Respiratory system parameters in children with low severity cystic fibrosis: is there early involvement in relation to healthy peers? / Parâmetros do sistema respiratório em crianças com fibrose cística de baixa gravidade: há acometimento precoce em relação a pares saudáveis?

ABSTRACT Objective: To compare and analyze pulmonary function and respiratory mechanics parameters between healthy children and children with cystic fibrosis. Methods: This cross-sectional analytical study included healthy children (HSG) and children with cystic fibrosis (CFG), aged 6-13 years, from teaching institutions and a reference center for cystic fibrosis in Florianópolis/SC, Brazil. The patients were paired by age and sex. Initially, an anthropometric evaluation was undertaken to pair the sample characteristics in both groups; the medical records of CFG were consulted for bacterial colonization, genotype, and disease severity (Schwachman-Doershuk Score — SDS) data. Spirometry and impulse oscillometry were used to assess pulmonary function. Results: In total, 110 children were included, 55 in each group. In the CFG group, 58.2% were classified as excellent by SDS, 49.1% showed the ΔF508 heterozygotic genotype, and 67.3% were colonized by some pathogens. Statistical analysis revealed significant differences between both groups (p<0.05) in most pulmonary function parameters and respiratory mechanics. Conclusions: Children with cystic fibrosis showed obstructive ventilatory disorders and compromised peripheral airways compared with healthy children. These findings reinforce the early changes in pulmonary function and mechanics associated with this disease.

RESUMO Objetivo: Comparar e analisar parâmetros de função pulmonar e de mecânica respiratória entre escolares saudáveis e com fibrose cística (FC). Métodos: Estudo transversal que incluiu escolares saudáveis (GES) e com FC (GFC), com idades entre seis e 13 anos, provenientes de instituições de ensino e de um centro de referência da FC em Florianópolis/SC, Brasil, pareados por idade e sexo, respectivamente. Inicialmente, conduziu-se avaliação antropométrica para pareamento e caracterização de ambos os grupos e, no GFC, consultou-se prontuário médico para registro dos dados de colonização bacteriana, genótipo e gravidade da doença (Escore de Schwachman-Doershuk — ESD). Para a avaliação da função pulmonar, realizou-se espirometria e a avaliação da mecânica respiratória foi conduzida por meio do sistema de oscilometria de impulso. Resultados: Participaram 110 escolares, 55 em cada grupo. No GFC, 58,2% foram classificados pelo ESD como excelentes, 49,1% apresentaram genótipo ∆F508 heterozigoto e 67,3% eram colonizados por alguma patógeno. Houve diferença significativa (p<0,05) na maioria dos parâmetros de função pulmonar e de mecânica respiratória entre os grupos. Conclusões: Escolares com FC apresentaram distúrbio ventilatório obstrutivo e com comprometimento de vias aéreas periféricas, em comparação aos escolares hígidos. Esse evento reforça o início precoce da alteração de função pulmonar e de mecânica respiratória nessa enfermidade, evidenciados pelos achados desta investigação.

Valores de referencia de espirometría forzada de adultos residentes sobre o bajo 1500 m s. n. m.: revisión sistemática

Introducción: La espirometría es una prueba de función pulmonar usada en la valoración de programas de rehabilitación para evaluar exposiciones a tóxicos y alérgenos, en estudios epidemiológicos y en el desarrollo de ecuaciones de referencia en poblaciones específicas; estos valores pueden variar de acuerdo con la altura. Objetivo: Establecer las diferencias entre los valores de referencia de espirometría forzada en población adulta residentes en alturas mayores y menores a 1500 metros sobre el nivel del mar. Métodos: Revisión sistemática, se encontraron 536 estudios, se evaluaron 66 en texto completo, 33 en calidad metodológica con las listas de chequeo Quality Assessment Tool for Observational Cohort and Cross-Sectional Studies y Quality Assessment of Case-Control Studies; 21 estudios fueron seleccionados para la revisión y 12 surtieron metanálisis. Resultados: Se contó con 48 923 participantes de alturas entre 2,4 y 4440 m s. n. m. Hay diferencias iniciales al relacionar la altura (+/-1500 m s. n. m) con el VEF1 (hombres: DM 0,29; IC: 0,03-0,55; mujeres: DM 0,27; IC: -0,07-0,60) y los valores de referencia con el sexo: CVF (DM 1,31; IC: 1,24-1,37) y VEF1 (DM: 1,03; IC: 0,95-1,11). Se reportó alta heterogeneidad y riesgo de sesgo de publicación. Discusión: Estas diferencias se dan en función de aspectos antropométricos y fisiológicos como la aclimatación y el envejecimiento pulmonar. Los mecanismos que influyen en estos cambios son la adaptación genética, molecular, fisiológica y anatómica, que permiten compensar los efectos de la hipoxia aguda o crónica, lo cual aumenta la ventilación alveolar y los valores espirométricos. Conclusiones: Los valores de referencia de espirometría varían de acuerdo con la altura (mayores en alturas > 1500 m s. n. m) y el sexo (más elevados en hombres). Es necesario contar con evidencias más amplias y contundentes en la temática.

