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Meyer-Lindemann U, Mauersberger C, Schmidt AC, Moggio A, Hinterdobler J, Li X, Khangholi D, Hettwer J, Gräßer C, Dutsch A, Schunkert H, Kessler T, Sager HB. Colchicine Impacts Leukocyte Trafficking in Atherosclerosis and Reduces Vascular Inflammation. Front Immunol 2022; 13:898690. [PMID: 35860249 PMCID: PMC9289246 DOI: 10.3389/fimmu.2022.898690] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Accepted: 06/13/2022] [Indexed: 11/22/2022] Open
Abstract
Background Inflammation strongly contributes to atherosclerosis initiation and progression. Consequently, recent clinical trials pharmacologically targeted vascular inflammation to decrease the incidence of atherosclerosis-related complications. Colchicine, a microtubule inhibitor with anti-inflammatory properties, reduced cardiovascular events in patients with recent acute coronary syndrome and chronic coronary disease. However, the biological basis of these observations remains elusive. We sought to explore the mechanism by which colchicine beneficially alters the course of atherosclerosis. Methods and Results In mice with early atherosclerosis (Apoe-/- mice on a high cholesterol diet for 8 weeks), we found that colchicine treatment (0.25 mg/kg bodyweight once daily over four weeks) reduced numbers of neutrophils, inflammatory monocytes and macrophages inside atherosclerotic aortas using flow cytometry and immunohistochemistry. Consequently, colchicine treatment resulted in a less inflammatory plaque composition and reduced plaque size. We next investigated how colchicine prevented plaque leukocyte expansion and found that colchicine treatment mitigated recruitment of blood neutrophils and inflammatory monocytes to plaques as revealed by adoptive transfer experiments. Causally, we found that colchicine reduced levels of both leukocyte adhesion molecules and receptors for leukocyte chemoattractants on blood neutrophils and monocytes. Further experiments showed that colchicine treatment reduced vascular inflammation also in post-myocardial infarction accelerated atherosclerosis through similar mechanisms as documented in early atherosclerosis. When we examined whether colchicine also decreased numbers of macrophages inside atherosclerotic plaques by impacting monocyte/macrophage transitioning or in-situ proliferation of macrophages, we report that colchicine treatment did not influence macrophage precursor differentiation or macrophage proliferation using cell culture experiments with bone marrow derived macrophages. Conclusions Our data reveal that colchicine prevents expansion of plaque inflammatory leukocytes through lowering recruitment of blood myeloid cells to plaques. These data provide novel mechanistic clues on the beneficial effects of colchicine in the treatment of atherosclerosis and may inform future anti-inflammatory interventions in patients at risk.
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Affiliation(s)
- Ulrike Meyer-Lindemann
- Department of Cardiology, German Heart Centre Munich, Technical University Munich, Munich, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Munich Heart Alliance, Munich, Germany
| | - Carina Mauersberger
- Department of Cardiology, German Heart Centre Munich, Technical University Munich, Munich, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Munich Heart Alliance, Munich, Germany
| | - Anna-Christina Schmidt
- Department of Cardiology, German Heart Centre Munich, Technical University Munich, Munich, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Munich Heart Alliance, Munich, Germany
| | - Aldo Moggio
- Department of Cardiology, German Heart Centre Munich, Technical University Munich, Munich, Germany
| | - Julia Hinterdobler
- Department of Cardiology, German Heart Centre Munich, Technical University Munich, Munich, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Munich Heart Alliance, Munich, Germany
| | - Xinghai Li
- Department of Cardiology, German Heart Centre Munich, Technical University Munich, Munich, Germany
| | - David Khangholi
- Department of Cardiology, German Heart Centre Munich, Technical University Munich, Munich, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Munich Heart Alliance, Munich, Germany
| | - Jan Hettwer
- Department of Cardiology, German Heart Centre Munich, Technical University Munich, Munich, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Munich Heart Alliance, Munich, Germany
| | - Christian Gräßer
- Department of Cardiology, German Heart Centre Munich, Technical University Munich, Munich, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Munich Heart Alliance, Munich, Germany
| | - Alexander Dutsch
- Department of Cardiology, German Heart Centre Munich, Technical University Munich, Munich, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Munich Heart Alliance, Munich, Germany
| | - Heribert Schunkert
- Department of Cardiology, German Heart Centre Munich, Technical University Munich, Munich, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Munich Heart Alliance, Munich, Germany
| | - Thorsten Kessler
- Department of Cardiology, German Heart Centre Munich, Technical University Munich, Munich, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Munich Heart Alliance, Munich, Germany
| | - Hendrik B. Sager
- Department of Cardiology, German Heart Centre Munich, Technical University Munich, Munich, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Munich Heart Alliance, Munich, Germany
- *Correspondence: Hendrik B. Sager,
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Heitmann J, Greulich T, Reinke C, Koehler U, Vogelmeier C, Becker HF, Schmidt AC, Canisius S. Comparison of the effects of nebivolol and valsartan on BP reduction and sleep apnoea activity in patients with essential hypertension and OSA. Curr Med Res Opin 2010; 26:1925-32. [PMID: 20560730 DOI: 10.1185/03007995.2010.497326] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
OBJECTIVES To investigate the effect of nebivolol, a third generation beta-blocker, on blood pressure (BP) reduction and polysomnographic parameters in hypertensive patients with mild-to-moderate obstructive sleep apnoea (OSA). METHODS In this double-blind, parallel group study, patients were randomized to nebivolol 5 mg or valsartan 80 mg once daily following a 14-day, placebo run-in period during which any antihypertensive medication were discontinued. BP and heart rate measurements and overnight polysomnography were performed at baseline and after 6 weeks of treatment. Safety and tolerability were assessed. RESULTS Thirty-one patients were randomized to nebivolol (n = 16) or valsartan (n = 15). After six weeks both systolic and diastolic BP were effectively reduced by both treatments. Reductions in BP were not statistically significant different between agents, but mean heart rate was significantly decreased with nebivolol (compared with valsartan (p < 0.001). There was no statistically significant difference between both treatments for the change from baseline to treatment end for mean (+/-SD) Apnoea Hypopnoea Index (AHI) (nebivolol: 23.0 +/- 9.2 to 27.9 +/- 21.2 events/h; valsartan: 23.8 +/- 6.6 to 22.5 +/- 18.0 events/h; p = 0.48) or for any other sleep-related parameters. Both agents were well tolerated. CONCLUSION Nebivolol has a significant BP reduction effect in patients with OSA that is similar to valsartan and reduces heart rate to a greater extent which may prove beneficial in selected patients.
