.2796849] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
A new setup for doping helium nanodroplets by means of laser ablation at kilohertz repetition rate is presented. The doping process is characterized and two distinct regimes of laser ablation are identified. The setup is shown to be efficient and stable enough to be used for spectroscopy, as demonstrated on beam depletion spectra of lithium atoms attached to helium nanodroplets. For the first time, helium droplets are doped with high temperature refractory materials such as titanium and tantalum. Doping with the nonvolatile DNA basis guanine is found to be efficient and a number of oligomers are detected.
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Affiliation(s)
- M Mudrich
- Physikalisches Institut, Universität Freiburg, D-79104 Freiburg, Germany.
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Karafiat V, Dvorakova M, Krejci E, Kralova J, Pajer P, Snajdr P, Mandikova S, Bartunek P, Grim M, Dvorak M. Transcription factor c-Myb is involved in the regulation of the epithelial-mesenchymal transition in the avian neural crest. Cell Mol Life Sci 2006; 62:2516-25. [PMID: 16231084 DOI: 10.1007/s00018-005-5297-7] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [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: 10/25/2022]
Abstract
Multipotential neural crest cells (NCCs) originate by an epithelial-mesenchymal transition (EMT) during vertebrate embryogenesis. We show for the first time that the key hematopoietic factor c-Myb is synthesized in early chick embryos including the neural tissue and participates in the regulation of the trunk NCCs. A reduction of endogenous c-Myb protein both in tissue explants in vitro and in embryos in ovo, prevented the formation of migratory NCCs. A moderate over-expression of c-myb in naive intermediate neural plates triggered the EMT and NCC migration probably through cooperation with BMP4 signaling because (i) BMP4 activated c-myb expression, (ii) elevated c-Myb caused accumulation of transcripts of the BMP4 target genes msx1 and slug, and (iii) the reduction of c-Myb prevented the BMP4-induced formation of NCCs. The data show that in chicken embryos, the c-myb gene is expressed prior to the onset of hematopoiesis and participates in the formation and migration of the trunk neural crest.
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Affiliation(s)
- V Karafiat
- Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, 166 37 Prague, Czech Republic
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Podlaha J, Holub R, Konecny Z, Leypold J, Dvorak M, Piskac P. 20-year experience with operations for popliteal artery aneurysm. BRATISL MED J 2005; 106:421-2. [PMID: 16642669] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
At the 2nd Department of Surgery, St. Anne's University hospital Brno, a total of 76 operations for popliteal artery aneurysm were performed in 67 patients in the last 20 years, in period 1985-2004. 63 operations were elective and 13 urgent. For reconstruction, autologous saphenous vein was used in 53 cases, vascular prosthesis in 15 cases, and a cryopreserved vein allograft in 3 cases. In 5 cases, amputation for advanced lower limb ischaemia was performed without arterial reconstruction. Elective operation is indicated in all patients with popliteal artery aneurysm, and it is associated with a relatively low risk for the patient. In fact, it is a preventive operation. In the acute stage, there is a higher risk of complications and (potential) amputation (Fig. 1, Ref. 8).
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Affiliation(s)
- J Podlaha
- 2nd Department of Surgery, Masaryk University Brno, St. Anne's University Hospital, Brno, Czech Republic.
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Podlaha J, Leypold J, Dvorak M, Staffa R, Piskac P, Kriz Z. 20-year experience in operations for subclavian steal syndrome. BRATISL MED J 2004; 105:384-7. [PMID: 15658581] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/01/2023]
Abstract
The aim of this article is to summarize our experience in operations for subclavian steal syndrome. We recommend anaesthesia with preservation of patient's consciousness and mobility, and we prefer transposition of arteries to prosthesis implantation. The main characteristic of this approaches is an attempt to increase safety of operation. A feasible procedure is suggested also in the case of reconstruction occlusion: the axillo-axillary bypass. (Fig. 6, Ref. 3.)
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Affiliation(s)
- J Podlaha
- 2nd Department of Surgery, Masaryk University Brno, St. Anne's University Hospital, Brno, Czech Republic.
