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Introduction: Sleep-disordered breathing (SDB) and gas exchange disorders are common in patients with cystic fibrosis (CF). Currently, the impact of the disease on sleep patterns in patients living at high altitude and the relationship of these patterns to lung function are largely unknown. The aim of this study was to determine the frequency of SDB in children with CF aged 6-18 years and the relationship between SDB and lung function (FEV1). Methods: This is an analytical cross-sectional study of children aged 6-18 years diagnosed with CF. Spirometry before and after bronchodilators and polysomnography with capnography were performed. Descriptive analysis of qualitative and continuous variables was performed. Spearman's correlation coefficient was used to determine the correlation between polysomnogram and lung function (FEV1). Results: Twenty-four patients with CF were included. The mean age was 10.5 ± 3.1 years and 62.5% were male. Nine children had bronchiectasis on chest CT. The median absolute baseline FEV1 was 1,880 (1,355-2,325) ml and 98% (83%-110%) of predicted value. No significant difference in FEV1% was observed between subjects with obstructive sleep apnea (OSA) and those without OSA (P = 0.56). The prevalence of OSA was 66.7% in children younger than 13 years and 40% in children older than 13 years. The Spearman correlation coefficient between FEV1 and percentage of total sleep time with saturation less than 90% (T90) was rho -0.52 (p-value = 0.018), and between FEV1 and percentage of total sleep time with saturation less than 85% (T85) was statistically significant with rho -0.45 (p-value = 0.041). A positive correlation was observed between FEV1 and SpO2 during sleep with rho 0.53 and a statistically significant p-value (0.014). Conclusions: A high prevalence of sleep apnea was found in children with CF living at high altitude, with a negative correlation between FEV1 and T90 and T85 oxygenation indices, and a positive correlation between FEV1 and SpO2 during sleep.

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INTRODUCTION: Patients with severe COVID-19 develops an acute respiratory distress syndrome (ARDS), requiring admission to the intensive care unit. COVID-19 also reports an increased prevalence of comorbidities, similar to patients with Sleep disorder breathing (SDB). OBJECTIVES: To evaluate the association between undiagnosed SDB and the risk of ARDS and pulmonary abnormalities in a cohort of patients' survivors of COVID-19 between 3 and 6 months after diagnosis. METHODS: Prospective cohort study of patients who developed ARDS during hospitalization due to COVID-19 compared with a control group of patients who had COVID-19 with mild to moderate symptoms. All patients were evaluated between the 12th and 24th week after SARS-CoV-2 infection. The evaluation includes persistent symptoms, lung diffusing capacity of carbon monoxide (DLCO), chest CT scan and home sleep apnea test. SDB was diagnosed by the respiratory disturbance index ≥5 ev/h. The association between SDB and ARDS, the hazards of lung impairment and the hazard ratios (HR) were analyzed. RESULTS: A total of 60 patients were included (ARDS: 34 patients, Control: 26 patients). The mean follow-up was 16 weeks (range 12-24). ARDS reported a high prevalence of SDB (79% vs. 38% in control group). A total of 35% reported DLCO impairment, and 67.6% abnormal chest CT. SDB was independently associated to ARDS, OR 6.72 (CI, 1.56-28.93), p < 0.01, and abnormal Chest CT, HR 17.2 (CI, 1.68-177.4, p = 0.01). Besides, ARDS, days in mechanical ventilation, male gender were also associated with an increased risk of abnormal chest CT. CONCLUSION: Undiagnosed SDB is prevalent and independently associated with ARDS. In addition, undiagnosed SDB increased the hazard of abnormal Chest CT in the midterm. STUDY REGISTER: ISRCTN16865246.

