High altitude pulmonary edema in children: A systematic review.

INTRODUCTION: High altitude pulmonary edema (HAPE) is a form of acute noncardiogenic pulmonary edema caused by altitude-related hypoxia seen in children as well as in adults. In this systematic review we focus in HAPE occurring in children and adolescents. METHODS: A systematic review was conducted including publications in children 0-18 years of age from three databases up to June 2022. RESULTS: Thirty-five studies representing 210 cases were found. The mean age was 9.8 ± 3.6 years with a male/female ratio of 2.6. The peak age incidence was seen in children between 6 and 10 years old. Only two children (0.9%) were ≤2 years old. The mean altitude in 166 cases was 2861 masl. Only 17 cases (8.1%) occurred at altitudes below 2500 masl. Regarding the different HAPE subtypes there was a predominance of re-entry HAPE (R-HAPE) with 58%, followed by classic HAPE (C-HAPE) with 37.6%. The mean time between arrival and onset of symptoms was 16.5 h. The mortality rate was 1.4%. In 10/28 (36%) of C-HAPE cases there was a structural cardiac/pulmonary anomaly compared to 1/19 (5%) in R-HAPE (p < 0.01). HAPE recurrence was found in 46 cases (21.9%). The involvement in the chest X-rays was seen predominantly in the apices and in the right lung. CONCLUSIONS: R-HAPE was the most common HAPE subtype; HAPE peak age was found between 6 and 10 years of age; HAPE was more frequent in males and was rare in children under 2 years old; associated HAPE structural abnormalities were more common in C-HAPE than in R-HAPE.

Fisiología respiratoria. Neumología de altura: saturación de oxígeno, edema pulmonar y pruebas de función pulmonar / Respiratory physiology - High -altitude pneumology: oxygen saturation, pulmonary edema and pulmonary function tests

En las alturas, sobre todo a 2500 metros sobre el nivel del mar, la cantidad absoluta de oxígeno va decreciendo y por lo tanto la cantidad disponible para el intercambio gaseoso disminuye, produciéndose una vasoconstricción hipóxica pulmonar (VHP). La VHP asociada a la hipoxia hipobárica de la altura produce un aumento de la presión pulmonar que es mayor en los lactantes y a mayores alturas. No hay valores únicos de saturación de oxígeno (SatO2) en la altura, porque ésta va disminuyendo según el mayor nivel de altura, aumenta con la edad, y la brecha entre la vigilia y sueño es grande (sobre todo en los primeros meses de vida). El 25% de los niños sanos que viven en altura tienen valores de SatO2 significativamente menores que el 75% restante. Los valores normales de los índices de apnea/hipopnea son distintos a los de nivel del mar. El edema pulmonar de las alturas es una patología frecuente, que se produce por un incremento desproporcionado en la VHP reflejando una hiperactividad del lecho vascular pulmonar ante la exposición aguda a la hipoxia hipobárica. Tiene cuatro fenotipos, es infrecuente en menores de 5 años y rara vez es mortal, la sospecha clínica y el manejo oportuno con oxigeno es la clave. Finalmente, en la altura los valores normales de la función pulmonar de la espirometría, oscilometría de impulso y capacidad de difusión son distintos que a nivel del mar.

At high altitude, especially > 2,500 meters above sea level, the absolute amount of oxygen decreases and therefore the amount available for gas exchange decreases, producing hypoxic pulmonary vasoconstriction (VHP). VHP associated with high-altitude hypobaric hypoxia produces an increase in pulmonary pressure that is greater in infants and at higher altitudes. There are no single values of oxygen saturation (SatO2) at altitude, because it decreases with the highest level of altitude, increases with age, and the gap between wakefulness and sleep is large (especially in the first months of life). Around 25% of healthy children living at altitude have SatO2 values significantly lower than the remaining 75%. The normal values of the apnea/hypopnea indices are different from those at sea level. High altitude pulmonary edema is a frequent pathology that is produced by a disproportionate increase in VHP reflecting hyperactivity of the pulmonary vascular bed in the face of acute exposure to hypobaric hypoxia, it has four phenotypes, it is uncommon in children under 5 years of age, and it is rarely fatal, the clinical suspicion and timely management with oxygen is the key. Finally, at high altitude, the normal values of lung function from spirometry, impulse oscillometry, and diffusing capacity are different from those at sea level.