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Piskac P, Leypold J, Hnizdil L, Dvorak M, Piskacova I. Patient with percutaneous endoscopic gastrostomy. BRATISL MED J 2003; 104:51-3. [PMID: 12839211] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/03/2023]
Abstract
INTRODUCTION Since 1980, when percutaneous endoscopic gastrostomy was described and performed for the first time, the number of patients with this way of nutrition has been growing. At present, however, these patients are treated not only in intensive care units, but also in follow-up care institutions or in home care. AIM We want to explain the problems of nutrition via endoscopic gastrostomy to those physicians who take long-term care of these patients. METHODS In our department we introduced percutaneous endoscopic gastrostomy in 1994. A total of 78 PEGs were performed. In all cases the pull technique was used. A condition for percutaneous endoscopic gastrostomy insertion was an unaffected gastrointestinal tract from the stomach in aboral direction. The most frequent indications were: necessity of long-term enteral nutrition in patients during artificial ventilation, neurological patients with lost swallowing reflex, and patients with a tumor in the ENT area with preserved patency for the endoscope. RESULTS In all cases, the intervention itself was without major complications and no death occurred relating to the intervention. Subsequently, mainly local complications such as decubitus ulcers or maceration around the tube and its accidental removal by a restless patient were noticed. CONCLUSION In cases of more than 6-week inability to ingest food per os with otherwise unaffected gastrointestinal tract, it is appropriate to consider the nutrition via PEG. Using this method, it is possible to ensure an adequate access for enteral nutrition for a longer time without risk of complications associated with the nasoenteric tube, with minimum trouble to the patient. (Fig. 1, Ref. 9.).
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Affiliation(s)
- P Piskac
- 2nd Department of Surgery, Masaryk University, Brno, Czech Republic.
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Abstract
OBJECTIVE AND DESIGN In the present study we examined the effects of the cannabinoid receptor agonist HU210 on histamine-evoked somatosensory and vascular responses in humans. SUBJECTS Two sets of experiments were performed, in which twelve (Study 1, iontophoresis) and six participants (Study 2, microdialysis) were recruited. TREATMENT HU210 was administered peripherally by skin patch (50 mM) or dermal microdialysis (5 mM), whereas histamine was applied by iontophoresis (50 microAmps) or dermal microdialysis (5 microM). METHODS Skin blood flow was monitored by laser Doppler, widespread flare reaction was evaluated planimetrically, extravasation of plasma proteins was measured in the dialysate and perceived itch was recorded using a visual analogue scale. Data were evaluated by analysis of variance. RESULTS Experimentally induced itch was significantly reduced by peripheral administration of HU210 (p < 0.05). Additionally, skin blood flow and neurogenic mediated flare responses were attenuated (p < 0.003 and p < 0.03, respectively), whereas protein extravasation due to histamine was enhanced by co-administration of HU210, as investigated by dermal microdialysis. CONCLUSIONS In humans peripheral administration of a cannabinoid receptor agonist attenuates histamine-induced itch. The observation that protein extravasation was not decreased demonstrates that the alleviation of itch is not due to an anti-histaminergic property of HU210. The reduced neurogenic flare reaction indicates an attenuated antidromic nerve fibre activation and neuropeptide release.
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Affiliation(s)
- M Dvorak
- Unilever Research & Development Port Sunlight, Wirral, UK
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Jerabek J, Dvorak M, Vojtisek B. Results of therapy of lower extremity ischemic disease by angiosurgery and radiointervention (PTA) methods. BRATISL MED J 2003; 104:314-6. [PMID: 15055731] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
The aim of our work is to evaluate the results of therapy of lower extremity ischemic disease (LEID) in patients treated at 2nd Department of Surgery, St. Anne's Teaching Hospital, Brno, in 2000. According to the therapeutic approach, the patients were divided into two groups: 1. reconstructive angiosurgeries (95 patients), 2. PTA (42 interventions in 36 patients). The short-term follow-up (18 months) has given the following results: in the group of surgical interventions--the patency was 87.37%, in the PTA group it was 83.33%. There was a marked difference between the patency of PTA reconstructions in the region of pelvic arteries (100%) and that in the femoropopliteal region (58.83%). We have found out that in the solution of LEID, angiosurgeries and radiointerventions are equivalent methods and that they complement each other. (Tab. 2, Fig. 3, Ref. 10.).
