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Bommena S, Mahmud N, Boike JR, Thornburg BG, Kolli KP, Lai JC, German M, Morelli G, Spengler E, Said A, Desai AP, Junna S, Paul S, Frenette C, Verna EC, Goel A, Gregory D, Padilla C, VanWagner LB, Fallon MB. The impact of right atrial pressure on outcomes in patients undergoing TIPS, an ALTA group study. Hepatology 2023; 77:2041-2051. [PMID: 36651170 PMCID: PMC10192025 DOI: 10.1097/hep.0000000000000283] [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] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Accepted: 12/08/2022] [Indexed: 01/19/2023]
Abstract
BACKGROUND AND AIMS Single-center studies in patients undergoing TIPS suggest that elevated right atrial pressure (RAP) may influence survival. We assessed the impact of pre-TIPS RAP on outcomes using the Advancing Liver Therapeutic Approaches (ALTA) database. APPROACH AND RESULTS Total 883 patients in ALTA multicenter TIPS database from 2010 to 2015 from 9 centers with measured pre-TIPS RAP were included. Primary outcome was mortality. Secondary outcomes were 48-hour post-TIPS complications, post-TIPS portal hypertension complications, and post-TIPS inpatient admission for heart failure. Adjusted Cox Proportional hazards and competing risk model with liver transplant as a competing risk were used to assess RAP association with mortality. Restricted cubic splines were used to model nonlinear relationship. Logistic regression was used to assess RAP association with secondary outcomes.Pre-TIPS RAP was independently associated with overall mortality (subdistribution HR: 1.04 per mm Hg, 95% CI, 1.01, 1.08, p =0.009) and composite 48-hour complications. RAP was a predictor of TIPS dysfunction with increased odds of post-90-day paracentesis in outpatient TIPS, hospital admissions for renal dysfunction, and heart failure. Pre-TIPS RAP was positively associated with model for end-stage liver disease, body mass index, Native American and Black race, and lower platelets. CONCLUSIONS Pre-TIPS RAP is an independent risk factor for overall mortality after TIPS insertion. Higher pre-TIPS RAP increased the odds of early complications and overall portal hypertensive complications as potential mechanisms for the mortality impact.
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Affiliation(s)
- Shoma Bommena
- Department of Internal Medicine, Banner University Medical Center, University of Arizona College of Medicine-Phoenix, Phoenix, Phoenix, Arizona, USA
| | - Nadim Mahmud
- Division of Gastroenterology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA
| | - Justin R. Boike
- Division of Gastroenterology and Hepatology, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
| | - Bartley G. Thornburg
- Division of Vascular and Interventional Radiology, Department of Radiology, Northwestern University, Chicago, Illinois, USA
| | - Kanti P. Kolli
- Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, California, USA
| | - Jennifer C. Lai
- Division of Gastroenterology and Hepatology, Department of Medicine, University of California San Francisco, San Francisco, California, USA
| | - Margarita German
- Division of Gastroenterology and Hepatology, Department of Medicine, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, USA
| | - Giuseppe Morelli
- Division of Gastroenterology, Hepatology, Department of Medicine, and Nutrition, University of Florida Health, Gainesville, Florida, USA
| | - Erin Spengler
- Division of Gastroenterology and Hepatology, Department of Medicine, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, USA
| | - Adnan Said
- Division of Gastroenterology and Hepatology, Department of Medicine, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, USA
| | - Archita P. Desai
- Division of Gastroenterology and Hepatology, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Shilpa Junna
