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1.
Animals (Basel) ; 14(6)2024 Mar 17.
Artigo em Inglês | MEDLINE | ID: mdl-38540027

RESUMO

Our objective was to assess the pharmacokinetic characteristics of metamizole when administered together with tramadol in a single intravenous dose to donkeys. Ten male animals received 10 mg∙kg-1 of dipyrone associated with 2 mg∙kg-1 of tramadol (T2M10) and 25 mg∙kg-1 of dipyrone with 2 mg∙kg-1 of tramadol (T2M25). Venous blood samples were taken from groups to determine the pharmacokinetics after drug administration, using initial brief intervals that were followed by extended periods until 48 h. Restlessness and ataxia were observed in two animals in the T2M25 group. Analysis revealed prolonged detectability of tramadol, 4-methylamine antipyrine, 4-aminoantipyrine (up to 24 h), and O-desmethyltramadol (up to 12 h) after administration. Although metamizole and its metabolites showed no significant pharmacokinetic changes, tramadol and O-desmethyltramadol exhibited altered profiles, likely because of competition for the active sites of CYP450 enzymes. Importantly, the co-administration of metamizole increased the bioavailability of tramadol and O-desmethyltramadol in a dose-dependent manner, highlighting their potential interactions and emphasizing the need for further dose optimization in donkey analgesic therapies. In conclusion, metamizole co-administered with tramadol interferes with metabolism and this interference can change the frequency of drug administration and its analgesic efficacy.

2.
J Vet Pharmacol Ther ; 44(3): 318-325, 2021 May.
Artigo em Inglês | MEDLINE | ID: mdl-33280136

RESUMO

There is currently little information available on the pharmacokinetics and pharmacodynamics of the analgesic opioid tramadol when used in the veterinary medicine of domestic species. In this study, we aimed to determine the pharmacokinetics of tramadol and its active metabolite M1 following intravenous administration of 2 (T2) and 4 (T4) mg/kg to Northeast Brazilian donkeys. Tramadol and M1 plasma levels were quantified using a validated liquid chromatography-tandem mass spectrometry method. We found that plasma levels of tramadol and M1 were higher than those reported as clinically meaningful in humans for at least 3 hr. However, the pharmacokinetic parameter calculation corrected by dose analysis identified no proportional increase with dose for the AUC of tramadol (T2: 2,663 ± 1,827 vs. T4: 2,964 ± 1,038 ng*h/ml) and M1 (T2: 378 ± 237 vs. T4: 345 ± 142 ng*h/ml). This finding appears to be attributable to a significant increase in clearance and a reduction in the terminal half-life of tramadol. The frequency of adverse effects observed at the higher dose indicates that 2 mg/kg administered intravenously would be suitable for donkeys. Clinical studies are required to determine the implications of these observations regarding the pharmacodynamic response to tramadol in Northeast Brazilian donkeys.


Assuntos
Tramadol , Administração Intravenosa/veterinária , Analgésicos Opioides , Animais , Cromatografia Líquida/veterinária , Equidae
3.
Rev Chilena Infectol ; 37(1): 37-44, 2020 Feb.
Artigo em Espanhol | MEDLINE | ID: mdl-32730398

RESUMO

BACKGROUND: Staphylococcus aureus is one of most prevalent pathogens in the world associated with a high mortality rate and a rapid development of resistance to antibiotics. Despite its pathogenicity, epidemiological monitoring in Mexico is scarce. AIM: To analyze the local molecular epidemiology and determine the clonal origin of methicillin-resistant (MR) strains isolated from patients admitted to Hospital "Dr. Ignacio Morones Prieto". METHODS: A cross-sectional prospective study was carried out from July to December 2016. The characterization of the strains was carried out by Spa genotyping, frequency of specific virulence genes by PCR and antibiogram. RESULTS: The prevalence of MRSA was 25.7%, highlighting the presence of the Spa type t895 in 76% of the resistant strains and a similar pattern of susceptibility to antibiotics. CONCLUSION: The results of this study indicate that the regional prevalence of MRSA has not changed in the last 10 years and provide valuable information on the clonal origin and the virulence factors of the strains of S. aureus isolated in the region.


