RESUMO
Musculoskeletal pain during pregnancy and lactation is a common finding. Differential diagnoses range from"normal" findings to disturbances in bone metabolism and pregnancy-associated osteoporosis (PAO). Imaging options are limited due to pregnancy, and laboratory diagnostics are time-consuming. Treatment of PAO with physiotherapy, pain killers and substitution of vitamin D and calcium leads to a rapid recovery from symptoms.
Assuntos
Artralgia/diagnóstico , Osteoporose/diagnóstico , Osteoporose/terapia , Complicações na Gravidez/diagnóstico , Complicações na Gravidez/terapia , Diagnóstico Diferencial , Feminino , Humanos , Transtornos da Lactação/diagnóstico , Transtornos da Lactação/terapia , GravidezRESUMO
In a series of studies carried out in different experimental models, we investigated the type(s) of lung afferents and mechanism(s) underlying the cigarette smoke-induced airway irritation and cough. In healthy non-smokers, the intensity of airway irritation and cough evoked by cigarette smoke was markedly reduced after premedication with hexamethonium. A similar pattern of responses was also triggered by inhalation of nicotine aerosol. These studies in human subjects suggested nicotine as the primary causative agent in cigarette smoke that evokes airway irritation. Indeed, single-fiber recording experiments performed in anesthetized dogs showed that both C-fibers and rapidly adapting receptors in the lungs and airways were stimulated by inhalation of one puff of cigarette smoke, and the intensity of this stimulatory effect was related to the nicotine content in the cigarette and abolished by hexamethonium. To further study the direct effect of nicotine on these sensory nerves, we measured the change in intracellular calcium concentration ([Ca(2+)](i)) of pulmonary sensory neurons isolated from the nodose and jugular ganglia of adult rats. Our results showed that nicotine evoked an abrupt and transient increase in [Ca(2+)](i) in approximately 34% of the 522 neurons tested, and 1,1-dimethyl-4-phenylpiperazinium, a selective agonist of the neuronal nicotinic acetylcholine receptors (NnAChRs), evoked a similar pattern of response as that of nicotine in these neurons. In conclusion, results of these studies show that nicotine exerts a direct stimulatory effect on vagal pulmonary sensory neurons. This stimulatory effect of nicotine is primarily responsible for the airway irritation and cough evoked by inhaled cigarette smoke, and is mediated through an activation of the NnAChRs.
Assuntos
Tosse/fisiopatologia , Estimulantes Ganglionares/efeitos adversos , Nicotina/efeitos adversos , Agonistas Nicotínicos/efeitos adversos , Receptores Nicotínicos/metabolismo , Fumaça/efeitos adversos , Adulto , Animais , Cães , Humanos , Exposição por Inalação , Irritantes/efeitos adversos , Pulmão/efeitos dos fármacos , Pulmão/inervação , Pulmão/fisiopatologia , Masculino , Neurônios , Neurônios Aferentes , Ratos , Receptores Nicotínicos/efeitos dos fármacos , Sistema Respiratório/fisiopatologia , Nicotiana/efeitos adversos , Nervo Vago/efeitos dos fármacos , Nervo Vago/fisiopatologiaRESUMO
Beta2-agonist drugs at inhaled supratherapeutic doses or when given orally or parenterally alter peripheral lymphocyte beta2-adrenoceptor density (betaAR) and have demonstrable metabolic effects. However, it is not known whether these changes occur at therapeutic inhaled doses. We therefore studied the effects of therapeutic doses of inhaled albuterol in five asthmatic subjects (mean age 23.0+/-2.4 years) and six normal subjects (mean age 28.3+/-3.3 years). Subjects were studied in a randomized, double-blind protocol in which each subject received either inhaled albuterol (270 microg four times daily) for 2 weeks followed by placebo or vice versa in two sequential 2-week periods separated by a 2-week washout period. In the asthmatics, baseline FEV1 increased significantly (p < 0.05) after 2 weeks of inhaled albuterol treatment compared to the initial visit and after 2 weeks of placebo (mean FEV1: 3.2 L+/-0.7 L, 2.9 L+/-0.5 L, and 3.0 L+/-0. 7 L, respectively). Baseline peripheral lymphocyte betaAR was not significantly different (p > 0.05) between the asthmatic (mean: 757+/-176) and normal subjects (mean: 732+/-251). However, in neither group was there any significant change (p > 0.05) in betaAR or plasma potassium, insulin, or glucose, either acutely or after 2 weeks of albuterol therapy. The present study confirms that there is no difference in peripheral lymphocyte betaAR between asthmatic and normal subjects and also shows that at therapeutic doses of inhaled albuterol, there are no significant changes in betaAR or metabolic effects.
