Rate and predictors of insufficient sweat volume in very young infants after pilocarpine gel iontophoresis: prospective, population-based study.

OBJECTIVE: To verify the rate and predictors of 'quantity not sufficient' (QNS) among Brazilian infants younger than 3 months with positive newborn screening (NBS) for cystic fibrosis (CF). DESIGN: Prospective, population-based study. SETTING: Public Statewide Newborn Screening Programme where the incidence rate of CF is ≈1:11 000. PATIENTS: Subjects with positive two-tiered immunoreactive trypsinogen. INTERVENTIONS: Sweat induction and collection were performed in the same facility; one sweat sample was obtained per individual. MAIN OUTCOME MEASURES: The QNS rate and its predictors; analysis corresponded to the day of sweat collection. RESULTS: Among the 975 participants, QNS rates for 10 and 15 µL were 3.6% (95% CI 2.5% to 4.9%) and 8.3% (95% CI 6.6% to 10.2%). Infants weighing >3056 and >3845 g and with gestational age higher than 37 weeks had a greater likelihood (5.5 and 6.7, and 2.7 and 5.8 times more, respectively) of avoiding QNS than their peers. CONCLUSION: QNS rates fulfilled the requirements, but predictors differed from those recommended by the Cystic Fibrosis Foundations guidelines.

Sweat conductivity diagnostic accuracy for cystic fibrosis: a systematic review and meta-analysis.

OBJECTIVE: We conducted a systematic review and meta-analysis of diagnostic test accuracy studies to summarise the properties of sweat conductivity (SC) to rule in/out cystic fibrosis (CF). DATA SOURCE: We searched PubMed, Embase, Web of Science, Google Scholar, SciELO and LILACS up to 13 March 2023. STUDY SELECTION: We selected prospective and retrospective diagnostic test accuracy studies which compared SC, measured through two well-established and commercially available devices, that is, Nanoduct or Sweat-Chek Analyser, to quantitative measurement of sweat chloride. MAIN OUTCOME MEASURES: Pooled sensitivity, specificity, positive likelihood ratio (+LR) and negative likelihood ratio (-LR), and their corresponding 95% CIs. DATA EXTRACTION AND SYNTHESIS: The Preferred Reporting Items for a Systematic Review and Meta-analysis of Diagnostic Test Accuracy Studies guidelines were followed. Data were extracted by one reviewer and checked by another. The hierarchical summary receiver operating characteristics model was used to estimate diagnostic test accuracy. RESULTS: Ten studies involving 8286 participants were included. The pooled estimates of sensitivity, specificity, +LR and -LR were 0.97 (95% CI 0.94 to 0.98), 0.99 (95% CI 0.98 to 0.99), 171 (95% CI 58 to 500) and 0.02 (95% CI 0.01 to 0.05), respectively. Sensitivity analyses did not reveal a substantial impact of study-level factors on the results, such as study quality, cut-off values for a positive test, study sample size and participant age group. The quality of evidence was considered moderate. CONCLUSION: SC demonstrated excellent diagnostic performance. In addition, its accuracy parameters suggest its role as an alternative to the sweat test for CF diagnosis. PROSPERO REGISTRATION NUMBER: CRD42022284504.

Sweat conductivity for diagnosing cystic fibrosis after positive newborn screening: prospective, diagnostic test accuracy study.