Assuntos
Staphylococcus aureus Resistente à Meticilina , Infecções Estafilocócicas , Antibacterianos/farmacologia , Estudos Transversais , Genótipo , Humanos , Staphylococcus aureus Resistente à Meticilina/classificação , Staphylococcus aureus Resistente à Meticilina/efeitos dos fármacos , Staphylococcus aureus Resistente à Meticilina/genética , México/epidemiologia , Testes de Sensibilidade Microbiana , Prevalência , Estudos Prospectivos , Infecções Estafilocócicas/epidemiologia , Infecções Estafilocócicas/microbiologia , Fatores de Virulência/genética
4.
Arch Med Res ; 51(3): 268-277, 2020 04.
Artigo em Inglês | MEDLINE | ID: mdl-32143939

RESUMO

BACKGROUND: There is evidence that the pharmacokinetics of certain drugs in Mexicans may differ with respect to other ethnic groups. On the other hand, there is controversy about the existence of interethnic variability in the pharmacokinetics of ciprofloxacin. AIM OF THE STUDY: To study oral ciprofloxacin pharmacokinetics in Mexicans at various dose levels and make comparisons with other populations in order to gain insight on interethnic variability. METHODS: Healthy Mexican volunteers received oral ciprofloxacin as 250 mg and 500 mg immediate-release tablets or a 1,000 mg extended-release formulation. Plasma concentration against time curves were constructed, and pharmacokinetic parameters were compared with those reported for other populations. RESULTS: Ciprofloxacin pharmacokinetics in Mexicans was linear and no significant differences between males and females were detected. When several populations were compared, it appeared that bioavailability in Mexicans was similar to that of Caucasians, being lower than that of Asians. These variations were attenuated when data were normalized by body weight. CONCLUSIONS: Ciprofloxacin pharmacokinetics exhibit interethnic variability, Asians exhibiting an increased bioavailability with regard to Mexicans and Caucasians. Data suggest that these differences are due to body weight.


Assuntos
Ciprofloxacina/sangue , Ciprofloxacina/farmacocinética , Voluntários Saudáveis/estatística & dados numéricos , Administração Oral , Adulto , Povo Asiático , Disponibilidade Biológica , Peso Corporal/fisiologia , Etnicidade , Feminino , Humanos , Masculino , México , População Branca , Adulto Jovem
5.
Rev. chil. infectol ; Rev. chil. infectol;37(1): 37-44, feb. 2020. tab, graf
Artigo em Espanhol | LILACS | ID: biblio-1092720

RESUMO

Resumen Introducción: Staphylococcus aureus es uno de los patógenos con mayor prevalencia en el mundo, asociado a una alta tasa de mortalidad y un rápido desarrollo de resistencia a los antimicrobianos. A pesar de su patogenicidad, su seguimiento epidemiológico en México es escaso. Objetivo: Analizar la epidemiología molecular local y determinar el origen clonal de cepas resistentes a meticilina (RM) aisladas de pacientes internados en el Hospital Central "Dr. Ignacio Morones Prieto". Métodos: Se llevó a cabo un estudio prospectivo de corte transversal, de julio a diciembre de 2016. La caracterización de las cepas se realizó mediante genotipificación Spa, la determinación por RPC punto final de la frecuencia de genes de virulencia específicos y su antibiograma. Resultados: A partir de estos datos, se obtuvo que la prevalencia de S. aureus RM fue de 25,7%, destacando la presencia del tipo Spa t895 en 76% de las cepas resistentes y un patrón similar de susceptibilidad a antimicrobianos. Conclusión: Los resultados de este estudio indican que la prevalencia regional de SARM no se ha modificado en los últimos 10 años y proporcionan información valiosa del origen clonal y los factores de virulencia de las cepas de S. aureus aisladas en la región.


Abstract Background: Staphylococcus aureus is one of most prevalent pathogens in the world associated with a high mortality rate and a rapid development of resistance to antibiotics. Despite its pathogenicity, epidemiological monitoring in Mexico is scarce. Aim: To analyze the local molecular epidemiology and determine the clonal origin of methicillin-resistant (MR) strains isolated from patients admitted to Hospital "Dr. Ignacio Morones Prieto". Methods: A cross-sectional prospective study was carried out from July to December 2016. The characterization of the strains was carried out by Spa genotyping, frequency of specific virulence genes by PCR and antibiogram. Results: The prevalence of MRSA was 25.7%, highlighting the presence of the Spa type t895 in 76% of the resistant strains and a similar pattern of susceptibility to antibiotics. Conclusion: The results of this study indicate that the regional prevalence of MRSA has not changed in the last 10 years and provide valuable information on the clonal origin and the virulence factors of the strains of S. aureus isolated in the region.


