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Pereira L, Echarte L, Romero M, Grazioli G, Pérez-Campos H, Francia A, Vicentino W, Mombrú AW, Faccio R, Álvarez I, Touriño C, Pardo H. Synthesis and characterization of a bovine collagen: GAG scaffold with Uruguayan raw material for tissue engineering. Cell Tissue Bank 2024; 25:123-142. [PMID: 34536180 DOI: 10.1007/s10561-021-09960-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2020] [Accepted: 09/06/2021] [Indexed: 11/28/2022]
Abstract
Tissue engineering (TE) and regenerative medicine offer strategies to improve damaged tissues by using scaffolds and cells. The use of collagen-based biomaterials in the field of TE has been intensively growing over the past decades. Mesenchymal stromal cells (MSCs) and dental pulp stem cells (DPSCs) are promising cell candidates for development of clinical composites. In this study, we proposed the development of a bovine collagen type I: chondroitin-6-sulphate (CG) scaffold, obtained from Uruguayan raw material (certified as free bovine spongiform encephalopathy), with CG crosslinking enhancement using different gamma radiation doses. Structural, biomechanical and chemical characteristics of the scaffolds were assessed by Scanning Electron Microscopy, axial tensile tests, FT-IR and Raman Spectroscopy, respectively. Once we selected the most appropriate scaffold for future use as a TE product, we studied the behavior of MSCs and DPSCs cultured on the scaffold by cytotoxicity, proliferation and differentiation assays. Among the diverse porous scaffolds obtained, the one with the most adequate properties was the one exposed to 15 kGy of gamma radiation. This radiation dose contributed to the crosslinking of molecules, to the formation of new bonds and/or to the reorganization of the collagen fibers. The selected scaffold was non-cytotoxic for the tested cells and a suitable substrate for cell proliferation. Furthermore, the scaffold allowed MSCs differentiation to osteogenic, chondrogenic, and adipogenic lineages. Thus, this work shows a promising approach to the synthesis of a collagen-scaffold suitable for TE.
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Affiliation(s)
- L Pereira
- Centro NanoMat, Facultad de Química, Instituto Polo Tecnológico de Pando, UdelaR, Camino Aparicio Saravia s/n, 9100, Pando, Canelones, Uruguay
| | - L Echarte
- Área Terapia Celular y Medicina Regenerativa (ATCMR), Departamento Básico de Medicina, Hospital de Clínicas, Facultad de Medicina, Universidad de la República (UdelaR), Montevideo, Uruguay
| | - M Romero
- Cátedra de Física, Facultad de Química, DETEMA, Universidad de la República (UdelaR), General Flores, 2124, 11800, Montevideo, Uruguay
| | - G Grazioli
- Cátedra de Materiales Dentales, Facultad de Odontología, Universidad de la República (UdelaR), Montevideo, Uruguay
| | - H Pérez-Campos
- Instituto Nacional de Donación y Trasplante (INDT), Ministerio de salud Pública-Hospital de Clínicas, Facultad de Medicina, Universidad de la República (UdelaR), Montevideo, Ministerio, Uruguay
| | - A Francia
- Fisiología general y bucodental, Facultad de Odontología, Universidad de la República (UdelaR), Montevideo, Uruguay
| | - W Vicentino
- Instituto Nacional de Donación y Trasplante (INDT), Ministerio de salud Pública-Hospital de Clínicas, Facultad de Medicina, Universidad de la República (UdelaR), Montevideo, Ministerio, Uruguay
| | - A W Mombrú
- Cátedra de Física, Facultad de Química, DETEMA, Universidad de la República (UdelaR), General Flores, 2124, 11800, Montevideo, Uruguay
| | - R Faccio
- Cátedra de Física, Facultad de Química, DETEMA, Universidad de la República (UdelaR), General Flores, 2124, 11800, Montevideo, Uruguay
| | - I Álvarez
- Instituto Nacional de Donación y Trasplante (INDT), Ministerio de salud Pública-Hospital de Clínicas, Facultad de Medicina, Universidad de la República (UdelaR), Montevideo, Ministerio, Uruguay
| | - C Touriño
- Área Terapia Celular y Medicina Regenerativa (ATCMR), Departamento Básico de Medicina, Hospital de Clínicas, Facultad de Medicina, Universidad de la República (UdelaR), Montevideo, Uruguay.
| | - H Pardo
- Cátedra de Física, Facultad de Química, DETEMA, Universidad de la República (UdelaR), General Flores, 2124, 11800, Montevideo, Uruguay.
