L-T4

AcronymDefinition
L-T43,5,3,5-Tetraiodo-L-Thyronine
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References in periodicals archive ?
Smallridge, M.D., from the Mayo Clinic in Jacksonville, Florida, and colleagues conducted a retrospective analysis to examine whether L-T4 preparation (generic versus brand) affected hospitalization for cardiovascular events.
At 32 weeks, a new US presented a goiter with 35x18x23mm, and first L-T4 amnioinfusion (300 [micro]g-180 [micro]g/kg estimated fetal weight) was performed with concomitant amniotic fluid withdrawal showing increased levels of thyroid-stimulating hormone (TSH) (3,53 [micro]IU/mL, Normal Range (NR): 0,04-0,51 [micro]IU/mL) and normal levels of free thyroxine (fT4) (0.3 ng/dL, NR: 0,10-0,77 ng/dL).
It is also not fully clear the effect of levothyroxine (L-T4) treatment on left ventricular function and these factors.
As weight gain is commonly reported to be associated with primary hypothyroidism, patients would be expected to lose weight following treatment with L-T4. However, the lack of weight loss on treatment has negated this popular belief (Hoogwerf and Nuttall, 1984; Lee and collaborators, 2014).
The criteria for a diagnosis of permanent CH were: 1- absent or ectopic thyroid on imaging; or 2- an increase in medication dosage over time or elevated TSH due to non-compliance to treatment; or 3- elevated TSH (>10 [micro]U/mL) after a 30-day trial off L-T4 therapy at age [greater than or equal to]3 years (12,22,23).
The L-T4 dose was reduced to 50 [micro]g/day and TFT results were maintained within reference intervals.
TSH lowering effect of metformin in type 2 diabetic patients: differences between euthyroid, untreated hypothyroid, and euthyroid on L-T4 therapy patients.
Inclusion criteria of ISTSH were appropriate doses of L-T4, improvement of clinical findings, normalization of serum total T4 levels and persistently high TSH concentrations.
A statement released by the Endocrine Society after the FDA announcement was made says that the FDA's recent efforts are "a reasonable step to ensuring the safety of patients taking L-T4 [levothyroxine sodium]," but urged the agency to do more.
It requires a daily dose of prescription synthetic T4, called levothyroxine sodium (L-thyroxine, L-T4).