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Objective: Sleep-disordered breathing (SDB) is highly prevalent in school children with poorly-controlled asthma. However, this association has not been assessed in preschoolers with recurrent wheeze, nor in those at risk for asthma. We hypothesized that preschoolers with asthma risk (positive asthma predictive index [API]) have a higher prevalence of SDB and higher inflammatory biomarkers (blood-hsCRP and urinary-LTE4) levels than those with negative API.Method: Children 2 to 5 years of age with recurrent wheezing were classified as positive or negative API. SDB was determined by the pediatric sleep questionnaire (PSQ) and its subscale (PSQSub6). Demographic characteristics, spirometry, blood hsCRP and urinary LTE4 were assessed.Results: We enrolled 101 preschoolers: 70 completed all measurements, 55.4% were males, mean age 4.07 ± 0.87 years, 45% overweight or obese, 70% had positive API, 87.5% had rhinitis. The prevalence of SDB measured by PSQ was 40.8% and by PSQSub6 was 29.6%. However, the proportion of SDB was similar between positive and negative API groups. The hsCRP (mean ± SD) was higher in the positive than in negative API (3.58 ± 0.58 and 1.32 ± 0.36 mg/L, p = 0.69, respectively); moreover, no differences in urinary LTE4 were found between groups. No correlation of PSQ (+) or PSQSub6 (+) with hsCRP and uLTE4 was found. However, preschoolers with positive API had significantly more post-bronchodilator percentage change in FEF25-75 than negative API (24.14 ± 28.1 vs. 4.13 ± 21.8, respectively, p = 0.01).Conclusions: In preschoolers with recurrent wheezing, we should be investigating for the coexistence of SDB, using early screening methods for detecting those conditions.

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RESUMEN Introducción: El trastorno respiratorio del sueño (TRS) afecta al 2% a 3% de la población pediátrica, siendo la hiperplasia adenoamigdalina (HAA) su principal causa. Se ha observado un aumento en los niveles de leucotrienos excretados en orina (LTU) en estos pacientes, los cuales se correlacionarían con la severidad de la enfermedad. Objetivo: Determinar el nivel de LTU en niños con TRS e HAA antes y después de adenoamigdalectomía (AA), y en controles sanos. Correlacionar los niveles de LTU con los síntomas de TRS. Material y método: Estudio prospectivo. Se incluyeron pacientes con TRS e HAA (n =12) y controles sanos (n =12). Se determinó la concentración de LTU en ambos grupos de forma basal y un mes después de cirugía en el grupo con TRS. Resultados: No hubo diferencias en los niveles de LTU antes y después de AA. Tampoco existieron diferencias entre el grupo control y grupo TRS previo a la cirugía. No se encontró asociación entre LTU y la severidad de síntomas respiratorios. Conclusión: Los LTU no se encuentran elevados en pacientes con TRS e HAA, no disminuyen luego de AA y no se correlacionan con la severidad de los síntomas. La medición de LTU no sería una herramienta útil en la evaluación de pacientes con TRS. Nuevos estudios son necesarios para evaluar el rol de los leucotrienos en esta enfermedad.

ABSTRACT Introduction: Sleep disorder breathing (SDB) affects 2%-3% of the pediatric population, being adenotonsillar hyperplasia (ATH) its main cause. An increase in the levels of urinary leukotrienes (ULT) has been measured in these patients, which could be correlated with the severity of the disease. Aim: To determine the level of ULT in children with SDB and ATH before and after adenotonsillectomy, and healthy controls. To correlate the levels of ULT with symptoms of SDB. Material and method: prospective study. SDB and ATH patients (n =12) and healthy controls (n =12) were included. The concentration of ULT in both groups was determined, before surgery and after a month of surgery. Results: There were no differences in the levels of ULT before and after tonsillectomy in the studied group. There were also no differences between the control group and the SDB group. No association was observed between the level of ULT and the severity of respiratory symptoms. Conclusions: ULT are not elevated in patients with SDB and ATH and they do not decrease after adenotonsillectomy. ULT are not correlated with the severity of the symptoms of SDB. The measurement of ULT would not be a useful tool in the evaluation of patients with SDB. New studies are needed to assess the role of the role of leukotrienes in this disease.