Normal values for respiratory sleep polygraphy in children aged 4 to 9 years at 2,560 m above sea level.

Obstructive sleep apnea syndrome affects 1%-4% of all children worldwide. Currently, diagnosis of obstructive sleep apnea is based on sea-level guidelines, without taking into account the altitude at which the populations live. It has been shown that at 3,200 m of altitude there is an increase in obstructive events in healthy children aged 7 to 16 years; on the other hand, it is known that SpO2 dispersion between individuals becomes wider as altitude increases, a phenomenon that is more marked during sleep. About 17 million Colombians live in regions between 2,500 m and 2,700 m, as do significant populations in other Latin American countries. This research aimed to characterize respiratory polygraphy sleep parameters in healthy, non-snoring children aged 4-9 years living at 2,560 m. We carried out home respiratory polygraphy in 32 children with a mean age of 6.2 years (range 4-9 years). The average recorded sleep time was 7.8 h, the median apnea-hypopnea index was 9.2/h, the obstructive apnea-hypopnea index had a median of 8.8/h (p5 4.2 to p95 17.9) and central apnea a median of 0.4/h. The median SpO2 was 93% (p5 90.5 to p95 94) and transcutaneous CO2 had a median of 39.4 mmHg (p531.7 to p95 42.3). The median oxygen desaturation index ≥ 3% was 11.2 and median oxygen desaturation index ≥ 4% was 3.9. Normal measurements for respiratory polygraphy obtained at sea level do not apply to children at altitude. If such guidelines are used, obstructive sleep apnea will be over-diagnosed, resulting in unnecessary adenotonsillectomies, among other interventions.

Breathing Patterns and Oxygenation Saturation During Sleep in Children Habitually Living at High Altitude in the Andes: A Systematic Review.

Background: Human respiratory physiology changes significantly in high altitude settings and these changes are particularly marked during sleep. It is estimated that 170 million people live above 2,500 m in environments where normal sleep parameters differ from those established at sea level or low altitude. Methods: We conducted a systematic review of publications reporting sleep studies in healthy children living at high altitude. For this purpose, data from PubMed, EMBASE, SciELO and Epistemomikos bases were retrieved up to August 2021. Results: Six articles met specified inclusion criteria; all reporting data were from South America involving 245 children (404 sleep studies) in children aged 0.6 months to 18 years, at altitudes between 2,560 to 3,775 m. The main results were: (1) Central apnea index decreased as the age increased. (2) The obstructive apnea/hypopnea index showed a bimodal profile with an increase in young infants up to age of 4 months, decreasing to 15 months of age, and then a second peak in children aged 4 to 9 years of age, dropping in older schoolchildren and adolescents. (3) Periodic breathing in the first months of life is more marked with increasing altitude and decreases with age. Conclusions: There are few studies of sleep physiology in children living at high altitude. The international parameters defining normal apnea indices currently used at low altitude cannot be applied to high altitude settings. The interpretation of sleep studies in children living at high altitude is complex because there are important developmental changes across childhood and a wide range of altitude locations. More normative data are required to determine thresholds for respiratory pathology at a variety of high altitude settings.

Late Diagnosis of Infants with PCD and Neonatal Respiratory Distress.