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Affiliation(s)
- J Heitmann
- Philipps-University Marburg, Marburg, Germany
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Gustin SM, Schwarz A, Birbaumer N, Sines N, Schmidt AC, Veit R, Larbig W, Flor H, Lotze M. NMDA-receptor antagonist and morphine decrease CRPS-pain and cerebral pain representation. Pain 2010; 151:69-76. [PMID: 20630656 DOI: 10.1016/j.pain.2010.06.022] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2009] [Revised: 04/26/2010] [Accepted: 06/18/2010] [Indexed: 10/19/2022]
Abstract
A combination therapy of morphine with an NMDA-receptor antagonist might be more effective than morphine without a NMDA-receptor antagonist for the relief of neuropathic pain in patients with complex regional pain syndrome (CRPS). In order to test the efficacy of this combination therapy we performed a double-blind randomized placebo-controlled study on patients suffering from CRPS of the upper extremity. We used functional magnetic resonance imaging during movement of the affected and unaffected upper hand before and after a treatment regimen of 49 days that contrasted morphine and an NMDA-receptor antagonist with morphine and placebo. We postulated superior pain relief for the combination therapy and concomitant changes in brain areas associated with nociceptive processing. Only the combination therapy reduced pain at rest and during movement, and disability. After treatment, activation in the contralateral primary somatosensory (cS1) and anterior cingulate cortex was significantly reduced when the affected hand was moved. Pain relief during therapy was related to decreased activation in cS1 and secondary somatosensory cortex (S2). Our data suggest that the combination of morphine with an NMDA-receptor antagonist significantly affects the cerebral processing of nociceptive information in CRPS. The correlation of pain relief and decrease in cortical activity in cS1 and S2 is in accordance with the expected impact of the NMDA-receptor antagonist on cerebral pain processing with emphasis on sensory-discriminative aspects of pain.
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Affiliation(s)
- S M Gustin
- Institute of Medical Psychology and Behavioral Neurobiology, University of Tübingen, Germany Ospedale San Camillo, Instituto di Ricovero e Cura a Carattere Scientifico, Venezia, Italy Traumatology Hospital of the University of Tübingen, Germany Department of Clinical and Cognitive Neuroscience, Central Institute of Mental Health, University of Heidelberg, Mannheim, Germany Functional Imaging, Institute for Diagnostic Radiology and Neuroradiology, University of Greifswald, Germany
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Martini SV, Fagundes SS, Schmidt AC, Avila M, Ornellas DS, Ribas VT, Petrs-Silva H, Linden R, Faffe DS, Guggino SE, Rocco PRM, Zin WA, Morales MM. Does the use of recombinant AAV5 in pulmonary gene therapy lead to lung damage? Respir Physiol Neurobiol 2009; 168:203-9. [PMID: 19573627 DOI: 10.1016/j.resp.2009.06.016] [Citation(s) in RCA: 3] [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] [Received: 01/27/2009] [Revised: 06/01/2009] [Accepted: 06/23/2009] [Indexed: 11/15/2022]
Abstract
This study investigated whether repeated administration of recombinant adeno-associated virus type 5 (rAAV5) to the airways induces inflammatory processes in the lungs of BALB/c-mice, with mechanical and histologic changes. Saline was instilled intratracheally in the control group, and rAAV5-green fluorescence protein (GFP) (4x10(11)particles) in the virus group (VR). These groups were subdivided into four subgroups: one dose analyzed 3 weeks later (VR1d3w) and two doses analyzed 1 (VR2d1w), 2 (VR2d2w) and 3 weeks (VR2d3w) after the second dose. Lung morphometry, mechanical parameters, airway responsiveness, rAAV5-GFP transduction and the expression of inflammatory cytokines were investigated. No significant differences in lung mechanics, airway responsiveness, and morphometry were observed. Re-administration of rAAV5 vector resulted in a decrease in GFP mRNA expression in the VR2d3w group. There was no evidence of inflammatory response or apoptosis in any group. rAAV5 did not induce an inflammatory process, mechanical or morphometric changes in the lungs. AAV5 may be an appropriate vector for lung gene therapy.
