Local allergic rhinitis in children: identification and characterization in a specialty outpatient clinic.

Summary: Background. Local Allergic Rhinitis (LAR) is a phenotype defined by rhinitis symptoms with negative responses to systemic sensitization tests but with an exclusively nasal allergic inflammatory response. Data on the pediatric age group is scarce, and no Latin American data has been published so far. Methods. Nasal Allergen Challenge (NAC) was performed with Dermatophagoides pteronyssinus and Blomia tropicalis in six- to 18-year-old patients diagnosed with rhinitis and no systemic sensitization. NAC was monitored using subjective parameters and acoustic rhinometry. The study aimed to identify LAR in child and adolescent subjects previously diagnosed with non-allergic rhinitis (NAR) in a Brazilian specialty outpatient clinic (Allergy and Immunology). Results. During the study period, we analyzed 758 skin prick tests (SPT). Of those, 517 (68.2%) were diagnosed with rhinitis. Among those, 18.4% (95/517) had a negative SPT, meeting the criteria for inclusion in the study. Twenty-five patients underwent NAC, and 40% (10/25) of them, previously considered to have NAR, had a positive test and were reclassified as having LAR. Based on the analyzed characteristics, clinically differentiating LAR from NAR was impossible. Conclusions. This study represents the first investigation of LAR in child and adolescent subjects in Latin America, contributing significantly to the understanding of its prevalence and characteristics in this geographic area. Among a subgroup of patients lacking systemic sensitization submitted to NAC, 40% (10/25) demonstrated a positive NAC with Dermatophagoides pteronyssinus and Blomia tropicalis, warranting their reclassification to LAR. NAC with multiple allergens has been proven safe and viable in pediatric populations, affirming its critical role in the accurate diagnosis of LAR.

Impulse oscillometry in the assessment of children's lung function.

PURPOSE: To review available evidence in the literature on impulse oscillometry in the assessment of lung function in children with respiratory diseases, especially asthma. DATA COLLECTION: Research in the Medline, PubMed, and Lilacs databases, with the keywords forced oscillation, impulse oscillometry, asthma and impulse oscillometry. RESULTS: The Impulse Oscillometry System (IOS) allows the measurement of resistance and reactance of airways and is used as a diagnostic resource. A significant association between the findings of the IOS and those of spirometry is observed. In asthma, the IOS has already been used to assess the bronchodilator response and the therapeutic response to different drugs and has shown to be a sensitive technique to evaluate disease control. There are limitations to this assessment, such as children with attention deficit and in some cases it is difficult to interpret the results from a clinical point of view. CONCLUSION: The IOS is a useful tool for the measurement of the lung function of children. It is an easy test, although its interpretation is not straightforward.

Repercussions of preterm birth on symptoms of asthma, allergic diseases and pulmonary function, 6-14 years later

BACKGROUND: Prevalence of allergic diseases and impaired pulmonary function may be high in children born prematurely. This study aimed to assess pulmonary function and prevalence of asthma, atopic diseases and allergic sensitisation in these patients. METHODS: A cross-sectional study was conducted with children aged 6-14 years who were born prematurely with birth weight <2000g from January 2008 to May 2011. Exclusion criteria were: major malformations, or acute respiratory disorders. The International Study of Asthma and Allergies in Childhood questionnaire was applied followed by allergic skin prick test and spirometry. RESULTS: The study included 84 children aged 9.3±2.3 years born at mean gestational age of 31.8±2.4 weeks. The prevalence of current asthma was 25%, more severe asthma was 15.5%; rhinitis was 38.1%; flexural eczema was 8.3%; and a positive skin-prick test was 69.6%. Frequencies of children with values <80% of predicted were: FVC (8.3%), FEV1 (22.6%), and FEV1/FVC ratio (16.7%). Prevalence of children with FEF25-75% <70% of the predicted value was 32.4%, positive bronchodilator response was observed in 20.5% of cases, and altered pulmonary function in 42.9%. Factors associated with altered pulmonary function were oxygen dependency at 28 days of life (OR: 4.213, p = 0.021), the presence of wheezing in childhood (OR: 5.979, p = 0.014) and infant's height (OR: 0.945, p = 0.005). CONCLUSIONS: There was a high prevalence of severe asthma, allergic sensitisation, and altered pulmonary function among children and adolescents born prematurely. Bronchopulmonary dysplasia and a history of wheezing were risk factors for altered pulmonary function

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Repercussions of preterm birth on symptoms of asthma, allergic diseases and pulmonary function, 6-14 years later.

