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2. Imaging of Patients with Complex Hemodialysis Arterio-Venous Fistulas using Time-Resolved Dynamic CT Angiography: Comparison with Duplex Ultrasound

Author

Stefan O. Schoenberg, Sonja Sudarski, Daniela Rose, Nicole Geiger, Thomas Henzler, Mathias Meyer, Urs Benck, and Melissa M. Ong

Subjects
Adult, Male, medicine.medical_specialty, Computed Tomography Angiography, Fistula, lcsh:Medicine, 030204 cardiovascular system & hematology, Article, 030218 nuclear medicine & medical imaging, 03 medical and health sciences, Arteriovenous Shunt, Surgical, 0302 clinical medicine, Forearm, Renal Dialysis, medicine, Humans, Thrombus, lcsh:Science, Aged, Computed tomography angiography, Ultrasonography, Doppler, Duplex, Multidisciplinary, medicine.diagnostic_test, business.industry, Ultrasound, lcsh:R, Thrombosis, Middle Aged, medicine.disease, Aneurysm, Stenosis, medicine.anatomical_structure, Arteriovenous Fistula, Angiography, Kidney Failure, Chronic, Female, lcsh:Q, Radiology, business
Abstract

To evaluate the feasibility and potential on therapy management of time-resolved dynamic computed tomography angiography (dCTA) in patients with forearm arterio-venous fistula (AVF)/arterio-venous grafts (AVG). Thirty-five patients with complex failing forearm AVF/AVGs were examined with ultrasound and a dCTA protocol. Diagnosis and therapy management was evaluated versus duplex ultrasound (DUS) in three different readouts: 1. all dCTA datasets; 2. one arterial phase of the dCTA dataset; 3. one arterial and one venous dataset out of the dCTA dataset. All reads were performed >30 days apart from each other. Using all data of the dCTA examination, 20 patients were classified as having a stenosis >50%, 12 high-shunt flow, 11 partial thrombosis, 5 venous aneurysms and 5 complete thrombosis of their AVF/AVG grafts. This lead to 13 additional pathologic findings not visible on DUS and reclassification as normal in one patient with suspected AVF stenosis and complete thrombus on DUS. These additional findings lead to a direct change of therapeutic management in 8 patients. Compared to readout 1 (53 pathologies), readout number 2 and 3 revealed only 33 and 41 pathologies, respectively. dCTA provides additional information, improving diagnostic confidence and leading to changes in therapy management when compared to DUS alone.

Published
2017
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5. Pump-Assisted Enteral Nutrition Can Prevent Aspiration in Bedridden Percutaneous Endoscopic Gastrostomy Patients

Author

Joerg W. Sturm, Stefan Post, Edward Shang, and Nicole Geiger

Subjects
Blood Glucose, Diarrhea, Male, medicine.medical_specialty, Vomiting, 030309 nutrition & dietetics, medicine.medical_treatment, Medicine (miscellaneous), Aspiration pneumonia, Pneumonia, Aspiration, Enteral administration, law.invention, 03 medical and health sciences, Enteral Nutrition, 0302 clinical medicine, Randomized controlled trial, law, Surveys and Questionnaires, Percutaneous endoscopic gastrostomy, medicine, Humans, Intubation, Prospective Studies, Intensive care medicine, Intubation, Gastrointestinal, Infusion Pumps, Aged, Gastrostomy, 0303 health sciences, Cross-Over Studies, Nutrition and Dietetics, business.industry, medicine.disease, humanities, Clinical trial, Glucose, Treatment Outcome, Parenteral nutrition, Area Under Curve, Female, 030211 gastroenterology & hepatology, Safety, business, Bed Rest, Gravitation
Abstract

Vomiting, aspiration, and pneumonia are serious side effects in enteral feeding via percutaneous endoscopic gastrostomy (PEG), which often leads to hospitalization. To this day, it has not been proven whether pump-assisted (PA) or gravity-controlled application is the safer method for long-term feeding via PEG in bedridden patients.This study was conducted as a prospective, randomized crossover study. Fifty bedridden PEG patients were fed using the pump-assisted method (G1) and 50 patients were fed using the gravity-controlled feeding method (G2). After 6 weeks of observation (O1), the feeding methods in both groups were switched, followed by another 6 weeks of observation (O2). Daily recording was done using a standardized questionnaire. The glucose levels during O1 and O2 were determined on days 1, 21, and 42.The patients in both groups were compatible in age, sex, and medical illness. By comparing G1 and G2, a significantly lower regurgitation rate (p.0002), vomiting of feeding substrate (p.009), aspiration (p.01), and pneumonia (p.02) was observed. The diarrhea rate in G2 was higher than in G1 (p.007). The glucose profiles in G1 showed a significantly better development (p.0007) than the ones in G2. After switching the application method in G2, the PA group (now G2) showed a significantly improved rate of regurgitation, vomiting, aspiration, and diarrhea and improved glucose profiles.Feeding via PA shows improved safety, which is documented in a lower rate of diarrhea, regurgitation, vomiting, and aspiration. PA also noted a more effective glucose metabolization, which results in better glucose levels. As a result of this prospective study, pump-assisted feeding is recommended for bedridden patients requiring long-term feeding via PEG.