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Echarte L, Grazioli G, Pereira L, Francia A, Pérez H, Kuzuian W, Vicentino W, Pardo H, Mombrú A, Maglia Á, Touriño C, Álvarez I. Processing methods for human amniotic membrane as scaffold for tissue engineering with mesenchymal stromal human cells. Cell Tissue Bank 2024; 25:269-283. [PMID: 35906514 DOI: 10.1007/s10561-022-10014-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Accepted: 04/27/2022] [Indexed: 11/30/2022]
Abstract
Tissue engineering is an interdisciplinary field that applies the principles of engineering and life sciences toward the development of biological substitutes that restore, maintain, or improve tissue function. The aims of this work were to compare chemically and physically processed human Amniotic Membranes (hAM) and analyze the cytocompatibility and proliferation rate (PR) of two primary human mesenchymal stromal cell lines, from different sources and donor conditions seeded over these scaffolds. The evaluated hAM processes were: cold shock to obtain a frozen amniotic membrane (FEAM) with remaining dead epithelial cells, denudation of hAM with trypsin for 20/10 min (DEAM20/10) or treatment with sodium dodecyl sulfate to decellularized hAM (DAM). All samples were sterilized with gamma radiation. The selection of the treated hAM to then generate composites was performed by scanning and transmission electron microscopy and characterization by X-ray diffraction, selecting DEAM10 and FEAM as scaffolds for cell seeding. Two sources of primary human stromal cells were used, both developed by our researchers, human Dental Pulp Stem Cells (hDPSC) from living donors and human Mesenchymal Stromal Cells (hMSC) from bone marrow isolated from brain dead donors. This last line of cells conveys a novel source of human cells that, to our knowledge, have not been tested as part of this type of construct. We developed four in vitro constructs without cytotoxicity signs and with different PR depending on the scaffolds and cells. hDPSC and hMSC grew over both FEAM and DEAM10, but DEAM10 allowed higher PR.
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Affiliation(s)
- L Echarte
- Área Terapia Celular y Medicina Regenerativa (ATCMR), Departamento Básico de Medicina, Hospital de Clínicas, Facultad de Medicina, UdelaR, Montevideo, Uruguay
| | - G Grazioli
- Cátedra de Materiales Dentales, Facultad de Odontología UdelaR, Montevideo, Uruguay
| | - L Pereira
- Departamento de Biomateriales, Facultad de Química, Parque Científico Tecnológico de Pando, UdelaR, Canelones, Uruguay
| | - A Francia
- Facultad de Odontología UdelaR, Fisiología General y Bucodental, Montevideo, Uruguay
| | - H Pérez
- Facultad de Medicina, Instituto Nacional de Donación y Trasplante (INDT), Ministerio de Salud Pública- Hospital de Clínicas, Universidad de La República (UdelaR), Montevideo, Uruguay
| | - W Kuzuian
- Facultad de Medicina, Instituto Nacional de Donación y Trasplante (INDT), Ministerio de Salud Pública- Hospital de Clínicas, Universidad de La República (UdelaR), Montevideo, Uruguay
| | - W Vicentino
- Facultad de Medicina, Instituto Nacional de Donación y Trasplante (INDT), Ministerio de Salud Pública- Hospital de Clínicas, Universidad de La República (UdelaR), Montevideo, Uruguay
| | - H Pardo
- Departamento de Biomateriales, Facultad de Química, Parque Científico Tecnológico de Pando, UdelaR, Canelones, Uruguay
| | - A Mombrú
- Departamento de Biomateriales, Facultad de Química, Parque Científico Tecnológico de Pando, UdelaR, Canelones, Uruguay
| | - Á Maglia
- Facultad de Odontología UdelaR, Cátedra de Histología y Embriología Bucodental, Montevideo, Uruguay
| | - C Touriño
- Área Terapia Celular y Medicina Regenerativa (ATCMR), Departamento Básico de Medicina, Hospital de Clínicas, Facultad de Medicina, UdelaR, Montevideo, Uruguay
| | - I Álvarez
- Facultad de Medicina, Instituto Nacional de Donación y Trasplante (INDT), Ministerio de Salud Pública- Hospital de Clínicas, Universidad de La República (UdelaR), Montevideo, Uruguay.