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Affiliation(s)
- S V Martini
- Laboratory of Cellular and Molecular Physiology, Chagas Filho Biophysics Institute, Federal University of Rio de Janeiro, Centro de Ciências da Saúde, Ilha do Fundão, Rio de Janeiro, Brazil
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5
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Minne A, Jaworska J, Gerhold K, Ahrens B, Avagyan A, Vanbever R, Matricardi PM, Schmidt AC, Hamelmann E. Intranasal delivery of whole influenza vaccine prevents subsequent allergen-induced sensitization and airway hyper-reactivity in mice. Clin Exp Allergy 2007; 37:1250-8. [PMID: 17651156 DOI: 10.1111/j.1365-2222.2007.02767.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Infection with influenza virus has been associated with seemingly opposing effects on the development of asthma. However, there are no data about the effects of mucosal vaccination with inactivated influenza on the inception of allergic asthma. OBJECTIVE To assess the immunological effects of inhaled inactivated influenza vaccine, using two different types of flu vaccines, on the inception of allergic sensitization and allergen-mediated airway disease in a mouse model. METHODS BALB/c mice were intranasally or intratracheally vaccinated with whole or split influenza virus vaccine (days -1 or -1, 27) before systemic sensitization with ovalbumin (OVA) (days 1, 14) and repeated airway allergen challenges (days 28-30). Allergen sensitization (IgE serum levels), airway inflammation (differential cells in bronchoalveolar lavage fluid) and airway hyper-reactivity (AHR) (in vivo lung function) were analysed. RESULTS The intranasal instillation of whole influenza vaccine before allergen sensitization significantly reduced the serum levels of total and OVA-specific IgE as well as allergen-induced AHR. Prevention was due to an allergen-specific shift from a predominant T helper (Th)2- towards a Th1-immune response. Application of split influenza vaccine did not show the same preventive effect. CONCLUSION Intranasal administration of inactivated whole influenza vaccine reduced subsequent allergen sensitization and prevented allergen-induced AHR. Our results show that the composition of the influenza vaccine has a major influence on subsequent development of allergen-induced sensitization and AHR, and suggest that mucosal inactivated whole influenza vaccination may represent a step towards the development of a preventive strategy for atopic asthma.
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Affiliation(s)
- A Minne
- Department for Pediatric Pneumology and Immunology, Charité University Medicine, Berlin, Germany
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6
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Bramlage P, Schindler C, Schmidt AC, Bramlage CP, Kirch W. [Recent examples for drug (developments) in primary, secondary and tertiary prevention]. Dtsch Med Wochenschr 2007; 132:2212-6. [PMID: 17926249 DOI: 10.1055/s-2007-991632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
The prevention of disease and the prevention of subsequent disease is one of the main themes in public health as well as in clinical medicine. Besides targeted interventions aiming at the total population (public health) individual steps like life style intervention and use of pharmacotherapy are important components. Taking acute myocardial infarction as an example it is illustrated, how risk factors can be targeted and which new drugs in development have been either just registered or are in late phase III of clinical testing shortly before registration and final approval. In this context it was shown that there are many exciting new options to reduce risk factors. On the other hand there are indications in which new drug development is likely not to contribute to an improvement of the situation (e. g. arterial hypertension) and in which further targeted intervention aiming at physicians (therapeutic pathways, guidelines, point of care research) and patients (life style intervention, compliance) has to be undertaken to improve the efficacy of currently available pharmacotherapy.
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Affiliation(s)
- P Bramlage
- Institut für Klinische Pharmakologie, Medizinische Fakultät Carl-Gustav-Carus, Technische Universität Dresden, Fiedlerstrasse 27, 01307 Dresden, Deutschland.
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7
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Schmidt AC, Bramlage P, Lichtenthal A, Eckert M, Scholze J. Socio-economic status and the therapeutic effectiveness of antihypertensive treatment--the design of the LEO study. Curr Med Res Opin 2007; 23:1987-95. [PMID: 17637203 DOI: 10.1185/030079907x226078] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
OBJECTIVE The risk of arterial hypertension and subsequent cardiovascular disease morbidity and mortality increases with low socio-economic status (SES). Even small differences in blood pressure, whether untreated or despite treatment, account for this substantial difference. Most of the increased risk in the low socio-economic group is due to traditional cardiovascular risk factors such as overweight and obesity, alcohol consumption and a sedentary life style. Intense treatment of arterial hypertension has been shown to overcome these prognostic inequalities. Therefore, drugs with high efficacy, optimal treatment adherence and a low potential for drug-related side effects are needed in order to reduce the cardiovascular risk burden of patients with a low SES. The angiotensin receptor blocker (ARB) olmesartan will be used to investigate the effectiveness of this drug in different socio-economic classes. RESEARCH DESIGN AND METHODS The LEO (Long-term Effectiveness of Olmesartan in different Socioeconomic groups) study is a large observational long-term study which has been set up to test the effectiveness of olmesartan within this context. The study has a matched-pairs design (1403 patients in both the low and the high socio-economic classes). MAIN OUTCOME MEASURES The LEO study will test whether this regimen can reduce the SES-related difference in long-term blood pressure control and compliance in the low SES population. CONCLUSIONS The study may generate valuable information about the antihypertensive effectiveness of olmesartan alone or in combination with hydrochlorothiazide in different socio-economic classes. It will further test whether the drug helps to reduce the inherent inequalities in cardiovascular prognosis between different socio-economic groups. CURRENT STATUS The study commenced in July 2007. Results are anticipated in December 2008.
