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J Rheumatol ; 44(9): 1355-1361, 2017 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-28711878

RESUMO

OBJECTIVE: Our main objective was to assess the relationship between body composition (BC) and response to tumor necrosis factor-α (TNF-α) blocker treatment in patients with ankylosing spondylitis (AS). Our secondary objective was to evaluate the change of BC after treatment, accounting for sex and age. METHODS: All included patients fulfilled the modified New York criteria for AS and were naive to TNF-α blocker. They were followed for at least 6 months after the start of etanercept or adalimumab. The Ankylosing Spondylitis Disease Activity Score containing C-reactive protein (ASDAS-CRP) and the Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) were reported. BC was assessed by whole body dual-energy X-ray absorptiometry. Body fat percentage (BF%), fat mass index (FMI), and fat free mass index (FFMI) were reported as absolute values and as percentiles. RESULTS: Forty-one patients were included (61% men). The median followup was 14.3 months (interquartile range 8.4-19.4). After multivariate regression analysis, more fat at baseline (BF%, FMI, or FMI percentile) was significantly related with a lower chance of achieving a clinically important improvement of the ASDAS-CRP or BASDAI after treatment. The body composition did not change significantly after treatment, but there was a trend toward muscle recovery in men (FFMI change from 34.0th to 37.4th percentile). CONCLUSION: Higher body fat content at baseline was independently associated with a worse response to treatment with TNF-α blockers, measured by ASDAS-CRP and BASDAI change, and might contribute to the lower response rates in female patients. Also, there is a trend toward muscle mass recovery in male patients after treatment.


Assuntos
Adalimumab/uso terapêutico , Adiposidade/fisiologia , Antirreumáticos/uso terapêutico , Etanercepte/uso terapêutico , Espondilite Anquilosante/tratamento farmacológico , Absorciometria de Fóton , Tecido Adiposo/diagnóstico por imagem , Adulto , Proteína C-Reativa , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Espondilite Anquilosante/diagnóstico por imagem , Resultado do Tratamento , Fator de Necrose Tumoral alfa/antagonistas & inibidores
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