Assuntos
Humanos , Infecções Estafilocócicas/microbiologia , Infecções Estafilocócicas/epidemiologia , Staphylococcus aureus Resistente à Meticilina/classificação , Staphylococcus aureus Resistente à Meticilina/efeitos dos fármacos , Staphylococcus aureus Resistente à Meticilina/genética , Testes de Sensibilidade Microbiana , Prevalência , Estudos Transversais , Estudos Prospectivos , Fatores de Virulência/genética , Genótipo , México/epidemiologia , Antibacterianos/farmacologia
6.
Drug Deliv Transl Res ; 10(5): 1393-1402, 2020 10.
Artigo em Inglês | MEDLINE | ID: mdl-31942699

RESUMO

A thermo-reversible in situ forming implant, based on the combination of Pluronic® F-127 and Pluronic® F-68 with nanostructured lipid carriers (NLC), was formulated with the aim of achieving the sustained release of estradiol valerate (EV). EV-loaded NLC, prepared by the hot high-pressure homogenization technique, presented an entrapment efficiency of 90 ± 2.9 %, a particle size (PS) of 122 ± 11.2 nm, a polydispersity index (PDI) of 0.344 ± 0.07, and a zeta potential (ZP) of - 10.5 ± 1.3 mV. Once obtained, NLC were then included in a thermo-reversible gel (EV-loaded NLC gel), which was characterized by its rheological behavior, gelation temperature, and injectability. The in vitro release tests showed that the EV-loaded NLC gel delayed the release significantly, in comparison with a solution of the drug and with the EV-loaded NLC. The EV-loaded NLC gel and a commercially available suspension containing estradiol were administered parenterally to rabbits. A 16.8-fold greater AUC and a 40-fold higher Cmax were obtained with the EV-loaded NLC gel, compared to the commercial suspension. A rapid initial release of EV in vivo, from the EV-loaded NLC gel, suggests that it is necessary to adjust the ratio of the copolymers or to include in the gel an additive that improves gelation time and gel strength, in order to achieve a sustained release. An interesting observation was that the in vitro profile, which has a three-phase behavior, coincides with what was observed in the in vivo study. Graphical abstract.


Assuntos
Portadores de Fármacos , Estradiol/administração & dosagem , Lipídeos , Nanoestruturas , Animais , Tamanho da Partícula , Coelhos
7.
Drug Dev Res ; 77(4): 180-6, 2016 06.
Artigo em Inglês | MEDLINE | ID: mdl-27149602

RESUMO

Preclinical Research The aim of the present study was to evaluate the antinociceptive and sedative activity of an ethanol extract of Justicia spicigera an evergreen used in Mexican traditional medicine for the relief of pain, wounds, fever and inflammation. At 200 mg/kg po, the maximum dose examined, the ethanol extract of J. spicigera (JSE) had analgesic activity in mice in the acetic acid writhing test, the second phase of the formalin test and the tail flick test that was similar in efficacy to the NSAID, naproxen (150 mg/kg po). JSE was inactive in the hot plate test and and the ketamine-induced sleeping time test; it had no sedative effects. These results show that the ethanol extract from the leaves of J. spicigera has antinociceptive effects in mice without inducing sedation. Drug Dev Res 77 : 180-186, 2016. © 2016 Wiley Periodicals, Inc.


Assuntos
Analgésicos/farmacologia , Justicia/química , Dor/tratamento farmacológico , Extratos Vegetais/farmacologia , Analgésicos/isolamento & purificação , Analgésicos/toxicidade , Animais , Anti-Inflamatórios não Esteroides/farmacologia , Modelos Animais de Doenças , Etanol/química , Masculino , Medicina Tradicional , Camundongos , Camundongos Endogâmicos BALB C , Naproxeno/farmacologia , Extratos Vegetais/toxicidade , Folhas de Planta , Fases do Sono/efeitos dos fármacos
8.
Rev Invest Clin ; 67(4): 250-7, 2015.
Artigo em Inglês | MEDLINE | ID: mdl-26426591