Assuntos
Agonistas Adrenérgicos beta/administração & dosagem , Albuterol/administração & dosagem , Asma/tratamento farmacológico , Asma/metabolismo , Receptores Adrenérgicos beta 2/efeitos dos fármacos , Adulto , Asma/fisiopatologia , Estudos Cross-Over , Método Duplo-Cego , Feminino , Volume Expiratório Forçado , Humanos , MasculinoRESUMO
BACKGROUND: A biphasic-plateau pattern in the maximal expiratory flow-volume (MEFV) curve has been described after single-lung transplantation (SLT) in patients with chronic airways obstruction (CAO). It has been theorized that this pattern is either related to stenosis at the anastomotic or subanastomotic site, or the sum of the airflow contribution from the native lung with airways obstruction and transplanted lung. SUBJECTS AND METHODS: We analyzed data in 16 patients with CAO who had undergone transplantations (5 men, 11 women; mean age [+/- SD], 53.8 +/- 4.9 years), and 9 patients with pulmonary vascular disease (PVD) without airways obstruction who had undergone transplantations (2 men, 7 women; mean age, 35.4 +/- 11.4 years). RESULTS: In the patients with PVD, there were no significant changes in static or dynamic lung volumes or in the MEFV curve after SLT. In the patients with CAO, indexes of airways obstruction improved significantly after SLT, and the typical biphasic-plateau pattern developed in the MEFV curve. In one patient with CAO who required pneumonectomy of the native lung after SLT, the biphasic pattern was absent. CONCLUSIONS: These results support the view that this MEFV pattern is a result of airflow from the native and transplanted lungs in patients with CAO. In addition, the results show that in patients with no prior airways obstruction, SLT does not alter static or dynamic lung volumes or maximal expiratory flow rate.
Assuntos
Pneumopatias Obstrutivas/cirurgia , Transplante de Pulmão/fisiologia , Curvas de Fluxo-Volume Expiratório Máximo , Adulto , Obstrução das Vias Respiratórias/diagnóstico , Obstrução das Vias Respiratórias/fisiopatologia , Anastomose Cirúrgica , Diagnóstico Diferencial , Feminino , Seguimentos , Humanos , Pneumopatias Obstrutivas/diagnóstico , Pneumopatias Obstrutivas/fisiopatologia , Medidas de Volume Pulmonar , Masculino , Pessoa de Meia-Idade , Complicações Pós-Operatórias/diagnóstico , Complicações Pós-Operatórias/fisiopatologiaRESUMO
BACKGROUND: The aim of this study was to develop and characterize a mouse xenograft model for the hypercalcemic-type of small cell carcinoma of the ovary (HTSCCO). PATIENTS AND METHODS: Tumor fragments were removed from a patient and cultured in six subsequent generations of nude mice. Histology, comparative genomic hybridization (CGH), electron microscopy and serum calcium levels were investigated. RESULTS: Morphology remained the same from the primary tumor of the patient through the 6th passage in the mouse. Serum calcium levels were significantly higher in the tumor-bearing mice compared to controls. CGH of the HTSCCO did not show evidence of a close relationship to either a germ cell tumor or an epithelial ovarian cancer. CONCLUSION: Some evidence was provided that the HTSCCO is an inhomogeneous tumor that is neither related to a germ cell tumor nor to an epithelial ovarian cancer, but is a distinct tumor entity.
