Consulta: creatorFacets:"Martins,M.A."
Registros recuperados: 9
Data/hora: 03/06/2024 05:16:07

Effect of asthma severity on symptom perception in childhood asthma
Provedor de dados: Brazilian Journal of Medical and Biological Research
Autores: Cabral,A.L.B.; Conceição,G.M.; Saldiva,P.H.N.; Martins,M.A.
Individual ability to perceive airway obstruction varies substantially. The factors influencing the perception of asthma are probably numerous and not well established in children. The present study was designed to examine the influence of asthma severity, use of preventive medication, age and gender on the association between respiratory symptoms (RS) and peak expiratory flow (PEF) rates in asthmatic children. We followed 92 asthmatic children, aged 6 to 16 years, for five months. Symptom scores were recorded daily and PEF was measured twice a day. The correlations among variables at the within-person level over time were analyzed for each child and for the pooled data by multivariate analysis. After pooling the data, there was a significant (P&lt;0.05)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Asthma; Asthma severity; Pulmonary function tests; Symptom perception; Childhood asthma.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2002000300006

Short-term exposure of mice to cigarette smoke and/or residual oil fly ash produces proximal airspace enlargements and airway epithelium remodeling
Provedor de dados: Brazilian Journal of Medical and Biological Research
Autores: Biselli,P.J.C.; Lopes,F.D.T.Q.S.; Moriya,H.T.; Rivero,D.H.R.F.; Toledo,A.C.; Saldiva,P.H.N.; Mauad,T.; Martins,M.A.
Chronic obstructive pulmonary disease (COPD) is associated with inflammatory cell reactions, tissue destruction and lung remodeling. Many signaling pathways for these phenomena are still to be identified. We developed a mouse model of COPD to evaluate some pathophysiological mechanisms acting during the initial stage of the disease. Forty-seven 6- to 8-week-old female C57/BL6 mice (approximately 22 g) were exposed for 2 months to cigarette smoke and/or residual oil fly ash (ROFA), a concentrate of air pollution. We measured lung mechanics, airspace enlargement, airway wall thickness, epithelial cell profile, elastic and collagen fiber deposition, and by immunohistochemistry transforming growth factor-β1 (TGF-β1), macrophage elastase (MMP12), neutrophils...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Emphysema; Cigarette smoke; Airways; TGF-β1; Mouse airway epithelium remodeling; Proximal airspace enlargements.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2011000500012

Patient and physician evaluation of the severity of acute asthma exacerbations
Provedor de dados: Brazilian Journal of Medical and Biological Research
Autores: Atta,J.A.; Nunes,M.P.T.; Fonseca-Guedes,C.H.F.; Avena,L.A.; Borgiani,M.T.; Fiorenza,R.F.; Martins,M.A.
We studied the ability of patients not experienced in the use of peak expiratory flow meters to assess the severity of their asthma exacerbations and compared it to the assessment of experienced clinicians. We also evaluated which data of physical examination and medical history are used by physicians to subjectively evaluate the severity of asthma attacks. Fifty-seven adult patients (15 men and 42 women, with a mean (± SD) age of 37.3 ± 14.5 years and 24.0 ± 17.9 years of asthma symptoms) with asthma exacerbations were evaluated in a University Hospital Emergency Department. Patients and physicians independently evaluated the severity of the asthma attack using a linear scale. Patient score, physician score and forced expiratory volume at the first second...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Asthma; Asthma attack; Pulmonary function tests; Dyspnea.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2004000900006

Effects of exercise training on atrophy gene expression in skeletal muscle of mice with chronic allergic lung inflammation
Provedor de dados: Brazilian Journal of Medical and Biological Research
Autores: Durigan,J.L.Q.; Peviani,S.M.; Russo,T.L.; Silva,A.C.D.; Vieira,R.P.; Martins,M.A.; Carvalho,C.R.F.; Salvini,T.F.
We evaluated the effects of chronic allergic airway inflammation and of treadmill training (12 weeks) of low and moderate intensity on muscle fiber cross-sectional area and mRNA levels of atrogin-1 and MuRF1 in the mouse tibialis anterior muscle. Six 4-month-old male BALB/c mice (28.5 ± 0.8 g) per group were examined: 1) control, non-sensitized and non-trained (C); 2) ovalbumin sensitized (OA, 20 µg per mouse); 3) non-sensitized and trained at 50% maximum speed _ low intensity (PT50%); 4) non-sensitized and trained at 75% maximum speed _ moderate intensity (PT75%); 5) OA-sensitized and trained at 50% (OA+PT50%), 6) OA-sensitized and trained at 75% (OA+PT75%). There was no difference in muscle fiber cross-sectional area among groups and no difference in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Exercise training; Muscle atrophy; Asthma; Gene expression; Mice.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2009000400005

