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Gnutzmann D, Mechel J, Schmitz A, Bellemann N, Sommer CM, Gockner T, Mokry T, Kortes N, Stampfl U, Kauczor HU, Radeleff BA. Vergleich der Plasma- und Gewebekonzentrationskinetik von Irinotecan zweier unterchiedlicher mit Irinotecan beladener Partikel. ROFO-FORTSCHR RONTG 2014. [DOI: 10.1055/s-0034-1373006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Schmitz A, Gnutzmann D, Bellemann N, Mokry T, Kortes N, Sommer C, Gotthard D, Weiss KH, Stampfl U, Kauczor HU, Radeleff B. Erste Erfahrungen mit der superselektiven TANDEM® TACE in Heidelberg. ROFO-FORTSCHR RONTG 2014. [DOI: 10.1055/s-0034-1373007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Vollherbst D, Fritz S, Zelzer S, Wachter MF, Bellemann N, Gockner T, Mokry T, Gnutzmann D, Schmitz A, Aulmann S, Stampfl U, Pereira PL, Kauczor HU, Werner J, Radeleff BA, Sommer CM. Transarterielle Chemoembolisation (TACE) in Kombination mit irreversibler Elektroporation (IRE): Eine experimentelle Machbarkeitsstudie zur perkutanen Elektrochemotherapie in der Leber. ROFO-FORTSCHR RONTG 2014. [DOI: 10.1055/s-0034-1373476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Schmitz A, Gnutzmann D, Bellemann N, Mokry T, Kortes N, Sommer C, Gotthard D, Weiss K, Stampfl U, Radeleff B, Kauczor H. First experiences with superselective TANDEM® TACE in Heidelberg. J Vasc Interv Radiol 2014. [DOI: 10.1016/j.jvir.2013.12.406] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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Schmitz A, Zielinski J, Dick B, Mevissen M. In vitro
metabolism of testosterone in the horse liver and involvement of equine CYPs 3A89, 3A94 and 3A95. J Vet Pharmacol Ther 2014; 37:338-47. [DOI: 10.1111/jvp.12106] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2013] [Accepted: 12/24/2013] [Indexed: 02/03/2023]
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Knirsch W, Rhein MV, Scheer I, Liamlahi R, Bernet V, Dave H, Schmitz A, Latal B. Cerebral MRI Findings and Neurodevelopmental Outcome in Patients Operated for Congenital Heart Disease - From the Neonate to the Adolescent. Thorac Cardiovasc Surg 2013. [DOI: 10.1055/s-0033-1354531] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Stefanski A, Mevissen M, Möller AM, Kuehni-Boghenbor K, Schmitz A. Induction of cytochrome P450 enzymes in primary equine hepatocyte culture. Toxicol In Vitro 2013; 27:2023-30. [DOI: 10.1016/j.tiv.2013.07.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2013] [Revised: 07/05/2013] [Accepted: 07/24/2013] [Indexed: 01/30/2023]
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Bertholdt S, Latal B, Liamlahi R, Pretre R, Scheer I, Goetti R, Dave H, Bernet V, Schmitz A, von Rhein M, Knirsch W. Cerebral lesions on magnetic resonance imaging correlate with preoperative neurological status in neonates undergoing cardiopulmonary bypass surgery. Eur J Cardiothorac Surg 2013; 45:625-32. [DOI: 10.1093/ejcts/ezt422] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Schmitz A, Radeleff B, Sommer CM, Kortes N, Bellemann N, Ganten T, Stampfl U, Kauczor HU. Erste Ergebnisse mit der superselectiver DEB-TACE unter der Verwendung von 100 µm TANDEM®-Partikel. ROFO-FORTSCHR RONTG 2013. [DOI: 10.1055/s-0033-1346397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Doherty-Bone TM, Gonwouo NL, Hirschfeld M, Ohst T, Weldon C, Perkins M, Kouete MT, Browne RK, Loader SP, Gower DJ, Wilkinson MW, Rödel MO, Penner J, Barej MF, Schmitz A, Plötner J, Cunningham AA. Batrachochytrium dendrobatidis in amphibians of Cameroon, including first records for caecilians. DISEASES OF AQUATIC ORGANISMS 2013; 102:187-194. [PMID: 23446968 DOI: 10.3354/dao02557] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Amphibian chytrid fungus Batrachochytrium dendrobatidis (Bd) has been hypothesised to be an indigenous parasite of African amphibians. In Cameroon, however, previous surveys in one region (in the northwest) failed to detect this pathogen, despite the earliest African Bd having been recorded from a frog in eastern Cameroon, plus one recent record in the far southeast. To reconcile these contrasting results, we present survey data from 12 localities across 6 regions of Cameroon from anurans (n = 1052) and caecilians (n = 85) of ca. 108 species. Bd was detected in 124 amphibian hosts at 7 localities, including Mt. Oku, Mt. Cameroon, Mt. Manengouba and lowland localities in the centre and west of the country. None of the hosts were observed dead or dying. Infected amphibian hosts were not detected in other localities in the south and eastern rainforest belt. Infection occurred in both anurans and caecilians, making this the first reported case of infection in the latter order (Gymnophiona) of amphibians. There was no significant difference between prevalence and infection intensity in frogs and caecilians. We highlight the importance of taking into account the inhibition of diagnostic qPCR in studies on Bd, based on all Bd-positive hosts being undetected when screened without bovine serum albumin in the qPCR mix. The status of Bd as an indigenous, cosmopolitan amphibian parasite in Africa, including Cameroon, is supported by this work. Isolating and sequencing strains of Bd from Cameroon should now be a priority. Longitudinal host population monitoring will be required to determine the effects, if any, of the infection on amphibians in Cameroon.
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Peters L, Demmel S, Pusch G, Buters J, Thormann W, Zielinski J, Leeb T, Mevissen M, Schmitz A. Equine cytochrome P450 2B6 — Genomic identification, expression and functional characterization with ketamine. Toxicol Appl Pharmacol 2013; 266:101-8. [DOI: 10.1016/j.taap.2012.10.028] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2012] [Revised: 10/19/2012] [Accepted: 10/26/2012] [Indexed: 01/23/2023]
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Bødker J, Gyrup C, Johansen P, Schmitz A, Madsen J, Johnsen H, Bøgsted M, Dybkær K, Nyegaard M. Performance Comparison of Affymetrix SNP6.0 and Cytogenetic 2.7M Whole-Genome Microarrays in Complex Cancer Samples. Cytogenet Genome Res 2012. [DOI: 10.1159/000345125] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
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Naujocks G, Schmitz A, Schramm J, Wiestler O, Schirrmacher V. Peripheral immunization against malignant rat glioma can induce effective antitumor immunity in the brain. Int J Oncol 2012; 6:759-65. [PMID: 21556600 DOI: 10.3892/ijo.6.4.759] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Using two malignant rat glioma cell lines, we tested to what extent peripheral immunization could affect tumor growth in the brain of syngeneic rats. Peripheral subcutaneous (s.c.) immunization was performed with autologous Newcastle-disease-virus (NDV)-infected or non-infected live tumor cells. Thus immunized rats or non-immunized controls were intracerebrally implanted with increasing numbers of the respective malignant glioma cells. Without immunization the mean survival time after intracerebral implantation of 1x10(4) TZ363 or RG2 glioma cells was 9 and 29 days respectively. After s.c. immunization with either NDV-infected or non-infected TZ363 cells only 25% or less of challenged animals developed tumors in the brain. Immunization with NDV only had no effect. In RG2 glioma, s.c. immunization had no effect on tumor growth in the central nervous system and on survival time, no matter what kind of vaccine was used. These results clearly show, that in principle the efferent arm of the anti-tumor response can be effective accross the blood-brain barrier and extend into the microenvironment of the central nervous system. Whether or not glioma lines can induce this immunity and respond to it, seems to depend on their individual immunobiological characteristics.