Neonatal respiratory distress (NRD) is common among infants with primary ciliary dyskinesia (PCD), but we do not know whether affected neonates receive a timely diagnosis. We used data from the international PCD cohort and assessed the proportion of patients with PCD who had a history of NRD and their age at diagnosis, stratifying by presence of laterality defects. First we analyzed data from all participants diagnosed after 2000, followed by individuals from a subgroup diagnosed using stricter criteria. Among the 1375 patients in the study, 45% had a history of NRD and 42% had laterality defects. Out of the 476 children with definite PCD diagnosis, 55% had a history of NRD and 50% had laterality defects. Overall, 30% of children with PCD were diagnosed during the first 12 months of life. This varied from 13% in those with situs solitus and no NRD, to 21% in those with situs solitus and NRD, 33% in those with situs anomalies but no NRD, and 52% in those with both situs anomalies and NRD. Our results suggest that we need to improve our knowledge of the neonatal presentation of infants with PCD and apply it so that these patients will receive appropriate care sooner.

Oxygen Saturation in Childhood at High Altitude: A Systematic Review.

Background: It is well known that oxygen saturation as measured by pulse oximetry (SpO2) decreases as altitude increases. However, how SpO2 changes across childhood, and more specifically during sleep/wake states, at different high altitudes are less well understood. We aimed to perform a systematic review of all studies with direct SpO2 measurement in healthy children living at high altitude (>2500 meters above sea level) to address these questions. Methods: MEDLINE, EMBASE, and SciELO databases were searched up to December 2018. Two independent reviewers screened the literature and extracted relevant data. Results: Of 194 references, 20 studies met the eligibility criteria. Meta-analysis was not possible due to the use of different oximeters and/or protocols for data acquisition and reporting of different SpO2 central tendency and dispersion measures. The most relevant findings from the data were: (1) SpO2 is lower as altitude increases; (2) at high altitude, SpO2 improves with age through childhood; (3) SpO2 is lower during sleep and feeding in comparison to when awake, this SpO2 gap between wake and sleep states is more evident in the first months of life and narrows later in life; (4) SpO2 dispersion (interindividual variation) is higher at younger ages, and more so during sleep; (5) In 6/20 studies, the SpO2 values were nonnormally distributed with a consistent left skew. Conclusions: At high altitude, the mean/median SpO2 increases in children with aging; a significant gap between wake and sleep states is seen in the first months of life, which narrows as the infant gets older; SpO2 dispersion at high altitude is wider at younger ages; at high altitude, SpO2 shows a nonnormal distribution skewed to the left; this bias becomes more evident as altitude increases, at younger ages and during sleep.

Saturación de oxígeno, respiración periódica y apnea durante el sueño en lactantes de 1 a 4 meses a 3200 metros de altura / Oxygen saturation, periodic breathing, and sleep apnea in infants aged 1-4 months old living at 3200 meters above sea level

Objetivos: describir, en niños de 1-4 meses, a 3200 m de altura, la saturación de oxígeno (SpO2), los índices de apnea y la respiración periódica (RP) durante el sueño. Se realizaron polisomnografías en 18 lactantes sanos. Resultados: las medianas fueron de 87% para la SpO2 y de 7,2% para la RP del tiempo total de sueño. El índice de apnea central tuvo una mediana de 30,5 /hora, que disminuyó a 5,4/hora al descontar las apneas asociadas a RP. El p5 de la SpO2 para niños despiertos fue de 76% y, para niños dormidos, de 66%. Conclusiones: la SpO2 fue inferior a la del nivel del mar y la RP y el índice de apnea central, mayores; al descontar las apneas centrales asociadas a RP. Este último, fue similar a la del nivel del mar. A 3200 m, se requieren puntos diferentes para la SpO2 normal, uno para niños despiertos y otro si están dormidos.

Objectives: To describe, in infants aged 1-4 months old living at 3200 meters above sea level (MASL), oxygen saturation (SpO2), sleep apnea indices, and periodic breathing (PB) during sleep. Polysomnographies were done in 18 healthy infants. Results: The median SpO2 was 87%, and the median PB was 7.2% for the total sleep time. The median central sleep apnea index was 30.5/hour, which decreased to 5.4/hour once sleep apneas associated with PB were excluded. The 5th percentile for SpO2 was 76% among awake infants, and 66% among asleep infants. Conclusions: The SpO2 was lower than that observed at sea level, whereas PB and the central sleep apnea index were higher, once sleep apneas associated with PB were excluded. The latter was similar to that observed at sea level. At 3200 MASL, different cut-off points are required for a normal SpO2, one for infants during the waking state and one for infants during sleep.