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Affiliation(s)
- J Jerabek
- 2nd Department of Surgery, St. Anne's Teaching Hospital Brno, Czech Republic.
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Fisher CG, Sun JC, Dvorak M. Recognition and management of atlanto-occipital dislocation: improving survival from an often fatal condition. Can J Surg 2001; 44:412-20. [PMID: 11764873 PMCID: PMC3692674] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023] Open
Abstract
OBJECTIVE To provide an overview of atlanto-occipital dislocation and associated occipital condyle fracturcs so as to alert physicians to this rare injury and potentially improve patient outcome. The pertinent anatomy, mechanism of injury, clinical and radiologic evaluation and the management of these rare injuries are discussed in an attempt to alert physicians to this type of injury and to improve outcome. DATA SOURCES The data were obtained from a MEDLINE search of the English literature from 1966 to 1999 and the experience of 4 spine surgeons at a quaternary care acute spinal cord injury unit. STUDY SELECTION Detailed anatomic and epidemiologically sound radiology studies were identified and analyzed. Only small retrospective studies or case series were available in the literature. DATA EXTRACTION Valid anatomic, biomechanical and radiologic evaluation was extracted from studies. Clinical data came from limited studies and expert opinion. DATA SYNTHESIS Early diagnosis is essential and is facilitated by a detailed clinical examination and strict adherence to an imaging algorithm that includes CT and MRI scanning. When the dislocation is identified, timely gentle reduction and prompt stabilization throuigh nonoperative or operative means is found to optimize patient outcome. CONCLUSIONS Atlanto-occipital dislocation should be suspected in any patient involved in a high speed motor vehicle or pedestrian collision. Once suspected, proper imaging and appropriate management of these once fatal injuries can improve survival and neurologic outcome.
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Affiliation(s)
- C G Fisher
- Department of Orthopedics, Vancouver General Hospital and the University of British Columbia.
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Leypold J, Kriz Z, Privara M, Horvath V, Dvorak M. [Assessment of functional capability of liver parenchyma using indocyanine green before liver resection]. BRATISL MED J 2001; 102:115-6. [PMID: 11396123] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Abstract
During the period from 1997 to 2000, the total of 129 liver operations were performed at the 2nd Surgical Department of the Masaryk's University in Brno. Malignant tumours were present in 91 cases. In-hospital mortality in patients operated on for malignant liver tumours was 2.1%. No case of death was caused by liver insufficiency. Examination of liver function by use of indocyanine green (ICG) enabling the determination of the extent of possible resection, contributes to the lowering of postoperative morbidity and mortality. The rate of indocyanine green retention up to 6% does not limit the extent of resection, the retention rate up to 15% allows bisegmentectomy or a minor surgery, the retention rate up to 20% allows segmentectomy at the most, and the retention rate up to 30% enables superficial excisions only.
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Affiliation(s)
- J Leypold
- II. chirurgická klinika LFMU, FN u sv. Anny, Pekarská 53, CZ-656 91 Brno.