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Treschan TA, Kaisers W, Schaefer MS, Bastin B, Schmalz U, Wania V, Eisenberger CF, Saleh A, Weiss M, Schmitz A, Kienbaum P, Sessler DI, Pannen B, Beiderlinden M. Ventilation with low tidal volumes during upper abdominal surgery does not improve postoperative lung function. Br J Anaesth 2012; 109:263-71. [PMID: 22661750 DOI: 10.1093/bja/aes140] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Prolonged postoperative decrease in lung function is common after major upper abdominal surgery. Evidence suggests that ventilation with low tidal volumes may limit the damage during mechanical ventilation. We compared postoperative lung function of patients undergoing upper abdominal surgery, mechanically ventilated with high or low tidal volumes. METHODS This was a double-blind, prospective, randomized controlled clinical trial. One hundred and one patients (age ≥ 50 yr, ASA ≥ II, duration of surgery ≥ 3 h) were ventilated with: (i) high [12 ml kg(-1) predicted body weight (PBW)] or (ii) low (6 ml kg(-1) PBW) tidal volumes intraoperatively. The positive end-expiratory pressure was 5 cm H(2)O in both groups and breathing frequency adjusted to normocapnia. Time-weighted averages (TWAs) of forced vital capacity (FVC) and forced expiratory volume in 1 s (FEV(1)) until 120 h after operation were compared (P<0.025 considered statistically significant). Secondary outcomes were oxygenation, respiratory and non-respiratory complications, length of stay and mortality. RESULTS The mean (sd) values of TWAs of FVC and FEV(1) were similar in both groups: FVC: 6 ml group 1.8 (0.7) litre vs 12 ml group 1.6 (0.5) litre (P=0.12); FEV(1): 6 ml group 1.4 (0.5) litre vs 12 ml group 1.2 (0.4) litre (P=0.15). FVC and FEV(1) at any single time point and secondary outcomes did not differ significantly between groups. CONCLUSIONS Prolonged impaired lung function after major abdominal surgery is not ameliorated by low tidal volume ventilation.
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Henze D, Doecke WD, Hornung D, Machens K, Schmitz A, Zollner T, Gashaw I. Trefoil factor 3 - a new biomarker candidate for experimental and clinical endometriosis. J Reprod Immunol 2012. [DOI: 10.1016/j.jri.2012.03.356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Schmitz A. Erfahrungen mit der Radiologie im Staatsexamen. ROFO-FORTSCHR RONTG 2012. [DOI: 10.1055/s-0032-1310569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Shiue CY, Schmitz A, Pourdehnad MT, Shiue GG, Schirrmacher R, Vatamaniuk M, Doliba N, Matschinsky F, Wolf B, Alavi A. Synthesis of β-cell imaging agents. J Labelled Comp Radiopharm 2012. [DOI: 10.1002/jlcr.2580440139] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Schmitz A, Kellenberger C, Lochbuehler N, Fruehauf M, Klaghofer R, Fruehauf H, Weiss M. Effect of different quantities of a sugared clear fluid on gastric emptying and residual volume in children: a crossover study using magnetic resonance imaging. Br J Anaesth 2012; 108:644-7. [DOI: 10.1093/bja/aer497] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Nowaczyk P, Herold S, Kim P, Schmitz A, Polom K, Murawa P, Morgenthaler N, Zabel M, Luecke K, Murawa D. 61 Functionalized and Structured Medical Wire as a Device for In-vivo Isolation of Circulating Tumor Cells in Breast Cancer Patients. Eur J Cancer 2012. [DOI: 10.1016/s0959-8049(12)70129-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Heyden A, Tomasi T, Zeni N, Herold S, Nowaczyk P, Schmitz A, Krahn T, Zabel M, Murawa D, Luecke K. PP 45 In vivo isolation of circulating tumor cells. Eur J Cancer 2011. [DOI: 10.1016/s0959-8049(11)72660-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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Schmitz A, Kellenberger C, Liamlahi R, Studhalter M, Weiss M. Gastric emptying after overnight fasting and clear fluid intake: a prospective investigation using serial magnetic resonance imaging in healthy children †. Br J Anaesth 2011; 107:425-9. [DOI: 10.1093/bja/aer167] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Lessing C, Schmitz A, Schrappe M. Varianz