Oxygen saturation, periodic breathing, and sleep apnea in infants aged 1-4 months old living at 3200 meters above sea level. / Saturación de oxígeno, respiración periódica y apnea durante el sueño en lactantes de 1 a 4 meses a 3200 metros de altura.

OBJECTIVES: To describe, in infants aged 1-4 months old living at 3200 meters above sea level (MASL), oxygen saturation (SpO2), sleep apnea indices, and periodic breathing (PB) during sleep. Polysomnographies were done in 18 healthy infants. RESULTS: The median SpO2 was 87%, and the median PB was 7.2% for the total sleep time. The median central sleep apnea index was 30.5/hour, which decreased to 5.4/hour once sleep apneas associated with PB were excluded. The 5th percentile for SpO2 was 76% among awake infants, and 66% among asleep infants. CONCLUSIONS: The SpO2 was lower than that observed at sea level, whereas PB and the central sleep apnea index were higher, once sleep apneas associated with PB were excluded. The latter was similar to that observed at sea level. At 3200 MASL, different cut-off points are required for a normal SpO2, one for infants during the waking state and one for infants during sleep.

Objetivos: describir, en niños de 1-4 meses, a 3200 m de altura, la saturación de oxígeno (SpO2 ), los índices de apnea y la respiración periódica (RP) durante el sueño. Se realizaron polisomnografías en 18 lactantes sanos. Resultados: las medianas fueron de 87% para la SpO2 y de 7,2% para la RP del tiempo total de sueño. El índice de apnea central tuvo una mediana de 30,5/hora, que disminuyó a 5,4/hora al descontar las apneas asociadas a RP. El p5 de la SpO2 para niños despiertos fue de 76% y, para niños dormidos, de 66%. Conclusiones: la SpO2 fue inferior a la del nivel del mar y la RP y el índice de apnea central, mayores; al descontar las apneas centrales asociadas a RP. Este último, fue similar a la del nivel del mar. A 3200 m, se requieren puntos diferentes para la SpO2 normal, uno para niños despiertos y otro si están dormidos.

Coadministration of a 9-Valent Human Papillomavirus Vaccine With Meningococcal and Tdap Vaccines.

BACKGROUND: This study in 11- to 15-year-old boys and girls compared the immunogenicity and safety of GARDASIL 9 (9-valent human papillomavirus [9vHPV] vaccine) administered either concomitantly or nonconcomitantly with 2 vaccines routinely administered in this age group (Menactra [MCV4; Neisseria meningitidis serotypes A/C/Y/W-135] or Adacel [Tdap; diphtheria/tetanus/acellular pertussis]). METHODS: Participants received 9vHPV vaccine at day 1 and months 2 and 6; the concomitant group (n = 621) received MCV4/Tdap concomitantly with 9vHPV vaccine at day 1; the nonconcomitant group (n = 620) received MCV4/Tdap at month 1. Antibodies to HPV-, MCV4-, and Tdap-relevant antigens were determined. Injection-site and systemic adverse events (AEs) were monitored for 15 days after any vaccination; serious AEs were monitored throughout the study. RESULTS: The geometric mean titers for all HPV types in 9vHPV vaccine 4 weeks after dose 3, proportion of subjects with a fourfold rise or greater in titers for 4 N meningitidis serotypes 4 weeks after injection with MCV4, proportion of subjects with antibody titers to diphtheria and tetanus ≥0.1 IU/mL, and geometric mean titers for pertussis antigens 4 weeks after injection with Tdap were all noninferior in the concomitant group compared with the nonconcomitant group. Injection-site swelling occurred more frequently in the concomitant group. There were no vaccine-related serious AEs. CONCLUSIONS: Concomitant administration of 9vHPV vaccine with MCV4/Tdap was generally well tolerated and did not interfere with the antibody response to any of these vaccines. This strategy would minimize the number of visits required to deliver each vaccine individually.

