Document Detail

Thyroid volume changes during pregnancy and after delivery in an iodine-sufficient Republic of Slovenia.
MedLine Citation:
PMID:  19406558     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: Literature data concerning thyroid enlargement during pregnancy are not conclusive. Our aim was to systematically follow the thyroid volume changes during pregnancy and after delivery in an iodine-sufficient area. STUDY DESIGN: Prospective study of healthy pregnant women living in an iodine-sufficient area. We followed 118 pregnant women with the mean age 30.9+/-4.1 years in the first trimester (mean 11.2+/-2.5 weeks of pregnancy), in the third trimester (mean 31.6+/-1.7 weeks of pregnancy), and 4 months after delivery (mean 15.9+/-3.9 weeks). Additionally, 71 women were also evaluated 14 months after delivery (mean 13.3+/-1.1 months). All women were negative for thyroid autoantibodies. We measured urinary iodine concentration (UIC), thyroid volume, serum TSH, and body mass index (BMI). After delivery, in a subgroup of women we also estimated the colour flow Doppler sonography (CFDS) patterns 0, I, II and III, where thyroid vascularity increased from pattern 0 to III, and the peak systolic velocity (PSV) using a 7.5 mHz linear transducer. RESULTS: Median UIC in the third trimester (176 microg/g creatinine) was significantly higher than 4 and 14 months after delivery (P=0.030, P<0.001, respectively). Thyroid volume in the third trimester (11.3+/-3.1 mL) was significantly greater (P<0.001) than in the first trimester (8.7+/-2.5 mL), 4 months after delivery (8.6+/-2.5) and 14 months after delivery (7.8+/-2.4 mL). TSH concentration was significantly higher in the third trimester than in the first trimester and 4 months after delivery (P=0.007, P=0.006, respectively). As expected, BMI was the highest in the third trimester. CFDS pattern I was more frequent 4 months after delivery than 14 months after delivery (P<0.001). Similarly, PSV was significantly higher 4 months after delivery than 14 months after delivery (P<0.001). Linear regression analysis revealed TSH and BMI as significant independent predictors for thyroid volume. CONCLUSION: In an iodine-sufficient area, thyroid volume increases during pregnancy and decreases after delivery, and the changes in volume are associated with changes in TSH and BMI. They may be viewed as indicators for metabolic and haemodynamic changes during pregnancy.
Petja Fister; Simona Gaberscek; Katja Zaletel; Blaz Krhin; Ksenija Gersak; Sergej Hojker
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Publication Detail:
Type:  Comparative Study; Journal Article     Date:  2009-04-29
Journal Detail:
Title:  European journal of obstetrics, gynecology, and reproductive biology     Volume:  145     ISSN:  1872-7654     ISO Abbreviation:  Eur. J. Obstet. Gynecol. Reprod. Biol.     Publication Date:  2009 Jul 
Date Detail:
Created Date:  2009-06-29     Completed Date:  2009-10-07     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0375672     Medline TA:  Eur J Obstet Gynecol Reprod Biol     Country:  Ireland    
Other Details:
Languages:  eng     Pagination:  45-8     Citation Subset:  IM    
University Children's Hospital, University Medical Centre Ljubljana, Slovenia.
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MeSH Terms
Body Mass Index
Follow-Up Studies
Iodine* / urine
Linear Models
Organ Size
Postpartum Period / physiology*
Pregnancy / physiology*
Pregnancy Trimester, First / metabolism
Pregnancy Trimester, Third / metabolism
Prospective Studies
Regional Blood Flow
Thyroid Gland / anatomy & histology*,  blood supply
Thyrotropin / blood
Reg. No./Substance:
7553-56-2/Iodine; 9002-71-5/Thyrotropin

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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