[Activity of chronic spontaneous urticaria in euthyroid vs hypothyroid patients]

Rev Alerg Mex. 2020 Apr-Jun;67(2):112-118. doi: 10.29262/ram.v67i2.635.
[Article in Spanish]

Abstract

Background: Chronic urticaria (CU) affects 5 % of the general population and it is associated with thyroid disease in up to 54 % of patients. There is scarce information on the activity of urticaria in patients with and without alterations in the thyroid function.

Objective: To compare the activity rate of urticaria using the UAS7 (Urticaria Activity Score 7) in patients with and without hypothyroidism.

Methods: A descriptive, cross-sectional, and comparative study of patients with CSU (chronic spontaneous urticaria) who were older than 18 years of age, who were classified into two groups based on their thyroid function: hypothyroid and euthyroid patients. UAS7 was applied to all of them.

Results: We analyzed 60 patients with CSU; 30 of them were euthyroid and 30 were hypothyroid. The female sex was predominant (76 %) and the average age was 49.1 years old. The activity in 40 % was moderate, in 25 % was severe, and it was mild in 23 %; only 12 % of them were controlled. In the group with hypothyroidism, the median TSH (Thyroid Stimulating Hormone) was of 6.8 μUI/mL. No statistically significant differences were found in matters of age, body mass index, comorbidities, or in the UAS7.

Conclusions: We did not find a statistically significant difference in the Urticaria Activity Index between both groups. Identifying the influencing factors shall improve the quality of life of patients.

Antecedentes: La urticaria crónica afecta a 5 % de la población general y se asocia a enfermedad tiroidea hasta en 54 % de los pacientes. Existe escasa información de la actividad de la urticaria en los pacientes con y sin alteraciones de la función tiroidea. Objetivo: Comparar el índice de actividad de la urticaria con el UAS7 (Urticaria Activity Score 7) en pacientes con y sin hipotiroidismo. Métodos: Estudio descriptivo, transversal y comparativo de pacientes con urticaria crónica espontánea > 18 años, clasificados en dos grupos según su función tiroidea: con hipotiroidismo y eutiroideos. A todos se les aplicó el UAS7. Resultados: Se analizaron 60 pacientes con urticaria crónica espontánea, 30 eutiroideos y 30 hipotiroideos. Predominó el sexo femenino (76 %), la edad promedio fue de 49.1 años; 40 % tenía actividad moderada, 25 % grave, 23 % leve y 12 % estaba controlado. En el grupo con hipotiroidismo, la mediana de hormona estimulante de la tiroides fue de 6.8 μUI/mL. Entre los grupos no se encontraron diferencias estadísticamente significativas para la edad, índice de masa corporal y comorbilidades (hipertensión, diabetes o enfermedad alérgica) ni UAS7. Conclusiones: No encontramos diferencia estadísticamente significativa en el índice de actividad de la urticaria entre ambos grupos. Identificar qué factores permitirían mejorar la calidad de vida de los pacientes.

Keywords: Hypotirodism; Thyroid; Urticaria.

Publication types

  • Comparative Study

MeSH terms

  • Adult
  • Aged
  • Chronic Urticaria / epidemiology*
  • Chronic Urticaria / etiology*
  • Cross-Sectional Studies
  • Female
  • Humans
  • Hypothyroidism / complications*
  • Male
  • Middle Aged