Oxygen saturation, periodic breathing and apnea during sleep in infants 1 to 4 month old living at 2,560 meters above sea level.

UNLABELLED: There are few data in the literature related to polysomnography in infants in altitudes from 2,200 m to 2,800 m. The main objective of this investigation was to describe oxygen saturation (SpO2) levels during sleep in infants aged between 1 and 4 months living at an altitude of 2,560 m. The secondary objectives were the description of periodic breathing (PB) and apnea indexes. Polysomnography was performed in 35 healthy infants 1-4 months in Cuenca (Ecuador) at 2,560 m. The median for SpO2 was 92% and 4.9% for PB. The median for the central apnea index was 23.7/hour and 15.4/hour when related to PB. No correlation was found between PB and SpO2. CONCLUSION: SpO2 was lower than the values at sea level and PB and central apnea index were higher. When apneas associated with PB were not considered, the central apnea index was similar to that found at sea level.

Estudio analítico del resultado del embarazo en adolescentes y mujeres de 20 a 29 años en Bogotá / Analytic study of the pregnancy outcome comparing adolescent women and women between 20 to 29 years of age in Bogotá (Colombia)

Objetivo: investigar la asociación del embarazo en la mujer adolescente con un resultado adverso en la morbilidad materna y del recién nacido. Métodos: estudio poblacional de cohorte. Se tomó la base de datos de la Red Perinatal de la Secretaría de Salud de Bogotá, en la cual están registrados los datos de atención del embarazo y parto de los hospitales públicos adscritos. Se incluyeron mujeres nulíparas enre 10 y 29 años atendidas entre el 1 de septiembre de 1998 al 31 de diciembre de 1999 en la red de hospitales adscritos a la Secretaría de Salud de Bogotá (n=8.045). En el análisis se estableció si había asociación de la edad con cada una de las variables analizadas, mediante el cálculo de riesgo relativo (RR). Se reportan los RR con sus respectivos intervalos de confianza (IC). Los desenlaces evaluados fueron la vía de terminación del parto, ruptura prematura de membranas, pre-eclampsia, peso del recién nacido, prematurez, peso para la edad gestacional, enfermedad de la membrana hialina y puntaje de Apgar a los 5 minuto. Resultados: el ser adolescente es un factor protector que disminuye el riesgo de terminación de parto por cesárea (RR 0,85 IC95 por ciento 0,78-0,93) y de presentar preeclampsia (RR 0,65; IC95 por ciento 0,46-0,91). No se observó ninguna asociación respecto a la ruptura prematura de membranas. Se observó un incremento significativo de la morbilidad neonatal en las madres menores de 15 años. Variables que demostraron relación con la edad materna fueron prematurez (RR 1,88 IC95 por ciento 1,14-3,11), pequeño para la edad gestacional (RR 2,09; IC95 por ciento 1,24-3,52) y bajo peso (RR 1,61 IC 95por ciento 1,12 - 2,32). Conclusiones: en el análisis por grupos de edad las adolescentes de 10 a 19 años tienen una menor probabilidad de requerir cesárea y de presentar hipertensión inducida por el embarazo, que las mujeres entre 20 y 29 años. Los recién nacidos de adolescentes menores de 15 años tienen riesgos significativamente mayores de presentar prematurez, bajo peso y de ser pequeños para la edad gestacional, en comparación con los neonatos de madres de 15 a 29 años.

