Browsing by Author "Hoyos-Bachiloglu, Rodrigo"

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    Association between obesity and atopic dermatitis in children: A case-control study in a high obesity prevalence population
    (2022) Iturriaga, Carolina; Bustos, María Francisca; Le Roy, Catalina; Rodríguez, Rocío; Cifuentes, Lorena; Silva-Valenzuela, Sergio; Vera-Kellet, Cristián; Cristi, Francisca; Pérez-Mateluna, Guillermo; Cabalín, Carolina; Hoyos-Bachiloglu, Rodrigo; Camargo Jr., Carlos A.; Borzutzky Schachter, Arturo
    Background/Objective: Atopic dermatitis (AD) is a chronic inflammatory skin disease. Research suggests an association between obesity and AD, although evidence is lacking from Latin American populations. This study evaluated the association of obesity with AD in children from Chile, a country with high obesity prevalence. Methods: A case-control study was performed in children with active AD (cases) and healthy controls (HCs) from Santiago, Chile. Body mass index was evaluated by z-score (z-BMI), with overweight defined as z-BMI ≥+1 and <+2, and obesity as z-BMI ≥+2. Abdominal obesity was defined by a waist circumference-to-height ratio (WHR) ≥0.5. AD severity was evaluated by Scoring AD (SCORAD) index. Results: A total of 174 children with AD and 101 controls were included. AD patients had similar overweight (27% vs. 28%) and obesity (21% vs. 26%) rates as HCs (p = .65). Abdominal obesity rates were also comparable (64% vs. 62%, p = .81). In sex-specific analyses, girls with AD had higher abdominal obesity rates than HCs (71% vs. 53%, p < .05) while boys with AD had lower abdominal obesity rates than HCs (53% vs. 75%, p = .03). Among children with AD, higher z-BMI or WHR did not correlate with higher SCORAD, eosinophil counts or total IgE. Conclusion: In our study, Chilean children with AD had high but similar rates of obesity as HCs, but showed sex-specific associations of abdominal obesity and AD. Further research is needed to evaluate these associations and the roles that weight excess and weight loss could play in the pathogenesis and treatment of AD.
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    Hypersensitivity reactions to measles-mumps-rubella vaccine in patients with IgE-mediated cow's milk allergy
    (American Academy of Allergy, Asthma and Immunology, 2020) Piñones, Mervin; Landaeta, María; Bustos, Paula; Toche, Paola; Morales, Pamela; Escobar, Carola; Borzutzky Schachter, Arturo; Hoyos-Bachiloglu, Rodrigo
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    Inmunodeficiencia combinada severa, reporte de pacientes chilenos diagnosticados durante el período 1999-2020
    (2020) Hoyos-Bachiloglu, Rodrigo; Rojas, Jorge; Borzutzky Schachter, Arturo; Hernández, Pamela; Vinet, Ana María; Bustos, Paula; Fernández, Fabiola; Lagos, Macarena; Strickler, Alexis; Marinovic, María Angélica; Casado, Cristina; Poli, María Cecilia; King, Alejandra
    La inmunodeficiencia combinada severa (IDCS) corresponde a una de las formas más graves de inmunodeficiencia primaria, existiendo escasos datos nacionales sobre ésta. Objetivo: describir la epidemiología, complicaciones, pronóstico y uso de la vacuna BCG en pacientes chilenos con IDCS. Pacientes y Método: Estudio retrospectivo de pacientes diagnosticados con IDCS entre los años 1999 y 2020 por médicos inmunólogos a lo largo de Chile. El diagnóstico de IDCS se realizó conforme a los criterios propuestos por Shearer: linfocitos T (CD3+) < 300 células/µL y proliferación 10% del límite de normalidad en respuesta a fitohemaglutinina o presencia de linfocitos T de origen materno. Se obtuvieron de la ficha clínica los datos correspondientes a: sexo, edad al diagnóstico, consanguinidad, región de origen, subpoblaciones linfocitarias, diagnóstico genético, complicaciones infecciosas y no infecciosas, vacunación BCG y sus complicaciones, edad de derivación al centro de TPH y causa de mortalidad no relacionada al TPH. Resultados: se diagnosticaron 25 casos de IDCS en 22 familias entre los años 1999-2020. 78% varones, la edad media a la primera manifestación fue 2.3 meses (0-7), mientras que la edad media al diagnóstico fue de 3.4 meses (0- 7). Un 16% de los casos tenía un antecedente familiar de IDCS. Un 40% de los casos fueron diagnosticados en la Región Metropolitana. El inmunofenotipo más frecuente fue T-B-NK+ (48%). Se realizaron estudios genéticos en 69,5% de los casos, siendo los defectos genéticos en RAG2 (39%) la causa más frecuente. Un 88% de los casos recibió la vacuna Bacillus Calmette-Guerin (BCG) previo al diagnóstico, incluidos 2 pacientes con historia familiar positiva, 36% de los vacunados experimentó complicaciones de la BCG. La edad media a la derivación a trasplante fue de 7,4 meses (5-16). De los 25 pacientes, 11 fallecieron previo a la derivación a un centro de trasplante. Conclusión: En Chile existe un retraso clínicamente significativo entre las primeras manifestaciones y el diagnóstico de IDCS, así como un importante retraso en la derivación a centros de trasplante. La mayoría de los pacientes con IDCS reciben la vacuna BCG, pese a tener antecedentes familiares, y experimentan frecuentemente complicaciones de la vacuna.
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    Refractory systemic juvenile idiopathic arthritis successfully treated with rapamycin
    (Oxford University Press, 2021) Concha, Sara; Rey-Jurado, Emma; Poli, M. Cecilia; Hoyos-Bachiloglu, Rodrigo
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    Universal Access to On-Demand Treatment of Patients with Hereditary Angioedema, the Chilean Experience
    (2023) Escobar, Juan J.; Aguirre, Joaquin; Ibanez, Samuel; Cid, Barbara J.; Campillay, Rolando; Gallardo, Ana Maria; Grau, Masumi; Hoyos-Bachiloglu, Rodrigo
    Background: In Chile, patients with hereditary angioedema (HAE) type I and type II are protected under Ley Ricarte Soto (LRS), which guarantees access to on demand plasma-derived C1-INH (pdC1-INH) since 2018. We aimed to analyze the first 3 years of LRS.Methods: Review of the LRS database between 2018 and 2021.Results: During the study period, 154 patients were covered by LRS, with an estimated prevalence of HAE in Chile at 0.8:100,000 inhabitants. A delay in diagnosis of 22 years was noted, 50 patients received epinephrine during an attack before the diagnosis of HAE. Mean number of attacks per year was 8, with 50% of adults and 42% of children experiencing more than 1 attack per month.Conclusion: Disease awareness must improve to reduce the diagnostic delay of HAE. Long-term prophylactic medications should be included in LRS to treat patients with high attack rates and control the costs of frequent on-demand treatment with pdC1-INH.