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Affiliation(s)
- A C Schmidt
- Charité-Universitaetsmedizin, Department of Internal Medicine, Outpatient Clinic, Berlin, Germany.
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Uebel RA, Schmidt AC. The substitution of Phentolamine with an equal amount of Chlopromazine as an alpha-blocker in vasoactive cocktails used for intracavernous injection therapy for the treatment of erectile dysfunction. S Afr Fam Pract (2004) 2007. [DOI: 10.1080/20786204.2007.10873496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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9
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Schmidt AC, Schwarz I. Solid-state characterization of non-stoichiometric hydrates of ester-type local anaestheticsPart XI. Crystal polymorphism of local anaesthetic drugs. Int J Pharm 2006; 320:4-13. [PMID: 16857329 DOI: 10.1016/j.ijpharm.2006.04.017] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [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: 09/11/2005] [Revised: 02/27/2006] [Accepted: 03/23/2006] [Indexed: 11/23/2022]
Abstract
Three structurally closely related local anaesthetic drugs, hydroxyprocaine hydrochloride (4-butylamino-2-hydroxybenzoic acid 2-dimethylaminoethyl ester hydrochloride, HPCHC), tetracaine hydrochloride (4-butylamino-2-hydroxybenzoic acid 2-dimethylaminoethyl ester hydrochloride, TCHC) and hydroxytetracaine hydrochloride (4-butylamino-2-hydroxybenzoic acid 2-dimethylaminoethyl ester hydrochloride, SLCHC) are found to form hydrated crystals. Those were characterized by thermal analysis (hot stage microscopy, differential scanning calorimetry, thermogravimetry), vibrational spectroscopic methods (FTIR-, FT-Raman-spectroscopy), powder X-ray diffractometry, solid-state NMR and water sorption/desorption analysis. The formation and the stability of the hydrated solid phases are evaluated by sorption isotherms derived from different sorption/desorption analytic methods. The three substances investigated show conformational polymorphism with the anhydrated phases including a high temperature form mod. I, which is highly hygroscopic and isostructural with the hydrate. The hydrated form is present in commercial products at various contents. These hemihydrates crystallize from water, whereas the anhydrates crystallize from all other tested organic solvents. Different methods of water sorption/desorption analysis indicate the formation of non-stoichiometric hydrates. Different methods of drying lead to the same results. Solid-state NMR spectra were used to obtain both structural and molecular level mobility information.
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Affiliation(s)
- A C Schmidt
- Institute of Pharmacy, Department of Pharmaceutical Technology, University of Innsbruck, Innrain 52, 6020 Innsbruck, Austria.
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10
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Schmidt AC, Schwarz I, Mereiter K. Polymorphism and Pseudopolymorphism of Salicaine and Salicaine Hydrochloride Crystal Polymorphism of Local Anaesthetic Drugs, Part V. J Pharm Sci 2006; 95:1097-113. [PMID: 16565977 DOI: 10.1002/jps.20533] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The local anaesthetic drug salicaine hydrochloride (hydroxytetracaine hydrochloride, 4-butylamino-2-hydroxybenzoic acid 2-dimethylaminoethyl ester hydrochloride, SLCHC) and the free-base salicaine (SLC) were characterized by thermal analysis, vibrational and solid-state NMR-spectroscopy, X-ray powder diffraction, X-ray single crystal structure analysis, and water vapor sorption analysis. Additionally, the crystal structures of the anhydrate mod. II degrees (monoclinic, space group P2(1)/n), the hydrated mod. I (triclinic, space group P(bar)1), and of the free base (SLC) in the form of the hemihydrate (triclinic, space group P(bar)1 are discussed. Mod. II degrees of the polymorphic SLCHC is the thermodynamically stable form at room temperature and is present in commercial products mostly contaminated with a hydrated form that is isomorphic with mod. I. Mod. II degrees crystallizes from most organic solvents and from the melt below 110 degrees C. Mod. I crystallizes from the melt at temperatures above 110 degrees C, and additionally appears on dehydration of the hydrated mod. I. A third polymorph monotropically related to mod. II degrees was found by freeze-drying. The free-base SLC was found to crystallize from ethanol/water as a triclinic hemihydrate.
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Affiliation(s)
- A C Schmidt
- Department of Pharmaceutical Technology, University of Innsbruck, Innrain 52, 6020 Innsbruck, Austria.
