Effects of Inspiratory Muscle Training Using an Electronic Device on Patients Undergoing Cardiac Surgery: A Randomized Controlled Trial

Abstract Background Cardiac surgery causes pathophysiological changes that favor the occurrence of pulmonary and functional complications. Objective To investigate the effects of inspiratory muscle training (IMT) with an electronic device on patients undergoing cardiac surgery. Methods A randomized controlled trial was conducted with 30 adult patients undergoing elective cardiac surgery. A control group (CG) received conventional physical therapy care, and an intervention group (IG) received IMT using the POWERbreathe K5® electronic device. Two daily sessions of physical therapy were performed at the intensive care unit and one daily session at the ward until the sixth postoperative day. The following variables were measured preoperatively and on the sixth postoperative day, in both groups: inspiratory muscle strength, dynamic inspiratory muscle strength, and peak inspiratory flow. Data distribution was evaluated by the Shapiro-Wilk test. Analysis of variance was used, and the results were considered statistically significant when p < 0.05. Results Maximal inspiratory pressure (71.7 ± 17.1 cmH2O vs 63.3 ± 21.3 cmH2O; p = 0.11], S-index (52.61 ± 18.61 vs 51.08 ± 20.71), and peak inspiratory flow [(2.94 ± 1.09 vs 2.79 ± 1.26)] were maintained in the IG but had a significant reduction in the CG. Conclusion IMT performed with an electronic device was effective at maintaining inspiratory muscle strength, dynamic inspiratory muscle strength, and peak inspiratory flow when compared to conventional physical therapy. Int J Cardiovasc Sci. 2020; [online].ahead print, PP.0-0

Sintomas de Fadiga e Força Muscular Respiratória de Pacientes Onco-hematológicos em Quimioterapia / Fatigue Symptoms and Respiratory Muscle Strength of Onco-hematological Patients in Chemotherapy / Síntomas de Fatiga y Fuerza de los Músculos Respiratorios de Pacientes Onco-hematológicos en Quimioterapia

Introdução: Quando exposto à quimioterapia, o paciente onco-hematológico está suscetível a várias complicações físicas e respiratórias, associadas aos efeitos colaterais dessas substâncias. Objetivo: Avaliar o impacto de força muscular respiratória quando comparada com os níveis de normalidade e sintomatologia de fadiga, durante recebimento do tratamento quimioterapêutico de pacientes onco-hematológicos. Método: Pesquisa observacional do tipo transversal, realizada por meio de questionário referente aos dados sociodemográficos e de manovacuometria com dispositivo analógico. Resultados: A pesquisa foi constituída por uma população composta de 19 pessoas, 57,9% mulheres e 42,9% homens. A idade média foi de 51,3 anos. A predominância diagnóstica foi leucemia, seguida por linfoma e mieloma. Entre as queixas, a dispneia esteve presente em 31,6% dos casos, sendo a quimioterapia o protocolo escolhido para todos os participantes. Durante a avaliação, 52,6% relataram cansaço e, entre eles, 70% relataram sentir-se melhor quando em repouso, seguidos por 50% impedidos de realizar suas atividades diárias. Ex-fumantes representaram 70% da população pesquisada e 84,2% não praticavam atividades físicas. Na amostra, 62,4% apresentaram frequência respiratória normal, predominando o padrão respiratório apical e o tórax longilíneo. Foram observados resultados significativos na diminuição de Pimáx e Pemáx, com valores estatisticamente conclusivos de p<0,001 nas duas variáveis. Conclusão: O quadro da doença, os tratamentos utilizados e as internações a que essa população foi submetida provocaram a diminuição da força muscular respiratória e o aumento dos sintomas de fadiga.

Introduction: When exposed to chemotherapy, the onco-hematological patient is susceptible to several physical and respiratory complications, associated with side effects of these substances. Objective: Evaluate the impact on respiratory muscle strength when compared to the levels of normality and symptoms of fatigue of onco-hematological patients during chemotherapy treatment. Method: Observational cross-sectional study performed trough a social demographic questionnaire and manovacuometry with analogical device. Results: The study population consisted of 19 subjects, 57.9% women and 42.9% men. The average age was 51.3 years old. The predominant diagnoses were leukemia, followed by lymphoma and myeloma. Among the complaints, dyspnea was present in 31.6% of the cases, chemotherapy was the protocol of choice for all the participants. During the evaluation, 52.6% reported tiredness, and among them, 70%, claimed they feel better when at rest, followed by 50% precluded from performing their daily activities. Ex-smokers represented 70% of the study population and 84.2% did not practice physical activities. 62.4 % of the sample presented normal respiratory frequency, with the apical breathing pattern and predominant slender thorax. Significant results were observed in decreasing MIP and MEP with statistically conclusive values of p<0.001 for the two variables. Conclusion: The disease, the treatments and the hospitalizations this population was submitted provoked the reduction of the respiratory muscle strength and increase of the fatigue symptoms

Introducción: Cuando se expone a quimioterapia, el paciente oncohematológico es susceptible a diversas complicaciones físicas y respiratorias, asociadas a los efectos secundarios de estas sustancias. Objetivo: Evaluar el impacto de la fuerza de los músculos respiratorios en comparación con los niveles de normalidad y síntomas de fatiga, mientras reciben tratamiento de quimioterapia de pacientes oncohematológicos. Método: Investigación observacional transversal, realizada mediante un cuestionario referente a datos sociodemográficos y realizando manovacuometría con dispositivo analógico. Resultados: La investigación consistió en una población compuesta por 19 personas, 57,9% mujeres y 42,9% hombres. La edad media fue de 51,3 años. El predominio diagnóstico fue la leucemia, seguida del linfoma y el mieloma. Entre las quejas, la disnea estuvo presente en el 31,6% de los casos, siendo la quimioterapia el protocolo elegido para todos los participantes. Durante la evaluación, el 52,6% refirió cansancio y, entre ellos, el 70% refirió sentirse mejor en reposo, seguido del 50% incapaz de realizar sus actividades diarias. Los exfumadores representaron el 70% de la población encuestada y el 84,2% no practicaba actividad física. En la muestra, el 62,4% tenía frecuencia respiratoria normal, con predominio de patrón respiratorio apical y tórax longilineal. Se observaron resultados significativos en la disminución de Pimax y Pmax, con valores estadísticamente concluyentes de p<0,001 en ambas variables. Conclusión: Debido a la enfermedad, los tratamientos utilizados y las hospitalizaciones a las que esta población fueron sometidos provocaron la disminución de la fuerza de los músculos respiratorios y aumento de los síntomas de fatiga