BACKGROUND: Prevalence of allergic diseases and impaired pulmonary function may be high in children born prematurely. This study aimed to assess pulmonary function and prevalence of asthma, atopic diseases and allergic sensitisation in these patients. METHODS: A cross-sectional study was conducted with children aged 6-14 years who were born prematurely with birth weight <2000g from January 2008 to May 2011. Exclusion criteria were: major malformations, or acute respiratory disorders. The International Study of Asthma and Allergies in Childhood questionnaire was applied followed by allergic skin prick test and spirometry. RESULTS: The study included 84 children aged 9.3±2.3 years born at mean gestational age of 31.8±2.4 weeks. The prevalence of current asthma was 25%, more severe asthma was 15.5%; rhinitis was 38.1%; flexural eczema was 8.3%; and a positive skin-prick test was 69.6%. Frequencies of children with values <80% of predicted were: FVC (8.3%), FEV1 (22.6%), and FEV1/FVC ratio (16.7%). Prevalence of children with FEF25-75% <70% of the predicted value was 32.4%, positive bronchodilator response was observed in 20.5% of cases, and altered pulmonary function in 42.9%. Factors associated with altered pulmonary function were oxygen dependency at 28 days of life (OR: 4.213, p=0.021), the presence of wheezing in childhood (OR: 5.979, p=0.014) and infant's height (OR: 0.945, p=0.005). CONCLUSIONS: There was a high prevalence of severe asthma, allergic sensitisation, and altered pulmonary function among children and adolescents born prematurely. Bronchopulmonary dysplasia and a history of wheezing were risk factors for altered pulmonary function.

Acoustic Rhinometry in Nasal Provocation Tests in Children and Adolescents.

OBJECTIVES: To standardize acoustic rhinometry (AR) in nasal provocation tests (NPTs) with histamine in children and adolescents. PATIENTS AND METHODS: We performed a cross-sectional validation to compare AR with anterior active rhinomanometry (AAR) during histamine NPT in 20 children and adolescents with persistent allergic rhinitis and 20 controls. Changes in total nasal resistance (AAR) were compared with changes in nasal volume in the first 5 cm (V5). RESULTS: Compared with controls, patients with rhinitis had significantly higher mean total nasal resistance (0.34 Pa/cm3/s vs 0.21 Pa/cm3/s; P=.01) and lower mean V5 values (8.20 cm3 vs 9.24 cm3; P=.04) at baseline. The mean histamine concentration necessary to increase total nasal resistance by at least 100% was significantly lower in the rhinitis group than in the control group (0.72 mg/mL vs 2.4 mg/mL; P<.001). At the end of the NPT a mean increase of 126% in total nasal resistance and a mean decrease of 24.3% in V5 were observed in the rhinitis group. When compared with the AAR criteria, the highest sensitivity and specificity values were observed for a cutoff represented by a 19%-21% drop in V5. CONCLUSIONS: We found AR to be a feasible and sensitive tool for monitoring nasal response in children and adolescents undergoing histamine NPT. The best AR cutoff for ending the NPT was a 19%-21% drop in V5.

Risk factors for recurrent wheezing - International Study of Wheezing in Infants (EISL) phase 3

BACKGROUND: We aimed to identify factors associated with recurrent wheezing (RW) in infants in the first year of life living in the Southern region of São Paulo city and participating in the 'Estudio Internacional de Sibilancias en Lactantes (EISL)' - phase 3 (P3). METHODS: 1335 parents of infants who were attended in primary care health units in the Southern region of São Paulo city from 2009 to 2010 answered the EISL-P3 written questionnaire. The wheezing group was stratified in accordance to the frequency of wheezing episodes as occasional wheezing (OW, less than three episodes), or RW (three or more episodes). Wheezing-associated factors were evaluated using multivariate analysis and were expressed as odds ratio (OR) and 95% confidence interval (95%CI). RESULTS: The most relevant factors related to OW were pneumonia (OR = 3.10, 95%CI = 1.68-5.73), hospitalisation due to pneumonia (OR = 2.88, 95%CI = 1.26-6.56) and recurrent upper respiratory infection (URI, OR = 1.87, 95%CI = 1.25-2.81). Regarding RW, recurrent URI (OR = 5.34, 95%CI = 3.83-7.45), pneumonia (OR = 4.06, 95%CI = 2.87-5.74) and asthmatic siblings (OR = 3.02, 95%CI = 1.67-5.45) were the most significantly associated factors. CONCLUSIONS: In the present study, we found that recurrent URI, positive history of pneumonia and familiar history of asthma were the most relevant factors associated with RW. The precocious knowledge of these factors can enable the identification of the probable asthmatic infants and can improve both prevention strategies and treatment of these patients