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Affiliation(s)
- H A Underwood
- Vancouver General Hospital, University of British Columbia, Canada
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36
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Abstract
The v-myb(AMV) oncogene transforms myelomonocytic cells in vitro and induces acute monoblastic leukemia in chickens. We analyzed the activity of the evolutionarily conserved PEST-like domain (P1 domain) for biochemical and biological activities of v-Myb in ex vivo cultures and in vivo. Deletion of the P1 domain did not affect v-Myb transcriptional activity, intracellular stability, or subcellular localization. However, it resulted in subtle yet important changes in biological activities. Although the mutant DeltaP1 v-Myb protein blocked the terminal differentiation of the monocyte/macrophage lineage as efficiently as the wild type (wt) in ex vivo cultures, it failed to induce the acute phase of monoblastic leukemia, with its fatal consequences, in vivo. Interestingly, in DeltaP1 v-myb-infected animals large numbers of monoblasts, comparable to those induced by wt v-myb, were present in the bone marrow but very few were found in the peripheral blood. The comparison of ex vivo wt- and DeltaP v-Myb bone marrow cells revealed several important features of v-Myb transformation: (i) the proliferation of transformed monoblasts is not an apparent consequence of the differentiation block with these processes being at least in part independent; (ii) the P1 domain is required for proliferation of v-Myb-mediated transformed monoblasts; (iii) the mechanism which renders transformed cells growth factor independent does not involve activation of an autocrine growth factor loop; and (iv) deletion of the P1 domain affects self-adhesion properties of v-myb-transformed monoblasts as well as their interaction with bone marrow stromal cells. These data indicate that the DeltaP1 v-myb mutant and ex vivo bone marrow cell cultures represent a valuable tool for studies on the mechanisms of leukemia formation.
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Affiliation(s)
- M Dvorakova
- Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Flemingovon. 2, Prague 6, 166 37, Czech Republic
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Podlaha J, Gregor Z, Roubal P, Horky B, Dvorak M. Ruptured abdominal aortic aneurysm--outcomes in the last ten years. BRATISL MED J 2000; 101:191-3. [PMID: 10914462] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
Ruptured abdominal aortic aneurysm (AAA) remains to be represent a common and highly lethal problem. We reviewed the records of 92 patients (73 men and 19 women) operated on for ruptured infrarenal AAA within the past 10 years (January 1989 to October 1999) in the 2nd Department of Surgery in Brno, Czech Republic. The mean age was 71 years (range 57 to 92 years). Only 10 patients (10.9%) were known to have an AAA before the rupture. Preoperative systolic blood pressure below 90 mmHg was present in 70 patients (76%) and 15 patients (16.3%) experienced cardiac arrest before surgery. The in-hospital mortality rate was 47.8% (44 patients). Among the total of 92 patients, haemoperitoneum was discovered only in 30 patients (32.6%) with the mortality rate of 40% (12 patients). In 62 patients (67.4%) also hemoperitoneum was present, the mortality rate was 51.6% (32 patients) in these patients. Multiorgan failure due to an irreversible hemorrhagic shock was the main cause of death in 23 patients (25%). Further causes were: heart failure--8 patients (8.7%), pulmonary complications--5 patients (5.4%), renal failure--4 patients (4.3%), bleeding--3 patients (3.3%), and sepsis--1 patient (1.1%). The patient's prognosis depends on early diagnostics and on the quality of peroperative and postoperative care. (Tab. 2, Ref. 8.)
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Affiliation(s)
- J Podlaha
- 2nd Department of Surgery in Brno, School of Medicine, Masaryk University Brno, Czech Republic.
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Virgolini I, Kurtaran A, Leimer M, Kaserer K, Peck-Radosavljevic M, Angelberger P, Hübsch P, Dvorak M, Valent P, Niederle B. Location of a VIPoma by iodine-123-vasoactive intestinal peptide scintigraphy. J Nucl Med 1998; 39:1575-9. [PMID: 9744346] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
A major problem in patients with small endocrine tumors is the difficulty in localizing the primary tumor site. Many endocrine tumors possess larger amounts of high affinity vasoactive intestinal peptide (VIP) binding sites compared with normal tissue or blood cells. We used radiolabeled VIP to localize the tumor site in a patient with Verner-Morrison syndrome (VMS). Under octreotide therapy, the VIP levels had declined in this patient, but a tumor site could not be detected by conventional techniques or by radiolabeled octreotide. However, using 123I-VIP, the tumor was detectable in the pancreatic tail. Surgical resection of the tumor was followed by complete remission of the VMS. Expression of VIP binding sites in the tumor was confirmed by a radioreceptor assay and showed cross-competition between VIP and octreotide. The identity of the VIP binding site in the tumor was analyzed by Northern blotting and revealed the expression of somatostatin receptor subtype 3, which binds both somatostatin-14 and VIP with higher affinity than octreotide. Iodine-123-VIP scintigraphy would be an effective tracer to identity the tumor site in VMS patients.