in der Epidemiologie unerwünschter Ereignisse: Methodik des Harvard Medical Practice Design. DAS GESUNDHEITSWESEN 2011; 74:95-103. [DOI: 10.1055/s-0031-1275707] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Schmitz A, Rick T, Karolski T, Kuhlen T, Kobbelt L. Efficient Rasterization for Outdoor Radio Wave Propagation. IEEE TRANSACTIONS ON VISUALIZATION AND COMPUTER GRAPHICS 2011; 17:159-170. [PMID: 20548114 DOI: 10.1109/tvcg.2010.96] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Conventional beam tracing can be used for solving global illumination problems. It is an efficient algorithm and performs very well when implemented on the GPU. This allows us to apply the algorithm in a novel way to the problem of radio wave propagation. The simulation of radio waves is conceptually analogous to the problem of light transport. We use a custom, parallel rasterization pipeline for creation and evaluation of the beams. We implement a subset of a standard 3D rasterization pipeline entirely on the GPU, supporting 2D and 3D frame buffers for output. Our algorithm can provide a detailed description of complex radio channel characteristics like propagation losses and the spread of arriving signals over time (delay spread). Those are essential for the planning of communication systems required by mobile network operators. For validation, we compare our simulation results with measurements from a real-world network. Furthermore, we account for characteristics of different propagation environments and estimate the influence of unknown components like traffic or vegetation by adapting model parameters to measurements.
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Paiva B, Pérez-Andrés M, Vídriales MB, Almeida J, de las Heras N, Mateos MV, López-Corral L, Gutiérrez NC, Blanco J, Oriol A, Hernández MT, de Arriba F, de Coca AG, Terol MJ, de la Rubia J, González Y, Martín A, Sureda A, Schmidt-Hieber M, Schmitz A, Johnsen HE, Lahuerta JJ, Bladé J, San-Miguel JF, Orfao A. Competition between clonal plasma cells and normal cells for potentially overlapping bone marrow niches is associated with a progressively altered cellular distribution in MGUS vs myeloma. Leukemia 2011; 25:697-706. [PMID: 21252988 DOI: 10.1038/leu.2010.320] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Disappearance of normal bone marrow (BM) plasma cells (PC) predicts malignant transformation of monoclonal gammopathy of undetermined significance (MGUS) and smoldering myeloma (SMM) into symptomatic multiple myeloma (MM). The homing, behavior and survival of normal PC, but also CD34(+) hematopoietic stem cells (HSC), B-cell precursors, and clonal PC largely depends on their interaction with stromal cell-derived factor-1 (SDF-1) expressing, potentially overlapping BM stromal cell niches. Here, we investigate the distribution, phenotypic characteristics and competitive migration capacity of these cell populations in patients with MGUS, SMM and MM vs healthy adults (HA) aged >60 years. Our results show that BM and peripheral blood (PB) clonal PC progressively increase from MGUS to MM, the latter showing a slightly more immature immunophenotype. Of note, such increased number of clonal PC is associated with progressive depletion of normal PC, B-cell precursors and CD34(+) HSC in the BM, also with a parallel increase in PB. In an ex vivo model, normal PC, B-cell precursors and CD34(+) HSC from MGUS and SMM, but not MM patients, were able to abrogate the migration of clonal PC into serial concentrations of SDF-1. Overall, our results show that progressive competition and replacement of normal BM cells by clonal PC is associated with more advanced disease in patients with MGUS, SMM and MM.
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Kuske S, Lessing C, Lux R, Schmitz A, Schrappe M. Patientensicherheitsindikatoren zur Arzneimitteltherapiesicherheit (AMTS-PSI): Internationaler Status, Übertragbarkeit und Validierung. DAS GESUNDHEITSWESEN 2011; 74:79-86. [DOI: 10.1055/s-0030-1269838] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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