Correlação entre os níveis de independência, nutrição, provas de forças de músculos ventilatórios e equilíbrio em idosos / Correlation amongdegrees of independence, mutrition, ventilatory muscles streng tests and equilibrium in olde adults

Introdução: O processo de envelhecimento proporciona alterações funcionais, psicossociais e biológicas de caráter progressivo e irreversível, diminuindo a capacidade funcional e pulmonar dos idosos. A fraqueza muscular presente nos idosos pode reduzir o nível de atividades funcionais e do sistema respiratório, favorecendo a inatividade e dependência. Objetivo: Avaliar a correlação entre a capacidade funcional e pulmonar em idosos. Metodologia: Estudo descritivo transversal, no qual foi realizada uma avaliação por meio do Índice de Barthel Modificado, da PI máx, PE máx com a utilização de manuvacuometro, da circunferência da panturrilha (CP) e do teste Timed Up and Go (TUG). A amostra foi de 40 idosos. Resultados: a associação significativa entre achados de força da musculatura inspiratória, CP, teste TUG, Índice de Barthel, PI máx, PE máx e idade, correlaciona a redução da força muscular com menor nível de capacidade funcional em idosos, ainda mais significativa no sexo masculino, com menor tempo para a realização do teste TUG, comparado ao sexo feminino. Conclusão: Houve correlação entre o nível de capacidade funcional e pulmonar de idosos, demonstrando a importância da associação do treinamento da função respiratória associado ao exercício físico.(AU)

Introduction: The aging process provides functional, psychosocial and biological changes of a progressive and irreversible character, reducing the functional and pulmonary capacity of older adults. The muscular weakness present in older persons reduces the level of functional activities and the respiratory system, favoring inactivity and dependence. Objective: Evaluate the correlation between functional and pulmonary capacity in older people. Methodology: A physical therapy evaluation was performed through an evaluation form deve loped by the authors and the Modified Barthel Index. The rating consisted of identification, pulmonary evaluation, calf circumference (CP) and performance the Timed Up and Go test (TUG). The data was collected at a long permanence institution for older adults, located in the interior of Goiás, with a sample of 40 older individuals. Results: The association between inspiratory muscle strength, CP, TUG test, Barthel index, PI max, PE max and age, correlate the reduction of muscle strength with lower level of functional capacity in older adults, even more significant in sex male, with less time to perform the TUG test, compared to the female. Conclusion: Is suggested a correlation between the level of functional and pulmonary capacity of older people, demonstrating the importance of the association of respiratory function training associated to physical exercise.(AU)

Capacidade pulmonar, muscular e funcional de pacientes com doença renal crônica / Pulmonary, muscular and functional capacity of patients with chronic kidney disease

Objetivo: Conhecer o perfil pulmonar, muscular e funcional de pacientes com doença renal crônica (DRC) e verificar a relação entre a força muscular periférica e a capacidade funcional desses pacientes. Métodos: 21 pacientes com DRC e 17 saudáveis foram avaliados quanto à antropometria, função pulmonar, força muscular periférica e capacidade funcional. Para comparação entres os grupos foi utilizado o teste t de Student ou U de Mann Whitney. Para correlacionar a força muscular periférica com a capacidade funcional do grupo DRC utilizou-se o coeficiente de Pearson ou Spearman. Resultados: Houve diferença estatisticamente significativa entre os grupos DRC e saudável, respectivamente, nas variáveis da função pulmonar: volume expiratório forçado no primeiro segundo (77,62 ± 18,05% vs. 99,71 ± 16,43%; p = 0,001) e capacidade vital forçada (78,86 ± 17,16% vs. 98,48 ± 16,99%; p = 0,001); e na força muscular periférica de quadríceps direito (127,76 ± 49,77 Nm vs. 170,90 ± 55,38 Nm; p = 0,006) e esquerdo (134,10 ± 55,19 Nm vs. 171,05 ± 57,86 Nm; p = 0,04). O teste de caminhada de 6 minutos foi menor no grupo DRC comparado ao saudável em valor absoluto (419,95 ± 98,51m vs. 616,90 ± 90,01m; p < 0,0001) e em % do predito (66,07 ± 15,04% vs. 94,80 ± 9,35%; p < 0,0001). Observou-se correlação moderada entre a capacidade funcional e a força muscular periférica de quadríceps direito (rho = 0,52; p = 0,01) e quadríceps esquerdo (r = 0,63; p = 0,002) no grupo DRC. Conclusão: Pacientes com DRC apresentam alteração na função pulmonar, redução da força muscular periférica e da capacidade funcional. (AU)

Objective: To study the pulmonary, muscular and functional profile of patients with chronic kidney disease (CKD) and verify the correlation between peripheral muscle strength and functional capacity of these patients. Methods: 21 patients with CKD and 17 healthy individuals were evaluated for anthropometry, pulmonary function, peripheral muscle strength and functional capacity. In the comparison between the groups, the Student t test or the Mann Whitney U test were used. Correlation of peripheral muscle strength with the functional capacity of the CKD group was tested by the Pearson or Spearman coefficient. Results: There was a statistically significant difference between the CKD and healthy groups, respectively, in the pulmonary function variables: forced expiratory volume in the first second (77.62 ± 18.05% vs. 99.71 ± 16.43%, p = 0.001) and forced vital capacity (78.86 ± 17.16% vs. 98.48 ± 16.99%, p=0.001); and right quadriceps muscle strength (127.76 ± 49.77 Nm vs. 170.90 ± 55.38 Nm, p = 0.006) and left quadriceps (134.10 ± 55.19 Nm vs. 171.05 ± 57.86 Nm; p = 0.04). The 6-minute walk test was lower in the CKD group compared to healthy in absolute values (419.95 ± 98.51 m vs. 616.90 ± 90.01 m, p < 0.0001) and in % predicted (66,07 ± 15.04% vs. 94.80 ± 9.35%, p<0.0001). There was a moderate correlation between functional capacity and muscle strength of right quadriceps (rho = 0.52, p = 0.01) and left quadriceps (r = 0.63, p = 0.002) in the CKD group. Conclusion: Patients with CKD have altered pulmonary function, reduced peripheral muscle strength and functional capacity. (AU)