OBJECTIVE: To assess the accuracy of sweat conductivity among newborns and very young infants. DESIGN: Prospective, population-based, diagnostic test accuracy study. SETTING: Public Statewide Newborn Screening Programme where the incidence rate of cystic fibrosis (CF) is ≈1:11 000. PATIENTS: Newborns and very young infants with positive two-tiered immunoreactive trypsinogen. INTERVENTIONS: Sweat conductivity and sweat chloride were performed simultaneously, on the same day and facility by independent technicians, with the cut-off values of 80 mmol/L and 60 mmol/L, respectively. MAIN OUTCOME MEASURES: Sensitivity, specificity, positive and negative predictive values (PPV and NPV), overall accuracy, positive and negative likelihood ratios (+LR, -LR) and post (sweat conductivity (SC)) test probability were calculated to assess SC performance. RESULTS: 1193 participants were included, 68 with and 1108 without CF, and 17 with intermediate values. The mean (SD) age was 48 (19.2) days, ranging from 15 to 90 days. SC yielded sensitivity of 98.5% (95% CI 95.7 to 100), specificity of 99.9% (95% CI 99.7 to 100), PPV of 98.5% (95% CI 95.7 to 100) and NPV of 99.9% (95% CI 99.7 to 100), overall accuracy of 99.8% (95% CI 99.6 to 100), +LR of 1091.7 (95% CI 153.8 to 7744.9) and -LR of 0.01 (95% CI 0.00 to 0.10). After a positive and negative sweat conductivity result, the patient's probability of CF increases around 350 times and drops to virtually zero, respectively. CONCLUSION: Sweat conductivity had excellent accuracy in ruling in or ruling out CF after positive two-tiered immunoreactive trypsinogen among newborns and very young infants.

Atualizações no tratamento de bronquiolite viral aguda / Updates on acute bronchiolitis treatment

Bronquiolite viral aguda consiste em uma afecção viral que acomete lactentes com idade inferior a dois anos, sendo o pico de incidência abaixo de seis meses de vida. O quadro clínico consiste em sintomas de infecção de vias aéreas superiores, que evolui após dois a quatro dias com cansaço, dispneia, taquipneia, além de esforço respiratório. Febre e redução da aceitação da dieta também podem ocorrer. Apneia tem sido relatada em casos graves ou em prematuros. O diagnóstico baseia-se na história clínica e no exame físico, sendo exames complementares reservados quando há suspeita de outros diagnósticos ou de complicações. O tratamento é suportivo, sendo a oxigenoterapia indicada para pacientes com saturação de oxigênio abaixo de 90%. Atualmente, o corticoide oral não tem indicação no tratamento. Broncodilatadores não são indicados de rotina e o uso da salina hipertônica é controverso. O antiviral, ribavirina, tem indicação em casos específicos, devido aos efeitos adversos e ao alto custo. A profilaxia da BVA é fundamental, sendo a lavagem das mãos e o uso de álcool, de máscaras e de luvas essenciais para prevenção da doença. Como medicação profilática, o palivizumabe é indicado apenas em casos selecionados.(AU)

Acute bronchiolitis consists of a viral infection that affects children younger than 2 years old, with the peak of incidence under 6 months. The clinical disease has symptoms of infection of the upper airway, which develops after 2-4 days with fatigue, dyspnea, tachypnea, and respiratory effort. Fever and reduction of dietary compliance, may also occur. Apnea has been reported in severe cases or premature. The diagnosis is based on clinical history and physical examination, reserved additional tests when there is a suspicion of other diagnoses or complications. Treatment is supportive, the oxygen therapy is indicated for patients with oxygen saturation under 90%. Currently, oral corticosteroids has no indication for the treatment. The use of bronchodilators is not routinely indicated and the use of hypertonic saline is controversial. The use of the antiviral ribavirin is indicated in specific cases because there are adverse effects and high costs. Prophylaxis of bronchiolitis is fundamental, and hand-washing, use of alcohol, use of masks and gloves are essential for disease prevention. The use of palivizumab is indicated in selected cases.(AU)

Pulmonary radiographic findings in young children with cystic fibrosis.

