Ana I Tabar-Purroy

Hospital Virgen del Camino, Cádiz, Andalusia, Spain

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Publications (3)22.05 Total impact

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    ABSTRACT: Occupational asthma (OA) caused by carmine (E-120) has been reported. We sought to evaluate the prevalence of sensitization and OA at a natural dye processing factory in which 2 workers had been given a diagnosis of carmine-induced OA 6 years previously. The 24 current employees and one worker who had recently left work because of asthma completed a questionnaire and underwent skin testing (carmine, cochineal, carminic acid, curcuma, annato, and chlorophyll), carmine IgE dot-blot analysis, and methacholine inhalation testing. Workers exhibiting positive occupational skin test responses, work-related asthma, or bronchial hyperresponsiveness underwent specific inhalation challenge and serial peak expiratory flow rate recording. Positive skin test responses to carmine (41.7%), cochineal (29.2%), and carminic acid (4.2%) were observed. Carmine IgE dot-blot results were positive in 4 subjects. No difference in atopy or smoking was observed between occupationally sensitized and nonsensitized subjects. Among the 5 employees reporting work-related asthma, 2 had positive skin test responses, and 4 had bronchial hyperresponsiveness. Five subjects underwent specific inhalation challenges: 2 workers had early asthma responses to carmine and cochineal challenges, and the remaining subjects did not have suggestive peak expiratory flow recordings. The subject who had left his job was given a diagnosis of carmine-induced OA. The prevalence of sensitization and OA caused by carmine was 41.6% and 8.3%, respectively. When the 3 workers who had left their jobs were included, the cumulative incidence of sensitization and OA was 48.1% and 18.5%, resembling the healthy worker effect. Prevention programs to establish the permissible levels of airborne allergen should be implemented.
    No preview · Article · Mar 2003 · Journal of Allergy and Clinical Immunology
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    ABSTRACT: Asthma and rhinitis frequently coexist in allergic patients, but nasal symptoms may predominate, leading to asthma underdiagnosis and undertreatment. Discriminant analysis obtains the best differentiation between groups using one or one set of variables. Our aim was to identify the laboratory test [allergen exposure, total and specific serum IgE, lung function, blood eosinophils and, bronchial response and sensitivity to methacholine (Mth) and allergen] or combination of them that allowed the best differentiation between mild asthma and allergic rhinitis. A cross-sectional analysis was performed in 86 Dermatophogoides pteronyssinus allergic rhinitis patients, who were classified according to clinical data as rhinitis plus mild asthma (n = 62) or "pure" rhinitis (n = 24). Bronchial symptoms had been exhaustively evaluated during a 2-years pre-inclusion period. Patients underwent skin tests and bronchial challenge with Mth and allergen. The exposure to D. pteronyssinus allergen (Der pl) was quantified in dust samples. Dose-response curves with Mth [until the FEV1 fell by 40% or the maximal dose (200 mg/ml) was inhaled] were attained. We developed multiple models of discriminant analysis in order to evaluate the capacity of the above variables to differentiate groups. Asthma patients had higher total and specific IgE levels and a greater sensitivity (PD20 values) and response [dose-response slope (DRS)] to both Mth and allergen. The model entering these variables was the one that correctly classified more patients (79.2%). The discriminative power of the model that only included Mth-DRS values was similar to the above (78.8%). Bronchial response to Mth is quantitatively different in allergic rhinitis patients who display mild asthma symptoms when compared to those that only report rhinitis, suggesting a distinct bronchial intrinsic behavior. The utilization of complete dose-response curves with Mth allows a good separation between mild asthma and "pure" rhinitis patients and might be useful in the diagnosis of mild asthma. Whether the early detection and treatment of these patients prevents the development of symptomatic asthma needs further evaluation.
    Full-text · Article · Feb 2003 · Respiratory Medicine
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    ABSTRACT: To examine the baseline factors influencing the occurrence and magnitude of immediate- and late-phase responses in asthmatic patients after an allergen-induced bronchial provocation test (A-BPT). Cross-sectional analysis in a homogenous group of 31 mild, Dermatophagoides pteronyssinus-allergic patients with asthma. Allergy Department, Hospital Virgen del Camino, Pamplona, Spain. Patients completed an asthma symptom questionnaire and underwent skin tests, sputum induction, and methacholine bronchial provocation test. The A-BPT was performed on a separate day. Sputum cell profile and eosinophil cationic protein (ECP), tryptase, albumin, and interleukin-5 levels were quantified in the entire sputum supernatant. Assays were done for eosinophils in blood, and/or ECP, and total and specific IgE levels in serum. Exposure to D pteronyssinus major allergens (Der p1 and Der 2) was measured by an assay based on monoclonal antibodies. A-BPT findings were positive in all patients, and late-phase responses were detected in 29%. Late responders were exposed to higher levels of Der p1 (p = 0.028), had greater levels of ECP (p = 0.007) and albumin (p = 0.019) in sputum, and showed a trend toward higher lymphocyte numbers (p = 0.053) in sputum than isolated early responders. The allergen-induced provocative dose that induced a fall in FEV(1) values > or =20% from the postdiluent values correlated with bronchial hyperresponsiveness (r = 0.36). The late-phase response magnitude correlated with Der p1 exposure (r = 0.49) and showed a trend toward correlation with sputum ECP levels (r = 0.38). Factors involved in the development of allergen-induced immediate- and late-phase responses are different. Allergen natural exposure might prime the infiltration of the airway by activated inflammatory cells enhancing the appearance and the severity of late-phase responses.
    No preview · Article · Jan 2001 · Chest