Reference values for pulmonary volumes by plethysmography in a Brazilian sample of white adults / Valores de referência para volumes pulmonares por pletismografia em uma amostra brasileira de adultos da raça branca

ABSTRACT Objective: To derive reference values for healthy white Brazilian adults who have never smoked and to compare the obtained values with reference values derived by Crapo and by Neder. Methods: Reference equations by quantile regressions were derived in 122 men and 122 women, non-obese, living in seven cities in Brazil. Age ranged from 21 to 92 years in women and from 25 to 88 years in men. Lung function tests were performed using SensorMedics automated body plethysmographies according ATS/ERS recommendations. Lower and upper limits were derived by specific equations for 5 and 95 percentiles. The results were compared to those suggested by Crapo in 1982, and Neder in 1999. Results: Median values for total lung capacity (TLC) were influenced only by stature in men, and by stature and age in women. Residual volume was influenced by age and stature in both genders. Weight was directly related to inspiratory capacity and inversely with functional residual capacity and expiratory reserve volume in both genders. A comparison of observed TLC data with values predicted by Neder equations showed significant lower values by the present data. Mean values were similar between data from present study and those derived by Crapo. Conclusion: New predicted values for lung volumes were obtained in a sample of white Brazilians. The values differ from those derived by Neder, but are similar to those derived by Crapo.

RESUMO Objetivo: Derivar valores de referência para brasileiros adultos brancos saudáveis que nunca fumaram e comparar os valores obtidos com os valores de referência derivados por Crapo e por Neder. Métodos: Equações de referência por regressões quantílicas foram derivadas em 122 homens e 122 mulheres, não obesos, em sete cidades do Brasil. A idade variou entre 21 e 92 anos nas mulheres e de 25 a 88 anos nos homens. Os volumes pulmonares foram medidos por pletismógrafo de corpo automatizados SensorMedics, de acordo com as recomendações da SBPT e ATS/ERS. Os limites inferior e superior, expressos pelo percentil 5 e 95, foram derivados por equações específicas. Os resultados foram comparados aos sugeridos por Crapo em 1982 e Neder em 1999. Resultados: Os valores medianos para a capacidade pulmonar total (CPT) foram influenciados apenas pela estatura nos homens, e pela estatura e idade nas mulheres. O volume residual foi influenciado pela idade e estatura em ambos os sexos. O peso se correlacionou diretamente com a capacidade inspiratória e inversamente com a capacidade residual funcional e com o volume de reserva expiratório em ambos os sexos. A CPT observada, comparada com os valores previstos pela equação de Neder, foi significativamente menor. Os valores médios foram semelhantes entre os dados do presente estudo e os de Crapo. Conclusões: Novos valores previstos para os volumes pulmonares foram obtidos em uma amostra de brasileiros de raça branca. Os valores diferem daqueles derivados por Neder, mas são semelhantes aos derivados por Crapo.

Vascular and ventilatory mechanical responses in three different stages of pulmonary development in the rabbit model of congenital diaphragmatic hernia

Abstract Purpose: To evaluate the vascular ventilatory response in different stages of lung development and to compare them to the neonates with congenital diaphragmatic hernia (CDH) in a rabbit model. Methods: New Zealand rabbits were divided into 8 groups (n=5): E25, E27, E30, and CDH. All groups were ventilated on a FlexiVent (Scireq, Montreal, QC, Canada), compounding the other 4 groups. The CDH surgery was performed at E25 and the harvest at E30. Dynamic compliance (CRS), dynamic elastance (ERS) and dynamic resistance (RRS) were measured every 4 min/24 min. Median wall thickness (MWT) and airspace were measured. ANOVA Bonferroni tests were used to perform statistical analysis. Significance was considered when p<0.05. Results: CRS was higher in E30 compared to all other groups (p<0.05). CRS and RRS of CDH and E27 were similar and were higher in E25 (p<0.05). MWT was decreased according to the gestational age, was increased in E27V and E30V (p<0.05) and decreased in CDHV (p<0.05), airspace was decreased in E25 and increased in all ventilated groups (p<0.05). Conclusions: The ventilation response of congenital diaphragmatic hernia is like the pseudoglandular stage of the lung development. These findings add information about the physiology of pulmonary ventilation in CDH.

Influência de variáveis espirométricas e transporte mucociliar na funcionalidade de tabagistas leves / Influence of spirometric variables and mucociliary transport on the functionality of light smokers

Introdução: O tabagismo provoca efeitos deletérios a saúde afetando o estado de saúde geral do indivíduo. Neste contexto, torna-se indispensável à avaliação da influência do fumo nas variáveis respiratórias e na capacidade funcional de tabagistas. Objetivo: Analisar a influência de variáveis espirométricas na capacidade de exercício de indivíduos tabagistas. Métodos: Estudo transversal com 78 indivíduos tabagistas, idade entre 40 e 60 anos, no qual foram avaliadas a função pulmonar (espirometria), a capacidade funcional (teste de caminhada de seis minutos-TC6) e a transportabilidade mucociliar nasal (teste do tempo de transporte da sacarina-TTS). Resultados: As variáveis espirométricas apresentaram correlação positiva significativa com o TC6 e o TTS não apresentou correlação com o TC6. Conclusão: A função pulmonar tem correlação com a capacidade funcional, no entanto o TTS não apresenta essa correlação em indivíduos tabagistas leves.