BACKGROUND: Pulmonary evaluation is one of the greatest challenges in children with cystic fibrosis who are younger than 6 years. Although chest CT can provide the most information for initial and progressive changes in cystic fibrosis, the radiation exposures can lead to significant cumulative exposure in children as they are followed with serial scanning to monitor early and progressive disease. Therefore the systematized study of chest radiographs using the Brasfield score has been used scientifically with the aim of evaluating the evolution of pulmonary abnormalities in children with cystic fibrosis. OBJECTIVE: This study was performed to assess the radiologic findings in children younger than 6 years with cystic fibrosis. We used the Brasfield score to compare radiographs performed in patients with Pseudomonas aeruginosa vs. oxacillin-sensitive Staphylococcus aureus and to compare radiographs in children with early vs. delayed diagnosis. MATERIALS AND METHODS: A total of 254 chest radiographs from 67 children who had undergone material cultures of the airways as part of routine care were evaluated in this cross-sectional study. The statistical analysis was performed by the Kruskal-Wallis test, with a significance level of 5%. RESULTS: Approximately 35.8% of chest radiographs had a Brasfield score lower than 21 points, which is compatible with potentially irreversible pulmonary disease. Brasfield scores decreased (this score decreases with increasing disease severity) in older children, and both bacterial colonization with Pseudomonas and later diagnosis were associated with lower (greater disease) scores. CONCLUSION: The evaluation of radiographs using the Brasfield score demonstrated the most important pulmonary findings in cystic fibrosis and identified the age group when these alterations began to appear more pronounced.

Pneumonias adquiridas na comunidade na infância e adolescência / Community-acquired pneumonia in childhood and adolescence

Infecções respiratórias agudas são responsáveis por elevada morbimortalidade na infância. As pneumonias comunitárias são comuns na prática diária do médico, especialmente nos meses do outono e inverno, podendo ter consequências graves, como óbitos infantis. Elas geralmente ocorrem como complicação de uma infecção viral das vias aéreas e a etiologia varia conforme a faixa etária. Um dos maiores desafios na abordagem das pneumonias é a identificação do agente etiológico. O quadro clí- nico pode variar na dependência da faixa etária. Febre, tosse, taquidispneia, tiragem e alterações da ausculta pulmonar são observados em praticamente todas as idades. O diagnóstico permanece baseado em critérios clínicos e radiológicos. Os exames laboratoriais podem ser realizados na tentativa de tentar buscar o agente etiológico, direcionar o tratamento ou até mesmo investigar diagnósticos diferenciais. O tratamento poderá ser realizado ambulatorialmente, na maioria dos casos. Medidas gerais para a prevenção de pneumonia incluem incentivo ao aleitamento materno, combate à desnutrição, melhora das condições de moradia, redução da exposição ao fumo. É fundamental que toda a equipe da atenção primária conheça os sinais de alerta, as indicações de internação e encaminhamento para o hospital de pacientes graves a fim de se evitarem danos aos pacientes.(AU)

Acute respiratory infections are responsible for high morbidity and mortality in childhood. The community-acquired pneumonia is common in daily practice physician especially in the months of autumn and winter, and can have serious consequences, such as infant deaths. They usually occur as a complication of a viral infection of the airways and etiology varies by age group. One of the biggest challenges in addressing pneumonia is the identification of the etiologic agent. The clinical picture may vary depending on the age group. Fever, cough, tachydyspnea, circulation and lung auscultation changes are observed in almost all ages. The diagnosis remains based on clinical and radiological criteria. Laboratory tests can be performed to try to get the etiologic agent, direct treatment or even investigate differential diagnoses. The treatment may be performed in an outpatient setting, in most cases, or in hospital. General measures for prevention of pneumonia include breastfeeding promotion, combating malnutrition, improvement of housing conditions, reducing exposure to smoke. It is essential that all primary care staff know the warning signs, the indications for hospitalization and referral to hospital for critically ill patients in order to prevent harm to patients.(AU)

Prevalência e gravidade de asma em adolescentes de Belo Horizonte / Prevalence and severity of asthma in adolescents of Belo Horizonte