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Risk factors for recurrent wheezing--International Study of Wheezing in Infants (EISL) phase 3.

BACKGROUND: We aimed to identify factors associated with recurrent wheezing (RW) in infants in the first year of life living in the Southern region of São Paulo city and participating in the "Estudio Internacional de Sibilancias en Lactantes (EISL)" - phase 3 (P3). METHODS: 1335 parents of infants who were attended in primary care health units in the Southern region of São Paulo city from 2009 to 2010 answered the EISL-P3 written questionnaire. The wheezing group was stratified in accordance to the frequency of wheezing episodes as occasional wheezing (OW, less than three episodes), or RW (three or more episodes). Wheezing-associated factors were evaluated using multivariate analysis and were expressed as odds ratio (OR) and 95% confidence interval (95%CI). RESULTS: The most relevant factors related to OW were pneumonia (OR=3.10, 95%CI=1.68-5.73), hospitalisation due to pneumonia (OR=2.88, 95%CI=1.26-6.56) and recurrent upper respiratory infection (URI, OR=1.87, 95%CI=1.25-2.81). Regarding RW, recurrent URI (OR=5.34, 95%CI=3.83-7.45), pneumonia (OR=4.06, 95%CI=2.87-5.74) and asthmatic siblings (OR=3.02, 95%CI=1.67-5.45) were the most significantly associated factors. CONCLUSIONS: In the present study, we found that recurrent URI, positive history of pneumonia and familiar history of asthma were the most relevant factors associated with RW. The precocious knowledge of these factors can enable the identification of the probable asthmatic infants and can improve both prevention strategies and treatment of these patients.

Gender differences in the relationship between body mass index (BMI) changes and the prevalence and severity of wheezing and asthma in the first year of life.

BACKGROUND: Rapid weight gain has been recently associated with asthma at school age, but its influence in respiratory symptoms during infancy is still unknown. METHODS: Answers from 6541 parents living in six different cities of Brazil to the International Study of Wheezing in Infants (EISL) questionnaire were analysed. Data from reported weight and height at birth and at one year were used to calculate BMI. Rapid body mass index (BMI) gain was defined by the difference in BMI superior to 1.0z and excessive by the difference superior to 2.0z. RESULTS: Rapid BMI gain was found in 45.8% infants and excessive in 24.4%. Boys showed a significantly higher BMI gain than girls. Girls with rapid BMI gain showed a significantly higher prevalence of hospitalisation for wheezing (8.8% vs. 6.4%; aOR: 1.4, 95%CI: 1.1-1.8), severe wheezing (18.1% vs. 15.0%; aOR: 1.3, 95%CI: 1.0-1.5) and medical diagnosis of asthma (7.5% vs. 5.7%; aOR: 1.3, 95%CI: 1.0-1.7). Girls with excessive BMI gain also had a significantly higher prevalence of hospitalisation for wheezing (9.8% vs. 6.7%; aOR: 1.5, 95%CI: 1.1-2.0) and severe wheezing (18.9% vs. 15.5%; aOR: 1.3, 95%CI: 1.0-1.6). No significant association was found among boys. CONCLUSIONS: The majority of the evaluated infants showed BMI gain above expected in the first year of life. Although more commonly found in boys, rapid and excessive BMI gain in the first year of life was significantly related to more severe patterns of wheezing in infancy among girls.

Erratum in “Cytokines profile and acute bronchiolitis”

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Prevalence of symptoms of eczema in Latin America: results of the International Study of Asthma and Allergies in Childhood (ISAAC) Phase 3.