- Division of Gastroenterology and Hepatology, Department of Medicine, University of Michigan, Ann Arbor, Michigan, USA
| | - Sonali Paul
- Department of Internal Medicine, Section of Gastroenterology and Nutrition, The University of Chicago Medicine, Chicago, Illinois, USA
| | - Catherine Frenette
- Department for Organ and Cell Transplantation, The Scripps Clinic, La Jolla, California, USA
| | - Elizabeth C. Verna
- Department of Medicine, Center for Liver Disease and Transplantation, Columbia University College of Physicians & Surgeons, New York, New York, USA
| | - Aparna Goel
- Division of Gastroenterology and Hepatology, Department of Medicine, Stanford University, Stanford, California, USA
| | - Dyanna Gregory
- Division of Gastroenterology and Hepatology, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
| | - Cynthia Padilla
- Division of Gastroenterology and Hepatology, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
| | - Lisa B. VanWagner
- Division of Digestive and Liver Diseases, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Michael B. Fallon
- Department of Internal Medicine, Banner University Medical Center, University of Arizona College of Medicine-Phoenix, Phoenix, Phoenix, Arizona, USA
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Boike JR, Thornburg BG, Asrani SK, Fallon MB, Fortune BE, Izzy MJ, Verna EC, Abraldes JG, Allegretti AS, Bajaj JS, Biggins SW, Darcy MD, Farr MA, Farsad K, Garcia-Tsao G, Hall SA, Jadlowiec CC, Krowka MJ, Laberge J, Lee EW, Mulligan DC, Nadim MK, Northup PG, Salem R, Shatzel JJ, Shaw CJ, Simonetto DA, Susman J, Kolli KP, VanWagner LB. North American Practice-Based Recommendations for Transjugular Intrahepatic Portosystemic Shunts in Portal Hypertension. Clin Gastroenterol Hepatol 2022; 20:1636-1662.e36. [PMID: 34274511 PMCID: PMC8760361 DOI: 10.1016/j.cgh.2021.07.018] [Citation(s) in RCA: 74] [Impact Index Per Article: 37.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Revised: 07/01/2021] [Accepted: 07/13/2021] [Indexed: 02/07/2023]
Abstract
Complications of portal hypertension, including ascites, gastrointestinal bleeding, hepatic hydrothorax, and hepatic encephalopathy, are associated with significant morbidity and mortality. Despite few high-quality randomized controlled trials to guide therapeutic decisions, transjugular intrahepatic portosystemic shunt (TIPS) creation has emerged as a crucial therapeutic option to treat complications of portal hypertension. In North America, the decision to perform TIPS involves gastroenterologists, hepatologists, and interventional radiologists, but TIPS creation is performed by interventional radiologists. This is in contrast to other parts of the world where TIPS creation is performed primarily by hepatologists. Thus, the successful use of TIPS in North America is dependent on a multidisciplinary approach and technical expertise, so as to optimize outcomes. Recently, new procedural techniques, TIPS stent technology, and indications for TIPS have emerged. As a result, practices and outcomes vary greatly across institutions and significant knowledge gaps exist. In this consensus statement, the Advancing Liver Therapeutic Approaches group critically reviews the application of TIPS in the management of portal hypertension. Advancing Liver Therapeutic Approaches convened a multidisciplinary group of North American experts from hepatology, interventional radiology, transplant surgery, nephrology, cardiology, pulmonology, and hematology to critically review existing literature and develop practice-based recommendations for the use of TIPS in patients with any cause of portal hypertension in terms of candidate selection, procedural best practices and, post-TIPS management; and to develop areas of consensus for TIPS indications and the prevention of complications. Finally, future research directions are identified related to TIPS for the management of portal hypertension.