Objetivo: apresentar os resultados do International Study of Asthma and Allergies in Chil-dhood (ISAAC ) em Belo Horizonte, para verificar a prevalência de asma em adolescentes e otimizar as estratégias de sua assistência na rede pública. Métodos: estudo transversal com o questionário ISAAC, autoaplicado em adolescentes de 13 e 14 anos de idade, nas escolas municipais de Belo Horizonte. Resultados: foram avaliados 3.088 adolescentes (47,4 por cento masculinos). A prevalência de asma foi de 17,8 por cento (IC 95 por cento 16,5-19,2). As manifestações clínicas em 10,9 a 17,4 por cento dos adolescentes asmáticos eram compatíveis com a sua forma de mais gravidade. Não houve diferenças em relação à prevalência de sibilância nos últimos 12 meses quanto ao sexo, as as meninas responderam afirmativamente com mais frequncia às questões referentes a sibilos alguma vez na vida (RP=0,86, IC 95 por cento 0,80-0,93, p menor que 0,001) e tosse noturna nos últimos 12 meses (RP > 0,74, IC 95 por cento 0,68-0,80, p menor que 0,001). Conclusões: a elevada prevalência da asma brônquica ressalta a necessidade de implantação de program a de assistência aos adolescentes asmáticos, principalmente considerando que 15 por cento deles apresentam sintomas persistentes que requerem tratamento de manutenção em longo prazo.

Pandemia do vírus influenza A H1N1: experiência da abordagem pediátrica no Hospital das Clínicas da UFMG / Pandemic Influenza A H1N1 virus: pediatric experience in the Clinical Hospital of UFMG

Introdução: apresenta-se revisão histórica com as características do vírus influenza A H1N1 e a evolução da pandemia. Objetivos: observar o comportamento da população pediátrica e comparar temporalmente as ações e as recomendações dos protocolos do Ministério da Saúde vigentes em cada momento. Métodos: trata-se de estudo descritivo das ações tomadas pelo Hospital das Clínicas da Universidade Federal de Minas para atendimento hospitalar e ambulatorial pediátrico dos casos suspeitos ou confirmados de infecção pelo novo vírus. Resultados: nas publicações mundiais atuais, a infecção pelo vírus influenza A H1N1 na faixa pediátrica mostrou ter mais gravidade nos pacientes com comorbidades. A evolução das crianças que não apresentavam comorbidades foi semelhante à da influenza sazonal. Conclusões: é importante o levantamento de dados brasileiros no preparo para uma possível segunda onda de infecção por esse vírus ou outro mutante. (AU)

Introduction: This is a historical review of the influenza A vírus H1N1 subtype and the pandemic evolution. Objectives: To observe the behavior of the pediatric population and to compare over time the actions and recommendations of the protocols of the Ministério da Saúde in effect at any time. Methods: This is a descriptive study of the actions taken by the Hospital das Clinicas, Federal University of Minas Gerais for hospital and outpatient pediatric cases of suspected or confirmed infection by this new virus. Results: The current publications worldwide show that the infection with influenza A H1N1 in pediatric patients was shown to be more serious in patients with comorbidities. The development of children who had no comorbidities was similar to seasonal influenza. Conclusions: Data collection in Brazil is important in preparation for a possible second infection stage by this virus or other mutants. (AU)

Gastroenterite eosinofílica em criança, levando à desnutrição / Eosinophilic gastroenteritis and children with malnutrition

A gastroenterite eosinofílica é uma afecção caracterizada pela infiltração maciça de eosinófilos no trato gastrointestinal. Foi descrita pela primeira vez por Kaijser em 1937 e pode acometer qualquer área do trato gastrointestinal. A causa e o mecanismo de infiltração de eosinófilos são ainda desconhecidos. A apresentação pode variar, dependendo da localização, assim como da profundidade e da extensão do acometimento, e geralmente tem curso crônico. É uma doença relativamente rara, que afeta predominantemente adultos jovens do sexo masculino. (AU)

Eosinophilic gastroenteritis is a condition with extensive infiltration of eosinophils in the gastrointestinal tract. It was first described by Kaijser en 1937 and can affect any part of gastrointestinal tract. The cause and the real way for infiltration are unknown. Presentation may vary depending on location as well as depth and extent of bowel wall involvement and usually runs a chronic relapsing course. It is a rare disease that affects mainly young adult men. (AU)