BACKGROUND: The aim of the International Study of Asthma and Allergies in Childhood (ISAAC) was to evaluate the prevalence of symptoms of eczema among children living in different parts of Latin America. Data were from centers that participated in ISAAC Phase 3. METHODS: This was a cross-sectional questionnaire survey of 93,851 schoolchildren (6 to 7 years old) from 35 centers in 14 Latin American countries and 165,917 adolescents (13 to 14 years old) from 56 centers in 17 Latin American countries. RESULTS: The mean prevalence of current flexural eczema in schoolchildren was 11.3%, ranging from 3.2% in Ciudad Victoria (Mexico) to 25.0% in Barranquilla (Colombia). For adolescents, the prevalence varied from 3.4% in Santo André (Brazil) to 30.2% in Barranquilla (mean prevalence, 10.6%). The mean prevalence of current symptoms of severe eczema among schoolchildren was 1.5%, ranging from 0.3% in Ciudad Victoria, Toluca, and Cuernavaca (Mexico) to 4.9% in La Habana (Cuba). For adolescents, the mean prevalence was 1.4%, ranging from 0.1% in Mexicali Valley (Mexico) to 4.2% in Santa Cruz (Bolivia). These prevalence values are among the highest observed during ISAAC Phase 3. In general, the prevalence of current symptoms of eczema was higher among the Spanish-speaking centers for both schoolchildren and adolescents. CONCLUSION: Environmental risk factors must be evaluated in order to identify potential causes for the differences observed, even in centers from the same country.

Common cold decreases lung function in infants with recurrent wheezing

Background: Common acute viral respiratory infections (colds) are the most frequent cause of exacerbations in infants with recurrent wheezing (RW). However, there is no quantitative information about the effect of colds on the lung function of infants with RW. This study was undertaken to determine the effect of common cold on forced expiratory parameters measured from raised lung volume in infants with RW. Methods: Spirometric lung function (expiratory flows from raised lung volume) was randomly assessed in 28 infants with RW while they had a common cold and when asymptomatic. Results: It was found that during colds there was a significant decrease in all forced expiratory parameters and this was much more evident for flows (FEF50%, FEF75% and FEF25–75%) which were definitively abnormal (less than -1.65 z-score) in the majority of infants. There was not association between family asthma, tobacco exposure, and other factors, with the extent of lung function decrease during colds. Tobacco during pregnancy but not a history of family asthma was significantly associated to lower expiratory flows; however, the association was significant only when infants were asymptomatic. Conclusion: This study shows that common colds cause a marked reduction of lung function in infants with RW

Common cold decreases lung function in infants with recurrent wheezing.

BACKGROUND: Common acute viral respiratory infections (colds) are the most frequent cause of exacerbations in infants with recurrent wheezing (RW). However, there is no quantitative information about the effect of colds on the lung function of infants with RW. This study was undertaken to determine the effect of common cold on forced expiratory parameters measured from raised lung volume in infants with RW. METHODS: Spirometric lung function (expiratory flows from raised lung volume) was randomly assessed in 28 infants with RW while they had a common cold and when asymptomatic. RESULTS: It was found that during colds there was a significant decrease in all forced expiratory parameters and this was much more evident for flows (FEF(50%), FEF(75%) and FEF(25-75%)) which were definitively abnormal (less than -1.65 z-score) in the majority of infants. There was not association between family asthma, tobacco exposure, and other factors, with the extent of lung function decrease during colds. Tobacco during pregnancy but not a history of family asthma was significantly associated to lower expiratory flows; however, the association was significant only when infants were asymptomatic. CONCLUSION: This study shows that common colds cause a marked reduction of lung function in infants with RW.

International Study of Wheezing in Infants (EISL): validation of written questionnaire for children aged below 3 years.

