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定义 Low T_3综合征是指T_4分泌大致正常,血内水平也正常,但T_3生成减少而使血内水平处于低状态.若更加重笃,血肉T_4、T_3均降低,就成为Low T_3、Low T_4综合征.这种状态与甲状腺功能无关,系一过性,所以亦有称为non-thyroidal illness(NTI)或enthyroid sicksyndrome.血内游离T_4,虽由于T_4与甲状腺素结合球蛋白结合的阻滞因子增加或稍微增加,但随着T_4降低,最终游离T_4也降低.这种状态无论在临床上(腱反射速度等)还是细胞内是属甲状腺功能减退症,但对中枢性来讲,是甲状腺功能正常状态,血内促甲状腺素不升高,在正常范围.
The definition of Low T_3 syndrome refers to the secretion of T_4 is roughly normal, the blood level is also normal, but the reduction of T_3 makes the blood level in a low state.If it is more important, the flesh and blood T_4, T_3 are reduced to Low T_3 and Low T_4 Syndrome .This condition has nothing to do with thyroid function, the Department of transient, it is also known as non-thyroidal illness (NTI) or enthyroid sicksyndrome. T 2 blood free, although due to T_4 and thyroxin binding globulin block Factor increased or slightly increased, but the final free T_4 also decreased with the decrease of T_ 4.This condition is clinically (tendon reflex speed, etc.) or intracellular hypothyroidism, but in terms of centrality is the thyroid Normal function, blood thyrotropin does not increase in the normal range.