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Background: Asthma is a multifactorial chronic disease, whose most frequent etiology is allergy, especially to Blomia tropicalis . In French Guiana, the childhood prevalence of Blomia T sensitization is unkwown. The aim of this study was to determine the proportion of sensitization to Blomia T and other mites in asthmatic children, and to describe the characteristics of childhood asthma in French Guiana., Methods: A retrospective cohort study focused on children from 0 to 18 years of age, followed for asthma at the Department of Pediatrics of the Cayenne Hospital Center in French Guiana. All asthmatic children followed by the same paediatric allergist were systematically skin-tested with Bt total extract, and Bt-specific IgE tests were additionally performed to confirm specific sensitization. All follow-up variables were collected from medical records. The outcome was sensitization to Blomia tropicalis and other allergens, and the explanatory variables were those of asthma follow-up. Patients were categorized into Blomia tropicalis sensitization yes/no. Logistic regression analysis was used to assess the relationship between follow-up variables and the outcome., Results: 302 patients were followed: 177 cases of allergic rhinitis, 135 allergic conjunctivitis, 105 atopic dermatitis, 153 food allergy, and 14 cases of drug allergy. Poly-allergy (respiratory, food, skin, and medicinal) was present in 239 children. There were 158 children followed for asthma, of whom 103 (65%) were sensitized to Blomia tropicalis . The median age of the asthmatic children sensitized to Blomia tropicalis was 7 years, and 3 years for those who were not sensitized ( p < 0.001). Among the girls ( n = 58), 67% were sensitized to Blomia ; 97 (92%) asthmatic children co-sensitized to Blomia tropicalis , Dermatophagoides pteronyssinus, and Dermatophagoides farinae . Multivariate analysis showed that the childhood asthma in French Guiana is characterized by a median age of 7 years ( p < 0.001), a high prevalence of Blomia tropicalis ( p < 0.001), co-sensitization to other mites (p < 0.001), and a high prevalence of co-sensitization to cockroaches ( p = 0.006). The area under the ROC curve was close to 0.9, confirming the quality of our model., Conclusion: In French Guiana, asthma is characterized by a high prevalence of Blomia tropicalis sensitization., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2023 Maniassom, Defo, De Blay and Elenga.)

Objectives: This cross-sectional study aimed to investigate the influence of haplotypes, alpha-gene status and UGTA1 polymorphism on the severity of sickle cell disease in children., Methods: This cross-sectional study was conducted between 2012 and 2014 at the Cayenne Hospital, in French Guiana. Acute clinical complications were grouped into (i) severe SCD defined by the presence of stroke and/or abnormal-transcranial Doppler (TCD), (ii) moderate SCD defined by the presence of at least three annual events requiring hospitalization and/or at least one acute chest syndrome, (iii) no severe SCD (in the absence of the precited events)., Results: Among the 86 patients, 33.7% were female with a median age of 10 years (range: 6-12 years). The vast majority of patients had SCA (HbSS) phenotype (74.4%; n = 64). The severe haplotype was found in 40% of patients. 30% were BEN/BEN. Analysis of α-globin gene deletions revealed that 32 patients (37.2%) were heterozygous (loss of 2 genes in 2 cases and loss of 1 gene in 30 cases) for α-thalassemia (3.7 kb deletion). Homozygous (TA) n TA7/7 was found in 24 (28%). In the multivariate analysis, the factors associated with the severity of sickle cell disease were the first vaso-occlusive crisis before one year of age (OR 25, [95% CI = 6.0-107.0], p<0.001) and a baseline MCV >80 fL (OR 0.20 [95% CI = 0.04-0.96], p = 0.04). The area of the ROC curve was 0.90., Conclusion: Prospective studies with greater statistical power would provide more knowledge on the relationship between UGT1A1 mutations and the clinical and hematological manifestations of SCA., Competing Interests: The authors have declared that no competing interests exist.

Background: This study aims to describe the predictive factors of severe obesity in children followed in French Guiana., Methods: In this observational study, the patients from the French Guianese Childhood Obesity Group database were prospectively included, after giving a statement of patient's non opposition., Results: Our group classifications revealed that 36 of 150 (24%) participants were classified as being metabolically abnormal obesity" (MAO), while 114 of 150 (76%) were categorized as metabolically normal obesity" (MNO). MAO-patients were older. Their mothers had more severe obesity. We also observed that their systolic blood pressure was higher. The median Z-score BMI of children with MAO was 4, 9 [4, 05-5, 38], which shows a more obese condition than the MNO group. The median waist-to-height ratio (WTHR) of our study population was high, either 0.63 [0.54-0.59]. No significant differences in the term of pregnancy, father's obesity, gender, birth weight, feeding, diastolic blood pressure and WTHR were found between the two groups. The predictors of MAO status, after adjusting for age and sex, were mother's obesity and high child's waist circumference. Among the comorbidity, there were two Down syndrome, one Cornelia de Lange syndrome, one Nephrotic Syndrome and one Epilepsy. The leptin hormone and insulin levels were higher in MAO than in MNO, while 25-OH D-vitamin was higher in MNO., Conclusion: This study indicates the need to incorporate waist circumference into routine clinical practice, in addition to traditional measures of weight, height, body mass index and waist-to-height ratio.