BACKGROUND: The multicenter International Study of Wheezing in Infants (EISL) was developed to study the prevalence of recurrent wheezing and related risk factors in infants during the first year of life using a written questionnaire (EISL-WQ). OBJECTIVES: To constructively validate a modified, shortened version of the EISL-WQ in children up to 36 months of age in São Paulo, Brazil, and to verify its usefulness in diagnosing probable asthma in these children. METHODS: The parents of 170 infants aged 12 to 36 months answered the shortened EISL-WQ in an emergency room and were asked if their child was currently wheezing before a diagnosis was made by a physician. The consistency between parent perception and the physician's diagnosis was then evaluated. A second group (n = 55) participated in the validation of the short-term repeatability of the shortened questionnaire by completing it twice (mean interval, 23 days). RESULTS: There was good agreement between parent perception of wheezing and the physician's diagnosis following auscultation (Kappa statistic = 0.7; odds ratio = 38.33; 95% confidence interval, 15.8 to 92.8; P < .001); sensitivity (82.8%), specificity (85.0%), positive predictive value (81.5%), and negative predictive value (86.0%) were all high.The short-term repeatability of the shortened version of the EISL-WQ was also high (kappa > 0.75). Questions added to the shortened EISL-WQ improved the internal consistency of the original questionnaire (Cronbach alpha = 0.823, P < .001) and a high Youden index was found for patients defined as probable asthmatics. CONCLUSIONS: The shortened version of the EISL-WQ translated into Portuguese has high internal consistency, and is a valid, reliable, and reproducible instrument for obtaining data on wheezing in children below 36 months of age and for identifying those with probable asthma.

Prevalence of symptoms of asthma, rhinitis, and atopic eczema in Brazilian adolescents related to exposure to gaseous air pollutants and socioeconomic status.

OBJECTIVES: To evaluate the relationship between exposure to gaseous air pollutants (ozone [O3], carbon monoxide [CO], nitrogen dioxide [NO2], and sulfur dioxide [SO2]) socioeconomic status and the prevalence of symptoms of asthma, rhinitis and atopic eczema in adolescents. SUBJECTS AND METHODS: A sample of 16 209 adolescents from São Paulo West (SPW), São Paulo South (SPS), Santo André (SA), Curitiba (CR), and Porto Alegre (PoA) were enrolled. Data on air pollutants and socioeconomic status were compared to prevalence of symptoms with the Spearman correlation coefficient. RESULTS: Socioeconomic status was quite similar in all cities. The levels of O3 in SPW, SPS, and SA, and of CO in SA were higher than the acceptable ones. In relation to O3 and CO exposures, adolescents from SPW and SA had a significant risk of current wheezing, whereas living in SPW was associated with a high risk of rhinoconjunctivitis, eczema, and flexural eczema and living in CR to rhinitis. Exposure to NO2 was associated with a high risk of current wheezing in SPW and SA, and of severe asthma in SPW and PoA. Exposure to SO2 was associated with a high risk of current wheezing in SPW and SA, severe asthma in SPW and PoA, and nighttime cough, eczema, flexural eczema and severe eczema in SPW. Living in SPW, CR, or PoA was associated with a high risk of rhinitis, rhinoconjunctivitis, and severe rhinitis. CONCLUSIONS: Although we did not detect a characteristic pattern for all symptoms evaluated or a specific air pollutant, our data suggest a relationship between higher exposure to photochemical pollutants and high prevalence or risk of symptoms of asthma, rhinitis, and atopic eczema.

Childhood tuberculosis diagnosed and managed as asthma: case report.

The worldwide incidence of tuberculosis (TB) has been increasing. Although its diagnosis is well established in adults, in children it is difficult due to its particular aspects. We report a 3 years and 8 month-old infant who experienced chronic wheezing, classified as moderate-to-severe asthma, had recurrent pneumonia, and was not responsive to management with beta adrenergic agents. Chest X-rays (CXR) showed heterogeneous condensation in medium lobe and the chest computerized-tomography scan (CCT) a heterogeneous increase in pulmonary transparency, like condensation in the same lobe. After four months of treatment with anti tuberculosis agents, a significant improvement in symptoms, normal CXR, absence of pulmonary medium lobe condensation, and persistence fibro-atelectatic band in lingula were observed.

Prevalence of atopic eczema and related symptoms in Brazilian schoolchildren: results from the International Study of Asthma and Allergies in Childhood (ISAAC) phase 3.