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11
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Schmidt AC. Structural characteristics and crystal polymorphism of three local anaesthetic bases. Int J Pharm 2005; 298:186-97. [PMID: 15955643 DOI: 10.1016/j.ijpharm.2005.04.025] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2004] [Revised: 04/25/2005] [Accepted: 04/25/2005] [Indexed: 11/20/2022]
Abstract
Benzocaine (BZC), butambene (BTN) and isobutambene (BTI) are basic local anaesthetic agents of the ester type, preferentially used for surgery and dental procedures. The compounds, official in the USP (BZC and BTN) and Ph. Eur. (BZC), were each found to exist in two polymorphic crystal forms and their solid state characteristics have been determined by thermomicroscopy, differential scanning calorimetry (DSC), FTIR-, FT-Raman-spectroscopy as well as X-ray powder diffractometry. This work further emphasizes the comparison of solid state characteristics of three compounds with closely related structural features on molecular level, leading to opportunities for the investigation of structure-property relationships. Mod. I0 is the particular thermodynamically stable form at room temperature in all of the three systems. This form is present in commercial products and can be crystallized from solvents at room conditions. Mod. II can be obtained by annealing the supercooled melt or fast cooling of a saturated solution, respectively. The endothermic transformation of mod. II to mod. I0 upon heating confirms that mod. I0 is thermodynamically stable at ambient conditions (heat of transition rule) whereas mod. II is enantiotropically related to mod. I0, i.e. is metastable at temperatures above the transition temperature. The metastable forms show different kinetic stabilities at room temperature.
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Affiliation(s)
- A C Schmidt
- Institute of Pharmacy, Ph. Technology, University of Innsbruck, Innrain 52, 6020 Innsbruck, Austria.
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12
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Affiliation(s)
- A C Schmidt
- Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, 7 Center Drive, Bethesda, MD 20892-0720, USA.
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13
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Schmidt AC, McAuliffe JM, Murphy BR, Collins PL. Recombinant bovine/human parainfluenza virus type 3 (B/HPIV3) expressing the respiratory syncytial virus (RSV) G and F proteins can be used to achieve simultaneous mucosal immunization against RSV and HPIV3. J Virol 2001; 75:4594-603. [PMID: 11312329 PMCID: PMC114212 DOI: 10.1128/jvi.75.10.4594-4603.2001] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Recombinant bovine/human parainfluenza virus type 3 (rB/HPIV3), a recombinant bovine PIV3 (rBPIV3) in which the F and HN genes were replaced with their HPIV3 counterparts, was used to express the major protective antigens of respiratory syncytial virus (RSV) in order to create a bivalent mucosal vaccine against RSV and HPIV3. The attenuation of rB/HPIV3 is provided by the host range restriction of the BPIV3 backbone in primates. RSV G and F open reading frames (ORFs) were placed under the control of PIV3 transcription signals and inserted individually into the rB/HPIV3 genome in the promoter-proximal position preceding the nucleocapsid protein gene. The recombinant PIV3 expressing the RSV G ORF (rB/HPIV3-G1) was not restricted in its replication in vitro, whereas the virus expressing the RSV F ORF (rB/HPIV3-F1) was eightfold restricted compared to its rB/HPIV3 parent. Both viruses replicated efficiently in the respiratory tract of hamsters, and each induced RSV serum antibody titers similar to those induced by RSV infection and anti-HPIV3 titers similar to those induced by HPIV3 infection. Immunization of hamsters with rB/HPIV3-G1, rB/HPIV3-F1, or a combination of both viruses resulted in a high level of resistance to challenge with RSV or HPIV3 28 days later. These results describe a vaccine strategy that obviates the technical challenges associated with a live attenuated RSV vaccine, providing, against the two leading viral agents of pediatric respiratory tract disease, a bivalent vaccine whose attenuation phenotype is based on the extensive host range sequence differences of BPIV3.
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MESH Headings
- Animals
- Antibodies, Viral/biosynthesis
- Antibodies, Viral/blood
- Antigens, Viral/genetics
- Antigens, Viral/immunology
- Base Sequence
- Cattle
- Cell Line
- Cricetinae
- DNA, Viral
- Gene Expression
- Genetic Vectors/genetics
- Genetic Vectors/immunology
- Genetic Vectors/physiology
- Humans
- Immunity, Mucosal
- Macaca mulatta
- Molecular Sequence Data
- Mutagenesis, Insertional
- Open Reading Frames
- Parainfluenza Vaccines/genetics
- Parainfluenza Vaccines/immunology
- Parainfluenza Virus 3, Human/genetics
- Parainfluenza Virus 3, Human/immunology
- Recombination, Genetic
- Respiratory Syncytial Virus Infections/prevention & control
- Respiratory Syncytial Virus Vaccines/immunology
- Respiratory Syncytial Virus, Human/immunology
- Respiratory System/metabolism
- Respirovirus/genetics
- Respirovirus/immunology
- Respirovirus/physiology
- Respirovirus Infections/prevention & control
- Tumor Cells, Cultured
- Vaccination
- Vaccines, Synthetic/genetics
- Vaccines, Synthetic/immunology
- Viral Envelope Proteins/genetics
- Viral Envelope Proteins/immunology
- Viral Fusion Proteins/genetics
- Viral Fusion Proteins/immunology
- Viral Proteins/genetics
- Viral Proteins/immunology
- Virus Replication
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Affiliation(s)
- A C Schmidt
- Laboratory of Infectious Disease, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA.
