Joyce W Yu

McGill University Health Centre, Montréal, Quebec, Canada

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Publications (5)30.54 Total impact

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    ABSTRACT: Peanut allergy accounts for most severe food-related allergic reactions, and accidental exposures are frequent. Delayed administration of epinephrine and the allergic individual's failure to personally carry epinephrine contribute to fatal outcomes. To describe epinephrine autoinjector availability at school and to determine factors that might affect autoinjector availability in children allergic to peanut. Two hundred seventy-one children with peanut allergy living in Quebec were queried about their autoinjector. Logistic regression models were used to select factors associated with device availability. Four of 271 children diagnosed as having peanut allergy were not prescribed autoinjectors. Forty-eight percent of the children did not carry the autoinjector with them at school. In 78.0% of those, the autoinjector was located in the nurse's or another school office, which was staffed by a full-time nurse only in 18.5%. Of all the respondents, those administered epinephrine for a previous reaction (odds ratio [OR], 2.7; 95% confidence interval [CI], 1.3-5.7), older children (OR, 1.1; 95% CI, 1.0-1.2), and those living only with their mother (OR, 3.4; 95% CI, 1.0-11.0) were more likely to carry the autoinjector with them at school. Of children 7 years or older, those who experienced a severe reaction were more likely to carry their autoinjector (OR, 3.3; 95% CI, 1.4-8.1). Almost 50% of children allergic to peanut might experience a delay in anaphylaxis treatment due to limited access to their device. More education is required regarding the importance of a readily available autoinjector.
    No preview · Article · Jul 2008 · Annals of allergy, asthma & immunology: official publication of the American College of Allergy, Asthma, & Immunology
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    ABSTRACT: Following outbreaks of meningococcal disease in Quebec in 1991-1993 and 2000-2001, a mass vaccination campaign was performed. In 2001-2002, children aged 2 months to 20 years were immunized with the Meningococcal CRM197 vaccine (Menjugate). We examined the response of pediatric oncology patients during or following maintenance chemotherapy and post-bone-marrow transplantation to Meningococcal C vaccine. This was an open label descriptive study of a cohort of patients from the oncology clinic at the Montreal Children's Hospital. A positive vaccine response was defined as a fourfold increase in specific IgG from baseline and a bactericidal assay using human complement (hBCA) titer >1:4. Of the 25 patients with ALL, 13 had a serologic response (average 60-fold increase). The serologic responders had a higher mean B cell count (0.262) compared to non-responders 0.068 x 10.9/L [t(23) = 2.843 (P < 0.05)]. Eleven of the 12 non-responders and 4 of the responders were on maintenance chemotherapy. In addition, two of the five patients post-bone-marrow transplant, responded. Fifteen of the 34 patients (44%) had an adequate hBCA response (mean titer 61). The group included 14/18 serologic responders with hBCA response (P < 0.001) and 16/17 non-serologic responders with no hBCA response (P < 0.001). Meningococcal C-conjugate vaccine produced variable responses in children with common cancers. Proximity to chemotherapy and total B cell number may help predict likelihood of response.
    Full-text · Article · Dec 2007 · Pediatric Blood & Cancer
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    ABSTRACT: Accidental exposure to peanut has been reported to occur frequently. Total avoidance of peanut is difficult because of its widespread use, manufacturing and labeling errors, utensil contamination, and label misinterpretation. Given the apparent increased awareness of peanut allergy by both consumers and food manufacturers, we aimed to determine the current frequency of accidental exposures occurring in peanut allergic children in Quebec and to identify factors associated with exposure. The parents of children with peanut allergy diagnosed at the Montreal Children's Hospital completed questionnaires about accidental exposure to peanut occurring over the period of the preceding year. Logistic regression was used to identify associated factors. Of 252 children, 62% were boys, with a mean age of 8.1 years (SD, 2.9). The mean age at diagnosis was 2.0 years (SD, 2.1). Thirty-five accidental exposures occurred in 29 children over a period of 244 patient-years, yielding an annual incidence rate of 14.3% (95% CI, 10.0% to 19.9%). Fifteen reactions were mild, 16 moderate, and 4 severe. Of 20 reactions that were moderate to severe, only 4 received epinephrine. Eighty percent of children attended schools prohibiting peanut, and only 1 accidental exposure occurred at school. No associated factors were identified. Accidental exposure to peanut occurs at a lower frequency than previously reported, but most reactions are managed inappropriately. Enhanced awareness, access to safer environments, and good food manufacturing practices may have contributed to a lower incidence of inadvertent peanut exposure, but a further reduction and better education on allergy management are desirable.
    No preview · Article · Sep 2006 · Journal of Allergy and Clinical Immunology
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    ABSTRACT: Cow's milk allergy is one of the most common allergies in infancy. It has an excellent prognosis since most cases resolve by 4 years of age. The complications associated with milk allergy include delayed growth and atopic conditions, such as asthma, allergic rhinitis, atopic dermatitis, and other food allergies. To report a case of vitamin D deficiency rickets in a 2-year-old boy with cow's milk allergy. We describe a patient with clinical and biochemical evidence of rickets, including decreased serum calcium, phosphate, and 25-hydroxy vitamin D levels and an elevated alkaline phosphatase level. A dietary history revealed the prolonged absence of dietary vitamin D because the child did not tolerate cow's milk. Skin prick testing and measurement of specific IgE to cow's milk were performed to determine whether there was an allergy to cow's milk. Results of skin prick testing and measurement of specific IgE to cow's milk confirmed an IgE-mediated sensitivity to cow's milk. Introduction of appropriate supplementation into the child's diet resulted in complete resolution of his symptoms. This case emphasizes that the management of cow's milk allergy involves strict avoidance of the allergenic food while also ensuring that essential dietary requirements are met. A dietary history is crucial at all pediatric visits, and inquiry about supplementation of vitamins and minerals is important, especially in children with food allergies.
    No preview · Article · May 2006 · Annals of allergy, asthma & immunology: official publication of the American College of Allergy, Asthma, & Immunology

  • No preview · Article · Nov 2005 · Journal of Allergy and Clinical Immunology