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Affiliation(s)
- I Virgolini
- Department of Nuclear Medicine, University of Vienna, Austria
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Roberts FJ, Walsh A, Wing P, Dvorak M, Schweigel J. The influence of surveillance methods on surgical wound infection rates in a tertiary care spinal surgery service. Spine (Phila Pa 1976) 1998; 23:366-70. [PMID: 9507627 DOI: 10.1097/00007632-199802010-00016] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.3] [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: 02/06/2023]
Abstract
STUDY DESIGN A 1-year prospective study of the influence of surveillance methods on the surgical wound infection rates in a tertiary care spinal surgery unit. OBJECTIVES To assess the effect of postdischarge surveillance, the diagnostic indications for surgery, and the type of procedure on the surgical wound infection rates. SUMMARY OF BACKGROUND DATA Use of the National Nosocomial Infection Surveillance system for surgical wound infection resulted in infection rates above the published values for procedures performed by the Spinal Surgical Service. A preliminary review failed to find causes for these higher rates, and a study was undertaken to assess the influence of the surveillance methods used. METHODS Patient information collected by the Spinal Surgical Service and surveillance data obtained by infection control were combined in a relational database. Surveillance after discharge was performed by regularly sending questionnaires to surgeons' offices. The diagnostic indications were assessed by dividing all patients into three groups: Class D (disc disease or spinal stenosis). Class T (spinal trauma within 60 days), and Class M (mostly complex spinal procedures for deformity and instability). Infection rates for the three diagnostic indication classes and for procedures with and without instrumentation were calculated. RESULTS Postdischarge surveillance significantly increased the infection rates, mostly by detecting superficial infections that did not require readmission. Significant differences were noted between Class T and Class M patients undergoing lumbar posterior segmental instrumentation, despite the fact that they had a similar incidence of risk factors according to the National Nosocomial Infection Surveillance system. The surgical wound infection rates of the National Nosocomial Infection Surveillance system may not be appropriate standards for specialized units with a high incidence of complex clinical problems and complicated surgical procedures. CONCLUSIONS Postdischarge surveillance, surgical procedure classification methods, and the indications for surgery (e.g., trauma, congenital deformity) influence the surgical wound infection rate. Current adjustments for some of these factors in the National Nosocomial Infection Surveillance system appear to be inadequate when used in a tertiary care facility.
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Affiliation(s)
- F J Roberts
- Division of Medical Microbiology, Vancouver Hospital and Health Sciences Centre, British Columbia, Canada
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40
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Qian M, Kralova J, Yu W, Bose HR, Dvorak M, Sanders BG, Kline K. c-Jun involvement in vitamin E succinate induced apoptosis of reticuloendotheliosis virus transformed avian lymphoid cells. Oncogene 1997; 15:223-30. [PMID: 9244357 DOI: 10.1038/sj.onc.1201181] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.7] [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: 02/04/2023]
Abstract
Previous studies have shown that treatment of avian reticuloendotheliosis virus-transformed RECC-UTC4-1 (C4-1) lymphoblastoid cells with 10 microg/ml (18.8 microM) of RRR-alpha-tocopheryl succinate (vitamin E succinate, VES) for 3 days induced approximately 50% of the cells to undergo apoptosis. Elevated and prolonged expression of c-jun mRNA and protein was temporally correlated with VES-induced cell death. Data presented in this paper show that the elevated and prolonged expression of c-jun message and protein are not accounted for by enhanced stability, and show the involvement of c-Jun in VES-induced apoptosis in this lymphoblastoid cell type. C4-1 cells infected with a virus carrying a dominant, negatively acting mutant form of c-Jun, supjun-1, exhibited: (i) 71% reduction in VES-induced apoptosis, (ii) a 2.0-2.5-fold decrease in wildtype, endogenous c-Jun expression, and (iii) a 2.4-2.6-fold reduction in AP-1 binding activity. Additionally, cells co-treated with VES plus RRR-alpha-tocopherol, exhibited a 70% reduction in apoptosis, a marked reduction in c-Jun expression and a 1.6-fold reduction in AP-1 binding activity. These studies suggest that c-Jun plays a crucial role in VES-induced apoptosis in C4-1 cells, and add to our understanding of mechanisms of action involved in VES-mediated tumor cell growth inhibition.