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Sanclemente G, Pardo H, Sánchez S, Bonfill X. Analysis of the Quality of Clinical Trials Published in Spanish-Language Dermatology Journals Between 1997 and 2012. Actas Dermosifiliogr 2015; 107:44-54. [PMID: 26546026 DOI: 10.1016/j.ad.2015.07.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2015] [Revised: 07/30/2015] [Accepted: 07/31/2015] [Indexed: 10/22/2022] Open
Abstract
INTRODUCTION The value of randomized clinical trials (RCTs) undertaken to identify an association between an intervention and an outcome is determined by their quality and scientific rigor. OBJECTIVE To assess the methodological quality of RCTs published in Spanish-language dermatology journals. METHODS By way of a systematic manual search, we identified all the RCTs in journals published in Spain and Latin America between 1997 (the year in which the CONSORT statement was published) and 2012. Risk of bias was evaluated for each RCT by assessing the following domains: randomization sequence generation, allocation concealment, blinding of patients and those assessing outcomes, missing data, and patient follow-up. Source of funding and conflict of interest statements, if any, were recorded for each study. RESULTS The search identified 70 RCTs published in 21 journals. Most of the RCTs had a high risk of bias, primarily because of gaps in the reporting of important methodological aspects. The source of funding was reported in only 15 studies. DISCUSSION AND CONCLUSIONS In spite of the considerable number of Spanish and Latin American journals, few RCTs have been published in the 15 years analyzed. Most of the RCTs published had serious defects in that the authors omitted methodological information essential to any evaluation of the quality of the trial and failed to report sources of funding or possible conflicts of interest for the authors involved. Authors of experimental clinical research in dermatology published in Spain and Latin America need to substantially improve both the design of their trials and the reporting of results.
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Affiliation(s)
- G Sanclemente
- Grupo de Investigación Dermatológica (GRID), Universidad de Antioquia, Medellín, Colombia.