Assuntos
Carcinoma de Células Pequenas/patologia , Hipercalcemia/patologia , Neoplasias Ovarianas/patologia , Células Tumorais Cultivadas , Adulto , Animais , Cálcio/sangue , Carcinoma de Células Pequenas/sangue , Carcinoma de Células Pequenas/genética , Divisão Celular/fisiologia , Aberrações Cromossômicas , Feminino , Humanos , Hipercalcemia/sangue , Hipercalcemia/genética , Camundongos , Camundongos Nus , Microscopia Eletrônica , Transplante de Neoplasias , Hibridização de Ácido Nucleico , Neoplasias Ovarianas/sangue , Neoplasias Ovarianas/genética , Transplante HeterólogoRESUMO
Detailed knowledge of chromosomal aberrations in a specific tumor may facilitate the development of individually tailored chemotherapy, hormone or gene therapy. Unfortunately, karyotype analysis requires living cells and is complicated by the low number of good metaphase spreads obtained. Comparative genomic hybridization (CGH), however, is capable of detecting and mapping genome-wide amplifications and deletions using an equimolar mixture of normal and tumor cell DNA. We show here that even the few cells from a fine needle aspirate of a tumor are sufficient for a direct CGH assay, independent of DNA amplification. Ten primary breast cancers were analyzed by CGH. A fresh frozen fine needle aspirate and a formalin-fixed and paraffin-embedded section were used for each tumor. Metaphases from each CGH reaction were imaged, and a sum ratio profile was determined for every chromosome. The ratio profiles of DNA isolated from the 2 material sources were then compared. Fine needle aspirates and the paraffin-embedded material of a single tumor yielded the same fluorescence ratio profiles, albeit with slightly different confidence intervals. Different tumors showed a variety of aberrations. The most frequently observed changes were 1q+, 8q+, 14q-, 16p+, 16q-, 17p-, 17q+, 19q+, 20q+, 21q- and 22q-. The ability of CGH to assess chromosomal changes in breast cancer from fine needle aspirates could facilitate genetic evaluation of tumors prior to surgery.
Assuntos
Neoplasias da Mama/genética , Neoplasias da Mama/patologia , Mapeamento Cromossômico , Hibridização de Ácido Nucleico/métodos , Adulto , Idoso , Idoso de 80 Anos ou mais , Biópsia por Agulha , Cromossomos Humanos , Intervalos de Confiança , Feminino , Humanos , Cariotipagem , Pessoa de Meia-Idade , Receptores de Estrogênio/análise , Receptores de Progesterona/análiseRESUMO
Comparative genomic hybridization (CGH) is a FISH-related technique used to assess global chromosomal aberrations in a variety of human tumours. Recently CGH has been applied to cytogenetic analysis of fresh frozen fetoplacental tissues. Here we report the application of CGH to paraffin-embedded placental samples. Ten samples from paraffin-embedded blocks of 6 control placentas and fetoplacental tissue from 10 aneuploidies, and 2 unbalanced aberrations were evaluated. Balanced karyotype profiles were obtained from samples of healthy placentas and all samples from the same placenta appeared to have similar confidence intervals. CGH analysis of four cases of trisomy 21, three cases of trisomy 18, one case of trisomy 13, one case of trisomy 15 and one case of trisomy 7 all showed overrepresentation of the respective trisomic chromosome. The CGH profile was also in accordance with the karyotyping of a case with isochromosome 21. The CGH profile of a case with der (2)t(2;6)(q37.3;q22.2) revealed partial trisomy for chromosome 6 between q21 and q27. CGH may be a useful adjunct in prenatal genetic diagnosis when retrospective diagnosis is needed from archival samples.
Assuntos
Aberrações Cromossômicas , Análise Citogenética , Hibridização de Ácido Nucleico , Placenta/química , Cromossomos Humanos Par 13 , Cromossomos Humanos Par 18 , Cromossomos Humanos Par 2 , Cromossomos Humanos Par 21 , Cromossomos Humanos Par 6 , Síndrome de Down/diagnóstico , Síndrome de Down/genética , Feminino , Deleção de Genes , Humanos , Isocromossomos , Cariotipagem , Parafina , Gravidez , Inclusão do Tecido , TrissomiaRESUMO
Although the coexistence of mucinous ovarian neoplasms and Brenner tumors is well established, the histogenesis and developmental relationship between the two remain unknown. We used comparative genomic hybridization to analyze two such tumors occurring simultaneously, one in each ovary, in a patient. Amplification of 12q14-21 sequences was found in both tumors; in addition, both tumors also had other, different changes, four identified in the Brenner tumor and six in the mucinous carcinoma. The occurrence of the same genetic alteration in both tumors in this woman suggests that the mucinous carcinoma and Brenner tumor may be clonally related, i.e., one arose from the other by means of metastatic spreading of transformed cells from one ovary to the other. An alternative explanation is that some unknown, putative tumorigenic agent induced similar and synchronous pathogenetic changes in the epithelium of both ovaries. The phenotypic differences between the tumors are presumably attributable to the other unique genetic abnormalities identified in both tumor types.