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Affiliation(s)
- M Qian
- Genetics Institute, Academy of Sciences of Czech Republic, Prague
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41
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Moxham JP, Kibblewhite DJ, Dvorak M, Perey B, Tencer AF, Bruce AG, Strong DM. TGF-beta 1 forms functionally normal bone in a segmental sheep tibial diaphyseal defect. J Otolaryngol 1996; 25:388-92. [PMID: 8972431] [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] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
OBJECTIVE Transforming growth factor-beta 1 (TGF-beta 1) is a polyfunctional regulatory cytokine that has been shown to have roles in extracellular matrix interactions, soft tissue healing, and osteogenesis. This study was undertaken to determine the efficacy of TGF-beta 1 in the formation of functionally normal bone in tibial-diaphyseal defects. METHOD Seven hundred fifty micrograms of recombinant human TGF-beta 1 was added to a guanidine-extracted demineralised bone matrix (Gu-DBM) carrier and the implants were used to fill a 2.5 cm tibial diaphyseal defect in skeletally mature female sheep. The defects were allowed to heal over a 12-week period. After sacrifice, they were analyzed using four-point bending mechanical testing. RESULTS Implants with TGF-beta 1 showed complete bony bridging of the defect and stress-strain curves similar to the normal contralateral limb, while implants with the carrier alone failed to bridge the gap. CONCLUSIONS These results demonstrate the ability of TGF-beta 1 to induce new bone which has structural and functional characteristics similar to normal bone.
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Affiliation(s)
- J P Moxham
- Division of Otolaryngology-Head and Neck Surgery, University of British Columbia, Vancouver Hospital and Health Sciences Centre
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42
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Hunter T, Forster B, Dvorak M. Ankylosed spines are prone to fracture. Can Fam Physician 1995; 41:1213-6. [PMID: 7647627 PMCID: PMC2146165] [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] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Fracture of an ankylosed spine is often overlooked. Because the force that damages an ankylosed spine is frequently slight, patients do not realize they are injured. Doctors can miss the fracture for the same reason and because patients already have a history of back pain. Plain radiographs sometimes fail to demonstrate the fracture site.
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Affiliation(s)
- T Hunter
- University of British Columbia (UBC), Vancouver
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43
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Dvorak M, MacDonald S, Gurr KR, Bailey SI, Haddad RG. An anatomic, radiographic, and biomechanical assessment of extrapedicular screw fixation in the thoracic spine. Spine (Phila Pa 1976) 1993; 18:1689-94. [PMID: 8235850 DOI: 10.1097/00007632-199309000-00018] [Citation(s) in RCA: 54] [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: 02/01/2023]
Abstract
This study performed a thorough review of the pertinent thoracic spine anatomy to determine the appropriate landmarks for extrapedicular screw placement and indentified the anatomic structures at risk; assessed the safety and accuracy of the newly proposed screw insertion technique; determined the stability and strength of this new screw position through biomechanical testing; and analyzed the stability of this extrapedicular screw location with respect to bone mineral density of the vertebra.
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Affiliation(s)
- M Dvorak
- University of British Columbia, Vancouver, Canada
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Abstract
The arthroscopic anatomy of the hip has been studied using a number of portals. Both distraction and positioning are necessary to allow insertion of instruments, and to allow exposure of the important anatomical structures. The internal anatomy of the hip joint is described in detail based on the arthroscopic view from the different portals. This study helps orient those interested in arthroscopy of the hip.