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14
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Uebel RA, Wium CA, Schmidt AC. Stability evaluation of a prostaglandin E1 saline solution packed in insulin syringes. Int J Impot Res 2001; 13:16-7. [PMID: 11313835 DOI: 10.1038/sj.ijir.3900625] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2000] [Accepted: 10/03/2000] [Indexed: 11/09/2022]
Abstract
This article describes the preparation and stability of a sterile prostaglandin E1 solution. The solution is packed in insulin syringes as single dose injections for the treatment of erectile disfunction. The stability of this preparation is 24 weeks when stored at 5 degrees C.
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Affiliation(s)
- R A Uebel
- Department of Pharmacology, Faculty of Medicine, Tygerberg 7505, South Africa
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Schmidt AC, McAuliffe JM, Huang A, Surman SR, Bailly JE, Elkins WR, Collins PL, Murphy BR, Skiadopoulos MH. Bovine parainfluenza virus type 3 (BPIV3) fusion and hemagglutinin-neuraminidase glycoproteins make an important contribution to the restricted replication of BPIV3 in primates. J Virol 2000; 74:8922-9. [PMID: 10982335 PMCID: PMC102087 DOI: 10.1128/jvi.74.19.8922-8929.2000] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.9] [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: 12/18/2022] Open
Abstract
This study examines the contribution of the fusion (F) and hemagglutinin-neuraminidase (HN) glycoprotein genes of bovine parainfluenza virus type 3 (BPIV3) to its restricted replication in the respiratory tract of nonhuman primates. A chimeric recombinant human parainfluenza type 3 virus (HPIV3) containing BPIV3 F and HN glycoprotein genes in place of its own and the reciprocal recombinant consisting of BPIV3 bearing the HPIV3 F and HN genes (rBPIV3-F(H)HN(H)) were generated to assess the effect of glycoprotein substitution on replication of HPIV3 and BPIV3 in the upper and lower respiratory tract of rhesus monkeys. The chimeric viruses were readily recovered and replicated in simian LLC-MK2 cells to a level comparable to that of their parental viruses, suggesting that the heterologous glycoproteins were compatible with the PIV3 internal proteins. HPIV3 bearing the BPIV3 F and HN genes was restricted in replication in rhesus monkeys to a level similar to that of its BPIV3 parent virus, indicating that the glycoprotein genes of BPIV3 are major determinants of its host range restriction of replication in rhesus monkeys. rBPIV3-F(H)HN(H) replicated in rhesus monkeys to a level intermediate between that of HPIV3 and BPIV3. This observation indicates that the F and HN genes make a significant contribution to the overall attenuation of BPIV3 for rhesus monkeys. Furthermore, it shows that BPIV3 sequences outside the F and HN region also contribute to the attenuation phenotype in primates, a finding consistent with the previous demonstration that the nucleoprotein coding sequence of BPIV3 is a determinant of its attenuation for primates. Despite its restricted replication in the respiratory tract of rhesus monkeys, rBPIV3-F(H)HN(H) conferred a level of protection against challenge with HPIV3 that was indistinguishable from that induced by previous infection with wild-type HPIV3. The usefulness of rBPIV3-F(H)HN(H) as a vaccine candidate against HPIV3 and as a vector for other viral antigens is discussed.
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Affiliation(s)
- A C Schmidt
- Laboratory of Infectious Disease, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA.
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16
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Schmidt AC, Reisser W, Mattusch J, Popp P, Wennrich R. Evaluation of extraction procedures for the ion chromatographic determination of arsenic species in plant materials. J Chromatogr A 2000; 889:83-91. [PMID: 10985539 DOI: 10.1016/s0021-9673(00)00338-1] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.9] [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: 12/01/2022]
Abstract
The determination of arsenic species in plants grown on contaminated sediments and soils is important in order to understand the uptake, transfer and accumulation processes of arsenic. For the separation and detection of arsenic species, hyphenated techniques can be applied successfully in many cases. A lack of investigations exists in the handling (e.g., sampling, pre-treatment and extraction) of redox- and chemically labile arsenic species prior to analysis. This paper presents an application of pressurized liquid extraction (PLE) using water as the solvent for the effective extraction of arsenic species from freshly harvested plants. The method was optimized with respect to extraction time, number of extraction steps and temperature. The thermal stability of the inorganic and organic arsenic species under PLE conditions (60-180 degrees C) was tested. The adaptation of the proposed extraction method to freeze-dried, fine-grained material was limited because of the insufficient reproducibility in some cases.
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Affiliation(s)
- A C Schmidt
- University of Leipzig, Institute of Botany, Germany
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Affiliation(s)
- A C Schmidt
- Department of Urology, Medical Faculty, University of Stellenbosch, Tygerberg, South Africa
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Abstract
Ion chromatographic separation coupled with ICP-MS was used to determine arsenic species in plant and soil extracts. A scheme for growth, harvesting, sample pre-treatment and analysis was developed for the arsenic species to enable determination. Preliminary results obtained with ten herb plants grown on arsenic-contaminated soil compared to non-contaminated soil show a heterogeneous pattern of accumulation rate, metabolization and detoxification mechanisms in monocots and dicots. Arsenite appears to be the major component in plants with good growth. Organic arsenic species were even detected at very low concentrations (< 150 microg kg(-1) (dry mass)).
