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Acta bioquím. clín. latinoam ; 44(1): 47-52, ene.-mar. 2010. tab
Article in Spanish | LILACS | ID: lil-633108

ABSTRACT

El objetivo de este trabajo fue evaluar la exactitud diagnóstica de un ELISA para anticuerpos antipéptidos de gliadina deamidados en pacientes con sospecha clínica de enfermedad celíaca (EC) y comparar su rendimiento con anticuerpos antiendomisio (EMA) y antitransglutaminasa tisular (a-Tgt). Se estudiaron 169 pacientes consecutivos (16 a 79 años), sometidos recientemente a biopsia duodenal, a los cuales se les determinó anticuerpos IgA EMA, IgA a-Tgt e IgG/IgA antipéptidos de gliadina deamidados (a-DGP Screen). Sesenta y cinco pacientes tuvieron algún grado de atrofia vellositaria y probable diagnóstico de EC (11 con atrofia vellositaria parcial, 30 subtotal y 24 total) y 104 con estructura vellositaria conservada. La sensibilidad, especificidad y exactitud diagnóstica de a-DGP Screen fue de 86,2%, 98,1% y 93,5% respectivamente, similar a EMA y a-Tgt. Al considerar sólo pacientes con atrofia vellositaria subtotal y total la sensibilidad fue estadísticamente superior en los 3 ensayos (100% para a-DGP Screen, p<0,014). Se observó una excelente concordancia entre a-DGP Screen con EMA (k= 0,99) y con a-Tgt (k = 0,97). El equipo a-DGP Screen demostró una elevada exactitud diagnóstica; su rendimiento fue equivalente a EMA y a-Tgt.


The aim of this study was to evaluate the diagnostic accuracy of an ELISA for antibodies to deamidated gliadin peptides in patients clinically suspected of having celiac disease (CD), and to compare this with antibodies to endomysium (EMA) and tissue transglutaminase (a-Tgt). One hundred and sixty-nine consecutive patients (16 to 79 yo) that had recently underwent small-bowel biopsy were included; serum samples were obtained for the measurement of IgA EMA, IgA a-Tgt and IgG/IgA antideamidated gliadin peptides (a-DGP Screen) antibodies. Sixty-five patients had some degree of villous atrophy with probable diagnostic of CD (11 partial, 30 subtotal and 24 total villous atrophy); 104 individuals had normal villous architecture. The sensitivity, specificity, and accuracy of a-DGP Screen were 86.2%, 98.1% and 93.5% respectively, similar to EMA or a-Tgt. When only patients with subtotal and total villous atrophy were considered, the sensitivity was statistically higher for the 3 tests (100% for a-DGP Screen, p<0.014). An excellent agreement was observed among a-DGP Screen with EMA (κ= 0,99) and with a-Tgt (κ = 0,97). The a-DGP Screen assay showed a high diagnostic accuracy with a performance equivalent to EMA or a-Tgt.


Subject(s)
Humans , Male , Female , Adolescent , Adult , Middle Aged , Aged , Immunoglobulin G/blood , Enzyme-Linked Immunosorbent Assay/methods , Celiac Disease/diagnosis , Quality Control , Immunoglobulin A/blood , Gliadin/blood
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