Assuntos
Adenocarcinoma Mucinoso/genética , Adenocarcinoma Mucinoso/patologia , Tumor de Brenner/genética , Tumor de Brenner/patologia , Neoplasias Primárias Múltiplas/genética , Neoplasias Primárias Múltiplas/patologia , Neoplasias Ovarianas/genética , Neoplasias Ovarianas/patologia , Adenocarcinoma Mucinoso/química , Tumor de Brenner/química , DNA de Neoplasias/análise , Feminino , Humanos , Pessoa de Meia-Idade , Neoplasias Primárias Múltiplas/química , Hibridização de Ácido Nucleico , Neoplasias Ovarianas/químicaRESUMO
The direct effects of hypoxia on exercise-induced breathlessness are unclear. Increased breathlessness on exercise is known to occur at high altitude, but it is not known whether this is related to the hypoxia per se, or to other ventilatory parameters. To examine the role of high-altitude hypoxia in exercise-induced breathlessness, studies were performed in 10 healthy, normal subjects at sea level and after acute exposure to an altitude of 4450 m. Although the perception of hand weights did not alter between sea level and high altitude, the intensity of exercise-induced breathlessness increased significantly at high altitude. This was associated with a higher minute ventilation and respiratory frequency for any given exercise level, whereas tidal volume was not significantly altered from sea level values. The increased intensity of breathlessness with exercise did not change significantly over the 5 days at high altitude. These results suggest that the increased intensity of exercise-induced breathlessness at high altitude is not related to peripheral mechanisms or the pattern of ventilation, or to the level of hypoxia per se, but to the level of reflexly increased ventilation.
Assuntos
Doença da Altitude/fisiopatologia , Exercício Físico/fisiologia , Pulmão/fisiopatologia , Doença Aguda , Adulto , Análise de Variância , Humanos , Masculino , Pessoa de Meia-Idade , Testes de Função Respiratória , Insuficiência Respiratória/fisiopatologia , Fatores de Tempo , Percepção de PesoRESUMO
Beta2-adrenergic receptor (betaAR) density on peripheral blood lymphocytes has been used as an index to reflect the betaAR state of the body. Lymphocytes betaARs are unequally distributed among lymphocyte subpopulations, with the highest density on CD8+ cells and the lowest on CD4+ cells. Thus, the measurement of peripheral blood lymphocyte betaAR density could vary with changes in CD4+ and CD8+ cell concentrations. We examined the individual and intersubject variance of betaAR density and lymphocyte subpopulations over time in 10 normal subjects, studied on 3 to 5 different d always at approximately 9:00 A.M. over a 4- to 12-wk period. Peripheral blood lymphocytes were isolated and beta2-adrenergic receptor density was determined by specific binding of [125I]-(-)iodopindolol, and lymphocyte subpopulations were measured by flow cytometry. Average receptors per lymphocyte were 776 +/- 183. Whereas the absolute values of CD4+% and CD8+% cell concentrations varied little in individual subjects (coefficient of variation 9.5% and 11.1%, respectively), the individual betaAR variance was greater (coefficient of variation 22.4%). However there was a significant correlation between betaAR and CD4+% and CD8+% cell concentration (correlation coefficients: -0.58, p < 0.001; +0.51, p < 0.001, respectively). This information is relevant to interpretations of changes in peripheral betaAR in humans.