Introduction: Spirometry is a lung function test used in the evaluation of rehabilitation programs to evaluate exposures to toxics and allergens in epidemiological studies and in the development of reference equations in specific populations; these values may vary according to height. Objective: To establish the differences between the reference values of forced spirometry in the adult population living at altitudes greater than and less than 1,500 meters above sea level. Methods: Systematic review a total of 536 studies were found; 66 were assessed in full text and 33 were assessed for methodological quality using the Quality Assessment Tool for Observational Cohort and Cross-Sectional Studies and Quality Assessment of Case-Control Studies checklists; 21 studies were selected for the review and 12 provided meta-analyses. Results: There were 48,923 participants from heights between 2.4 and 4,440 m.a.s.l. There are initial differences when relating height (+/-1,500 m.a.s.l.) with FEV1 (men: MD 0.29; CI: 0.03-0.55; women: MD 0.27; CI: -0.07-0 .60); and the reference values with gender: FVC (MD 1.31, CI: 1.24-1.37) and FEV1 (MD: 1.03, CI: 0.95-1.11). High heterogeneity and risk of publication bias are reported. Discussion: These differences occur based on anthropometric and physiological aspects such as acclimatization and lung aging. The mechanisms that influence these changes are genetic, molecular, physiological and anatomical adaptations that allow compensation for the effects of acute or chronic hypoxia, which increases alveolar ventilation and spirometric values. Conclusions: The spirometry reference values vary according to height (higher at heights >1,500 m.a.s.l.) and sex (higher in men). It is necessary to have broader and more convincing evidence on the subject.

Parâmetros espirométricos podem predizer a incidência de fragilidade em pessoas idosas? / Can spirometric parameters predict the incidence of frailty in the elderly people?

Objetivo: Verificar a associação entre indicadores espirométricos e a incidência da síndrome de fragilidade em pessoas idosas. Métodos: Trata-se de um estudo com delineamento longitudinal realizado em 2014-2019, com uma amostra de estudo de 104 pessoas idosas. A variável dependente foi a síndrome de fragilidade, avaliada por meio do fenótipo de Fried et al. e as variáveis independentes foram os indicadores espirométricos, sendo eles a Capacidade Vital Forçada (CVF), Pico de Fluxo Expiratório (PFE), Volume Expiratório Forçado no primeiro segundo (VEF1), relação VEF1/CVF e o Fluxo Expiratório Forçado 25%-75% (FEF25-75%). Resultados: A incidência de pessoas idosas frágeis foi de 16,3% em ambos os sexos, sendo que o sexo masculino apresentou melhores indicadores de função pulmonar que as mulheres. Apesar disso, observamos que não houve associação entre a síndrome de fragilidade e os indicadores espirométricos (p>0,05). Conclusão: Os indicadores espirométricos não são preditores de fragilidade em pessoas idosas residentes na comunidade, após cinco anos de seguimento.

Objective: To verify the association between spirometric indicators and the incidence of frailty syndrome in elderly people. Methods: This is a study with a longitudinal design carried out in 2014-2019, with a study sample of 104 elderly people. The dependent variable was the frailty syndrome, assessed using the phenotype of Fried et al. and the independent variables were the spirometric indicators, namely Forced Vital Capacity (FVC), Peak Expiratory Flow (PEF), Forced Expiratory Volume in one second (FEV1), FEV1/FVC ratio and Forced Expiratory Flow 25%-75 % (FEF25-75%). Results: The incidence of frail elderly people was 16.3% in both genders, with males presenting better lung function indicators than females. Despite this, we observed that there was no association between the frailty syndrome and the spirometric indicators (p>0.05). Conclusion: Spirometric indicators are not predictors of frailty in community-dwelling elderly people after five years of follow-up.

Lung Function Tests in Infants and Children

Lung function testing is an essential modality of investigation in children as it provides objective evidence of lung disease/ health. With advances in technology, various tests are available that can aid in the diagnosis of lung disease, assess the progression and response to therapy and document the lung development and evolving lung diseases in infants. This narrative review discusses lung function tests in infants and children. Currently, lung function tests can be performed in every age group, from neonates to the elderly. Spirometry and peak expiratory flow rate (PEFR) are the most employed tests in children more than six years of age. Spirometry helps diagnose and monitoring of both obstructive and restrictive diseases. There is a need for expertise to perform and interpret spirometry correctly. The forced oscillation technique (FOT) or impulse oscillometry (IOS) is done with tidal volume breathing and is feasible even in preschool children. Their utility is mainly restricted to asthma in children at present. Lung function tests can be performed in neonates, infants and children using infant pulmonary function test (PFT) equipment, although their availability is limited. Diffusion capacity for carbon monoxide (DLCO) is a valuable tool in restrictive lung diseases. Lung volumes can be assessed by body plethysmography and multiple washout technique. The latter can also assess lung clearance index. It is essential to perform and interpret the lung function test results correctly and correlate them with the clinical condition for optimum treatment and outcome.

Ecuación de referencia espirométrica en varones de 2 regiones del norte peruano ubicadas entre 0 a 100 metros sobre el nivel del mar: Estudio transversal

Objetivo: Determinar los valores de referencia de espirometría y formular una ecuación de predicción de valores espirométricos en población económicamente activa (PEA) de regiones con altitud 0-100 m.s.n.m. Métodos: Se seleccionaron a los participantes del estudio considerando los criterios de selección del estudio. Se recogió la información sobre las variables consideradas en el estudio: Capacidad Vital Forzada (CVF) y Volumen Espiratorio Forzado en el primer Segundo (VEF1), datos sociodemográficos y medidas antropométricas. Se dividió a la muestra en dos grupos para poder formular la ecuación de referencia y para evaluar su confiabilidad en un subgrupo de validación mediante las pruebas de correlación intraclase, T de Student para muestras pareadas y los gráficos de Bland-Altman. Resultados: Se seleccionaron 1052 participantes varones. Los rangos normales de CVF y VEF1 calculados fueron de CVF de 3.48 -5.47 y VEF1 de 2.83 - 4.41. Mediante una regresión lineal múltiple, se obtuvieron las siguientes fórmulas: CVF = 2.206 - 0.131 (Altitud Geográfica) - 0.014 (Edad) + 0.045 (Talla) y VEF1 = 1.589 - 0.08 (Altitud Geográfica) - 0.015 (Edad) + 0.033 (Talla). En los análisis de confiabilidad, se encontró una diferencia estadísticamente significativa en las medias entre los valores predichos por la ecuación y los valores reales, aunque en los gráficos de Bland-Altman no se evidenció un sesgo significativo y los coeficientes de correlación intraclase (CVF-ICC: 0.69; VEF1-ICC: 0.70) se encontraban dentro de un rango adecuado. Conclusiones: Las ecuaciones de CVF y VEF1 desarrolladas permiten predecir adecuadamente los valores espirométricos en PEA masculina de las regiones incluidas en el estudio.