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Affiliation(s)
- Justin R. Boike
- Department of Medicine, Division of Gastroenterology & Hepatology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Bartley G. Thornburg
- Department of Radiology, Division of Vascular and Interventional Radiology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | | | - Michael B. Fallon
- Department of Medicine, Division of Gastroenterology and Hepatology, Banner - University Medical Center Phoenix, Phoenix, AZ, USA
| | - Brett E. Fortune
- Department of Medicine, Division of Gastroenterology and Hepatology, Weill Cornell Medical College, New York, NY, USA
| | - Manhal J. Izzy
- Department of Medicine, Division of Gastroenterology, Hepatology, and Nutrition, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Elizabeth C. Verna
- Department of Medicine, Division of Digestive and Liver Diseases, Columbia University College of Physicians & Surgeons, New York, NY, USA
| | - Juan G. Abraldes
- Division of Gastroenterology (Liver Unit), University of Alberta, Edmonton, AB, Canada
| | - Andrew S. Allegretti
- Department of Medicine, Division of Nephrology, Massachusetts General Hospital, Boston, MA, USA
| | - Jasmohan S. Bajaj
- Department of Internal Medicine, Division of Gastroenterology, Hepatology, and Nutrition, Virginia Commonwealth University and Central Virginia Veterans Healthcare System, Richmond, VA, USA
| | - Scott W. Biggins
- Department of Medicine, Division of Gastroenterology & Hepatology, University of Washington Medical Center, Seattle, WA, USA
| | - Michael D. Darcy
- Department of Radiology, Division of Interventional Radiology, Washington University School of Medicine, St. Louis, MO, USA
| | - Maryjane A. Farr
- Department of Medicine, Division of Cardiology, Columbia University College of Physicians & Surgeons, New York, NY, USA
| | - Khashayar Farsad
- Dotter Department of Interventional Radiology, Oregon Health and Science University, Portland, OR, USA
| | - Guadalupe Garcia-Tsao
- Department of Digestive Diseases, Yale University, Yale University School of Medicine, and VA-CT Healthcare System, CT, USA
| | - Shelley A. Hall
- Department of Internal Medicine, Division of Cardiology, Baylor University Medical Center, Dallas, TX, USA
| | - Caroline C. Jadlowiec
- Department of Surgery, Division of Transplant Surgery, Mayo Clinic, Phoenix, AZ, USA
| | - Michael J. Krowka
- Department of Pulmonary and Critical Care Medicine, Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA
| | - Jeanne Laberge
- Department of Radiology and Biomedical Imaging, Division of Interventional Radiology, University of California San Francisco, San Francisco, CA, USA
| | - Edward W. Lee
- Department of Radiology, Division of Interventional Radiology, University of California-Los Angeles David Geffen School of Medicine, Los Angeles, CA, USA
| | - David C. Mulligan
- Department of Surgery, Division of Transplantation, Yale University School of Medicine, New Haven, CT, USA
| | - Mitra K. Nadim
- Department of Medicine, Division of Nephrology and Hypertension, University of Southern California, Los Angeles, California, USA
| | - Patrick G. Northup
- Department of Medicine, Division of Gastroenterology and Hepatology, University of Virginia, Charlottesville, VA, USA
| | - Riad Salem
- Department of Radiology, Division of Vascular and Interventional Radiology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Joseph J. Shatzel
- Division of Hematology and Medical Oncology, Oregon Health and Science University, Portland, OR, USA
| | - Cathryn J. Shaw
- Department of Radiology, Division of Interventional Radiology, Baylor University Medical Center, Dallas, TX, USA
| | - Douglas A. Simonetto
- Department of Physiology, Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA
| | - Jonathan Susman
- Department of Radiology, Division of Interventional Radiology, Columbia University Irving Medical Center, New York, NY, USA
| | - K. Pallav Kolli
- Department of Radiology and Biomedical Imaging, Division of Interventional Radiology, University of California San Francisco, San Francisco, CA, USA
| | - Lisa B. VanWagner