BACKGROUND: International comparisons of the prevalence of atopic eczema and related symptoms are scarce. The standardized protocol of the International Study of Asthma and Allergies in Childhood (ISAAC) facilitates investigation of prevalence all over the world. OBJECTIVE: To apply the ISAAC written questionnaire to evaluate the prevalence of atopic eczema and related symptoms among 6-7 year-old children and 13-14 year-old adolescents living in 20 Brazilian cities. METHODS: The ISAAC written questionnaire was filled in by 23,422 children aged 6-7 years and 58,144 adolescents aged 13-14 years living in 2 population centers in the north, 8 in the northeast, 1 in the midwest, 5 in the southeast, and 5 in the south. RESULTS: The prevalence of flexural eczema (itchy rash ever in characteristic places in the last 12 months) ranged from 5.3% to 13.0% for children and was lower among the adolescents (range, 3.4%-7.9%). Among children, the highest rates were observed in population centers in the northeast, mainly along the coast. Among adolescents the highest rates were observed in the north and northeast, mainly in Natal, Aracaju, and Vitória da Conquista. The northeastern countryside had higher prevalence rates of severe eczema (kept awake at night by this itchy rash in the last 12 months) in comparison to northeastern coastal centers. There was a significant correlation between the prevalence of flexural eczema and severe eczema for both age groups, separately (6-7 year-olds, prho= 0.756, P<.004; 13-14 year-olds, rho=0.874, P<.0001) or grouped (6-7 plus 13-14 years-olds, rho=0.696, P<.0001). CONCLUSION: The prevalence of eczema and related symptoms is variable in Brazil, where the highest prevalence is found in the north and northeast; on the other hand, a higher prevalence of severe eczema was observed in Brazilian centers in the south.

Avaliação espirométrica de crianças e adolescentes asmáticos acompanhados em ambulatório especializado / Spirometric evaluation of asthmatic children and adolescents followed in specialized out-patient clinic

Objetivo: descrever características espirométricas de crianças e adolescentes asmáticos acompanhados em ambulatório especializado. Métodos: cem asmáticos maiores de seis anos foram aleatoriamente convidados para o estudo. Sete recusaram-se a participar. Testes de função pulmonar (FP) foram realizados pela manhã (espirômetro Vitalograph®), quando os pacientes estavam livres de infecções respiratórias há pelo menos duas semanas e após suspensão de broncodilatadores de curta elonga ação. Foram obtidas curvas de fluxo-volume antes e 15 minutos após inalação de 400g de salbutamol. Doze pacientes não foram capazes de realizar curvas reprodutíveis. Resultados: a mediana de idade, foi 11,5 anos. Dezenove pacientes apresentavam asma intermitente (AI), 24 asma persistente leve (APL), 22 asma persistente moderada (APM) e 16 asma persistente grave (APG). As medianas dos valores basais de FP para AI, APL, APM e APG foram respectivamente: capacidadevital forçada (CVF): 96 per cent, 88 per cent, 84 per cent e 90 per cent; volume expiratório forçado no primeiro segundo (VEF1): 84 per cent, 82 per cent, 73 per cent e 65 per cent; fluxo expiratório forçado entre 25 per cent e 75 per cent da CVF (FEF25-75 per cent): 78 per cent, 66 per cent, 60 per cent e 43 per cent. Houve aumento significante nos valores de FP após salbutamol para todos os parâmetros avaliados. Não houve correlação entre a gravidade da asma e o incremento de FP após salbutamol. O FEF25-75 per cent foi o parâmetro que melhor discriminou a gravidade da asma e que indicou alterações funcionais em maior número de casos. Nãohouve correlação entre o tempo de doença e os valores de FP. Conclusões: a espirometria é útil na avaliação de crianças e adolescentes asmáticos. O FEF25-75 per cent é o parâmetro mais sensível para a avaliação da gravidade da doença.

Variability of the raised volume rapid thoracic compression technique in infants with recurrent wheezing.