Objective: Determine the spirometry reference values and formulate an equation to predict spirometric values in the economically active population (EAP) in regions with an altitude of 0-100 m.a.s.l. Materials and Methods: Study participants were selected considering the study selection criteria. Information was collected on the variables considered in the study: Forced Vital Capacity (FVC) and Forced Expiratory Volume in the first second (FEV1), sociodemographic data and anthropometric measurements. The sample was divided into 2 groups to be able to formulate the reference equation and to assess its reliability in a validation subgroup using intraclass correlation tests, Student's t-test for paired samples, and Bland-Altman plots. Results: 1052 male participants were selected. The normal ranges for FVC and FEV1 calculated were FVC 3.48 - 5.47 and FEV1 2.83 - 4.41. Using multiple linear regression, the following formulas were obtained: FVC = 2.206 - 0.131 (Geographic Altitude) - 0.014 (Age) + 0.045 (Height) and FEV1 = 1.589 - 0.08 (Geographic Altitude) - 0.015 (Age) + 0.033 (Height). In the reliability analyses, a statistically significant difference was found in the means between the values predicted by the equation and the real values, although the Bland-Altman plots did not show a significant bias and the intraclass correlation coefficients (FVC- ICC: 0.69; FEV1-ICC: 0.70) were within an adequate range. Conclusions: The developed FVC and FEV1 equations allow adequate prediction of spirometric values in male PEA of the regions included in the study.

COMPARISON OF LUNG FUNCTION IN PATIENTS WITH BRONCHIECTASIS DURING ACUTE EXACERBATION AND IN CONVALESCENCE - A PROSPECTIVE STUDY

Background- Bronchiectasis is a common chronic respiratory disease. A noticeable drop in lung function during exacerbations and recovery during convalescence has been revealed in patients with asthma or chronic obstructive pulmonary disease (COPD). Hence this study was planned with the objectives to compare lung functions during acute exacerbation and convalescence in patients with bronchiectasis. This was a prospective cohort study Methods- conducted in 50 patients over a duration of 18 months. Measurement of exacerbations and convalescence visits comprised of spirometry, sputum bacteriology, serum and sputum biomarker. Student's paired t test, Fischer's exact test or Chi square test was used to analyze the signicance of difference. P value <0.05 was considered as statistically signicant. In this study, Results- there was a signicant association of mMRC dyspnoea score in exacerbation and in convalescence. (p <0.0001). The analysis showed that mMRC dyspnoea score was shifted to lower scores in convalescence compared to that in exacerbation. FEV1, FVC and FEV1/FVC) and 6 MWT distance were signicantly lower in patients in exacerbation as compared in convalescence. Conclusion- There was marked improvement in lung functions in convalescence as compared to patients in acute exacerbation

Enfermedad de Pompe y compromiso respiratorio

Introducción: El compromiso respiratorio en la enfermedad de Pompe es una de sus manifestaciones más frecuentes, tiene un impacto negativo en la calidad de vida y facilita la aparición de múltiples complicaciones. Se puede presentar como parte evolutiva de la enfermedad o incluso ser el síntoma inicial de la patología. Contenidos: La presentación clínica del compromiso respiratorio en la enfermedad de Pompe se caracteriza por disnea, ortopnea, cefalea y tos, y sus cambios paraclínicos incluyen hipercapnia, policitemia, elevación del índice de apnea/hipopnea, así como disminución de la capacidad vital y de las presiones inspiratoria y espiratorias máximas. El compromiso respiratorio es causado principalmente por disfunción muscular (especialmente el diafragma) y alteración de la regulación del sistema nervioso central. Conclusiones: Es fundamental la valoración acuciosa inicial de los patrones respiratorios y por supuesto su seguimiento, el cual dependerá del tipo de progresión de la disfunción respiratoria (rápida o lenta) o del requerimiento específico para cada paciente (ventilación no invasiva o invasiva).

Introduction: Respiratory compromise in Pompe disease is one of the most frequent manifestations, which has a negative impact on quality of life and leads to multiple complications. This can occur as an evolutionary part of the disease, or even be the initial symptom of the pathology. Contents: Its clinical presentation is characterized by dyspnea, orthopnea, headache, and cough, and its paraclinical changes include hypercapnia, polycythemia, elevated apnea/hypopnea index, decreased vital capacity, and decreased maximum inspiratory and expiratory pressures. Respiratory compromise is caused mainly by muscular dysfunction (especially the diaphragm) and alteration of regulation of the central nervous system. Conclusions: An initial careful assessment of respiratory patterns is essential, and of course their follow-up, that will depend of the type of progression of respiratory dysfunction (rapid or slow) or the specific requirement for each patient (non-invasive or invasive ventilation).