- Department of Medicine, Division of Gastroenterology & Hepatology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA,Department of Preventive Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, USA,Address for correspondence: Lisa B. VanWagner MD MSc FAST FAHA, Assistant Professor of Medicine and Preventive Medicine, Divisions of Gastroenterology & Hepatology and Epidemiology, Northwestern University Feinberg School of Medicine, 676 N. St Clair St - Suite 1400, Chicago, Illinois 60611 USA, Phone: 312 695 1632, Fax: 312 695 0036,
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Gordon AC, Gupta AN, Gabr A, Thornburg BG, Kulik LM, Ganger DR, Maddur H, Flamm SL, Boike JR, Moore CM, Borja-Cacho D, Christopher DA, Katariya NN, Ladner DP, Caicedo-Ramirez JC, Riaz A, Salem R, Lewandowski RJ. Safety and Efficacy of Segmental Yttrium-90 Radioembolization for Hepatocellular Carcinoma after Transjugular Intrahepatic Portosystemic Shunt Creation. J Vasc Interv Radiol 2021; 32:211-219. [PMID: 33349507 DOI: 10.1016/j.jvir.2020.09.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Revised: 08/28/2020] [Accepted: 09/08/2020] [Indexed: 01/06/2023] Open
Abstract
PURPOSE To evaluate safety and efficacy of segmental yttrium-90 (Y90) radioembolization for hepatocellular carcinoma (HCC) after transjugular intrahepatic portosystemic shunt (TIPS) placement. The hypothesis was liver sparing segmental Y90 for HCC after TIPS would provide high antitumor response with a tolerable safety profile. MATERIALS AND METHODS This single-arm retrospective study included 39 patients (16 women, 23 men) with ages 49-81 years old who were treated with Y90. Child-Pugh A/B liver dysfunction was present in 72% (28/39) with a median Model for End-stage Liver Disease score of 18 (95% confidence interval, 16.4-19.4). Primary outcomes were clinical and biochemical toxicities and antitumor imaging response by World Health Organization (WHO) and European Association for the Study of the Liver (EASL) criteria. Secondary outcomes were orthotopic liver transplantation (OLT), time to progression (TTP), and overall survival (OS) estimates by the Kaplan-Meier method. RESULTS The 30-day mortality was 0%. Grade 3+ clinical adverse events and grade 3+ hyperbilirubinemia occurred in 5% (2/39) and 0% (0/39), respectively. Imaging response was achieved in 58% (22/38, WHO criteria) and 74% (28/38, EASL criteria), respectively. Median TTP was 16.1 months for any cause and 27.5 months for primary index lesions. OLT was completed in 88% (21/24) of listed patients at a median time of 6.1 months (range, 0.9-11.7 months). Median OS was 31.6 months and 62.9 months censored and uncensored to OLT, respectively. CONCLUSIONS Segmental Y90 for HCC appears safe and efficacious in patients after TIPS. Preserved transplant eligibility suggests that Y90 is a useful tool for bridging these patients to liver transplantation.
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Affiliation(s)
- Andrew C Gordon
- Section of Interventional Radiology, Department of Radiology, Northwestern University, Chicago, Illinois
| | - Aakash N Gupta
- Section of Interventional Radiology, Department of Radiology, Northwestern University, Chicago, Illinois
| | - Ahmed Gabr
- Section of Interventional Radiology, Department of Radiology, Northwestern University, Chicago, Illinois
| | - Bartley G Thornburg
- Section of Interventional Radiology, Department of Radiology, Northwestern University, Chicago, Illinois
| | - Laura M Kulik
- Section of Interventional Radiology, Department of Radiology, Northwestern University, Chicago, Illinois; Division of Gastroenterology and Hepatology, Department of Medicine, Northwestern University, Chicago, Illinois; Division of Transplant Surgery, Department of Surgery, Northwestern University, Chicago, Illinois
| | - Daniel R Ganger
- Division of Gastroenterology and Hepatology, Department of Medicine, Northwestern University, Chicago, Illinois; Division of Transplant Surgery, Department of Surgery, Northwestern University, Chicago, Illinois
| | - Haripriya Maddur
- Division of Gastroenterology and Hepatology, Department of Medicine, Northwestern University, Chicago, Illinois
| | - Steven L Flamm
- Division of Gastroenterology and Hepatology, Department of Medicine, Northwestern University, Chicago, Illinois; Division of Transplant Surgery, Department of Surgery, Northwestern University, Chicago, Illinois