Measuring forced expiratory flows from raised lung volume in infants represents a significant advance in the assessment of pulmonary function early in life. However, variability in the main parameters obtained with raised volume rapid thoracic compression (RVRTC), FVC, FEV(0.5), FEF(50), FEF(75), and FEF(25-75), has not been completely evaluated. This study was performed to determine the intra-subject variability of spirometric-like parameters in infants with recurrent wheezing obtained with RVRTC. One hundred and two infants with recurrent wheezing (mean age 62 +/- 22 weeks) who were asymptomatic at the moment of measuring lung function participated in this study. For the variability analysis, three to five technically acceptable curves at flow-limitation jacket pressure were employed. The mean coefficient of variation (95 % CI) of spirometric parameters was as follows: FVC = 2.9 % (2.6-3.2); FEV(0.5) = 2.2 % (1.9-2.5); FEF(50) = 3.7 % (3.3-4.1); FEF(75) = 5.9 % (5.2-6.6) and FEF25-75 = 3.3 % (2.9-3.7). This study demonstrates the high reproducibility of the spirometric parameters measured with the technique of raised lung volume in infants.

Variability of the raised volume rapid thoracic compression technique in infants with recurrent wheezing

Measuring forced expiratory flows from raised lung volume in infants represents a significant advance in the assessment of pulmonary function early in life. However, variability in the main parameters obtained with raised volume rapid thoracic compression (RVRTC), FVC, FEV0.5, FEF50, FEF75, and FEF25-75, has not been completely evaluated. This study was performed to determine the intra-subject variability of spirometric-like parameters in infants with recurrent wheezing obtained with RVRTC. One hundred and two infants with recurrent wheezing (mean age 62 ± 22 weeks) who were asymptomatic at the moment of measuring lung function participated in this study. For the variability analysis, three to five technically acceptable curves at flow-limitation jacket pressure were employed. The mean coefficient of variation (95% CI) of spirometric parameters was as follows: FVC = 2.9% (2.6-3.2); FEV0.5 = 2.2% (1.9-2.5); FEF50 = 3.7% (3.3-4.1); FEF75 = 5.9% (5.2-6.6) and FEF25-75 = 3.3% (2.9-3.7). This study demonstrates the high reproducibility of the spirometric parameters measured with the technique of raised lung volume in infants

La medición del flujo espiratorio forzado con volumen pulmonar aumentado en lactantes supone un avance significativo en la evaluación de la función pulmonar en las primeras etapas de la vida. Sin embargo, no se ha estudiado a fondo la variabilidad de los parámetros principales obtenidos mediante la compresión torácica rápida previa insuflación (CTRIP), tales como FVC, FEV 0.5, FEF 50, FEF 75 y FEF 25-75. El presente estudio tuvo como objetivo determinar la variabilidad en un mismo sujeto de los parámetros espirométricos obtenidos mediante CTRIP en lactantes con respiración sibilante recurrente. Participaron en el estudio 102 lactantes con respiración sibilante recurrente (con una media de edad de 62 ± 22 semanas) que estaban asintomáticos en el momento de medirles la función pulmonar. Para el análisis de la variabilidad se emplearon entre 3 y 5 curvas técnicamente aceptables obtenidas con presiones de compresión en nivel de limitación de flujo. El cociente medio de variación (IC 95%) de los parámetros espirométricos fue el siguiente: FVC = 2,9% (2,6-3,2), FEV 0,5 = 2,2% (1,9-2,5), FEF 50 = 3,7% (3,3-4,1), FEF 75 = 5,9% (5,2-6,6) y FEF 25-75 = 3,3% (2,9-3,7). Este estudio, realizado sobre 102 lactantes con respiración sibilante recurrente, demostró una elevada reproducibilidad de los parámetros espirométricos medidos con la técnica del volumen pulmonar aumentado en lactantes

Asthma and respiratory disease mortality rates in the state of Sao Paulo, Brazil: 1970-1996.

BACKGROUND: Asthma morbidity and mortality have been increasing. Data of asthma and respiratory mortality rates in Brazil are scarse. METHODS: We studied asthma and respiratory disease mortality rates in the state of So Paulo (capital and country side) from 1970 to 1996, as its relation with sales of drugs usually used in asthma treatment. RESULTS: Asthma mortality in the 5-34-year age group has doubled in the state of So Paulo (0.2 deaths/100,000 inhabitants in 1970 to 0.4 in 1996), mainly by its increase in the capital. The greatest increase was observed in the population of up to 15 years of age. The sales of inhaled anti-inflammatory drugs are proportionally very low and reflect a greater concern about the treatment of acute exacerbations. CONCLUSION: We believe that the institution of a public health supply to the whole population could provide better conditions for the control of those indexes.