| | - H Pardo
- Centro Cochrane Iberoamericano, Institut d'Investigació Biomèdica Sant Pau (IIB Sant Pau), Barcelona, España
| | - S Sánchez
- Grupo de Investigación Dermatológica (GRID), Universidad de Antioquia, Medellín, Colombia
| | - X Bonfill
- Centro Cochrane Iberoamericano, Institut d'Investigació Biomèdica Sant Pau (IIB Sant Pau), CIBER Epidemiología y Salud Pública (CIBERESP), Universitat Autònoma de Barcelona, Barcelona, España
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Sanclemente G, Pardo H, Sánchez S, Bonfill X. Identifying Randomized Clinical Trials in Spanish-Language Dermatology Journals. Actas Dermo-Sifiliográficas (English Edition) 2015. [DOI: 10.1016/j.adengl.2015.04.010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Bellmunt S, Roqué M, Osorio D, Pardo H, Escudero JR, Bonfill X. Healthcare Quality Indicators of Peripheral Artery Disease Based on Systematic Reviews. J Vasc Surg 2014. [DOI: 10.1016/j.jvs.2014.05.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Bellmunt S, Roqué M, Osorio D, Pardo H, Escudero JR, Bonfill X. Healthcare quality indicators of peripheral artery disease based on systematic reviews. Eur J Vasc Endovasc Surg 2014; 48:60-9. [PMID: 24650396 DOI: 10.1016/j.ejvs.2014.02.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2013] [Accepted: 02/01/2014] [Indexed: 11/17/2022]
Abstract
OBJECTIVES Peripheral artery disease (PAD) is a major health problem whose clinical management includes multiple options regarding risk factor control, diagnosis, and medical and surgical treatment. The aim was to generate indicators based on systematic reviews to evaluate the quality of healthcare provided in PAD. METHODS Electronic searches were run for systematic reviews in The Cochrane Library (Issue 6, 2011), MEDLINE, EMBASE, and other databases (up to June 2011). Conclusive systematic reviews of high methodological quality were selected to formulate clinical recommendations. Indicators were derived from clinical recommendations with moderate to very high strength of evidence as assessed by the GRADE system. RESULTS From 1,804 reviews initially identified, 29 conclusive and high-quality systematic reviews were selected and nine clinical recommendations were formulated with a moderate to very high strength of recommendation. Six indicators were finally generated: four on pharmacological interventions, antiplatelet agents, naftidrofuryl, cilostazol, and statins; and two lifestyle interventions, exercise and tobacco cessation. No indicators were derived for diagnostic tests or surgical techniques. Most indicators targeted patients with intermittent claudication. CONCLUSIONS These quality indicators will help clinicians to assess the appropriateness of healthcare provided in PAD. The development of evidence-based indicators in PAD is limited by the lack of methodological quality of the research in this disease, the inconclusiveness of the evidence on diagnostic and surgical techniques, and the dynamic nature of the vascular diseases field.
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Affiliation(s)
- S Bellmunt
- Vascular and Endovascular Surgery Department, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain; Biomedical Research Institute Sant Pau (IIB Sant Pau), Universitat Autònoma de Barcelona (UAB), Barcelona, Spain.
| | - M Roqué
- Biomedical Research Institute Sant Pau (IIB Sant Pau), Universitat Autònoma de Barcelona (UAB), Barcelona, Spain; Centro de Investigación Biomédica en Red de Epidemiología y Salud Pública (CIBERESP), Spain; Iberoamerican Cochrane Centre, Barcelona, Spain
| | - D Osorio
- Biomedical Research Institute Sant Pau (IIB Sant Pau), Universitat Autònoma de Barcelona (UAB), Barcelona, Spain; Clinical Epidemiology and Public Health Service, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain
| | - H Pardo
- Biomedical Research Institute Sant Pau (IIB Sant Pau), Universitat Autònoma de Barcelona (UAB), Barcelona, Spain; Iberoamerican Cochrane Centre, Barcelona, Spain
| | - J-R Escudero
- Vascular and Endovascular Surgery Department, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain; Biomedical Research Institute Sant Pau (IIB Sant Pau), Universitat Autònoma de Barcelona (UAB), Barcelona, Spain
| | - X Bonfill
- Biomedical Research Institute Sant Pau (IIB Sant Pau), Universitat Autònoma de Barcelona (UAB), Barcelona, Spain; Centro de Investigación Biomédica en Red de Epidemiología y Salud Pública (CIBERESP), Spain; Iberoamerican Cochrane Centre, Barcelona, Spain; Clinical Epidemiology and Public Health Service, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain
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Souza NS, Sergeenkov S, Rodrigues AD, Cardoso CA, Pardo H, Faccio R, Mombrú AW, Galzerani JC, De Lima OF, Araújo-Moreira FM. Stability Issues and Structure-Sensitive Magnetic Properties of Nanofluid Ferromagnetic Graphite. J Nanofluids 2012. [DOI: 10.1166/jon.2012.1022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Pejo C, Pardo H, Mombrú A, Cerdá M, Gancheff J, Chiozzone R, González R. Re(V) complexes formed by metal-assisted solvolysis of di-(2-pyridyl)ketone: Synthesis, X-ray studies, redox behavior and DFT calculations. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2011.06.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Sergeenkov S, Souza NS, Speglich C, Rivera VAG, Cardoso CA, Pardo H, Mombrú AW, Araújo-Moreira FM. Temperature oscillations of magnetization observed in nanofluid ferromagnetic graphite. J Phys Condens Matter 2009; 21:495303. [PMID: 21836191 DOI: 10.1088/0953-8984/21/49/495303] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We report on unusual magnetic properties observed for nanofluid room temperature ferromagnetic graphite (with an average particle size of [Formula: see text] nm). More precisely, the measured magnetization exhibits a low temperature anomaly (attributed to the manifestation of finite size effects below the quantum temperature [Formula: see text]) as well as pronounced temperature oscillations above T = 50 K (attributed to manifestation of the hard-sphere type of pair correlations between ferromagnetic particles in the nanofluid).