Assuntos
Linfócitos/metabolismo , Receptores Adrenérgicos beta 2/análise , Agonistas Adrenérgicos beta , Adulto , Sangue , Contagem de Linfócito CD4 , Relação CD4-CD8 , Linfócitos T CD4-Positivos/metabolismo , Linfócitos T CD8-Positivos/metabolismo , Ritmo Circadiano , Feminino , Citometria de Fluxo , Seguimentos , Humanos , Radioisótopos do Iodo , Contagem de Linfócitos , Subpopulações de Linfócitos/citologia , Subpopulações de Linfócitos/metabolismo , Linfócitos/citologia , Masculino , Pindolol/análogos & derivados , Compostos RadiofarmacêuticosRESUMO
BACKGROUND: In comparison to beta-agonist drugs, which are the primary bronchodilator drugs in current use in asthma, both oral theophylline and inhaled ipratropium have a weaker bronchodilating action in asthma. Although a number of studies have shown an additive effect of ipratropium in combination with beta-agonist bronchodilator drugs in asthmatics, to our knowledge, the effects of combined treatment with ipratropium and theophylline have not been assessed. STUDY OBJECTIVE: To assess whether the combination of oral theophylline and inhaled ipratropium has an additive bronchodilator effect in asthmatics. DESIGN: Double-blind, placebo-controlled, crossover study. SUBJECTS: Nineteen patients (8 male, 11 female) with mild-to-moderate stable asthma. METHODS: Initially the optimal single oral dose of theophylline required to achieve therapeutic blood levels (10 to 20 microg/mL) was established in each patient. They then returned at varying intervals on 4 subsequent days. On each day, they received, in a random, placebo-controlled, double-blind, crossover design, one of four different therapies: oral and inhaled placebo; oral theophylline at the established optimal dose (range, 300 to 700 mg) plus inhaled placebo; oral placebo plus inhaled (40 microg) ipratropium; and the combination of theophylline and ipratropium. Spirometry was performed at baseline and at 15 min, 30 min, and hourly intervals for 6 h after therapy. RESULTS: Each drug regimen resulted in a significant (p<0.05) increase in FEV1, but the combined regimen resulted in a significantly greater bronchodilation (p<0.05) over either ipratropium or theophylline alone (FEV1=3.00+/-0.75 L vs 2.48+/-0.77 L vs 2.61+/-0.72 L, respectively, at 3 h postdrug). CONCLUSIONS: There was a significant, early, sustained additive bronchodilator effect of the combination therapy; there were no untoward side effects. These findings indicate that the addition of inhaled ipratropium to oral theophylline provides greater bronchodilation than either drug alone and may be a useful therapeutic modality in asthma.
Assuntos
Asma/tratamento farmacológico , Broncodilatadores/administração & dosagem , Ipratrópio/administração & dosagem , Teofilina/administração & dosagem , Administração por Inalação , Administração Oral , Adolescente , Adulto , Análise de Variância , Asma/fisiopatologia , Estudos Cross-Over , Método Duplo-Cego , Quimioterapia Combinada , Feminino , Volume Expiratório Forçado , Humanos , Masculino , Pessoa de Meia-Idade , Espirometria/estatística & dados numéricosRESUMO
To investigate the role of tachykinin release in mediating the bronchoconstrictive effect of sulfur dioxide (SO2) inhalation, measurements of dynamic lung compliance (Cdyn), total pulmonary resistance (RL), and arterial blood pressure (ABP) were made in anesthetized guinea pigs. Brief exposure (six tidal breaths) to SO2 at concentrations between 500 and 2,000 parts/million resulted in a concentration-dependent increase in RL, decrease in Cdyn, and systemic hypotension. For example, SO2 at 2,000 parts/million induced reversible and reproducible changes in RL, Cdyn, and ABP of 1,041 +/- 234, -60 +/- 6, and -25.8 +/- 4.3% of the baseline values, respectively. Pretreatment with two selective neurokinin- (NK) receptor (NK1 and NK2) antagonists, CP-99994 and SR-48968, resulted in almost complete inhibition of the increase in RL and of the decrease in Cdyn while preserving the decrease in ABP. Antagonism of the NK2 receptor alone resulted in inhibition of the majority of the SO2-induced bronchoconstriction, whereas that of the NK1 and muscarinic receptors did not have a significant effect. We conclude that the release of tachykinins from sensory endings plays a central role in SO2-induced bronchoconstriction in anesthetized guinea pigs, primarily via the activation of the NK2 receptor.