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La apnea y eventos aparentemente letales poseen una gran diversidad etiológica por tanto exámenes complementarios podrían contribuir a su diagnóstico. El objetivo del presente estudio fue describir los resultados de estudios poligráficos de niños menores de 3 meses hospitalizados con sospecha de apnea. PACIENTES Y MÉTODO: Serie retrospectiva de casos. Se consideraron niños menores de 3 meses con sospecha de apnea y en quienes se realizó una poligrafía (PG) durante su hospitalización. Se registraron datos generales, así como también, el índice de apnea/hipopnea (IAH), índice de apnea central, índice de apnea obstructiva, saturación promedio y mínima. Como criterios de trastornos respiratorios del sueño (TRS) fueron considerados: índice de desaturaciones (ID) por debajo de 80% mayor 1 por hora; uno o más eventos de desaturaciones por debajo de 80% por más de 20 segundos; o un IAH mayor o igual 1. Se realizó estadística descriptiva y se determinó la posible asociación entre el IAH y parámetros de saturación. RESULTADOS: Ingresaron 51 pacientes, 32 varones. 8 (15,6%) presento PG alteradas, de ellos, en 5 coexistió más de un criterio diagnóstico. En el 15,6% se observó un IAH mayor o igual a 1, en el 7,8% se observó un índice de desaturación bajo 80% y en el 11,8% un índice de desaturación bajo 80% por más de 20 segundos. El IAH se asoció con los parámetros de saturación. CONCLUSIÓN: La mayoría de los pacientes presentó PG normales y entre los pacientes con TRS predominó un patrón poligráfico sugerente de inmadurez respiratoria, lo cual, es característico de esta edad.

Apnea and apparently lethal events have great etiological diversity thus complementary tests may help diagnosis. The aim of this study was to describe the results of polygraph studies of children under 3 months hospitalized with suspected apnea. PATIENTS AND METHODS: Retrospective case series. Children under 3 months with suspected apnea were considered and in whom a polygraphy (PG) was performed during hospitalization. General data, the apnea/hypopnea index (AHI), index of central. apnea, obstructive apnea index, average and minimum saturation were recorded. Desaturation index (ID) below 80% higher 1 per hour, one or more events of desaturation below 80% for more than 20 seconds or an AHI greater than or equal 1 were considered as criteria of sleep disorder breathing (SLB). Descriptive analysis was performed and the associations between AHI and saturation parameters were determined. RESULTS: 51 patients, 32 males, entered the study. 15,6% had altered PG. In 5 of them coexisted more than one diagnostic criterion. Iin 15,6% of the patients was observed an IAH greater 1, in 7.8% a desaturation index below 80% and in 11,8% a desaturation index under 80% for 20 seconds greater than 1. The AHI was associated with the parameters of saturation. CONCLUSION: Most of the patients had normal PG and among patients with a suggestive SLB a pattern of respiratory immaturity prevailed, which is characteristic of this age.

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BACKGROUND: The occurrence of central apneas when applying positive pressure (CPAP) to patients with obstructive sleep apnea syndrome (OSAS) is called complex sleep apnea (CompSA). This causes poor adherence to CPAP and persistence of symptoms. In Bogota, a city located at an altitude of 2640 m above sea level, chronic hypoxemia can generate certain instability of the respiratory system during sleep which could increase the presence of central apnea. The aim was to establish the prevalence of central apnea (central apnea index >5/h) in adults with moderate or severe OSAS during CPAP titration, and the factors associated with this. METHOD: Patients over 18 years old with OSAS were referred to the Fundacion Neumologica Colombiana Sleep Center, from January 2008 to June 2010. Polysomnogram (PSG) for CPAP titration was performed according to the American Academy of Sleep Medicine criteria. The prevalence was calculated and the clinical and baseline PSG factors associated with the CompSA were analyzed. RESULTS: We included 988 patients, 58% men. CompSA prevalence was 11.6%. Factors associated with CompSA were: central apneas in the baseline PSG (OR: 5.34 [3.49-8.16]), history of heart failure (OR: 2.53 [1.58-4.07]), and male sex (OR: 1.68 [1.06-2.69]). CONCLUSION: The prevalence of complex sleep apnea in Bogota (11.6%) was intermediate compared to the reported in lower altitudes. The factors associated with the development of CompSA were male sex, heart failure, and the presence of central apnea in the baseline PSG.

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