Published
2004
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6. The IVS data input to ITRF2014

Author

Axel Nothnagel, Walter Alef, Jun Amagai, Per Helge Andersen, James Anderson, Tatiana Andreeva, Thomas Artz, Sabine Bachmann, Kyriakos Balidakis, Christophe Barache, Alain Baudry, Erhard Bauernfeind, Karen Baver, Christopher Beaudoin, Dirk Behrend, Antoine Bellanger, Anton Berdnikov, Per Bergman, Simone Bernhart, Alessandra Bertarini, Giuseppe Bianco, Ewald Bielmaier, David Boboltz, Johannes Böhm, Sigrid Böhm, Armin Boer, Sergei Bolotin, Mireille Bougeard, Geraldine Bourda, Sylvain Brazeau, Salvo Buttaccio, Letizia Cannizzaro, Roger Cappallo, Brent Carlson, Merri Sue Carter, Patrick Charlot, Chenyu Chen, Maozheng Chen, Jungho Cho, Thomas Clark, Arnaud Collioud, Francisco Colomer, Giuseppe Colucci, Ludwig Combrinck, John Conway, Brian Corey, Ronald Curtis, Mike Daniels, Reiner Dassing, Maria Davis, Pablo de-Vicente, Aletha De Witt, Alexey Diakov, John Dickey, Christopher Dieck, Irv Diegel, Koichiro Doi, Hermann Drewes, Maurice Dube, Gunnar Elgered, Gerald Engelhardt, Mark Evangelista, Qingyuan Fan, Stephen Farley, Leonid Fedotov, Alan Fey, Ricardo Figueroa, Yoshihiro Fukuzaki, Daniel Gambis, Susana Garcia-Espada, Ralph Gaume, Nicole Geiger, John Gipson, Susanne Glaser, Frank Gomez, Jesus Gomez-Gonzalez, David Gordon, Ramesh Govind, Vadim Gubanov, Sergei Gulyaev, Ruediger Haas, David Hall, Sebastian Halsig, Roger Hammargren, Hayo Hase, R. Heinkelmann, Leif Helldner, Cristian Herrera, Ed Himwich, Thomas Hobiger, Christoph Holst, Xiaoyu Hong, Mareki Honma, Xinyong Huang, Urs Hugentobler, Ryuichi Ichikawa, Andreas Iddink, Johannes Ihde, Gennadiy Ilijin, Roxanne Inniss, Alexander Ipatov, Irina Ipatova, Misao Ishihara, D. V. Ivanov, Chris Jacobs, Takaaki Jike, Karl-Ake Johansson, Heidi Johnson, Kenneth Johnston, Hyunhee Ju, Masao Karasawa, Maria Karbon, Pierre Kaufmann, Ryoji Kawabata, Noriyuki Kawaguchi, Eiji Kawai, Michael Kaydanovsky, Mikhail Kharinov, Hideyuki Kobayashi, Kensuke Kokado, Tetsuro Kondo, Edward Korkin, Yasuhiro Koyama, Hana Krasna, Gerhard Kronschnabl, Sergey Kurdubov, Shinobu Kurihara, Jiro Kuroda, Younghee Kwak, Laura La Porta, Ruth Labelle, Jacques LaFrance, Doug Lamb, Sébastien Lambert, Line Langkaas, Roberto Lanotte, Alexey Lavrov, Karine Le Bail, Judith Leek, Bing Li, Huihua Li, Jinling Li, Liu Li, Shiguang Liang, Michael Lindqvist, Xiang Liu, Michael Loesler, Jim Long, Colin Lonsdale, Jim Lovell, Stephen Lowe, Antonio Lucena, Brian Luzum, Chopo Ma, Jun Ma, Giuseppe Maccaferri, Morito Machida, Dan MacMillan, Matthias Madzak, Zinovy Malkin, Seiji Manabe, Franco Mantovani, Vyacheslav Mardyshkin, Dmitry Marshalov, Geir Mathiassen, Shigeru Matsuzaka, Dennis McCarthy, Alexey Melnikov, Linda Messerschmitt, Andrey Mikhailov, Natalia Miller, Donald Mitchell, Julian Andres Mora-Diaz, Arno Mueskens, Yasuko Mukai, Mauro Nanni, Tim Natusch, Monia Negusini, Alexander Neidhardt, Marisa Nickola, George Nicolson, Arthur Niell, Pavel Nikitin, Tobias Nilsson, Tong Ning, Takashi Nishikawa, Carey Noll, Kentarou Nozawa, Clement Ogaja, Hongjong Oh, Hans Olofsson, Per Erik Opseth, Sandro Orfei, Rosa Pacione, Katherine Pazamickas, Felipe Pedreros, William Petrachenko, Lars Pettersson, Pedro Pino, Lucia Plank, Christian Ploetz, Michael Poirier, Joseph Popelar, Markku Poutanen, Zhihan Qian, Jonathan Quick, Ismail Rahimov, Jay Redmond, Brett Reid, John Reynolds, Bernd Richter, Maria Rioja, Andres Romero-Wolf, Chester Ruszczyk, Alexander Salnikov, Pierguido Sarti, Raimund Schatz, Hans-Georg Scherneck, Francesco Schiavone, Ralf Schmid, Ulrich Schreiber, H. Schuh, Walter Schwarz, Cecilia Sciarretta, Anthony Searle, Mamoru Sekido, Manuela Seitz, Stanislav Shabala, Minghui Shao, Kazuo Shibuya, Fengchun Shu, Moritz Sieber, Asmund Skjaeveland, Elena Skurikhina, Sergey Smolentsev, Dan Smythe, Benedikt Soja, Adeildo Sombra, Don Sousa, Ojars Sovers, John Spitzak, Laura Stanford, Carlo Stanghellini, Alan Steppe, Rich Strand, Jing Sun, Igor Surkis, Kazuhiro Takashima, Kazuhiro Takefuji, Hiroshi Takiguchi, Yoshiaki Tamura, Tadashi Tanabe, Emine Tanir, An Tao, Claudio Tateyama, Kamil Teke, Cynthia Thomas, Volkmar Thorandt, Bruce Thornton, Claudia Tierno Ros, Oleg Titov, Mike Titus, Paolo Tomasi, Vincenza Tornatore, Corrado Trigilio, Dmitriy Trofimov, Masanori Tsutsumi, Gino Tuccari, Tasso Tzioumis, Hideki Ujihara, Dieter Ullrich, Minttu Uunila, Daniel Veillette, Tiziana Venturi, Francesco Vespe, Veniamin Vityazev, Alexandr Volvach, Alexander Vytnov, Guangli Wang, Jinqing Wang, Lingling Wang, Na Wang, Shiqiang Wang, Wenren Wei, Stuart Weston, Alan Whitney, Reiner Wojdziak, Yaroslav Yatskiv, Wenjun Yang, Shuhua Ye, Sangoh Yi, Aili Yusup, Octavio Zapata, Reinhard Zeitlhoefler, Hua Zhang, Ming Zhang, Xiuzhong Zhang, Rongbing Zhao, Weimin Zheng, Ruixian Zhou, and Nataliya Zubko