Introduction: Smoking causes deleterious health effects affecting the general health of the individual. In this context, it is essential to evaluate the influence of smoking on respiratory variables and on the functional capacity of smokers. Objective: To analyze the influence of spirometry variables on the exercise capacity of smokers. Methods: A cross-sectional study with 78 smokers, age between 40 and 60 years old, in which pulmonary function (spirometry), functional capacity (six-minute walk test ­ 6MWT) and nasal mucociliary transportability (Saccharin Transport Time Test ­ STT) were evaluated. Results: Spirometric variables had a significant postive correlation with the 6MWT and the STT did not present a correlation with the 6MWT. Conclusion: Pulmonary function correlated with functional capacity, however STT did not present this correlation in light smokers.

Nitrogen single-breath washout test for evaluating exercise tolerance and quality of life in patients with chronic obstructive pulmonary disease

Pulmonary function tests (PFTs) traditionally used in clinical practice do not accurately predict exercise intolerance in patients with chronic obstructive pulmonary disease (COPD). The aim of this study was to assess whether the nitrogen single-breath washout (N2SBW) test explains exercise intolerance and poor quality of life in stable COPD patients. This cross-sectional study included 31 patients with COPD subjected to PFTs (including the N2SBW test) and a cardiopulmonary exercise test (CPET). Patients were also evaluated using the following questionnaires: the COPD assessment test (CAT), the 36-Item Short Form Health Survey (SF36) and St. George's Respiratory Questionnaire (SGRQ). Peak oxygen uptake (peak VO2) was negatively correlated with the phase III slope of the N2SBW (SIIIN2) (r=-0.681, P<0.0001) and positively correlated with forced expiratory volume in one second (FEV1; r=0.441, P=0.013). Breathing reserve was negatively correlated with SIIIN2, closing volume/vital capacity, and residual volume (RV) (r=-0.799, P<0.0001; r=-0.471, P=0.007; r=-0.401, P=0.025, respectively) and positively correlated with FEV1, forced vital capacity (FVC) and FEV1/FVC (r=0.721; P<0.0001; r=0.592, P=0.0004; r=0.670, P<0.0001, respectively). SIIIN2 and CAT were independently predictive of VO2 and breathing reserve at peak exercise. RV, FVC, and FEV1 were independently predictive of the SF36-physical component summary, SF36-mental component summary, and breathing reserve, respectively. The SGRQ did not present any independent variables that could explain the model. In stable COPD patients, inhomogeneity of ventilation explains a large degree of exercise intolerance assessed by CPETs and, to a lesser extent, poor quality of life.

CT Quantification of Lungs and Airways in Normal Korean Subjects

OBJECTIVE: To measure and compare the quantitative parameters of the lungs and airways in Korean never-smokers and current or former smokers (“ever-smokers”). MATERIALS AND METHODS: Never-smokers (n = 119) and ever-smokers (n = 45) who had normal spirometry and visually normal chest computed tomography (CT) results were retrospectively enrolled in this study. For quantitative CT analyses, the low attenuation area (LAA) of LAA(I-950), LAA(E-856), CT attenuation value at the 15th percentile, mean lung attenuation (MLA), bronchial wall thickness of inner perimeter of a 10 mm diameter airway (Pi10), total lung capacity (TLC(CT)), and functional residual capacity (FRC(CT)) were calculated based on inspiratory and expiratory CT images. To compare the results between groups according to age, sex, and smoking history, independent t test, one way ANOVA, correlation test, and simple and multiple regression analyses were performed. RESULTS: The values of attenuation parameters and volume on inspiratory and expiratory quantitative computed tomography (QCT) were significantly different between males and females (p < 0.001). The MLA and the 15th percentile value on inspiratory QCT were significantly lower in the ever-smoker group than in the never-smoker group (p < 0.05). On expiratory QCT, all lung attenuation parameters were significantly different according to the age range (p < 0.05). Pi10 in ever-smokers was significantly correlated with forced expiratory volume in 1 second/forced vital capacity (r = −0.455, p = 0.003). In simple and multivariate regression analyses, TLC(CT), FRC(CT), and age showed significant associations with lung attenuation (p < 0.05), and only TLC(CT) was significantly associated with inspiratory Pi10. CONCLUSION: In Korean subjects with normal spirometry and visually normal chest CT, there may be significant differences in QCT parameters according to sex, age, and smoking history.

Relationship between Fractional Exhaled Nitric Oxide Level and Efficacy of Inhaled Corticosteroid in Asthma-COPD Overlap Syndrome Patients with Different Disease Severity

This study explored the relationship between the fractional exhaled nitric oxide (FeNO) level and the efficacy of inhaled corticosteroid (ICS) in asthma-chronic obstructive pulmonary disease (COPD) overlap syndrome (ACOS) patients with different disease severity. A total of 127 ACOS patients with ACOS (case group) and 131 healthy people (control group) were enrolled in this study. Based on the severity of COPD, the ACOS patients were divided into: mild ACOS; moderate ACOS; severe ACOS; and extremely severe ACOS groups. We compared FeNO levels, pulmonary function parameters including percentage of forced expiratory volume in 1 second (FEV1) to predicted value (FEV1%pred), ratio of FEV1 to forced vital capacity (FEV1/FVC), inspiratory capacity to total lung capacity (IC/TLC) and residual volume to total lung capacity (RV/TLC), arterial blood gas parameters, including PH, arterial partial pressure of oxygen (PaO₂) and arterial partial pressure of carbon dioxide (PaCO₂), total serum immunoglobulin E (IgE), induced sputum eosinophil (EOS), plasma surfactant protein A (SP-A), plasma soluble receptor for advanced glycation end products (sRAGE), sputum myeloperoxidase (MPO), sputum neutrophil gelatinase-associated lipocalin (NGAL) and Asthma Control Test (ACT) scores, and COPD Assessment Test (CAT) scores. Compared with pre-treatment parameters, the FeNO levels, RV/TLC, PaCO₂, total serum IgE, induced sputum EOS, plasma SP-A, sputum MPO, sputum NGAL, and CAT scores were significantly decreased after 6 months of ICS treatment, while FEV1%pred, FEV1/FVC, IC/TLC, PH, PaO₂, plasma sRAGE, and ACT scores were significantly increased in ACOS patients with different disease severity after 6 months of ICS treatment. This finding suggests that the FeNO level may accurately predict the efficacy of ICS in the treatment of ACOS patients.