13CO2 recovery fraction in expired air of septic patients under mechanical ventilation
Provedor de dados: Brazilian Journal of Medical and Biological Research
Autores: Martins,M.A.; Coletto,F.A.; Martins-Filho,O.A.; Marchini,J.S.; Basile-Filho,A.
The continuous intravenous administration of isotopic bicarbonate (NaH13CO2) has been used for the determination of the retention of the 13CO2 fraction or the 13CO2 recovered in expired air. This determination is important for the calculation of substrate oxidation. The aim of the present study was to evaluate, in critically ill patients with sepsis under mechanical ventilation, the 13CO2 recovery fraction in expired air after continuous intravenous infusion of NaH13CO2 (3.8 µmol/kg diluted in 0.9% saline in ddH2O). A prospective study was conducted on 10 patients with septic shock between the second and fifth day of sepsis evolution (APACHE II, 25.9 ± 7.4). Initially, baseline CO2 was collected and indirect calorimetry was also performed. A primer of 5 mL...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Recovery fraction; 13CO2; Stable isotope; Septic shock; Intensive care setting.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2008000700003

Exhaled nitric oxide collected with two different mouthpieces: a study in asthmatic patients
Provedor de dados: Brazilian Journal of Medical and Biological Research
Autores: Leme,A.S.; Kasahara,D.I.; Nunes,M.P.T.; Martins,M.A.; Vieira,J.E.
Techniques for collecting exhaled nitric oxide (ENO) recommend the use of antibacterial filters of 0.3 µm. The aim of the present study was to compare the measurements of ENO obtained with two different filtering devices. Air samples from 17 asthmatic and 17 non-asthmatic subjects were collected by a recommended off-line technique using two different mouthpieces: 1) the Sievers disposable tool (A) under a breathing pressure of 18 cmH2O, and 2) a mouthpiece containing a HEPA filter (B) under a breathing pressure of 12 cmH2O. The nitric oxide samples were collected into an impermeable reservoir bag. Values for ENO were compared using two-way repeated measures ANOVA followed by the Tukey test. Agreement was assessed by Bland-Altman analysis. ENO values...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Exhaled nitric oxide; Asthma; Nitric oxide collecting apparatus; Filter.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2002001000004

Effect of salbutamol on pulmonary responsiveness in chronic pulmonary allergic inflammation in guinea pigs
Provedor de dados: Brazilian Journal of Medical and Biological Research
Autores: Kasahara,D.I.; Perini,A.; Lopes,F.D.T.Q.S.; Arantes-Costa,F.M.; Martins,M.A.; Nunes,M.P.T.
Beta-2-agonists have been widely used by asthmatic subjects to relieve their obstructive symptoms. However, there are reports that continuous use could lead to loss of bronchial protection and exacerbation of asthma symptoms. We evaluated the effect of two regimens of salbutamol administration (twice and five times a week) in a model of chronic airway inflammation in male Hartley guinea pigs (protocol starting weight: 286 ± 30 g) induced by repeated exposures to aerosols of ovalbumin (OVA). After sensitization, guinea pigs were exposed to aerosols of 0.1 mg/ml salbutamol solution twice a week (OVA + S2x, N = 7) or five times a week (OVA + S5x, N = 8). We studied allergen-specific (OVA inhalation time) and -nonspecific (response to methacholine) respiratory...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Salbutamol; Methacholine; Experimental asthma; Beta-agonist; Pulmonary responsiveness.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005000500009

Inactivation of capsaicin-sensitive nerves reduces pulmonary remodeling in guinea pigs with chronic allergic pulmonary inflammation
Provedor de dados: Brazilian Journal of Medical and Biological Research
Autores: Prado,C.M.; da Rocha,G.Z.; Leick-Maldonado,E.A.; Starling,C.M.; Capelozzi,V.L.; Martins,M.A.; Tibério,I.F.L.C.
Pulmonary remodeling is an important feature of asthma physiopathology that can contribute to irreversible changes in lung function. Although neurokinins influence lung inflammation, their exact role in the extracellular matrix (ECM) remodeling remains to be determined. Our objective was to investigate whether inactivation of capsaicin-sensitive nerves modulates pulmonary ECM remodeling in animals with chronic lung inflammation. After 14 days of capsaicin (50 mg/kg, sc) or vehicle administration, male Hartley guinea pigs weighing 250-300 g were submitted to seven inhalations of increasing doses of ovalbumin (1, 2.5, and 5 mg/mL) or saline for 4 weeks. Seventy-two hours after the seventh inhalation, animals were anesthetized and mechanically ventilated and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Collagen; Elastic fibers; Capsaicin; Chronic lung inflammation.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2011000200007

A novel hot-plate test sensitive to hyperalgesic stimuli and non-opioid analgesics
Provedor de dados: Brazilian Journal of Medical and Biological Research
Autores: Lavich,T.R.; Cordeiro,R.S.B.; Silva,P.M.R.; Martins,M.A.
It is widely accepted that the classical constant-temperature hot-plate test is insensitive to cyclooxygenase inhibitors. In the current study, we developed a variant of the hot-plate test procedure (modified hot-plate (MHP) test) to measure inflammatory nociception in freely moving rats and mice. Following left and right hind paw stimulation with a phlogogen and vehicle, respectively, the animals were placed individually on a hot-plate surface at 51ºC and the withdrawal latency for each paw was determined simultaneously in measurements performed at 15, 60, 180, and 360 min post-challenge. Plantar stimulation of rats (250 and 500 µg/paw) and mice (125-500 µg/paw) with carrageenan led to a rapid hyperalgesic response of the ipsilateral paw that reached a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hyperalgesia; Hargreaves' test; Modified hot-plate test; Carrageenan; Prostaglandin E2; Indomethacin.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005000300016