Six-minute walk test for assessment of work capability in patients with chronic obstructive pulmonary disease: A cross-sectional comparative study

Background: Chronic obstructive pulmonary disease (COPD) is a systemic disorder causing morbidity, disability, and mortality throughout the world. Although, spirometry parameters have been used for decades to diagnose COPD as well as to grade the severity of this disease, others factors such as the BMI, degree of inflation, and exercise capacity have become important outcome measures for extra-pulmonary manifestations. The 6-min walk test (6MWT) is considered as a simple test to assess the functional capacity of COPD patients. The aim of our study was to implement 6MWT in patients of COPD in our setup to predict morbidity. Aims and Objectives: The objective of our study was to implement 6MWT in patients of COPD in our setup to predict morbidity. Materials and Methods: A cross-sectional comparative study was conducted on thirty COPD patients and thirty control subjects. All the subjects were investigated through history taking, clinical examination, spirometry, and 6MWT in the Department of Physiology, R.G. Kar Medical College and Hospital, Kolkata. Statistical analysis was done by SPSS version-21. Results: The values of the spirometry parameters were significantly reduced in cases than in the controls (P < 0.05). The values of 6-min walk distance as well as 6-min work (6MWORK) were also significantly reduced in cases than in the controls (P = 0.0023 and P = 0.0028, respectively). A strong positive correlation was found between forced vital capacity and 6MWORK (r = 0.556), BMI, and 6MWORK (r = 0.84) in patients of COPD. Conclusion: Our study substantiates that 6MWT can be implemented in our set up to assess the work capability and thus to predict morbidity in patients of COPD.

Relación entre dimensiones antropométricas de tronco y valores de espirometría / Association between anthropometric dimensions of trunk and spirometry indices

Los objetivos del presente estudio fueron primero evaluar la asociación de dimensiones antropométricas de tórax y tronco con índices espirométricos, segundo, ajustar una ecuación de predicción con dimensiones antropométricas de tronco y tercero, comparar nuestro modelo predictivo con dos ecuaciones diagnósticas. Se evaluaron 59 estudiantes universitarios entre 20 y 40 años, de ambos sexos, sin hábito tabáquico. Las variables consideradas fueron: edad, sexo, peso, estatura, diámetro transverso de tórax, diámetro anteroposterior de tórax, perímetro de tórax, altura de tórax, altura de tronco, flujo espiratorio máximo (FEM), volumen espiratorio forzado en el primer segundo (VEF1) y capacidad vital forzada (CVF). Se utilizó el análisis de regresión múltiple para estimar los valores espirométricos en función de las variables demográficas y antropométricas. La CVF y el VEF1 tienen asociación lineal directa con el diámetro transverso de tórax, altura de tórax, perímetro de tórax y altura de tronco. Se ajustó una ecuación de regresión lineal múltiple que indicó que es posible estimar la CVF y el VEF11 en función de la altura de tronco y el perímetro de tórax para ambos sexos. Estas variables son capaces de explicar el 74 % de los valores de CVF y el 68 % de los valores de VEF1. Al comparar los valores obtenidos por nuestras ecuaciones predictivas con las ecuaciones de referencia nacional observamos que nuestros resultados son más cercanos a los de Quanjer et al. (2012) que a los de Knudson et al. (1983). La altura de tronco y el perímetro de tórax tienen asociación directa con el VEF1 y CVF y son buenos predictores del VEF1 y CVF en estudiantes universitarios. Nuestros valores estimados son más cercanos a las ecuaciones de Quanjer et al. (2012) en comparación a las estimaciones de Knudson (1983).

SUMMARY: The purposes of the present study were first to evaluate the association between anthropometric dimensions of the thorax and trunk with spirometric indices, second, to fit a prediction equation with anthropometric dimensions of the trunk, and third, to compare our predictive model with two diagnostic equations. Fifty-nine university students between 20 and 40 years old, of both sexes and non-smokers were recruited. Variables considered were age, sex, weight, height, chest transverse diameter, chest anteroposterior diameter, chest perimeter, chest height, trunk height, maximum expiratory flow (PEF), forced expiratory volume in the first second (FEV1) and forced vital capacity (FVC). Multiple regression analysis was used to estimate spirometric values based on demographic and anthropometric variables. FVC and FEV1 have a direct linear association with chest transverse diameter, chest height, chest circumference, and trunk height. A multiple linear regression equation was fitted, indicating that it is possible to estimate FVC and FEV1 as a function of trunk height and chest girth for both sexes. These variables can explain 74% of the FVC values and 68% of the FEV1 values. Comparing the values obtained by our predictive equations with the national reference equations, we observe that our results are closer to those of Quanjer et al. (2012) than to those of Knudson et al. (1983). Trunk height and chest circumference have a direct association with FEV1 and FVC and are good predictors of FEV1 and FVC in university students. Our estimated values are closer to Quanjer et al. (2012) than Knudson et al. (1983) prediction equations.

Clinico-etiological Characteristics of Cystic Lung Disease: A Retrospective Study

Introduction: Diffuse cystic lung diseases (CLDs) are a heterogeneous group of uncommon disorders with characteristic imaging appearance. Cystic lung disease is a significant cause of mortality and morbidity with a wide spectrum of radiological presentations and etiological differentials. Though the literature is widely available on radiological approaches to CLD, a knowledge gap exists on the etiological spectrum, especially in the Indian scenario, as it is an orphan group of lung disorders. The interest and experience among pulmonologists regarding CLD are growing with the widespread use of CT scans. Clinical, radiographic, and histological findings are often essential for proper diagnosis, and multidisciplinary approach is required for optimal management of such cases. In our study, through real-world cases, we have highlighted the clinical manifestations and diverse etiological spectrum of CLD. Since these disorders are rare, incurable, and have variable disease progression, the authors have tried to address the holistic approach of this relatively less-understood group of disorders. Aims and objectives: The aim of the study was to identify clinical characteristics and etiological spectrum of patients manifesting with diffuse cystic lung disease radiologically. Materials and methods: In this retrospective analysis, the hospital electronic database was screened with Boolean operations and keywords for cysts OR pneumothorax. Among a total of 4,479 patients admitted to the respiratory ward /ICU during the period of January 2020–September 2022 at a tertiary care center in northern India, 14 patients with radiological diagnosis of CLD matched the relevant search. All relevant data of these patients were retrieved from the records. Results: Our patients presented predominantly with symptoms of cough and breathlessness. About 4 patients had pneumothorax as the first presentation. The mean age of presentation was 42.14 (standard deviation 12.6, age range 16–62 years). About 64% (n = 9/15) patients were females. The various etiologies identified were lymphangioleiomyomatosis (LAM), lymphocytic interstitial pneumonia, Birt–Hogg–Dube syndrome, hypersensitivity pneumonitis, Pneumocystis jirovecii pneumonia, and cystic metastasis, and in one patient, no definite cause was found despite detailed evaluation. Conclusion: Cystic lung disorders are a less commonly diagnosed entity with rare etiologies. In our study, we found a female preponderance and LAM as the commonest CLD. Pneumothorax is a sentinel event and commonly the presenting complaint in CLD. Identification of the etiology can help in institution of definite therapy when available. In view of unpredictable disease progression and outcome, these diseases warrant follow-up and imaging surveillance.