RESUMO

BACKGROUND: Cyclooxygenase-2 selective inhibitors have been developed to alleviate pain and inflammation; however, the use of a selective cyclooxygenase-2 inhibitor is associated with mild edema, hypertension, and cardiovascular risk. AIM: To evaluate, in an experimental model in normotensive rats, the effect of treatment with parecoxib in comparison with diclofenac and aspirin and L-NAME, a non-selective nitric oxide synthetase, on mean arterial blood pressure, and cyclooxygenase-1 and -2 messenger RNA and protein expression in aortic tissue. METHODS: Rats were treated for seven days with parecoxib (10 mg/kg/day), diclofenac (3.2 mg/kg/day), aspirin (10 mg/kg/day), or L-NAME (10 mg/kg/day). Mean arterial blood pressure was evaluated in rat tail; cyclooxygenase-1 and -2 were evaluated by reverse transcription-polymerase chain reaction and Western blot analysis in aortic tissue. RESULTS: Parecoxib and L-NAME, but not aspirin and diclofenac, increased mean arterial blood pressure by about 50% (p < 0.05) without changes in cardiac frequency. Messenger RNA cyclooxygenase-1 expression in aortic tissue was not modified with any drug (p < 0.05). L-NAME and parecoxib treatment decreased messenger RNA cyclooxygenase-2 and cyclooxygenase-2 (p < 0.05). While cyclooxygenase-1 protein decreased with the three drugs tested but not with L-NAME (p < 0.05), the cyclooxygenase-2 protein decreased only with aspirin and parecoxib (p < 0.05). CONCLUSION: Parecoxib increases the blood pressure of normotensive rats by the suppression of COX-2 gene expression, which apparently induced cardiovascular control.


Assuntos
Pressão Sanguínea/efeitos dos fármacos , Inibidores de Ciclo-Oxigenase 2/toxicidade , Ciclo-Oxigenase 2/efeitos dos fármacos , Isoxazóis/toxicidade , Animais , Aorta/efeitos dos fármacos , Aorta/metabolismo , Aspirina/toxicidade , Western Blotting , Ciclo-Oxigenase 1/genética , Ciclo-Oxigenase 2/genética , Diclofenaco/toxicidade , Regulação Enzimológica da Expressão Gênica/efeitos dos fármacos , Masculino , NG-Nitroarginina Metil Éster/toxicidade , RNA Mensageiro/metabolismo , Ratos , Ratos Endogâmicos WKY , Reação em Cadeia da Polimerase Via Transcriptase Reversa
10.
Micron ; 78: 33-39, 2015 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-26218801

RESUMO

AIM: To determinate the significance of risk factors with the presence of biofilm on catheters of patients attended at tertiary hospital cares. MATERIAL AND METHODS: A total of 126 patients were included, data collection by observing the handling of the CVC, clinical history and microbiological isolation methods of CVCs tips (Roll-plate, sonication and scanning electron microscopy) were evaluated. RESULTS: Certain factors, such as the lack of proper hand washing, the use of primary barriers and preparing medications in the same hospital service, showed an important relationship between biofilm formation in CVCs. The sonication method presented that most of the samples had isolation of multispecies 29 samples (64%); in contrast with the roll-plate method, just one sample (3%) was isolated. CONCLUSIONS: The importance of the strict aseptic techniques of insertion and of the handlings of CVC was highlighted, the failure of both techniques was related to the biofilm formation and was evidenced using the scanning electron microscopy. Since this tool is not available in most hospitals, we present the correlation of those evidences with other standard microbiological methods and risk factors, which are necessary for the sensible detection of the different steps of the biofilm formation on CVC and their correct interpretation with clinical evidences.