Lung volumes and airway resistance in patients with a possible restrictive pattern on spirometry / Volumes pulmonares e resistência das vias aéreas em pacientes com possível padrão restritivo à espirometria

ABSTRACT Objective: Many patients with proportional reductions in FVC and FEV1 on spirometry show no reduction in TLC. The aim of this study was to evaluate the role that measuring lung volumes and airway resistance plays in the correct classification of patients with a possible restrictive pattern on spirometry. Methods: This was a prospective study involving adults with reduced FVC and FEV1, as well as an FEV1/FV(C) ratio within the predicted range. Restrictive lung disease (RLD) was characterized by TLC below the 5th percentile, as determined by plethysmography. Obstructive lung disease (OLD) was characterized by high specific airway resistance, significant changes in post-bronchodilator FEV1, or an FEF25-75% < 50% of predicted, together with a high RV/TLC ratio. Nonspecific lung disease (NLD) was characterized by TLC within the predicted range and no obstruction. Combined lung disease (CLD) was characterized by reduced TLC and findings indicative of airflow obstruction. Clinical diagnoses were based on clinical suspicion, a respiratory questionnaire, and the review of tests of interest. Results: We included 300 patients in the study, of whom 108 (36%) were diagnosed with RLD. In addition, 120 (40%) and 72 (24%) were diagnosed with OLD/CLD and NLD, respectively. Among the latter, 24 (33%) were clinically diagnosed with OLD. In this sample, 151 patients (50.3%) were obese, and obesity was associated with all patterns of lung disease. Conclusions: Measuring lung volumes and airway resistance is often necessary in order to provide an appropriate characterization of the pattern of lung disease in patients presenting with a spirometry pattern suggestive of restriction. Airflow obstruction is common in such cases.

RESUMO Objetivo: Muitos pacientes com redução proporcional de CVF e VEF1 na espirometria não têm CPT reduzida. O objetivo deste estudo foi avaliar o papel da medida dos volumes pulmonares e da resistência das vias aéreas para a classificação correta de pacientes com possível restrição à espirometria. Métodos: Estudo prospectivo de adultos com CVF e VEF1 reduzidos e relação VEF1/CV(F) na faixa prevista. Distúrbio ventilatório restritivo (DVR) foi definido por CPT < 5º percentil por pletismografia. Distúrbio ventilatório obstrutivo (DVO) foi caracterizado por resistência específica de vias aéreas elevada, resposta significativa do VEF1 pós-broncodilatador e/ou um FEF25-75% < 50% do previsto associado a uma relação VR/CPT elevada. Distúrbio ventilatório inespecífico (DVI) foi caracterizado por CPT na faixa prevista e ausência de obstrução. Distúrbio ventilatório combinado (DVC) foi caracterizado por CPT reduzida e achados indicativos de obstrução ao fluxo aéreo. Os diagnósticos clínicos foram baseados em suspeita clínica, um questionário respiratório e revisão de exames de interesse. Resultados: Foram incluídos 300 pacientes no estudo, dos quais 108 (36%) tiveram diagnóstico de DVR, enquanto 120 (40%) foram diagnosticados com DVO ou DVC e 72 (24%) com DVI. Destes últimos, 24 (33%) tinham diagnóstico clínico de DVO. Nesta amostra, 151 pacientes (50,3%) eram obesos, e isso se associou com todos os padrões de distúrbios funcionais. Conclusões: Medidas dos volumes pulmonares e da resistência das vias aéreas são frequentemente necessárias para a caracterização adequada do tipo de distúrbio funcional em casos com possível restrição à espirometria. A obstrução ao fluxo aéreo é comum nesses casos.

Comparative analysis of lung function of rats using a new intubation technique and tracheostomy / Análise comparativa da função pulmonar de ratos usando uma nova técnica de intubação e a traqueostomia

Several studies use intubation or tracheostomy for data collection in lung function of rats. Due to the difficulty of performing intubation, tracheostomy is most commonly used. Knowing this difficulty, this paper demonstrates a new way to perform the intubation technique and compares pulmonary function variables obtained using intubation or tracheostomy. For the analysis of our new technique of intubation, 30 rats were used, and the comparative analysis of lung function data obtained through the use of our technique of intubation and tracheostomy, 16 rats were used, divided into two groups. The T group underwent tracheostomy. The IT group underwent initial intubation and, awaiting recovery, a week later was again subjected to intubation group, which was then called IT-1W. Our intubation technique is performed with the aid of a wedge, inclined bed and percutaneous transillumination. No animals died during the intubation procedure, and about 77% of the animals were intubated at the first attempt. We did not obtain statistically significant differences in the pulmonary function variables between the groups. Our intubation technique is easily learned and reproduced. The implications of such a technique can be generalized to all laboratories dealing with intubation of rats.(AU)

Vários estudos utilizam a intubação orotraqueal ou traqueostomia para coleta de dados na função pulmonar de ratos. Devido à dificuldade de realização da intubação, a traqueostomia é mais comumente utilizada. Conhecendo esta dificuldade, este trabalho demonstra uma nova maneira de realizar a técnica de intubação e compara as variáveis de função pulmonar obtidas por intubação ou traqueostomia. Para a análise de nossa nova técnica de intubação, foram utilizados 30 ratos, e para a análise comparativa dos dados da função pulmonar obtidos pelo uso de nossa técnica de intubação e traqueotomia, 16 ratos foram utilizados, divididos em dois grupos. O grupo T foi submetido a traqueostomia. O grupo de IT foi submetido inicialmente a intubação e, esperada sua recuperação, uma semana depois foi novamente submetido a intubação, que foi então chamado de grupo IT-1W. Nossa técnica de intubação é realizada com a ajuda de uma cunha, cama inclinada e transiluminação percutânea. Nenhum animal morreu durante o procedimento de intubação, e cerca de 77% dos animais foram intubados na primeira tentativa. Não foram obtidas diferenças estatisticamente significativas nas variáveis de função pulmonar entre os grupos. Nossa técnica de intubação é facilmente aprendida e reproduzida. As implicações de tal técnica podem ser generalizadas para todos os laboratórios que lidam com a intubação de ratos.(AU)

