The durometry in the assessment of psoriasis plate, an exploratory study
DOI:
https://doi.org/10.29176/2590843X.426Keywords:
Psoriasis, plaque, induration, hardnessAbstract
Background: Psoriasis biomechanically exhibits changes in the hardness of the skin; there are no markers to measure their activity and their follow-up is based on clinimetry. One of the deficiencies of the PASI is the interdependence between its variables and the controversy when defining the "induration" of the plate, either from its height or from semiology. The durometer, an apparatus that measures the hardness of materials, was tested for the first time to measure this characteristic.
Methods: Two evaluators (E1 and E2) with a factory calibrated durometer, measured in hardness units both plaques and "healthy" skin control. The analysis was performed using Student's t-test and ANOVA for paired groups with repeated measures, Pearson's correlation coefficient (r), Fisher's variance (F) and correlation and agreement using linear regression and Kappa index.
Results and conclusions: Thirty-three plaques were obtained from 13 patients with average PASI of 11. E1 and E2 obtained r=0.37 and 0.22 between the durometry vs. IndPASI. An F>20 between plates vs. healthy skin; Inter-rater an r=0.95, and a kappa index of 0.88 with 95%CI and p<0.05. Durometry does not correlate with PASI. However, a recalibration in its function is feasible, requiring more studies with a larger sample, analyzing the effects of the therapeutic scheme over time. The durometry is useful in the assessment of the hardness of the psoriasis plaque, with adequate correlation and inter-rater agreement.
Author Biographies
Jhonatan Quintero
Médico cirujano, residente de tercer año de Dermatología, Universidad de Caldas, Manizales, Colombia
Felipe Jaramillo-Ayerbe
Médico cirujano, dermatólogo, dermatopatólogo; jefe, Programa de Dermatología, Universidad de Caldas, Manizales, Colombia
Ana María Hoyos
Médica cirujana, dermatóloga, Universidad de Caldas, docente, Programa de Dermatología, Universidad de Caldas, Manizales, Colombia
José Arnoby Chacón
Médico, MSP; profesor, Universidad de Caldas, Manizales, Colombia
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