Assuntos
Biofilmes , Cateteres Venosos Centrais/microbiologia , Centros de Atenção Terciária , Biofilmes/crescimento & desenvolvimento , Feminino , Humanos , Masculino , Técnicas Microbiológicas , Microscopia Eletrônica de Varredura , Pessoa de Meia-Idade , Estudos Prospectivos , Fatores de Risco , Sonicação
11.
Gac Med Mex ; 151(3): 377-86, 2015.
Artigo em Espanhol | MEDLINE | ID: mdl-26089274

RESUMO

A drug that contains a recombinant protein as an active principle is called a biotechnological drug or biopharmaceutical.There are currently over 300 biopharmaceuticals worldwide. Many of these contains a similar active principle (biosimilar drug) as other previously registered (innovator drug). It has suggested that due to the complex implications in a formulation containing a protein, the manufacturing process is a key factor for efficacy and safety requirements. In fact, certain variability has been detected of the protein properties in different lots (or batches) of the same manufacturer, which produce changes at a clinical level. For this reason, the evaluation of biosimilar drugs has acquired great relevance, being the preclinical level of one of the more important stages of the development due to its lower cost (with respect to the clinical level) and its high capacity to detect formulation-manufacture problems. However, the demonstration of comparability at physicochemical, preclinical, and clinical levels is required in order to achieve market registration. In this review the in vitro and in vivo models used for the assessment of proposed biosimilars will be discussed.


Assuntos
Medicamentos Biossimilares/farmacologia , Modelos Biológicos , Animais , Avaliação Pré-Clínica de Medicamentos , Humanos , Técnicas In Vitro
12.
J Chromatogr Sci ; 53(8): 1373-8, 2015 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-25862744

RESUMO

A high-throughput ultra-performance liquid chromatography coupled to tandem mass spectrometry (LC-ESI-MS-MS) method was developed for the determination of pinaverium bromide in human plasma. Protein precipitation with acetonitrile was used to extract pinaverium and itraconazole (as internal standard) from 500 µL plasma samples. The chromatographic separation was achieved with an Acquity UPLC BEH C18 column (1.7 µm, 2.1 × 100 mm) using a mixture of acetonitrile-5 mM ammonium formate (80:20, v/v) as mobile phase. Isocratic elution at 0.3 mL/min was used. Detection was performed by positive ion electrospray tandem mass spectrometry on a XEVO TQ-S by multiple reaction monitoring mode. The mass transitions monitorized were as follows: m/z 511.2 → 230 for pinaverium bromide, and m/z 705.29 → 392.18 for the itraconazole. The method was validated over a concentration range of 12-12,000 pg/mL. The chromatographic method runtime is 2.5 min and was applied to characterize the pharmacokinetics of pinaverium bromide after the oral administration of 100 mg to healthy Mexican subjects.


Assuntos
Cromatografia Líquida de Alta Pressão/métodos , Morfolinas/sangue , Morfolinas/farmacocinética , Espectrometria de Massas em Tandem/métodos , Administração Oral , Adolescente , Adulto , Estabilidade de Medicamentos , Feminino , Hispânico ou Latino , Humanos , Modelos Lineares , Masculino , Morfolinas/administração & dosagem , Morfolinas/química , Reprodutibilidade dos Testes , Sensibilidade e Especificidade , Adulto Jovem
13.
Front Pharmacol ; 6: 4, 2015.
Artigo em Inglês | MEDLINE | ID: mdl-25688207

RESUMO

Several clinical trials have substantiated the efficacy of the co-administration of statins like atorvastatin (ATO) and fibrates. Without information currently available about the interaction between the two drugs, a pharmacokinetic study was conducted to investigate the effect when both drugs were co-administered. The purpose of this study was to investigate the pharmacokinetic profile of tablets containing ATO 20 mg, or the combination of ATO 20 mg with fenofibrate (FNO) 160 mg administered to healthy Mexican volunteers. This was a randomized, two-period, two-sequence, crossover study; 36 eligible subjects aged between 20-50 years were included. Blood samples were collected up to 96 h after dosing, and pharmacokinetic parameters were obtained by non-compartmental analysis. Adverse events were evaluated based on subject interviews and physical examinations. Area under the concentration-time curve (AUC) and maximum plasma drug concentration (Cmax) were measured for ATO as the reference and ATO and FNO as the test product for bioequivalence design. The estimation computed (90% confidence intervals) for ATO and FNO combination versus ATO for Cmax, AUC0-t and AUC0-∞, were 102,09, 125,95, and 120,97%, respectively. These results suggest that ATO and FNO have no relevant clinical-pharmacokinetic drug interaction.

