alexa Protective adaptation of low serum triiodothyronine in patients with chronic renal failure.
Diabetes & Endocrinology

Diabetes & Endocrinology

Journal of Thyroid Disorders & Therapy

Author(s): Lim VS, Flanigan MJ, Zavala DC, Freeman RM

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Abstract Low serum triiodothyronine (T3) concentration is frequently found in patients with chronic renal failure (CRF). To test the hypothesis that this may serve to minimize protein catabolism in these patients, we measured nitrogen balance (Nb) in seven CRF and four control subjects in the basal state and when serum T3 concentration was elevated by L-triiodothyronine (LT3) and suppressed by sodium ipodate administration. In the basal state, both the controls and the CRF patients were in positive Nb, 0.02 +/- 0.51 and 0.58 +/- 0.34 g/day, respectively. During LT3 administration, Nb decreased to -0.80 +/- 0.39 g/day in the CRF patients (P less than 0.01), but remained positive, 0.22 +/- 0.67 g/day, in the controls. There was a significant negative correlation between serum T3 concentration and Nb in the CRF patients (r = -0.63, P less than 0.005), but not in the controls. Furthermore, urea nitrogen generation rate, calculated from urea kinetics, increased from a baseline of 4.6 +/- 0.55 to 6.0 +/- 0.50 mg/min during LT3 administration in the CRF patients (P less than 0.01). Sodium ipodate, which significantly lowered serum T3 concentrations, had little effect on nitrogen metabolism in the controls and the CRF patients. These data support the concept that low serum T3 concentrations may confer a protective effect on CRF patients regarding protein-nitrogen conservation and provide a rationale for not correcting such deficiency.
This article was published in Kidney Int and referenced in Journal of Thyroid Disorders & Therapy

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