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Affiliation(s)
- S Sergeenkov
- Materials and Devices Group, Department of Physics and Physical Engineering, Universidade Federal de São Carlos, São Carlos, SP 13565-905, Brazil
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Torre MH, Calvo S, Pardo H, Mombru AW. Synthesis, spectroscopic characterization and crystal structure of disulfamethoxazole diaquo Ni(II) monohydrate. J COORD CHEM 2006. [DOI: 10.1080/00958970500037516] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- M. H. Torre
- a Cátedra de Química Inorgánica , DEC, Facultad de Química, UDELAR , Gral. Flores 2124, CC1157, Montevideo, Uruguay
| | - S. Calvo
- a Cátedra de Química Inorgánica , DEC, Facultad de Química, UDELAR , Gral. Flores 2124, CC1157, Montevideo, Uruguay
| | - H. Pardo
- b Laboratorio de Cristalografía , DEQUIFIM, Facultad de Química, UDELAR , Gral. Flores 2124, CC1157, Montevideo, Uruguay
| | - A. W. Mombru
- b Laboratorio de Cristalografía , DEQUIFIM, Facultad de Química, UDELAR , Gral. Flores 2124, CC1157, Montevideo, Uruguay
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Melnyk P, Jamardo B, Cacace M, Pardo H, Pino A, Tomasetti A, Martinez Cortizas M, Hurtado D, Braier M, Verretilne G. Considerations about teachers' dysphonias. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/s0531-5131(03)01030-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Suescun L, Mombrú AW, Mariezcurrena RA, Pardo H, Russi S, Kremer C, Rivero M, Kremer E. [1,3-Bis(diphenylphosphino)propane]trichlorooxorhenium(V). Acta Crystallogr C 2000; 56 ( Pt 8):930-1. [PMID: 10944276 DOI: 10.1107/s0108270100006983] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/1999] [Accepted: 05/10/2000] [Indexed: 11/10/2022] Open
Abstract
Trichlorooxo[1,3-propanediylbis(diphenylphosphine)-P,P ']rhenium(V), [ReCl(3)O(C(27)H(26)P(2))], crystallizes with four formula units per unit cell. The crystal structure consists of neutral complexes of [ReOCl(3)(dppp)] [dppp is 1,3-bis(diphenylphosphino)propane] packed by H.pi-ring interactions. The Re atom is octahedrally coordinated to the oxo anion, three Cl atoms and two P atoms from the dppp ligand. The six-membered ring formed by the bidentate dppp ligand and the rhenium metal centre is in a chair conformation. The title compound is an intermediate in the synthesis of bis(dppp) complexes of rhenium.