Aging of the respiratory system / 고신대학교의과대학학술지

Changes in the respiratory system caused by aging generally include structural changes in the thoracic cage and lung parenchyma, abnormal findings on lung function tests, ventilation and gas exchange abnormalities, decreased exercise capacity, and reduced respiratory muscle strength. Decreased respiratory system compliance caused by reduced elastic recoil of the lung parenchymaand thoracic cage is related to decreased energy expenditure by the respiratory system. Lung function, as measured by 1-second forced expiratory volume and forced vital capacity (FVC), decreases with age, whereas total lung capacity remains unchanged. FVC decreases because of increased residual volume and diffusion capacity also decreases. Increased physiological dead space and ventilation/perfusion imbalance may reduce blood oxygen levels and increase the alveolar-arterial oxygen difference. More than 20% decrease in diaphragmstrength is thought to beassociated withaging-related muscle atrophy. Ventilation per minute remains unchanged, and blood carbon dioxide concentration does not increase with aging. However, responses to hypoxia and hypercapnia are decreased. Exercise capacity also decreases, and maximum oxygen consumption decreases by >1%/year. Consequence of these changes, many respiratory diseases occur with aging. Thus, it is important to recognize these aging-related respiratory system changes.

Comparison of Predicted Total Lung Capacity and Total Lung Capacity by Computed Tomography in Lung Transplantation Candidates

PURPOSE: Lung size mismatch is a major cause of poor lung function and worse survival after lung transplantation (LTx). We compared predicted total lung capacity (pTLC) and TLC measured by chest computed tomography (TLC(CT)) in LTx candidates. MATERIALS AND METHODS: We reviewed the medical records of patients on waiting lists for LTx. According to the results of pulmonary function tests, patients were divided into an obstructive disease group and restrictive disease group. The differences between pTLC calculated using the equation of the European Respiratory Society and TLC(CT) were analyzed in each group. RESULTS: Ninety two patients met the criteria. Thirty five patients were included in the obstructive disease group, and 57 patients were included in the restrictive disease group. pTLC in the obstructive disease group (5.50±1.07 L) and restrictive disease group (5.57±1.03 L) had no statistical significance (p=0.747), while TLC(CT) in the restrictive disease group (3.17±1.15 L) was smaller than that I the obstructive disease group (4.21±1.38 L) (p<0.0001). TLC(CT)/pTLC was 0.770 in the obstructive disease group and 0.571 in the restrictive disease group. CONCLUSION: Regardless of pulmonary disease pattern, TLC(CT) was smaller than pTLC, and it was more apparent in restrictive lung disease. Therefore, we should consider the difference between TLC(CT) and pTLC, as well as lung disease patterns of candidates, in lung size matching for LTx.

Validation of scores of use of inhalation devices: valoration of errors / Validação de escores de uso de dispositivos para inalação: valoração dos erros cometidos

AbstractObjective: To validate two scores quantifying the ability of patients to use metered dose inhalers (MDIs) or dry powder inhalers (DPIs); to identify the most common errors made during their use; and to identify the patients in need of an educational program for the use of these devices.Methods: This study was conducted in three phases: validation of the reliability of the inhaler technique scores; validation of the contents of the two scores using a convenience sample; and testing for criterion validation and discriminant validation of these instruments in patients who met the inclusion criteria.Results: The convenience sample comprised 16 patients. Interobserver disagreement was found in 19% and 25% of the DPI and MDI scores, respectively. After expert analysis on the subject, the scores were modified and were applied in 72 patients. The most relevant difficulty encountered during the use of both types of devices was the maintenance of total lung capacity after a deep inhalation. The degree of correlation of the scores by observer was 0.97 (p < 0.0001). There was good interobserver agreement in the classification of patients as able/not able to use a DPI (50%/50% and 52%/58%; p < 0.01) and an MDI (49%/51% and 54%/46%; p < 0.05).Conclusions: The validated scores allow the identification and correction of inhaler technique errors during consultations and, as a result, improvement in the management of inhalation devices.

ResumoObjetivo: Validar dois escores para medir a habilidade de pacientes em utilizar inaladores pressurizados (IPs) ou inaladores de pó (IPos), verificar os erros mais comuns na sua utilização e identificar os pacientes que necessitam de um programa educacional para o uso desses dispositivos.Métodos: Este estudo foi realizado em três etapas: validação da confiabilidade dos escores de uso dos dispositivos inalatórios; validação do conteúdo dos escores utilizando-se uma amostra de conveniência; e realização de testes para a validação de critério e a validação discriminante desses instrumentos em pacientes que preenchiam os critérios de inclusão do estudo.Resultados: A amostra de conveniência foi composta por 16 pacientes, e houve discordância interobservador em 19% e 25% para os escores de IPo e IP, respectivamente. Após a análise de expertos no assunto, os escores sofreram modificações e foram aplicados em 72 pacientes. A dificuldade mais relevante no uso de ambos os dispositivos foi a manutenção da capacidade pulmonar total após inspiração profunda. O grau de correlação dos escores por observador foi de 0,97 (p < 0,0001). Houve boa concordância interobservador na classificação dos pacientes como aptos/não aptos para uso de IPo (50%/50% e 52%/58%; p < 0,01) e de IP (49%/51% e 54%/46%; p < 0,05).Conclusões: Os escores validados permitem identificar e corrigir os erros da técnica inalatória ao longo das consultas e, em consequência, melhorar o manejo dos dispositivos para inalação.

