Neutropenia Occurs More Often Under Carbimazole than Under Methimazole Treatment in Pediatric Graves’ Disease Patients

医学 中性粒细胞减少症 卡比咪唑 内科学 胃肠病学 不利影响 甲状腺切除术 中性粒细胞绝对计数 白细胞减少症 儿科 甲状腺 格雷夫斯病 化疗
作者
Vera Schempp,Ayşe Nurcan Cebeci,Christina Reinauer,Joachim Woelfle,Helmuth G. Dörr,Marie-Thérèse Roosen,Jonas Gohlke,Bettina Gohlke
出处
期刊:Thyroid [Mary Ann Liebert, Inc.]
卷期号:34 (6): 735-743
标识
DOI:10.1089/thy.2023.0673
摘要

Background Agranulocytosis is a rare antithyroid drug treatment (ATD) side effect seen in children suffering from Graves' disease (GD). Neutropenia is a recognized adverse event associated with ATD but has also been reported as pre-treatment neutropenia in GD. Methods We performed a retrospective cohort study to analyze the longitudinal clinical and biochemical data of 161 pediatric patients with GD who received either methimazole (MMI) or carbimazole (CBZ) as ATD. The inclusion criteria were elevated free thyroxine (fT4 >25 pmol/L), suppressed thyroid stimulation hormone (TSH <0.05 mlU/ml), and elevated thyroid receptor antibodies (TSHRAb >2.5 IU/l). Absolute neutrophil count (ANC) was used to define neutropenia (ANC <1800/µL) and agranulocytosis (ANC <500/µL). Results Nine of the 161 patients had neutropenia at diagnosis (ANC: 1348/µL ± 250) without further deterioration under ATD. In this subgroup we found higher levels of free triiodothyronine (fT3: 31.45 pmol/l ± 3.99) at diagnosis in comparison to those who developed neutropenia (26.29 pmol/l ± 12.96; p=0.07) and those without neutropenia before and during therapy (23.12 pmol/l ± 13.7; p=0.003). Thirty-eight patients (23.6%) became neutropenic (ANC: 1479/µL ± 262) while receiving ATD. Neutropenia occurred after a mean of 551.8 (range: 10-1376) days, mostly without further deterioration. Two of these 38 patients developed agranulocytosis and underwent emergency thyroidectomy. The neutropenic patients were significantly younger (p=0.031). Neutropenia occurred significantly more often in patients receiving CBZ (50%; n=20/40) than in those receiving MMI (16.5%; n=18/110; p=0.001). The minimum ANC was significantly lower in the CBZ (1971/µL ± 1008) than in the MMI group (2546 ± 959); p= 0.004. Conclusions Neutropenia occurred significantly more often under CBZ than MMI. As this is potentially due to higher immunogenicity, we suggest that children with GD should be treated with MMI. Frequent measurements of ANC may be needed to detect severe agranulocytosis, although low pre-treatment ANC may not necessarily be a contraindication to ATD treatment. Young age may be potentially associated with an increased risk of reduced ANC. Further investigation is necessary to fully understand risk factors for neutropenia in children with GD.
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