Effects of N-acetylcysteine on Low T3 Syndrome

Study Overview
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Brief Summary
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The propose of this study is to determine whether N-acetylcysteine is effective in reversing the changes in thyroid hormones seen in critical illness, known as the low T3 syndrome.

Detailed Description
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The low T3 syndrome or nonthyroidal illness is characterized by low levels of T3, normal or high normal levels of rT3, low or normal levels of T4 and inappropriately normal or low levels of TSH. These changes affect up to 75% of patients and have prognostic implications. Interleukin-6 (IL6) seems to have a causative role in the pathogenesis of nonthyroidal illness. There is evidence that the reduction in serum T3 was inversely associated with serum IL-6, while the rT3 have a positive association. The mechanism of action of cytokines on the metabolism of thyroid hormones has not been determined and the potential role of cytokines on the deiodases has been the focus of research. In a cell culture model study, IL-6 was able to suppress the conversion of T4 to T3 by deiodases type 1 and 2 and stimulate the inactivation of T3 by deiodase type 3, a situation similar to nonthyroidal illness. The use of N-acetylcysteine prevented this alterations, been consistent with the hypothesis that IL6 inhibits the function of the deiodases by increasing the oxygen reactive species and by consuming gluthathione or some gluthathione dependent cofactor. Considering the absence of human studies evaluating the use of N-acetylcysteine in nonthyroidal illness, the aim of this study is to investigate whether NAC has in vivo effect on changes of thyroid hormones.

Official Title
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Evaluation of the Effects of N-acetylcysteine on Thyroid Hormone Levels in the Low T3 Syndrome

Conditions
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Acute Myocardial Infarction, Euthyroid Sick Syndrome, Ischemic Heart Disease

Intervention / Treatment
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* Drug: N-acetylcysteine


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: diagnosis of acute myocardial infarction with less than 12 hours of evolution reperfusion therapy (primary angioplasty) Exclusion Criteria: Thyroid disease Chronic renal disease with renal replacement therapy hepatic insufficiency immunosuppression

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 80 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: n-acetylcysteine<br>intra-venous infusion of 1200 mg of n-acetylcysteine twice a day for 48 hours. | Drug: N-acetylcysteine<br>* in infusion of 1200 mg of n-acetylcysteine twice a day for 48 hours<br>* Other names: acetylcysteine;|
| No Intervention: no intervention<br>No intervention | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Serum T3 Levels at 48 Hours |  | 48 hours | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Euthyroid Sick Syndrome, low T3 syndrome, deiodases, oxidative stress, ischemic heart disease