Evaluation of pulmonary function in patients of non-specific low back pain / Avaliação da função pulmonar em pacientes com dor lombar inespecífica

INTRODUCTION: Diaphragm is the primary inspiratory muscle and it plays an essential role in controlling the spine during postural control. In nonspecific low back pain, the diaphragm muscle becomes weak, due to which the pulmonary functions may decrease. To the best of our knowledge there is a scarcity of literature in regard to the effect of low back pain on pulmonary parameters. Thus, the study is aimed to evaluate the pulmonary function in patients with non-specific low back pain. METHODS: One hundred and thirteen patients with non-specific low back pain and 113 BMI matched normal individuals as a comparison group aged 18-40 years of male and female genders were recruited by purposive sampling method for this prospective cross-sectional study. The non-specific back pain group included participants diagnosed with non-specific low back pain with pain intensity > 3 on VAS scale and duration > 3 months. After initial screening and assessment, anthropometric characteristics were recorded. Then, the pulmonary function test (FEV1, FVC, FEV1/ FVC, PEFR, SVC, MVV) were recorded in both groups. RESULT: Kolmogorov-Smirnov test was used for normality assessment and data was found to be not normally distributed. Non parametric data was represented as median and IQR (Inter Quartile Range). Between groups data analysis was performed by using MannWhitney U test and the effect size was computed for the study variables. P < 0.05 was considered as statistically significant. There was a significant difference in pulmonary function values of FEV1, FEV1/FVC, PEFR, SVC, MVV. There was no significant difference in age and BMI of the participants of both groups. CONCLUSION: There exist significant differences in pulmonary function in patients with non-specific low back pain.

INTRODUÇÃO: O diafragma é o principal músculo inspiratório e desempenha um papel essencial no controle da coluna durante o controle postural. Na dor lombar inespecífica, o músculo diafragma torna-se fraco, podendo as funções pulmonares diminuir. Até onde sabemos, há escassez de literatura a respeito do efeito da dor lombar nos parâmetros pulmonares. Assim, o estudo tem como objetivo avaliar a função pulmonar em pacientes com dor lombar inespecífica. MÉTODOS: Cento e treze pacientes com dor lombar inespecífica e 113 indivíduos normais pareados com IMC como grupo de comparação com idades entre 18 e 40 anos, dos gêneros masculino e feminino, foram recrutados por método de amostragem proposital para este estudo transversal prospectivo. O grupo de dor nas costas inespecífica incluiu participantes com diagnóstico de dor lombar inespecífica com intensidade de dor > 3 na escala VAS e duração > 3 meses. Após triagem e avaliação inicial, as características antropométricas foram registradas. Em seguida, foram registrados os testes de função pulmonar (VEF1, CVF, VEF1/CVF, PFE, CVL, VVM) em ambos os grupos. RESULTADO: O teste de Kolmogorov-Smirnov foi utilizado para avaliação da normalidade e os dados não apresentaram distribuição normal. Os dados não paramétricos foram representados como mediana e IQR (intervalo interquartil). A análise dos dados entre grupos foi realizada pelo teste U de Mann-Whitney e o tamanho do efeito foi calculado para as variáveis do estudo. < 0,05 foi considerado estatisticamente significativo. Houve diferença significativa nos valores de função pulmonar de VEF1, VEF1/CVF, PFE, CVL, VVM. Não houve diferença significativa na idade e no IMC dos participantes de ambos os grupos. CONCLUSÃO: Existem diferenças significativas na função pulmonar em pacientes com dor lombar inespecífica.

Función pulmonar: ¿Debemos cambiar la forma de calcular la respuesta broncodilatadora en la espirometría en niños? / Should we change the way we calculate the bronchodilator response in children's spirometry?

Tradicionalmente se ha definido la respuesta broncodilatadora (RB) positiva como una mejoría ≥ de 12 % del VEF1. En el año 2022 se publica una Guía sobre la interpretación de función la pulmonar de la Sociedad Americana de Tórax y la Sociedad Europea de Enfermedades Respiratorias, donde se propone que la RB debe expresarse como el cambio porcentual del VEF1 en relación con el VEF1 predicho y que un cambio ≥ 10 % indica una RB positiva. Las sociedades científicas en Chile están evaluando estas recomendaciones para decidir su adecuada implementación en pediatría.

Traditionally, a positive bronchodilator (BR) response has been defined as a ≥ 12% improvement in FEV1. In the year 2022, a Guide on the interpretation of pulmonary function of the American Thoracic Society and the European Society of Respiratory Diseases was published, where it was proposed that BR should be expressed as the percent change in FEV1 relative to predicted FEV1 and that a change ≥ 10% indicates a positive BR. Scientific societies in Chile are evaluating these recommendations to decide their proper implementation in pediatrics.