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Affiliation(s)
- J Mattusch
- UFZ-Center for Environmental Research Leipzig/Halle, Department of Analytical Chemistry, Germany
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Abstract
CONTEXT The magnitude of firearm-related deaths is known, but few studies have evaluated the magnitude and epidemiology of nonfatal firearm-related injuries. The circumstances resulting in fatal versus nonfatal injury are likely very different. No single data source provides complete details on nonfatal shootings. OBJECTIVE To establish a surveillance system to define the epidemiology of fatal and nonfatal firearm-related injuries. DESIGN Data were collected on fatal and nonfatal firearm-related injuries that occurred in 1995. SETTING State of Oklahoma. PARTICIPANTS Medical Examiner, Vital Statistics, hospital emergency and medical records departments, police departments, newspaper clipping service. MAIN OUTCOME MEASURES Incidence rate of firearm-related injuries; case-fatality rate; demographic, medical, and epidemiologic data; sensitivity of each reporting source; completeness of reporting. RESULTS The incidence rate of firearm-related injuries was 45.5 per 100,000 population. The case fatality rate was 35%. Injury rates were highest among adolescents, young adults, males, and African Americans. The Medical Examiner and Vital Statistics reported 87% and 98% of fatal cases, respectively. Passive surveillance of hospital emergency departments identified 72% of patients seeking hospital treatment. Among inpatients, 81% were identified by medical records departments. Newspaper clippings were obtained for 31% of cases. Information on the victim-perpetrator relationship and the type of firearm was available for 79% and 80% of cases, respectively. CONCLUSIONS Statewide surveillance of firearm-related injuries using multiple data sources is possible and provides a picture of the overall firearm-related injury problem. Strategies to enhance computer linkages of medical and police data should be pursued to maximize the sensitivity of reporting and minimize the costs of surveillance.
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Affiliation(s)
- P J Archer
- Injury Prevention Service, Oklahoma State Department of Health, Oklahoma City 73117-1299, USA
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Windt ML, Stander FS, Coetzee K, van der Merwe JP, Kruger TF, Schmidt AC. Intracytoplasmic sperm injection--new hope for severe male factor infertility. S Afr Med J 1997; 87:1154. [PMID: 9358843] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
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Iwata S, Schmidt AC, Titani K, Suzuki M, Kido H, Gotoh B, Hamaguchi M, Nagai Y. Assignment of disulfide bridges in the fusion glycoprotein of Sendai virus. J Virol 1994; 68:3200-6. [PMID: 8151783 PMCID: PMC236811 DOI: 10.1128/jvi.68.5.3200-3206.1994] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
The mature fusion (F) glycoprotein of the paramyxovirus family consists of two disulfide-linked subunits, the N-terminal F2 and the C-terminal F1 subunits, and contains 10 cysteine residues which are highly conserved at specific positions. The high level of conservation strongly suggests that they are indeed disulfide linked and play important roles in the folding and functioning of the molecule. However, it has not even been clarified which cysteine residues link the F2 and F1 subunits. This report describes our assignment of the disulfide bridges in purified Sendai virus F glycoprotein by fragmentation of the polypeptide and isolation of cystine-containing peptides and determination of their N-terminal sequences. The data demonstrate that all of the 10 cysteine residues participate in disulfide bridges and that Cys-70, the only cysteine in F2, and Cys-199, the most upstream cysteine in F1, form the interchain bond. Of the remaining eight cysteine residues clustered near the transmembrane domain of F1, the specific bridges identified are Cys-338 to Cys-347 and Cys-362 to Cys-370. Although no exact pairings between the subsequent four residues were defined, it seems likely that the most downstream, Cys-424, is linked to Cys-394, Cys-399, or Cys-401. Thus, we conclude that the cysteine-rich domain indeed contributes to the formation of a bunched structure containing at least two tandem cystine loops.
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Affiliation(s)
- S Iwata
- Research Institute for Disease Mechanism and Control, Nagoya University School of Medicine, Japan
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Schmidt AC, Bouic PJ, Heyns CF, De Kock ML. Peripheral blood lymphocyte response in patients with superficial transitional cell carcinoma of the bladder treated with intravesical Bacillus Calmette-Guérin--a useful marker of response? Br J Urol 1993; 71:179-82. [PMID: 8461951 DOI: 10.1111/j.1464-410x.1993.tb15914.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Intravesical instillation of Bacillus Calmette-Guérin (BCG) offers safe and effective short-term/long-term treatment for superficial transitional cell carcinoma (TCC) and TCC in situ of the bladder. However, 17 to 42% of patients may experience recurrence in spite of this therapy and a marker of effective treatment is of paramount importance. In this study the in vitro response of peripheral blood lymphocytes (PBL) to BCG was analysed in 10 patients with superficial TCC and TCC in situ before and during BCG instillations. The in vitro response of PBL to BCG, expressed as a stimulatory index (SI), revealed that 6 patients had a SI > 5 and 4 patients had a SI < 5. None of the former patients had recurrence of TCC during a mean follow-up of 17 months, while all of the latter patients experienced recurrence of TCC within 9 months. It was concluded that the in vitro response of PBL to BCG may be used as a marker of response to intravesical BCG treatment.