The Prognostic Value of Residual Volume/Total Lung Capacity in Patients with Chronic Obstructive Pulmonary Disease

The prognostic role of resting pulmonary hyperinflation as measured by residual volume (RV)/total lung capacity (TLC) in chronic obstructive pulmonary disease (COPD) remains poorly understood. Therefore, this study aimed to identify the factors related to resting pulmonary hyperinflation in COPD and to determine whether resting pulmonary hyperinflation is a prognostic factor in COPD. In total, 353 patients with COPD in the Korean Obstructive Lung Disease cohort recruited from 16 hospitals were enrolled. Resting pulmonary hyperinflation was defined as RV/TLC > or = 40%. Multivariate logistic regression analysis demonstrated that older age (P = 0.001), lower forced expiratory volume in 1 second (FEV1) (P < 0.001), higher St. George Respiratory Questionnaire (SGRQ) score (P = 0.019), and higher emphysema index (P = 0.010) were associated independently with resting hyperinflation. Multivariate Cox regression model that included age, gender, dyspnea scale, SGRQ, RV/TLC, and 6-min walking distance revealed that an older age (HR = 1.07, P = 0.027), a higher RV/TLC (HR = 1.04, P = 0.025), and a shorter 6-min walking distance (HR = 0.99, P < 0.001) were independent predictors of all-cause mortality. Our data showed that older age, higher emphysema index, higher SGRQ score, and lower FEV1 were associated independently with resting pulmonary hyperinflation in COPD. RV/TLC is an independent risk factor for all-cause mortality in COPD.

Obesity and lung function: a systematic review / Obesidade e função pulmonar: uma revisão sistemática

Obesity is a chronic disease characterized by the excessive accumulation of body fat that is harmful to the individuals. Respiratory disorders are among the comorbidities associated with obesity. This study had the objective of investigating the alterations in respiratory function that affect obese individuals. A systematic review was performed, by selecting publications in the science databases MEDLINE and LILACS, using PubMed and SciELO. The articles that assessed pulmonary function by plethysmography and/or spirometry in obese individuals aged under 18 years were included. The results demonstrated that the obese individuals presented with a reduction in lung volume and capacity as compared to healthy individuals. Reduction of total lung capacity and reduction of forced vital capacity, accompanied by reduction of the forced expiratory volume after one second were the most representative findings in the samples. The articles analyzed proved the presence of a restrictive respiratory pattern associated with obesity.

A obesidade é uma doença crônica, caracterizada pelo acúmulo excessivo de gordura corporal, que ocasiona prejuízos ao indivíduo. Dentre as comorbidades associadas à obesidade, estão as disfunções respiratórias. O presente estudo teve por objetivo investigar as alterações da função pulmonar que acometem indivíduos obesos. Foi realizada uma revisão sistemática, por meio da seleção de publicações nas bases científicas de dados MEDLINE e LILACS, por meio do PubMed e SciELO. Foram inclusos os trabalhos que avaliaram a função pulmonar, por meio de pletismografia e/ou espirometria, em indivíduos obesos maiores de 18 anos. Os resultados demonstraram que os indivíduos obesos apresentaram redução dos volumes e capacidades pulmonares quando comparados a indivíduos eutróficos. Redução da capacidade pulmonar total e redução da capacidade vital forçada, acompanhadas de redução do volume expiratório forçado após um segundo, foram os achados mais representativos dentre as amostras. Os trabalhos analisados comprovam a presença de padrão respiratório restritivo associado à obesidade.

Level of physical activity and functional in athletes children

A melhora da aptidão física e desempenho funcional da criança são aquisições próprias da prática da atividade física, porém os estudos que tratam da repercussão das modalidades esportivas sobre a capacidade funcional e de músculos respiratórios em crianças são ainda escassos. Objetivo: verificar a força muscular respiratória, o nível de atividade física e funcional de crianças atletas, comparadas a crianças não atletas, na mesma faixa etária. Método: participaram do estudo 20 crianças provenientes de escolas (grupo não-atletas, GNA, n = 10), e centros de treinamento esportivo (grupo atletas, GA n = 10) da região de Florianópolis-SC, com idades entre 7 e 10 anos. Foi aplicado o Questionário Internacional de Atividade Física (IPAQ) e avaliadas a força muscular respiratória (FMR) por manuvacuometria (MVD-300, Microhard) e capacidade funcional por teste de caminhada de seis minutos (TC6). Resultados: A força muscular respiratória e de capacidade funcional não diferiram entre os grupos. Encontrada diferença na frequência cardíaca do terceiro minuto, entre o primeiro e segundo TC 6, nos dois grupos – GA: 91,20±7,57 e 129,20±33,81 (p=0,005); GS de 96,10 ± 1,45 e 122,00 ± 22,62 (p = 0,008). Diferiu entre os grupos a escala de dispnéia no início do segundo TC 6, maior no GS (0,6 ± 0,65 x 0,10 ± 0,31;p = 0,029). Características do nível de atividade física, avaliadas através do IPAQ, foram diferentes nos grupos.Conclusão: as crianças atletas e não-atletas estudadas apresentaram força muscular respiratória e capacidade funcional semelhantes, sendo relevante a ampliação do tamanho amostral para sensibilizar a identificação de novos resultados...

The improvement of physical ability and functional performance of children are acquisitions of physical activity, but studies about the impact of sports on functional capacity and respiratorymuscles in children are still scarce. Objective: to assess the respiratory muscle strength, the functional and physical activity levels of athletes children when compared with no athletes children, both in the same age group. Methods: the study involved 20 children from schools (non-athletesgroup, NAGN n = 10), and sports training centers (athletes group, AG n = 10) from Florianópolis- SC/Brazil, aged between 7 and 10 years. We used the International Physical Activity Questionnaire (IPAQ) and evaluated the respiratory muscle strength (RMS) with a manuvacuometer (MVD-300, Microhard). The functional capacity was evaluated with the six minute walking test (6MWT). Results: respiratory muscle strength and functional capacity did not differ between groups. Differences were found in heart rate in the third minute, between the first and second 6MWT in both groups - GA: 91.20 ± 7.57 and 129.20 ± 33.81 (p = 0.005) and NAG: 96,10±1,45 e 122,00 ± 22,62 (p = 0,008). Dyspnea scale was different between two groups on the beginning of second 6MWT, bigger in NAG group (0.6 ± 0.65 x 0.10 ± 0.31, p = 0.029). Characteristics of physical activity, assessed by IPAQ were different between groups. Conclusion: the athletes and non-athletes children presented similar respiratory muscle strength and functional capacity. A bigger sample is relevant to accomplish new outcomes...

