Beneficial effects of iodized salt prophylaxis on thyroid volume in an iodine deficient area of southern Italy.
OBJECTIVE
Goitre prevalence in school-age children is an indicator of the severity of iodine deficiency disorders (IDD) in an endemic area. The aims of the present study were (i) to provide ultrasound thyroid volume (TV) reference values in a healthy population of school-children aged 11-14 year living in iodine-sufficient areas of Calabria region (ii) to assess both goitre prevalence and urinary iodine (UI) concentration in all children aged 11-14 year from four mildly iodine-deficient areas in which we have carried out a program of salt iodization and (iii) to evaluate the efficacy of the iodoprophylaxis in an adult population living in a small village of the same endemic area.


METHODS
Cross-sectional and prospective studies.


METHODS
TV was assessed by ultrasonography and iodine intake was estimated by measuring iodine excretion in spot urine samples. Results We provided the ultrasound normal reference values as a function of age and body surface area, which displayed significant differences from those recommended by the World Health Organization. By adopting local criteria, the prevalence of goitre in children ranged from 23.4% to 27.7% normalized for age and body surface area, respectively, while the UI excretion was < 100 microg/l in 38% of subjects studied. In an adult population living in the same endemic area, goitre prevalence was lowest in the 18-27-year-old age group, and increased progressively with age.


CONCLUSIONS
We propose for the first time local reference ultrasound values for TV in a population of 11-14-year-old school-children that should be used for monitoring IDDs and have demonstrated the beneficial effects of iodoprophylaxis in consistent with reduced goitre prevalence in children and in the young adult population studied.
Bonofiglio
Daniela
D
Department of Pharmaco-Biology, University of Calabria, 87030 Arcavacata di Rende, CS, Italy.
Catalano
Stefania
S
Perri
Anna
A
Baldini
Maria Pia
MP
Marsico
Stefania
S
Tagarelli
Andrea
A
Conforti
Domenico
D
Guido
Rosita
R
Andò
Sebastiano
S
D000293:Adolescent; D000328:Adult; D002648:Child; D003430:Cross-Sectional Studies; D005260:Female; D006042:Goiter / Q000000981:diagnostic imaging / Q000188:drug therapy / Q000453:epidemiology / Q000517:prevention & control*; D006801:Humans; D007455:Iodine / Q000008:administration & dosage / Q000652:urine*; D007558:Italy / Q000453:epidemiology; D008297:Male; D015995:Prevalence; D011446:Prospective Studies; D017673:Sodium Chloride, Dietary / Q000008:administration & dosage*; D013961:Thyroid Gland / Q000000981:diagnostic imaging*; D014463:Ultrasonography
D017673:Sodium Chloride, Dietary; C034024:iodized salt; D007455:Iodine