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Affiliation(s)
- A C Schmidt
- Department of Urology, University of Stellenbosch, Tygerberg, South Africa
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Schmidt AC, de Kock ML, de Klerk DP. [Intravesical BCG as a treatment for superficial and in situ transitional cell carcinoma of the bladder]. S Afr Med J 1990; 77:354-7. [PMID: 2321105] [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: 12/31/2022] Open
Abstract
Intravesical BCG is already established as effective therapy in the management of superficial bladder cancer. However, varying results have been obtained with different BCG strains; these are ascribed to variations in their immunogenicity. The locally available BCG strain which contains approximately 1.2 x 10(9) colony-forming units per 120 mg was used for intravesical instillation in 27 patients with recurrent superficial transitional cancer of the bladder. Ten of the 13 patients who received BCG prophylactically to reduce or stop recurrencies completed therapy and 7 (70%) were in remission after 1 or 2 courses with a mean follow-up of 2 years. Fourteen patients received BCG therapeutically for in situ carcinoma. Thirteen of these patients completed therapy and 9 (69%) responded favourably after 1 or 2 courses of BCG for a mean follow-up period of 23 months. Adverse effects of the treatment were mild and well tolerated except in a patient who received radiotherapy. Although 21 patients experienced irritable bladder symptoms only 1 discontinued treatment as a direct result. The only other patient in whom treatment had to be stopped, developed severe polyarthritis after 3 instillations. A statistically significant reduction in the number of recurrences (P less than 0.001) was experienced by the patients who received BCG prophylactically. Although this is a very limited study, the locally available BCG strain exhibited therapeutic activity. It is cost-effective and warrants further study.
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Affiliation(s)
- A C Schmidt
- Departement Urologie, Universiteit van Stellenbosch, Parowvallei
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van Niekerk LR, de Klerk DP, de Kock ML, Schmidt AC, Stockland B. Percutaneous nephrolithotomy. Experience with renal and proximal ureteral calculi at Tygerberg Hospital. S Afr Med J 1988; 73:5-8. [PMID: 3277295] [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: 01/05/2023] Open
Abstract
Percutaneous nephrolithotomy (PCN) enables the urologist to remove upper urinary tract stones through a percutaneous nephrostomy tract. The principal advantages of PCN are the low morbidity, shortened hospital stay and rapid recovery. Percutaneous puncture failed in 5 (11%) of the first 44 patients with upper tract urolithiasis treated by PCN at Tygerberg Hospital. In 35 patients (80%) PCN cleared the kidney of stones but in 4 patients (9%) all stone fragments were not removed during the procedure. If the puncture and dilatation was successful, then 90% of patients were stone-free after PCN. Complications were minimal except for a diabetic who died of septicaemia. PCN is an alternative to open renal surgery in the management of most upper urinary tract stones. The technique is readily mastered by any urologist experienced in endoscopic surgery.
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Affiliation(s)
- L R van Niekerk
- Department of Urology, University of Stellenbosch, Parowvallei, CP
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25
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Stosch M, Böcker R, Schmidt AC. [Thorotrast disease of the kidneys]. Urologe A 1983; 22:56-7. [PMID: 6682267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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de Kock ML, Schmidt AC, de Klerk JN. [Kidney transplantation at Tygerberg Hospital. A review of the surgical complications]. S Afr Med J 1982; 62:191-2. [PMID: 7048577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
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Schmidt AC, Kroll JL. [Internal ureter splinting, a promising therapy for iatrogenic ureteral injuries and ureteral stenoses in the small pelvis]. Urologe A 1980; 19:140-2. [PMID: 7404896] [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: 01/25/2023]
Abstract
The technique of endoscopically placed PVC indwelling splints into the lesioned or obstructed ureter is described. With the method of consecutive expanding of the ureter and following closed splinting, good results in 8 of 8 patients were achieved. The splints have been in place for 2,5 to 42 months. Indications, technique, complications and results are herein described.
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Hamilton JJ, Schmidt AC. Scoliosis with spontaneous transposition of the spinal cord. Clinical and autopsy study. J Bone Joint Surg Am 1975; 57:474-7. [PMID: 1141256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Abstract
A long-term analysis of 106 patients who had lumbar fusions between 1959 and 1969 is reported. The method used in this series was an inlay bone graft pointed at each end and beveled at its cephalic portion to permit easier insertion. The sacroiliac ligaments are not disturbed while obtaining the bone graft and no sacroiliac complications have occurred. The necessity for determining whether any psychophysiologic symptoms exist before a spinal fusion is emphasized. This study found the inlay facet technic of spinal fusion to be a worthwhile procedure in properly selected cases of low back and leg pain.
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Abstract
In this paper we describe how the art of weaving can be applied to fiber optics in order to produce precisely controlled reproducible image guides and image dissectors. As examples of the types of device for which woven fiber optics are applicable, we describe a 3:1 interleaver for use with a cathode-ray tube to produce color images, and a high speed alpha numeric output device. The techniques of weaving fiber optics are discussed in sufficient detail in order to allow for further work. Although, in principle, one might be able to weave glass optical fibers, all the work described here made use of plastic optical fibers 0.25 mm in diameter.
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Schmidt AC. Halo-tibial traction combined with the Milwaukee Brace. Clin Orthop Relat Res 1971; 77:73-83. [PMID: 5140462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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