Assuntos
Resistência das Vias Respiratórias/efeitos dos fármacos , Broncoconstrição/efeitos dos fármacos , Dióxido de Enxofre/farmacologia , Taquicininas/farmacologia , Animais , Relação Dose-Resposta a Droga , Cobaias , Masculino , PressãoRESUMO
To determine whether nicotine is involved in evoking the irritant effects of cigarette smoke in airways, we studied the responses to inhalation of a single puff (30 ml) of three types of smoke (high nicotine, low nicotine, and gas phase) in healthy male nonsmokers. After the upper airways were locally anesthetized, the subjects, breathing through a mouthpiece, were instructed to signal the detection and the intensity of airway irritation with a push-button device. Inhalation of high-nicotine smoke consistently triggered an intense airway irritation in the lower neck and upper chest region; the total number of push-button signals generated in the first 5 s was 6.61 +/- 0.87 (mean +/- SE, n = 12), with a detection latency of 0.93 +/- 0.11 s. By contrast, inhalation of low-nicotine and gas phase smoke either was not detected or caused only very mild irritation (0.89 +/- 0.4 and 0.36 +/- 0.22, respectively). In addition, the intensity of smoke-induced airway irritation was markedly reduced after premedication with aerosolized hexamethonium, a nicotinic receptor antagonist (P < 0.01, n = 8). Furthermore, inhalation of nicotine aerosol also immediately evoked intense airway irritation and coughs (n = 5). Thus we conclude that the airway irritation evoked by inhaling cigarette smoke results from an activation of sensory endings located in the central airways and nicotine is the primary agent responsible for this action.
Assuntos
Irritantes/toxicidade , Nicotina/toxicidade , Sistema Respiratório/patologia , Fumar/patologia , Adulto , Aerossóis , Anestesia Local , Compostos de Hexametônio/farmacologia , Humanos , Masculino , Nicotina/administração & dosagem , Nicotina/antagonistas & inibidores , Antagonistas Nicotínicos , Testes de Função RespiratóriaRESUMO
In relation to the Swiss average our hospital has had a constant high rate of spontaneous deliveries and a low rate of cesarean sections. On the other hand the rate of obstetrical peridural anesthesia has been increasing significantly since 1986. This is above all related to its more frequent usage in cases of cervical dystocia and intolerable birth pain. Exactly in these indications peridural anesthesia has been very successful. In almost three quarters of the above-mentioned cases a cesarean section can be avoided due to peridural anesthesia.
Assuntos
Anestesia Epidural/estatística & dados numéricos , Anestesia Obstétrica/estatística & dados numéricos , Cesárea/estatística & dados numéricos , Adulto , Áustria/epidemiologia , Estudos Transversais , Distocia/epidemiologia , Feminino , Humanos , Incidência , Recém-Nascido , GravidezRESUMO
Acetazolamide treatment ameliorates the symptoms of AMS; however, the mechanism by which this occurs is unclear. To examine the effects of acetazolamide on oxygenation, CO2 responsiveness and ventilatory pattern during acute exposure to HA, we studied two groups of subjects at SL and following rapid (less than 8 h) transport to HA. Acetazolamide or placebo tablets were given to groups 1 and 2, respectively, in a double-blind manner after baseline SL measurements; treatment was continued during HA exposure. There was no difference in the ventilatory pattern at HA, between the two groups. While the Ve achieved in response to CO2 at HA vs SL was much greater in each group the percent change from baseline at HA versus that at SL was not significantly different. The beneficial effects of acetazolamide in AMS are associated with a higher level of ventilation at HA and better oxygenation: CO2 chemosensitivity is not affected by acetazolamide at HA.
Assuntos
Acetazolamida/uso terapêutico , Doença da Altitude/tratamento farmacológico , Respiração/efeitos dos fármacos , Adulto , Doença da Altitude/sangue , Doença da Altitude/fisiopatologia , Dióxido de Carbono/sangue , Método Duplo-Cego , Humanos , Masculino , Oxigênio/sangueRESUMO
We examined 4 gravidae with rupture of membranes before the 24th week of gestation. In contrast to pathophysiological models we observed fetal respiratory movements and a reduced amount of amniotic fluid in all patients.
