Document Detail

Thyroid function and insulin sensitivity before and after bilio-pancreatic diversion.
MedLine Citation:
PMID:  19885706     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Bilio-pancreatic diversion (BPD) induces permanent weight loss in previously severe obese patients through a malabsorptive mechanism. The aim of the study was to evaluate the modifications of circulating thyroid hormones after BPD, a surgical procedure which interferes with the entero-hepatic circulation of biliary metabolites. METHODS: Forty-five patients were studied before and 2 years after BPD. Thyroid-stimulating hormone (TSH), free triiodothyronine (fT3), free thyroxine (fT4), anti-thyroid antibodies, iodine urinary excretion, lipid profile, insulin and glucose plasma levels were assessed. The insulin-resistance HOMA IR index was calculated, and colour Doppler ultrasonography of the neck was performed. RESULTS: The subjects (23%) had subclinical hypothyroidism prior to BPD (TSH levels above the normal range with normal fT3 and fT4 levels). After 2 years 40.42% of the population showed subclinical hypothyroidism, while 6.3% became frankly hypothyroid, all of them with no evidence of auto-immune thyroiditis. Most of the patients, who became sub-clinically hypothyroid only following BPD, had already thyroid alterations at the sonogram (multi-nodular euthyroid goiter and thyroidal cysts) prior to surgery. CONCLUSIONS: BPD increases the prevalence of subclinical or even frank hypothyroidism, without causing a defect in thyroid function itself, through several integrated mechanisms. (1) It induces iodine malabsorption, which is partially compensated by iodine excretion contraction. (2) The entero-hepatic open circulation determines fT3 loss, which induces subclinical or frank hypothyroidism in patients with pre-existing thyroid alterations, interfering also with the weight loss progress. Iodine supplementation should be recommended in those patients reporting thyroid alterations at the sonogram prior to BPD, LT4 therapy should be strictly monitored in patients suffering of subclinical hypopthiroidism and T3 therapy should eventually be considered for patients diagnosed with frank hypothyroidism prior to BPD.
Donatella Gniuli; Laura Leccesi; Caterina Guidone; Amerigo Iaconelli; Chiara Chiellini; Andrea Manto; Marco Castagneto; Giovanni Ghirlanda; Geltrude Mingrone
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Publication Detail:
Type:  Journal Article     Date:  2009-11-03
Journal Detail:
Title:  Obesity surgery     Volume:  20     ISSN:  1708-0428     ISO Abbreviation:  Obes Surg     Publication Date:  2010 Jan 
Date Detail:
Created Date:  2010-01-21     Completed Date:  2010-04-13     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9106714     Medline TA:  Obes Surg     Country:  United States    
Other Details:
Languages:  eng     Pagination:  61-8     Citation Subset:  IM    
Department of Internal Medicine and Diabetes Center, Catholic University, L.go Gemelli 8, 00168 Rome, Italy.
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MeSH Terms
Biliopancreatic Diversion*
Body Composition
Hypothyroidism / etiology,  physiopathology
Insulin Resistance / physiology*
Liver Circulation / physiology
Middle Aged
Obesity, Morbid / physiopathology*,  surgery*
Postoperative Period
Thyroid Gland / physiopathology*,  ultrasonography
Thyrotropin / blood
Thyroxine / blood
Triiodothyronine / blood
Ultrasonography, Doppler, Color
Reg. No./Substance:
6893-02-3/Triiodothyronine; 7488-70-2/Thyroxine; 9002-71-5/Thyrotropin

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