| | - Justin R Boike
- Division of Gastroenterology and Hepatology, Department of Medicine, Northwestern University, Chicago, Illinois
| | - Christopher M Moore
- Division of Gastroenterology and Hepatology, Department of Medicine, Northwestern University, Chicago, Illinois
| | - Daniel Borja-Cacho
- Division of Transplant Surgery, Department of Surgery, Northwestern University, Chicago, Illinois
| | - Derrick A Christopher
- Division of Transplant Surgery, Department of Surgery, Northwestern University, Chicago, Illinois
| | - Nitin N Katariya
- Division of Transplant Surgery, Department of Surgery, Northwestern University, Chicago, Illinois
| | - Daniela P Ladner
- Division of Transplant Surgery, Department of Surgery, Northwestern University, Chicago, Illinois; Department of Medical Social Sciences, Northwestern University, Chicago, Illinois
| | - Juan C Caicedo-Ramirez
- Division of Transplant Surgery, Department of Surgery, Northwestern University, Chicago, Illinois
| | - Ahsun Riaz
- Section of Interventional Radiology, Department of Radiology, Northwestern University, Chicago, Illinois
| | - Riad Salem
- Section of Interventional Radiology, Department of Radiology, Northwestern University, Chicago, Illinois; Division of Transplant Surgery, Department of Surgery, Northwestern University, Chicago, Illinois; Division of Hematology and Oncology, Department of Medicine, Northwestern University, Chicago, Illinois
| | - Robert J Lewandowski
- Section of Interventional Radiology, Department of Radiology, Northwestern University, Chicago, Illinois; Division of Transplant Surgery, Department of Surgery, Northwestern University, Chicago, Illinois; Division of Hematology and Oncology, Department of Medicine, Northwestern University, Chicago, Illinois.
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Keller EJ, Kennedy KY, Patel AP, Ivanovic M, Collins JD, Sato K, Thornburg BG, Riaz A, Nemcek AA, Desai K, Lewandowski RJ, Salem R, Vogelzang RL, Hickey R. Perceptions of Quality in Interventional Oncology. J Vasc Interv Radiol 2018; 29:367-372.e1. [PMID: 29395900 DOI: 10.1016/j.jvir.2017.10.033] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2017] [Revised: 10/25/2017] [Accepted: 10/31/2017] [Indexed: 11/17/2022] Open
Abstract
PURPOSE To inductively characterize perceptions of quality in interventional oncology (IO) based on values and experiences of patients and referring providers. MATERIALS AND METHODS Brief ethnographic interviews were completed with referring providers and patients before and after a variety of liver-directed procedures about their experiences, concerns, and perceptions of IO services at a single institution. Constructivist grounded theory was used to systematically analyze interview transcripts for themes until thematic saturation was achieved. All transcripts were analyzed by a reviewer with 3-years of experience performing such analyses, and 50% were randomly selected to be coded by 2 additional blinded reviewers. Interreviewer agreement was assessed via Cohen κ. RESULTS Interviews with 22 patients (mean age, 65 y ± 13; 9 women) and 12 providers (mean age, 54 y ± 9; 6 women) were required to reach and confirm thematic saturation. Interreviewer agreement for interview themes was excellent (κ = 0.78; P < .001). Perceptions of high-quality IO care relied on interventional radiologists being responsive, friendly, and open; engaging in multidisciplinary collaboration; having thoughtful, dedicated support staff; and facilitating well-coordinated care after procedures and follow-up more than technical expertise and periprocedural comfort. Patient and provider perceptions of quality differed, but disjointed care after procedures was the most common critique among both groups. CONCLUSIONS An inductive qualitative approach effectively characterized specific aspects of perceptions of high-quality IO care among patients and referring providers.
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Affiliation(s)
- Eric J Keller
- Center for Bioethics and Medical Humanities, Northwestern University Feinberg School of Medicine, 737 North Michigan Avenue, Suite 1600, Chicago, IL 60611.