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Affiliation(s)
- M Dvorak
- Department of Orthopaedics, University of British Columbia, Vancouver, Canada
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Vlach J, Dvorak M, Bartunek P, Pecenka V, Travnicek M, Sponar J. Supercoil-induced Z-DNA formation within 5'-end of chicken myb proto-oncogene. Biochem Biophys Res Commun 1989; 158:737-42. [PMID: 2645867 DOI: 10.1016/0006-291x(89)92783-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [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: 01/01/2023]
Abstract
We have analyzed the recently sequenced and characterized 2.9 kb fragment derived from the 5'-end of chicken myb proto-oncogene with respect to structural perturbations induced by DNA supercoiling. Within the first intron a 50 bp sequence stretch was localized, starting approximately 450 nucleotides downstream from putative ATG initiation codon, which forms a non-B-DNA structure. Fine mapping with structural probes revealed the three adjacent regions with imperfect purine-pyrimidine alternation creating together relatively long Z-forming tract, parts of which may undergo a B-Z DNA transition at different superhelical densities.
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Affiliation(s)
- J Vlach
- Institute of Organic Chemistry and Biochemistry, Czechoslovak Academy of Sciences, Prague
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Hussain MN, Sirek A, Dvorak M, Cukerman E, Sirek OV. Growth hormone stimulates serotonin secretion into the hepatic portal circulation. Can J Physiol Pharmacol 1983; 61:95-7. [PMID: 6839209 DOI: 10.1139/y83-011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Hepatic portal plasma concentrations of free serotonin were found to be transiently but significantly elevated in normal dogs following a single injection of ovine growth hormone into a peripheral vein. The data are consistent with the concept that spike concentrations of growth hormone are capable of altering the splanchnic concentration of agents that are concerned with glucose homeostasis.
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47
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Toulová M, Herzig I, Dvorak M, Vojtísek B, Raszyk J. [Changes in biochemical indicators in the blood and organs of pigs fed dried grape press cake]. VET MED-CZECH 1979; 24:715-24. [PMID: 118574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
In two experiments the effect of feeding dried crushed white and red grape press cake replacing 10--20% of the complex feed mixture A1 and SOL, was studied on the 21 biochemical indicators of blood serum, plasma, suprarenal glands, liver and tissue of fattened pigs. Changes indicating unsuitability of this non-traditional feed were not observed. During feeding red grape press cake, the young pigs of 35kg body weight had a lower concentration of glucose in blood serum, in comparison with the control. The temporary increase of calcium level and decrease of inorganic phosphorus in these animals was accompanied by a lower activity of alkaline phosphatase. White and red grape press cake affected positively the vitamin E level in blood serum. In the muscles of the experimental slaughter pigs protein proportion was increased and fat proportion was decreased.
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Dvorak M, Fric P, Lojda Z. [Disorder of the small intestine in Duhring's herpetiform dermatitis]. Cesk Gastroenterol Vyz 1979; 33:403-10. [PMID: 509587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Abstract
The effects of immersion by 5-cm increments on the expiratory reserve volume of the lungs (ERV) and on the vital capacity were studied in the sitting and supine positions. These effects were compared to those produced by continuous negative-pressure breathing when the subjects were in air and were counteracted by positive pressure breathing during immersion. The depth of immersion was also related to definable anatomic landmarks. In the sitting position about one-fourth of the decrease in the ERV was accounted for by the hydrostatic pressure of the water on the abdomen and the remainder by the pressure on the thorax. Immersion to the level of the spinous process of the seventh cervical vertebra was equivalent to 28 cmH2o continuous negative pressure breathing in air. In the supine position, a comparable value was 8 cmH2o. These observations agree well with those of others if differences in the levels of immersion are accounted for.
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50
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Dvorak M, Konecna H. [Acino-insular cells of the pancreas in the rat embryo]. C R Assoc Anat 1970; 149:1081-3. [PMID: 4335973] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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