Assuntos
Ruptura Prematura de Membranas Fetais/fisiopatologia , Maturidade dos Órgãos Fetais/fisiologia , Doença da Membrana Hialina/fisiopatologia , Síndrome do Desconforto Respiratório do Recém-Nascido/fisiopatologia , Adulto , Feminino , Humanos , Recém-Nascido , Pulmão/embriologia , Gravidez , Segundo Trimestre da GravidezRESUMO
In order to examine the relationship of mouth occlusion pressure (MOP), an index of central inspiratory neuromuscular drive, to age and sex and to resting ventilation (VE), measurements were made in the seated posture in 84 healthy, normal subjects (38 men, 46 women; ages 18-72 years, mean +/- SD = 39.8 +/- 14.5 years) and in 79 patients with either airways obstruction (n = 63) or restrictive lung disease (n = 16). In the normal subjects, there was no significant relationship between age or sex and MOP (expressed as P0.1), which is the mouth pressure developed against a complete occlusion at 0.1 s after the beginning of inspiration, and dP/dtmax, the maximal rate of rise of this pressure; mean +/- SD for P0.1 = 0.75 +/- 0.32 cmH2O, and dP/dtmax = 19.41 +/- 10.10 cmH2O/s. Similarly, there was no significant relationship between age or sex and VE/P0.1 or VE/dP/dtmax. In 99 percent of normal subjects (83 of 84), VE/P0.1 was greater than 8.0 L/min/cmH2O, whereas in only 1 of the 79 patients was the value greater than 7.9 L/min/cmH2O. While the mean values of P0.1 and dP/dtmax were significantly different between normal subjects and patients, there was considerable overlap, whereas the ratio VE/P0.1 or VE/dP/dtmax provided excellent differentiation between normal subjects and patients with lung disease. This index, which is easily measured and requires minimal patient cooperation, provides valuable information in the clinical assessment of ventilatory drive and lung mechanics.
Assuntos
Boca/fisiologia , Respiração/fisiologia , Adulto , Feminino , Volume Expiratório Forçado , Humanos , Masculino , Pessoa de Meia-Idade , Pressão , Testes de Função Respiratória , Descanso , Capacidade VitalRESUMO
This clinical investigation was designed to characterize the pharmacologic response to theophylline in elderly individuals. Incremental theophylline plasma concentrations (0, 5, 10, 15, and 20 mcg/mL), achieved through dose escalation of intravenous aminophylline, were correlated with pulmonary airway responses in ten young and ten elderly male asthmatic volunteers. The older group had lower baseline pulmonary function values, suggestive of a greater degree of baseline airways obstruction. Despite wide intersubject variability, the elderly subjects demonstrated a lower absolute change in bronchodilator response to equal concentrations of theophylline than did their younger counterparts (P less than .05). A progressive increase in heart rate was noted with increasing theophylline concentrations, but no significant difference in heart rate change between groups was detected (P greater than .05). Whether the difference in theophylline induced bronchodilator response observed in the young and elderly groups is due to a difference in age or in severity of airway obstruction is yet unknown.
Assuntos
Aminofilina/farmacologia , Asma/tratamento farmacológico , Brônquios/efeitos dos fármacos , Adulto , Idoso , Aminofilina/administração & dosagem , Aminofilina/sangue , Asma/sangue , Asma/fisiopatologia , Volume Expiratório Forçado/efeitos dos fármacos , Humanos , Infusões Intravenosas , Masculino , Pessoa de Meia-Idade , Capacidade VitalRESUMO
Breast cancer seems to represent a heterogeneous group of neoplasia originating from the parenchymal epithelium of the mammary gland. Family studies combined with genetic epidemiological analyses and histological evaluations were used to gain an insight into this nosological entity. Special emphasis was given to the type and frequency of neoplasia in close relatives. This study represents pedigrees of 36 histologically defined pure tubular and 22 pure medullary breast cancer patients as well as 171 with the invasive ductal form. The incidence of cancer in the first degree relatives of all three groups is compared to that of the local population. The first degree relatives did not have a higher risk (RR) for the neoplastic diseases. However, breast cancer occurs more frequently in the female relatives of all three groups. Other cancers have different relative risks.