14.
Drug Dev Res ; 75(7): 449-54, 2014 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-24975999

RESUMO

Systemic coadministration of tramadol and dexketoprofen can produce antinociceptive synergism in animals. There has been only limited evaluation of this drug combination in the peripheral nervous system in terms of the antinociceptive interaction and its mechanisms. The aim of the present study was to evaluate the peripheral antinociceptive interaction between tramadol and dexketoprofen in the formalin test and the involvement of the nitric oxide (NO)-cyclic guanosine monophosphate pathway and ATP-sensitive K(+) channels. Different doses of tramadol or dexketoprofen were administered locally to the formalin-injured mouse paw and the antinociceptive effect evaluated. ED50 values were calculated for both drugs alone and in combination. Coadministration of tramadol and dexketoprofen produced an antinociceptive synergistic interaction during the second phase of the formalin test. Pretreatment with NO antagonists, including l-NG-nitroarginine methyl ester and 1H-[1,2,4]-oxadiazolo-[4,3-a]-quinoxalin-1-one, or the ATP-sensitive K(+) channel antagonist glibenclamide reversed the antinociceptive synergistic effect of the tramadol-dexketoprofen combination, suggesting that NO and ATP-sensitive K(+) channels were involved.


Assuntos
Analgésicos/farmacologia , Canais KATP/metabolismo , Cetoprofeno/análogos & derivados , Óxido Nítrico/metabolismo , Medição da Dor/efeitos dos fármacos , Tramadol/farmacologia , Trometamina/farmacologia , Animais , Relação Dose-Resposta a Droga , Sinergismo Farmacológico , Glibureto/farmacologia , Canais KATP/antagonistas & inibidores , Cetoprofeno/antagonistas & inibidores , Cetoprofeno/farmacologia , Masculino , Camundongos , NG-Nitroarginina Metil Éster/farmacologia , Óxido Nítrico/antagonistas & inibidores , Oxidiazóis/farmacologia , Quinoxalinas/farmacologia , Tramadol/antagonistas & inibidores , Trometamina/antagonistas & inibidores
15.
In Vitro Cell Dev Biol Anim ; 47(10): 681-8, 2011 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-22012415

RESUMO

A new system for sustained release of growth factors, such as osteogenic protein 1 (OP-1) and transforming growth factor ß1 (TGF-ß1), intended to repair and promote dental tissue regeneration in rats was designed and characterized in this work. The release system was made with microparticles of sodium alginate, produced by ionic gelling dripping technique. The release profiles of OP-1 and TGF-ß1 from biopolymer matrix were determined by high-performance liquid chromatography (HPLC), and with this purpose, an HPLC-UV method was developed. About 80% of each growth factor was released in the first 24 h, reaching almost 100% in 168 h. The system was tested during the tissue repair in rat molars in comparison with calcium hydroxide and both growth factors not encapsulated. The dentin sialoprotein (DSP) was used as a repair marker. It was detected by immunohistochemistry, after 14- and 28-d post-treatment. X (2) test (p ≤ 0.001) and Fisher exact test (p ≤ 0.05) were applied for assessment of the amount of immunostaining. The treatment with encapsulated OP-1 showed an increased DSP immunostaining after 14 d and did not find any significant difference with the immunostaining observed for calcium hydroxide treatment. Treatment with TGF-ß1 did not show significant difference with calcium hydroxide. Treatment with both factors OP-1 and TGF-ß1 showed higher DSP immunostaining in comparison with calcium hydroxide treatment. In conclusion, the combination of both growth factors encapsulated showed more DSP immunostaining in comparison with each one separated, either encapsulated or not.


Assuntos
Alginatos/química , Proteína Morfogenética Óssea 7/metabolismo , Micropartículas Derivadas de Células/química , Cromatografia Líquida de Alta Pressão/métodos , Microesferas , Fator de Crescimento Transformador beta1/metabolismo , Raios Ultravioleta , Animais , Proteína Morfogenética Óssea 7/farmacologia , Micropartículas Derivadas de Células/ultraestrutura , Preparações de Ação Retardada , Polpa Dentária/efeitos dos fármacos , Proteínas da Matriz Extracelular/metabolismo , Ácido Glucurônico/química , Ácidos Hexurônicos/química , Fosfoproteínas/metabolismo , Ratos , Ratos Wistar , Sialoglicoproteínas/metabolismo , Fator de Crescimento Transformador beta1/farmacologia
16.
Can J Physiol Pharmacol ; 85(5): 502-6, 2007 May.
Artigo em Inglês | MEDLINE | ID: mdl-17632584