Relation of impulse oscillometry and spirometry with quantitative thorax computed tomography after COVID-19 pneumonia

SUMMARY OBJECTIVE: This study aimed to investigate if there is any correlation between the quantitative computed tomography and the impulse oscillometry or spirometry results of post-COVID-19 patients. METHODS: The study comprised 47 post-COVID-19 patients who had spirometry, impulse oscillometry, and high-resolution computed tomography examinations at the same time. The study group consisted of 33 patients with quantitative computed tomography involvement, while the control group included 14 patients who did not have CT findings. The quantitative computed tomography technology was used to calculate percentages of density range volumes. The relationship between percentages of density range volumes for different quantitative computed tomography density ranges and impulse oscillometry-spirometry findings was statistically analyzed. RESULTS: In quantitative computed tomography, the percentage of relatively high-density lung parenchyma, including fibrotic areas, was 1.76±0.43 and 5.65±3.73 in the control and study groups, respectively. The percentages of primarily ground-glass parenchyma areas were found to be 7.60±2.86 and 29.25±16.50 in the control and study groups, respectively. In the correlation analysis, the forced vital capacity% predicted in the study group was correlated with DRV%[(-750)-(-500)] (volume of the lung parenchyma that has density between (-750)-(-500) Hounsfield units), but no correlation with DRV%[(-500)-0] was detected. Also, reactance area and resonant frequency were correlated with DRV%[(-750)-(-500)], while X5 was correlated with both DRV%[(-500)-0] and DRV%[(-750)-(-500)] density. Modified Medical Research Council score was correlated with predicted percentages of forced vital capacity and X5. CONCLUSION: After COVID-19, forced vital capacity, reactance area, resonant frequency, and X5 correlated with the percentages of density range volumes of ground-glass opacity areas in the quantitative computed tomography. X5 was the only parameter correlated with density ranges consistent with both ground-glass opacity and fibrosis. Furthermore, the percentages of forced vital capacity and X5 were shown to be associated with the perception of dyspnea.

Trayectorias de función pulmonar en asma persistente: del preescolar al escolar / Lung function trajectories in persistent asthma: from preschool to schoolchildren

Introducción: Se han informado patrones de deterioro temprano de la función pulmonar en el asma pediátrica. Nuestro objetivo fue identificar las trayectorias de la función pulmonar en la espirometría, desde la edad preescolar hasta la edad escolar. Materiales: Estudio prospectivo realizado entre el 2016 y el 2021. Se reclutaron pacientes con asma persistente a quienes se les realizó oscilometría de impulso (IOS)-espirometría al inicio y después de 3 años. La espirometría anormal se definió de acuerdo con las guías ATS/ERS. Métodos: se utilizó χ2 y ANOVA para comparar las características clínicas y promedios de parámetros de la espirometría e IOS entre trayectorias. Resultados: 86 pacientes, promedio de edad 5,3 y 8,3 años en su primera y segunda evaluación. El 70,9% de los pacientes mantuvo la espirometría normal en ambas evaluaciones (trayectoria 1), el 9,3% presentó espirometría preescolar anormal que normalizó en la edad escolar (trayectoria 2) y el 19,8% espirometría en anormal en ambas evaluaciones (trayectoria 3). La trayectoria 3 registró menor peso promedio al nacer (2,4 kg vs 3,02 kg p = 0,04), mayor promedio de exacerbaciones (5,3 vs 2,01 p = 0,00002), mayor promedio de hospitalizaciones (0,61 vs 0,16 p = 0,04), parámetros promedio más bajos en espirometría (relación VEF1/CVF %, relación VEF0,75/CVF %, VEF0,75 L, VEF0,5 L), promedios más bajos en X5 kPa/Ls y más altos en AX kPa/Ls, que la trayectoria 1. Conclusiones: La trayectoria 1 fue la más frecuente, con persistencia de función pulmonar normal. La trayectoria 3, la segunda más frecuente, inició seguimiento con función pulmonar disminuida en la espirometría y disfunción de vía aérea pequeña en el IOS que se mantuvo en la edad escolar. Los niños que siguieron la trayectoria 3 tuvieron menor peso al nacer, más exacerbaciones y hospitalizaciones que los niños de la trayectoria 1.

Introduction: Patterns of early decline in lung function have been reported in pediatric asthma. Our objective was to identify pulmonary function trajectories in spirometry, from preschool age to school age. Materials: Prospective study conducted between 2016 and 2021. Patients with persistent asthma who underwent impulse oscillometry (IOS)-spirometry at baseline and after 3 years were recruited. Abnormal spirometry was defined according to ATS/ERS guidelines. Methods: χ2 and ANOVA was used to compare clinics characteristics and means of IOS-spirometry parameters between trajectories. Results: 86 patients, mean age of 5,3 and 8,3 years in their first and second evaluation. 70.9% of the patients maintained normal spirometry in both evaluations (Track 1), 9.3% presented abnormal preschool spirometry that normalized at school age (Track 2) and 19.8% abnormal spirometry in both evaluations (Track 3). Trajectory 3 had a lower average birth weight (2,4 kg vs 3,02 kg p = 0,04), higher average of exacerbations (5,3 vs 2,01 p = 0,00002), higher average of hospitalizations (0,61 vs 0,16 p = 0,04), lowest averages parameters in spirometry (FEV1/FVC % ratio, FEV0,75/FVC % ratio, FEV0,75 L, FEV0,5 L), lower average in X5 kPa/Ls and higher in AX kPa/Ls, than trajectory 1. Conclusions: Trajectory 1 was the most common, with persistent normal lung function. Trajectory 3, the second most frequent, started follow-up with decreased lung function in spirometry and small airway disfunction in the IOS that were maintained at school age. Children who followed trajectory 3 had lower birth weight, more exacerbations, and hospitalizations than children in trajectory 1.

