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Higher Prevalence of “Low T3 Syndrome” in Patients With Chronic Fatigue Syndrome: A Case–Control Study

机译:慢性疲劳综合征患者中“低T3综合征”患病率更高:病例对照研究

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Chronic fatigue syndrome (CFS) is a heterogeneous disease with unknown cause(s). CFS symptoms resemble a hypothyroid state, possibly secondary to chronic (low-grade) (metabolic) inflammation. We studied 98 CFS patients (21–69?years, 21 males) and 99 age- and sex-matched controls (19–65?years, 23 males). We measured parameters of thyroid function, (metabolic) inflammation, gut wall integrity and nutrients influencing thyroid function and/or inflammation. Most remarkably, CFS patients exhibited similar thyrotropin, but lower free triiodothyronine (FT3) (difference of medians 0.1%), total thyroxine (TT4) (11.9%), total triiodothyronine (TT3) (12.5%), %TT3 (4.7%), sum activity of deiodinases (14.4%), secretory capacity of the thyroid gland (14.9%), 24-h urinary iodine (27.6%), and higher % reverse T3 (rT3) (13.3%). FT3 below the reference range, consistent with the “low T3 syndrome,” was found in 16/98 CFS patients vs. 7/99 controls (OR 2.56; 95% confidence interval?=?1.00–6.54). Most observations persisted in two sensitivity analyses with more stringent cutoff values for body mass index, high-sensitive C-reactive protein (hsCRP), and WBC. We found possible evidence of (chronic) low-grade metabolic inflammation (ferritin and HDL-C). FT3, TT3, TT4, and rT3 correlated positively with hsCRP in CFS patients and all subjects. TT3 and TT4 were positively related to hsCRP in controls. Low circulating T3 and the apparent shift from T3 to rT3 may reflect more severely depressed tissue T3 levels. The present findings might be in line with recent metabolomic studies pointing at a hypometabolic state. They resemble a mild form of “non-thyroidal illness syndrome” and “low T3 syndrome” experienced by a subgroup of hypothyroid patients receiving T4 monotherapy. Our study needs confirmation and extension by others. If confirmed, trials with, e.g., T3 and iodide supplements might be indicated.
机译:慢性疲劳综合症(CFS)是一种未知原因的异质性疾病。 CFS症状类似于甲状腺功能减退状态,可能继发于慢性(低度)(代谢性)炎症。我们研究了98位CFS患者(21-69岁,男性21位)和99位年龄和性别匹配的对照(19-65岁,23位男性)。我们测量了甲状腺功能,(代谢性)炎症,肠壁完整性和影响甲状腺功能和/或炎症的营养素的参数。最值得注意的是,CFS患者的甲状腺素水平相似,但游离三碘甲状腺素(FT3)较低(中位数差异0.1%),总甲状腺素(TT4)(11.9%),总三碘甲状腺素(TT3)(12.5%),%TT3(4.7%) ,脱碘酶的总活性(14.4%),甲状腺的分泌能力(14.9%),24小时尿碘(27.6%)和较高的反向T3(rT3)%(13.3%)。在16/98 CFS患者与7/99对照中发现FT3低于参考范围,与“低T3综合征”相符(OR 2.56; 95%置信区间= 1.00-6.54)。大多数观察结果坚持两项敏感性分析,其中体重指数,高敏感性C反应蛋白(hsCRP)和WBC的临界值更高。我们发现了(慢性)低度代谢性炎症(铁蛋白和HDL-C)的可能证据。在CFS患者和所有受试者中,FT3,TT3,TT4和rT3与hsCRP呈正相关。 TT3和TT4与对照组的hsCRP呈正相关。低循环T3和从T3到rT3的表观转变可能反映出组织T3水平更严重下降。目前的发现可能与最近的代谢组学研究指出代谢不足状态相符。它们类似于接受T4单一疗法的一组甲状腺功能减退患者经历的轻度形式的“非甲状腺疾病综合征”和“低T3综合征”。我们的研究需要其他人的确认和扩展。如果得到证实,则可能需要进行T3和碘化物补充剂的试验。

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