Respiratory muscle strength of Brazilian adolescents: obtained and predicted values

OBJECTIVES: To compare the obtained values for maximal respiratory pressures of a sample of Brazilian adolescents with the values predicted by Wilson et al. and Domènech-Clar et al. METHODS: 156 adolescents (84 boys) aged between 12 and 17 years were assessed. Maximal respiratory pressures were assessed by a digital manometer with the adolescents in the seated position and wearing a nose clip. Maximal inspiratory and expiratory pressures were performed from residual volume and total lung capacity, respectively. Comparison of the values of maximal respiratory pressures obtained in this study with those predicted by the equations proposed by Wilson et al. and Domenèch-Clar et al., was performed by the paired Student's t test. To verify the association between these values, the Pearson's correlation test was used. RESULTS: Mean maximal inspiratory pressure was 74,66 ± 22,95 cm H2O and 103,52 ± 25,67 cm H2O for girls and boys, respectively. Mean maximal expiratory pressure was 86,23 ± 25,92 cm H2O and 120,08 ± 27,37 cm H2O for girls and boys, respectively. The values obtained by this study did not differ and also did not significantly correlate with those predicted by the equations proposed by Wilson et al., e Domènech-Claret al. CONCLUSIONS: The equations proposed by Wilson et al. and Domènech-Clar et al. were not successful in predicting the values for maximal respiratory pressures in the population studied, indicating the necessity of using in clinical practice reference values from a healthy population of the same ethnicity...

OBJETIVOS: Comparar os valores encontrados para as pressões respiratórias máximas de uma amostra de adolescentes brasileiros com os valores preditos por Wilson et al e Domènech-Clar et al. MÉTODO: Foram avaliados 156 adolescentes (84 meninos) entre 12 e 17 anos. As pressões respiratórias máximas foram avaliadas por meio de um manovacuômetro digital com os adolescentes sentados e utilizando um clipe nasal. As avaliações das pressões inspiratória e expiratória máximas foram realizadas a partir do volume residual e da capacidade pulmonar total, respectivamente. A comparação dos valores das pressões respiratórias máximas obtidos no atual estudo com os preditos pelas equações propostas por Wilson et al e Domènech-Clar et al, foi realizada pelo teste t de Student pareado. Para verificar a associação entre estes valores, foi utilizado o teste de correlação de Pearson. RESULTADOS: A média da pressão inspiratória máxima foi de 74,66 ± 22,95 cm H2O e de 103,52 ± 25,67 cm H2O para meninas e meninos, respectivamente. A média da pressão expiratória máxima foi de 86,23 ± 25,92 cm H2O e de 120,08 ± 27,37 cm H2O para meninas e meninos, respectivamente. Os valores obtidos não diferiram e também não se correlacionaram significativamente com os preditos através das equações propostas por Wilson et al., e Domènech-Clar et al. CONCLUSÕES: As equações propostas por Wilson et al. e Domènech-Clar et al., não foram capazes de predizer os valores das pressões respiratórias máximas na população estudada, indicando a necessidade de se usar na prática clínica valores de referência advindos de uma população saudável de mesma etnia...

Montelukast improves air trapping, not airway remodeling, in patients with moderate-to-severe asthma: a pilot study / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>Evidence has demonstrated that the distal lung, which includes airways of < 2 mm in diameter and lung parenchyma, constitutes an important component of asthma pathology. Cysteinyl leukotrienes (CysLTs) are potent proinflammatory mediators and bronchoconstrictors involved in the asthmatic process. Guidelines recommend the leukotriene-modifying agents for asthma treatment. We hypothesized that a leukotriene receptor antagonist with an inhaled corticosteroid (ICS) and long-acting β2 agonist (LABA) combination would improve small airways function in moderate-to- severe asthmatics evaluated by physiological tests and high-resolution computed tomography (HRCT) analysis. This study was performed at a tertiary university hospital in Beijing.</p><p><b>METHODS</b>This was a randomized, double-blind, parallel study performed in 38 patients with moderate-to-severe asthma treated with salmeterol/futicasone (SFC) plus montelukast (SFC+M) or SFC plus placebo over 24 weeks. Small airway function was assessed by physiological studies and HRCT image analysis.</p><p><b>RESULTS</b>Montelukast significantly improved air trapping as expressed by the residual volume (RV)/total lung capacity (TLC). Over 24 weeks of treatment, RV/TLC was improved by (15.41 ± 6.67)% in patients receiving SFC+M while RV/TLC was decreased by (8.57 ± 10.26)% in patients receiving SFC alone, the difference between the two groups was significant (P = 0.02). There was a trend towards a significant difference in forced expiratory volume in the first second (FEV1)/forced vital capacity (FVC) in the SFC+M group compared to that in the SFC group ((17.87 ± 8.17)% vs. (12.28 ± 9.20)%, P = 0.056). There was no significant change in percentage wall area (WA%) after 24 weeks of add-on treatment with montelukast. Patients receiving SFC+M showed significant improvement in the ratio of CT-determined values at full expiration to those at full inspiration (E/I ratio) (0.894 ± 0.005 vs. 0.871 ± 0.003, P = 0.002).</p><p><b>CONCLUSION</b>We have shown, using lung function tests and HRCT image technique, that add-on therapy with montelukast improves distal lung function reflected by air trapping, but not airway wall thickness in moderate-to-severe asthma.</p>