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Affiliation(s)
- L Suescun
- Laboratorio de Cristalografía y Química del Estado Sólido, Facultad de Química, Universidad de la República, Av. Gral Flores 2124, Casilla de Correos 1157, Montevideo, Uruguay
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Russi S, Suescun L, Mombrú AW, Pardo H, Mariezcurrena RA, Brovetto M, Seoane G. (1 S,2 S,5 S,6 S)-5,6-Dihydroxy-6-methylcyclohex-3-en-1,2-diyl diacetate. Acta Crystallogr C 1999. [DOI: 10.1107/s0108270199004953] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Mariezcurrena RA, Russi S, Mombrú AW, Suescun L, Pardo H, Tombesi OL, Frontera MA. Mixed stacking and stoichiometry in a π-molecular complex between fluorene and 1,3,5-trinitrobenzene. Acta Crystallogr C 1999. [DOI: 10.1107/s0108270199003662] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Janiszewski DJ, Galinkin JL, Klock PA, Coalson DW, Pardo H, Zacny JP. The effects of subanesthetic concentrations of sevoflurane and nitrous oxide, alone and in combination, on analgesia, mood, and psychomotor performance in healthy volunteers. Anesth Analg 1999; 88:1149-54. [PMID: 10320186 DOI: 10.1097/00000539-199905000-00034] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [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: 11/26/2022]
Abstract
UNLABELLED We studied the effects of subanesthetic concentrations of sevoflurane and nitrous oxide, alone and in combination, on analgesia, mood, and psychomotor performance in human volunteers. We hypothesized that nitrous oxide and sevoflurane would produce both opposing and potentiating effects within the same study. Over the course of three sessions, 20 subjects inhaled 0%, 0.2%, or 0.4% end-tidal sevoflurane for a 68-min period that was divided into four 17-min blocks. During either the second or fourth block, 30% end-tidal nitrous oxide was added to the concentration of sevoflurane being inhaled. Pain response, psychomotor performance, and mood were evaluated during the second and fourth blocks. Pain ratings were higher when sevoflurane and nitrous oxide were administered together than when nitrous oxide was administered alone, which indicates that sevoflurane attenuated the analgesic effects of nitrous oxide. Sevoflurane increased self-reported ratings of sleepiness, and the addition of nitrous oxide decreased these ratings. Nitrous oxide potentiated psychomotor impairment that was induced by sevoflurane. The combination of sevoflurane and nitrous oxide produced both opposing and potentiating effects within the same study. The results suggest that nitrous oxide and sevoflurane may act through different neurochemical mechanisms on some end points, such as analgesia and sleepiness. IMPLICATIONS Healthy volunteers inhaled subanesthetic concentrations of sevoflurane and nitrous oxide. Sevoflurane made nitrous oxide less effective as an analgesic, and nitrous oxide made sevoflurane less effective as a sedative. The two drugs may work at cross purposes on different end points of anesthesia.
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Affiliation(s)
- D J Janiszewski
- Department of Anesthesia and Critical Care, University of Chicago, Illinois 60637, USA
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Abstract
The structures of two absorption furosemide prodrugs, hexanoyloxymethyl 4-chloro-N-furfuryl-5-sulfamoyl-anthranilate (C19H23CIN2O7S), (I), and benzoyloxymethyl 4-chloro-N-furfuryl-5-sulfamoylanthranilate (C20H17CIN2O7S), (II), are described in this paper and compared with furosemide and four other prodrugs. The molecular conformations of both compounds are similar to those of the other prodrugs; the packing and the crystal system are the primary differences. Compound (I) crystallizes in the trigonal space group R3 and compound (II) in the monoclinic space group P2(1)/n. The packing of both structures is stabilized by a three-dimensional hydrogen-bond network.
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Affiliation(s)
- A W Mombrú
- Laboratorio de Cristalografía y Química del Estado Sólido, Facultad de Química, Universidad de la República, Montevideo, Uruguay
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Margozzini J, Ulloa D, Salinas S, Pardo H, Troncoso C, Zurita D, Villavicencio E, Gil L. [Use of information in evaluating team work in a peripheral outpatient clinic]. Rev Chil Pediatr 1979; 50:83-93. [PMID: 119984] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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