RESUMO

Components of whole blood and plasma are highly altered during the presentation of nephrotic syndrome. The present study was aimed to explore the influence of nephrotic syndrome on the pharmacokinetics of cyclosporine (CsA) (10 mg/kg) administered i.v. to control or puromycin-induced nephrotic rats (P-NS). We found an increase in CsA bioavailability in the nephrotic group compared with controls. The area under the curve of blood CsA versus time (AUCiv) increased from 27.7 +/- 5.3 to 60.6 +/- 13.8 mug.h.mL-1 in control and P-NS rats, respectively. The AUCiv augmentation was positively correlated with cholesterol levels. On the other hand, the total body clearance was significantly lower (0.38 +/- 0.06 vs. 0.17 +/- 0.03 L.(kg body mass)-1.h-1) and the volume of distribution at steady state (3.70 +/- 0.52 vs. 2.85 +/- 0.32 L/kg) was significantly smaller in nephrotic rats as compared with control. These pharmacokinetic changes lead to a longer terminal half-life of CsA in P-NS rats (11.8 +/- 1.6 vs. 6.9 +/- 0.91 h). We conclude that the physiopathologic changes induced by the nephrotic syndrome in P-NS animals result in a significant increase in CsA blood exposure by both the decrease in drug distribution and the reduction in elimination rate of CsA.


Assuntos
Ciclosporina/farmacocinética , Síndrome Nefrótica/metabolismo , Animais , Área Sob a Curva , Disponibilidade Biológica , Colesterol/sangue , Ciclosporina/administração & dosagem , Ciclosporina/sangue , Modelos Animais de Doenças , Meia-Vida , Hipercolesterolemia/induzido quimicamente , Hipercolesterolemia/metabolismo , Hipertrigliceridemia/induzido quimicamente , Hipertrigliceridemia/metabolismo , Hipoalbuminemia/induzido quimicamente , Hipoalbuminemia/metabolismo , Imunossupressores/administração & dosagem , Imunossupressores/sangue , Imunossupressores/farmacocinética , Injeções Subcutâneas , Masculino , Taxa de Depuração Metabólica , Síndrome Nefrótica/induzido quimicamente , Puromicina Aminonucleosídeo/administração & dosagem , Puromicina Aminonucleosídeo/toxicidade , Ratos , Ratos Wistar
17.
J Oral Maxillofac Surg ; 65(7): 1315-20, 2007 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-17577495

RESUMO

PURPOSE: We compared the efficacy of tramadol given before or immediately after surgical extraction of an impacted mandibular third molar under local anesthesia. MATERIALS AND METHODS: In this prospective, randomized, controlled, double-blind pilot study, 3 groups of 20 patients each were included: tramadol preoperative, 100 mg intramuscularly (IM) 1 hour before surgery (group A); tramadol postoperative, 100 mg IM immediately after surgery (group B); and saline (group C). We evaluated intensity of pain and analgesic consumption as was requested. RESULTS: The analgesic efficacy measured as complete relief of pain at 24 hours was 86% in the preemptive tramadol compared with 70% and 36% for postoperative tramadol administration and control group. A significant reduction in the consumption of analgesics was seen in preoperative group as compared with the postoperative and control groups. Adverse events were minimal and similar in all groups. CONCLUSIONS: This study suggests the preemptive use of tramadol as an alternative for the acute pain treatment after the removal of an impacted mandibular third molar carried out under local anesthesia.


Assuntos
Analgésicos Opioides/administração & dosagem , Dente Serotino/cirurgia , Dor Pós-Operatória/prevenção & controle , Extração Dentária/métodos , Tramadol/administração & dosagem , Adulto , Método Duplo-Cego , Feminino , Humanos , Injeções Intramusculares , Masculino , Mandíbula , Medição da Dor , Projetos Piloto , Cuidados Pós-Operatórios , Medicação Pré-Anestésica , Estatísticas não Paramétricas , Dente Impactado/cirurgia
18.
Pediatr Nephrol ; 22(1): 84-90, 2007 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-17053886