Published
2015

7. U. S. Naval Observatory VLBI Analysis Center

Author

Chris Dieck, Alan L. Fey, David Hall, Nicole Geiger, and David A. Boboltz

Subjects
Earth Orientation Parameters, Geography, Mauna kea, Observatory, United States Naval Observatory, Very-long-baseline interferometry, Naval research, Very Long Baseline Array, Remote sensing, Analysis center
Abstract

This report summarizes the activities of the VLBI Analysis Center at the United States Naval Observatory for the 2012 calendar year. Over the course of the year, Analysis Center personnel continued analysis and timely submission of IVS-R4 databases for distribution to the IVS. During the 2012 calendar year, the USNO VLBI Analysis Center produced two VLBI global solutions designated as usn2012a and usn2012b. Earth orientation parameters (EOP) based on this solution and updated by the latest diurnal (IVS-R1 and IVS-R4) experiments were routinely submitted to the IVS. Sinex files based upon the bi-weekly 24-hour experiments were also submitted to the IVS. During the 2012 calendar year, Analysis Center personnel continued a program to use the Very Long Baseline Array (VLBA) operated by the NRAO for the purpose of measuring UT1-UTC. Routine daily 1-hour duration Intensive observations were initiated using the VLBA antennas at Pie Town, NM and Mauna Kea, HI. High-speed network connections to these two antennas are now routinely used for electronic transfer of VLBI data over the Internet to a USNO point of presence. A total of 270 VLBA Intensive experiments were observed and electronically transferred to and processed at USNO in 2012.

Published
2013
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