Motor and respiratory functions are main challenges to patients with multiple sclerosis / Funções motoras e respiratórias representam desafios importantes para pacientes com esclerose múltipla

Abstract Introduction People with multiple sclerosis (MS) present wide and varied symptoms. Objective To investigate the impact of MS on subjects' motor and respiratory functions. Methods One hundred one participants were enrolled in this study. The subjects had previous diagnosis of relapsing-remittent MS (n = 48) or presented no neurologic diseases (n = 53, control group). Assess-ments involved mobility (Timed Get Up and Go) and balance (Berg Balance Scale) tests. A force platform was used to evaluate postural stabilometry. Respiratory functions were assessed with a portable spirometer and a digital manovacuometer. Data analyses were carried out with Student´s t-tests, chi-square, and Pearson correlation index. Significance was set at 5%. Results Compared to control peers, participants with MS showed higher motor dysfunctions affecting mobility, balance, and postural stability. Spirometry indicated normal parameters for pulmonary flows and lung capacities in both groups. The manovacuometer, differently, pointed to a respiratory muscle weakness in 48% of participants with MS. Correlation analyses highlighted that respiratory functions are more associated to dynamic than to static motor tests. Conclusion Pathological changes in MS lead to motor dysfunction on mobility, balance and postural stability. Respiratory tests showed normal pulmonary flows and lung capacities in patients with MS, but with commitment of respiratory muscle strength. Respiratory functions were more impacted by dynamic tasks rather than static motor tasks.

Resumo Introdução Pessoas com esclerose múltipla (EM) apresentam sintomas amplos e variados. Objetivo Investigar o impacto cau-sado pela EM nas funções motoras e respiratórias. Métodos Cento e um participantes foram incluídos neste estudo. Os sujeitos tinham diagnóstico prévio de EM remitente-recorrente (n = 48) ou não apresentavam doenças neurológicas (n = 53, grupo controle). As avaliações envolveram testes de mobilidade (Timed Get Up and Go) e equilíbrio (Berg Balance Scale). Uma plataforma de força foi utilizada para avaliar a estabilometria postural dos sujeitos. As funções respiratórias foram avaliadas com um espirômetro portátil e um manovacuômetro digital. A análise dos dados foi realizada pelos testes t de Student, qui-quadrado e pelo índice de correlação de Pearson. Nível de significância foi estipulado em 5%. Resultados Comparados com controles saudáveis, participantes com EM apresentaram maiores disfunções motoras que afetam mobilidade, equilíbrio e estabilidade postural. A espirometria indicou parâmetros nor-mais para fluxos pulmonares e capacidades pulmonares em ambos os grupos. A manovacuômetria, diferentemente, apontou fraqueza dos músculos respiratórios em 48% dos participantes com EM. Análises de correlação destacaram que as funções respiratórias estão mais associadas a testes motores dinâmicos do que a testes estáticos. Conclusão As alterações patológicas na EM levam à disfunção motora na mobilidade, no equilíbrio e na estabilidade postural. Os testes respiratórios mostraram padrões normais para fluxos pulmonares e capacidades pul-monares em pacientes com EM, mas com comprometimento da força muscular respiratória. As funções respiratórias foram mais afetadas por tarefas motoras dinâmicas do que por tarefas estáticas.

Comparative analysis of pulmonary function in children born preterm and full-term at 6-9 years of age / Análise comparativa da função pulmonar em crianças de 6 a 9 anos de idade nascidas pré-termo e a termo

Abstract Objective: To compare pulmonary function parameters and the prevalence of altered pulmonary function in children born preterm and full-term, using the Global Lung Initiative reference values. Methods: This is a cross-sectional study with 6-9-year-old children submitted to measurement of airway resistance (Rint) and spirometry according to the American Thoracic Society and European Respiratory Society Technical Statement. The inclusion criteria were, among the preterm group: gestational age <37 weeks and birth weight <2000g; among the full-term group: schoolchildren born full-term with birth weight >2500g, recruited at two public schools in São Paulo, Brazil, matched by sex and age with the preterm group. As exclusion criteria, congenital malformations, cognitive deficit, and respiratory problems in the past 15 days were considered. Results: A total of 112 children were included in each group. Preterm children had gestational age of 30.8±2.8 weeks and birth weight of 1349±334g. Among them, 46.6% were boys, 46.4% presented respiratory distress syndrome, 19.6% bronchopulmonary dysplasia, and 65.2% were submitted to mechanical ventilation in the neonatal unit. At study entry, both groups were similar in age and anthropometric parameters. Parameters of pulmonary function (Z scores) in preterm and full-term groups were: Rint (0.13±2.24 vs. -1.02±1.29; p<0.001); forced vital capacity (FVC) (-0.39±1.27 vs. -0.15±1.03; p=0.106), forced expiratory volume in one second (FEV1)/FVC (-0.23±1.22 vs. 0.14±1.11; p=0.003), FEV1 (-0.48±1.29 vs. -0.04±1.08; p=0.071), and forced expiratory flow between 25% and 75% of vital capacity (FEF25-75) (1.16±1.37 vs. 2.08±1.26; p=0.005), respectively. The prevalence values of altered airway resistance (16.1 vs. 1.8%; p<0.001) and spirometry (26.8 vs. 13.4%, p=0.012) were higher in preterm infants than in full-term ones. Conclusions: Preterm children had higher prevalence of altered pulmonary function, higher Z scores of airway resistance, and lower Z scores of FEV1/FVC and FEF25-75 compared with those born full-term.