RESUMO

In this paper, we report the pharmacokinetics changes observed in seven children with steroid-resistant nephrotic syndrome (SRNS). They received cyclosporine A (CsA) microemulsion 6 mg/kg/day and, one week later, they were admitted to perform a 12-h pharmacokinetic profile with eight time sample points. The pharmacokinetic profile was repeated at 24 weeks of treatment, when all patients achieved remission. Blood concentration against time curves were constructed for each patient at weeks 1 and 24 of CsA treatment. Peak concentrations (C (max)) and the time needed to reach peak concentrations (t (max)) were directly determined from these plots. The area under the curve (AUC) was estimated by the trapezoidal rule. There was a statistically significant difference of the AUC, trough levels, and t (max) between weeks 1 and 24, with a decrease of AUC from 5,211 ng*h/ml in week 1 to 3,289 ng*h/ml in week 24, the trough levels decreased from 157 ng/ml to 96 ng/ml, and the t (max) decreased from 1.85 h to 1.00 h. The higher CsA bioavailability during the nephrotic state has to be considered when managing patients, since the target AUC cannot be the same throughout the treatment.


Assuntos
Ciclosporina/farmacocinética , Imunossupressores/farmacocinética , Síndrome Nefrótica/tratamento farmacológico , Adolescente , Área Sob a Curva , Disponibilidade Biológica , Criança , Pré-Escolar , Ciclosporina/sangue , Resistência a Medicamentos , Feminino , Humanos , Imunossupressores/sangue , Lactente , Masculino , Síndrome Nefrótica/sangue , Estudos Prospectivos , Indução de Remissão , Esteroides/uso terapêutico
19.
Environ Health Perspect ; 113(6): 782-6, 2005 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-15929904

RESUMO

We reported previously that children are exposed to deltamethrin in malarious areas. In the present work we explored the levels of this insecticide in soil samples and also obtained relevant toxicokinetic data of deltamethrin in exposed children. Results show that, after spraying, indoor levels of deltamethrin in soil samples were higher than outdoor levels. The mean half-life estimated with these data was 15.5 days for outdoor samples and 15.4 days for indoor samples. Children's exposure to deltamethrin was assessed using as biomarkers the urinary concentrations of the metabolites 3-phenoxybenzoic acid (3-PBA) and cis-3-(2,2-dibromovinyl)-2,2-dimethylcyclopropane-1-carboxylic acid (Br2CA). The mean level of both biomarkers reached a peak within the first 24 hr postexposure; 6 months after the initial exposure, urinary levels of 3-PBA and Br2CA were found at levels observed before exposure. Approximately 91% of the total 3-PBA or Br2CA was excreted during the first 3 days after exposure. Therefore, we estimated a half-life for this period, the values for 3-PBA and Br2CA being almost identical (13.5 vs. 14.5 hr). Finally, considering reports about the genotoxicity of deltamethrin, we assessed DNA damage in children before and 24 hr after indoor spraying of deltamethrin; we found no differences in the comet assay end points. In conclusion, we observed exposure to deltamethrin in children, but we did not find any relationship between soil concentrations of deltamethrin and urinary levels of the metabolites. At least for genotoxicity, the exposed children appeared not to be at risk.


Assuntos
Benzoatos/urina , Inseticidas/análise , Controle de Mosquitos , Nitrilas/análise , Piretrinas/análise , Piretrinas/urina , Poluentes do Solo/análise , Criança , Pré-Escolar , Ensaio Cometa , Dano ao DNA , Monitoramento Ambiental , Feminino , Humanos , Masculino
20.
Rev Invest Clin ; 57(1): 38-48, 2005.
Artigo em Espanhol | MEDLINE | ID: mdl-15981957

RESUMO

The aim of the present study was to determinate the factors affecting carbamazepine (CBZ) clearance (CL) in adults with epilepsy using a mixed-effect model and sparse data collected during routine clinical care. The patient population comprised 104 adults receiving CBZ. A total of 161 CBZ steady state serum concentration samples were analyzed. Population CL was calculated by using NONMEM with a one compartment model with first-order absorption and elimination. The following covariates were tested for their influence on clearance (CL): total body weight, age, dose/day, sex, surface area (SA) and comedication with primidone (PRIM), ualproic acid or phenytoin (DFH). The final regression model for carbamazepine clearance found best to describe the data was: CL = (0.614 SA + 0.0016 dose/day)(1 + 0.278 DFH)(1 + 0.326 PRIM).


Assuntos
Carbamazepina/farmacocinética , Epilepsia/metabolismo , Adolescente , Adulto , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos
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