Complicaciones de la caterización venosa central según la vía de inserción en pacientes pediátricos / Complications of central venous catherization according to site of insertion in pediatric patients

Objetivos: comparar el riesgo de presentar complicaciones mecánicas e infecciosas entre las vías superiores (subclavias y yugulares internas) y las vías inferiores (femoral). Materiales y métodos: estudio analítico de cohortes. En forma prospectiva se recolectó la información correspondiente. Población de estudio: pacientes menores de 16 años hospitalizados en la Fundación Santa Fe de Bogotá (FSFB) entre 01/01/91 y 31/12/02 con catéter venoso central (CVC) por vías yugular, subclavia y femoral. Resultados: se estudiaron en total 1475 CVC, 535 a través de las venas superiores, 134 (25 por ciento) insertados por vena subclavia (VS) y 401 (75 por ciento) por vena yugular interna (VYI). El riesgo de desarrollar Bacteriemia relacionada con el CVC (BRC) fue 1,8 por ciento (18/996) para los insertados por vía superior y 3,13 por ciento (15/479) para los insertados por vía inferior, (p=0,10). La incidencia de trombosis fue 0 por ciento en los catéteres superiores (0/996) en contraste con 1,2 por ciento (6/479) de los catéteres inferiores (P=0,00 04). Conclusiones: el riesgo de presentar complicaciones mecánicas fue similar en nuestro estudio entre las vías yugular y subclavia, el riesgo de presentar BRC no difirió entre los abordajes superior e inferior, el riesgo de trombosis venosa fu e estadísticamente más alto con los catéteres femorales aun que la relevancia clínica de esta diferencia es discreta

Calendario y variación estacional de las afecciones respiratorias en Santa Fe de Bogotá / Seasonal variation of respiratory diseases in Santa Fe de Bogotá

Introducción: Las infecciones respiratorias bajas (laringotraqueítis, bronquiolitis y neumonía) y el asma son responsables de un alto porcentaje de la morbimortalidad de la población pediátrica. El conocimiento de su calendario y patrón estacional es importante por las implicaciones que tiene en la planificación de salud. Santa Fe de Bogotá, con 6 millones de habitantes, tiene características geográficas y climatológicas muy particulares, pués encontrándose en el trópico, está a 2640 m de altura. La presente investigación tuvo como objetivo el conocimiento del calendario y patrón estacional de las enfermedades arriba mencionadas en la ciudad de Santa Fe de Bogotá. Material y métodos: Se analizaron 3193 consultas al servicio de urgencias de la Fundación Santa Fe de Bogotá, entre 1990 y 1994. El calendario obtenido se correlacionó con las variaciones de siete indicadores climatológicos evaluados en la ciudad durante los mismos años. Conclusión: Los resultados de esta investigación indican que las afecciones respiratorias más comúnes en la población pediátrica en Santa Fe de Bogotá aparecen todos los años con un mismo patrón. El período más crítico es el comprendido entre abril y mayo. La época de la epidemia de bronquitis no coincide con la del hemisferio norte ni con la del hemisferio sur, como tampoco con lo descrito en otras zonas ecuatoriales del mundo

Estudios moleculares en pacientes colombianos con Fibrosis quística

La fibrosis quística (FQ), la enfermedad autosómica recesiva más frecuente en poblaciones caucásicas, tiene una incidencia promedio de 1/2.500 recién nacidos

ALTE: evaluación de 22 casos

Se describen 22 niños con ALTE, sigla que en inglés define un episodio de aparente amenaza a la vida, estudiados entre el 1o de enero de 1989 y el 30 de junio de 1991. Fueron valorados mediante neumocardiografía, electroencefalograma, imagenología para reflujoy otros exámenes según la clínica del paciente. En 32 por ciento de los niños se llegó al diagnóstico definitivo de apnea infantil, en 23 por ciento al de reflujo, en 23 por ciento al de infección respiratoria viral y en 25 por ciento se llegó a otros diagnósticos. Los pacientes recibieron tratamiento habitual de acuerdo a la patología diagnosticada, siete niños fueron monitorizados en el hogar y 11 recibieron teofilina. Ningún paciente murió. Se concluye que los niños que se presentan con episodio de ALTE deben ser exhaustivamente evaluados para identificar la causa y evaluar el posible tratamiento. La combinación de monitorización en el hogar, teofilina o tratamiento específico puede resultar salvadora para estos infantes.