| | - Kristie Y Kennedy
- Division of Interventional Radiology, Northwestern University Feinberg School of Medicine, 737 North Michigan Avenue, Suite 1600, Chicago, IL 60611
| | - Akash P Patel
- Department of Radiology, Northwestern University Feinberg School of Medicine, 737 North Michigan Avenue, Suite 1600, Chicago, IL 60611
| | - Maja Ivanovic
- Department of Radiology, Northwestern University Feinberg School of Medicine, 737 North Michigan Avenue, Suite 1600, Chicago, IL 60611
| | - Jeremy D Collins
- Division of Interventional Radiology, Northwestern University Feinberg School of Medicine, 737 North Michigan Avenue, Suite 1600, Chicago, IL 60611
| | - Kent Sato
- Division of Interventional Radiology, Northwestern University Feinberg School of Medicine, 737 North Michigan Avenue, Suite 1600, Chicago, IL 60611
| | - Bartley G Thornburg
- Division of Interventional Radiology, Northwestern University Feinberg School of Medicine, 737 North Michigan Avenue, Suite 1600, Chicago, IL 60611
| | - Ahsun Riaz
- Division of Interventional Radiology, Northwestern University Feinberg School of Medicine, 737 North Michigan Avenue, Suite 1600, Chicago, IL 60611
| | - Albert A Nemcek
- Division of Interventional Radiology, Northwestern University Feinberg School of Medicine, 737 North Michigan Avenue, Suite 1600, Chicago, IL 60611
| | - Kush Desai
- Division of Interventional Radiology, Northwestern University Feinberg School of Medicine, 737 North Michigan Avenue, Suite 1600, Chicago, IL 60611
| | - Robert J Lewandowski
- Division of Interventional Radiology, Northwestern University Feinberg School of Medicine, 737 North Michigan Avenue, Suite 1600, Chicago, IL 60611
| | - Riad Salem
- Division of Interventional Radiology, Northwestern University Feinberg School of Medicine, 737 North Michigan Avenue, Suite 1600, Chicago, IL 60611
| | - Robert L Vogelzang
- Division of Interventional Radiology, Northwestern University Feinberg School of Medicine, 737 North Michigan Avenue, Suite 1600, Chicago, IL 60611
| | - Ryan Hickey
- Division of Interventional Radiology, Northwestern University Feinberg School of Medicine, 737 North Michigan Avenue, Suite 1600, Chicago, IL 60611
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Abstract
Recurrent deep venous thrombosis and inferior vena cava (IVC) thrombosis are well-described complications following IVC filter placement. IVC thrombosis ranges in severity of clinical presentation, but can lead to significant morbidity and mortality with incidence rates depending on patient population and type of filter used. Endovascular therapies such as catheter-directed thrombolysis, mechanical thrombectomy, balloon venoplasty, and stenting are safe and effective in restoration of venous patency.
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Affiliation(s)
- Jessica M Andreoli
- Department of Radiology, Section of Interventional Radiology, Northwestern Memorial Hospital, Chicago, Illinois
| | - Bartley G Thornburg
- Department of Radiology, Section of Interventional Radiology, Northwestern Memorial Hospital, Chicago, Illinois
| | - Ryan M Hickey
- Department of Radiology, Section of Interventional Radiology, Northwestern Memorial Hospital, Chicago, Illinois
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Thornburg BG, Gotea V, Makałowski W. Transposable elements as a significant source of transcription regulating signals. Gene 2006; 365:104-10. [PMID: 16376497 DOI: 10.1016/j.gene.2005.09.036] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2005] [Revised: 09/06/2005] [Accepted: 09/27/2005] [Indexed: 10/25/2022]
Abstract
Transposable elements (TEs) are major components of eukaryotic genomes, contributing about 50% to the size of mammalian genomes. TEs serve as recombination hot spots and may acquire specific cellular functions, such as controlling protein translation and gene transcription. The latter is the subject of the analysis presented. We scanned TE sequences located in promoter regions of all annotated genes in the human genome for their content in potential transcription regulating signals. All investigated signals are likely to be over-represented in at least one TE class, which shows that TEs have an important potential to contribute to pre-transcriptional gene regulation, especially by moving transcriptional signals within the genome and thus potentially leading to new gene expression patterns. We also found that some TE classes are more likely than others to carry transcription regulating signals, which can explain why they have different retention rates in regions neighboring genes.
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Affiliation(s)
- Bartley G Thornburg
- Institute of Molecular Evolutionary Genetics and Department of Biology, Pennsylvania State University, University Park, PA 16802, USA
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