RESUMO Objetivo: Comparar parâmetros de função pulmonar e a prevalência de função pulmonar alterada em crianças nascidas pré-termo e a termo, utilizando a referência Global Lung Function Initiative. Métodos: Estudo transversal com crianças de 6-9 anos submetidas à medida de resistência de vias aéreas (Rint) segundo o American Thoracic Society and the European Respiratory Society Technical Statement. Como critérios de inclusão, entre o grupo pré-termo, estavam os nascidos com idade gestacional <37 semanas e peso <2000g; e entre o grupo termo, escolares de duas escolas públicas do município de São Paulo, nascidos a termo com peso >2500g, pareados por sexo e idade com o grupo pré-termo. Excluíram-se malformações congênitas, déficit cognitivo e problemas respiratórios havia menos de 15 dias. Resultados: Incluíram-se 112 crianças em cada grupo. Os prematuros (46,4% masculinos) apresentaram idade gestacional de 30,8±2,8 semanas e peso de 1349±334g. Entre eles, 46,4% tiveram síndrome de desconforto respiratório, 19,6% displasia broncopulmonar, e 65,2% receberam ventilação mecânica na unidade neonatal. À inclusão no estudo, os dois grupos apresentaram idade e dados antropométricos semelhantes. Os valores (escores Z) em nascidos pré-termo e a termo foram, respectivamente: Rint (0,13±2,24 vs. -1,02±1,29; p<0,001), capacidade vital forçada (CVF) (-0,39±1,27 vs. -0,15±1,03; p=0,106), volume expiratório forçado no primeiro segundo (VEF1)/CVF (-0,23±1,22 vs. 0,14±1,11; p=0,003), VEF1 (-0,48±1,29 vs. -0,04±1,08; p=0,071) e fluxo expiratório forçado em 25-75% da capacidade vital (FEF25-75) (1,16±1,37 vs. 2,08±1,26; p=0,005). A prevalência de alterações na resistência de vias aéreas (16,1 vs. 1,8%, p<0,001) e na espirometria (26,8 vs. 13,4%, p=0,012) foi maior nos prematuros. Conclusões: As crianças nascidas pré-termo apresentaram maior prevalência de alteração pulmonar, maiores escores Z de resistência de vias aéreas e menores escores Z de VEF1/CVF e FEF25-75 quando comparadas às nascidas a termo.

An observational study on the effect of laparoscopic cholecystectomy over pulmonary function test

Background: Inflammation of gallbladder bed, CO2 pneumoperitoneum, and intraoperative patient posture all plays a role in the etiology of pulmonary dysfunction during laparoscopic cholecystectomy. Aims and Objectives: The goal of this study was to detect any changes in pulmonary function following laparoscopic cholecystectomy using a portable spirometry instrument, as well as to determine the degree of pulmonary function impairment and complications. Materials and Methods: The pre-operative and post-operative spirometry of 150 patients undergoing laparoscopic cholecystectomy under general anesthesia were compared in this prospective observational study conducted at JLN medical college and attached group of hospitals after obtaining due permission from the Institutional Ethics Committee. Spirometry was performed preoperatively to determine baseline values forced vital capacity (FVC), forced expiratory volume in 1 s (FEV1), and peak expiratory flow rate (PEFR). Those who were unable to complete the required maneuvers were not included in the study. Pulmonary function testing was performed thrice after surgery, on days 1, 2, and 3 after surgery. To achieve a VAS score of <4, enough pain alleviation was provided. The paired t-test was used to compare spirometry values. Results: Between the preoperative and immediate post-operative periods, significant changes in FVC, FEV1, and PEFR were detected, indicating restrictive ventilator dysfunction. Conclusion: After laparoscopic cholecystectomy, light restrictive respiratory disturbances were noted with quick recovery of pulmonary function, potentially lowering post-operative pulmonary morbidity and mortality.

Executive Summary of the Recommendations on the Management of Asthma In Primary Care (2022) – New Updates

Background : Asthma is a heterogenous disease defined by the history of respiratory symptoms (shortness of breath, wheezing, cough, and chest tightness) that vary over time and in intensity, along with variable expiratory airflow limitation. Despite an ever-increasing prevalence of asthma across all age groups, this condition remains poorly managed in India. Majority of the Indian patients remain undiagnosed or wrongly diagnosed in general clinical practice and even those who get diagnosed, remain poorly or inadequately treated1,2. Since the last published 2020 Indian Medical Association (IMA) recommendations on the management of asthma in primary care, noteworthy critical changes have been recommended in relation to the diagnosis/management of asthma in international guidelines. Hence, there was a need to update the existing IMA recommendations. For the same, an expert group meeting was organized with family physicians having clinical experience in managing patients with asthma along with chest physicians and pediatricians. Important updates related to asthma diagnosis and its management were discussed and the final recommendation decisions were derived from the joint group discussion. Some of the key points derived from the discussion are mentioned below in the executive summary. For a detailed version of the new recommendations please click on the url.

A Study to Evaluate the Effect of Chyavanprash in Elderly People Having Low Vital Capacity

Ageing is a natural process. Senescence is an expression used for the deterioration in the vitality or the lowering of the biological efficiency that accompanies ageing. Respiratory system undergoes various anatomical, physiological and immunological changes with age. Lungs mature at age 20 to 25 years, and then it decreases about 200 to 250cc every 10 years from 20 years of age. Among elderly health problems, respiratory conditions make 16.1% of the complaints. Chyavanprash, one of the foremost Rasayana is specifically indicated for elderly people. This would be the remedy for improving the respiratory system functioning in aged people, if it could prove the effect in enhancing the vital capacity. Individuals of age 50 years and above were screened by using computerized spirometer. From these, 67 individuals with reduced vital capacity were selected for the study. Spirometric assessment was done. After the assessment, Chyavanprash was administrated. Dosage was fixed as 10gm for a period of 1 month. After 1 month spirometric assessment was done. This shows that there exists a positive response in vital capacity to Chyavanprash. Rasayana, Brmhana, Tridoshahara, and Balya properties evoked a positive response in vital capacity.