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Iodine
Deficiency
disorders of
Thyroid gland
Made by
KARANDEEP
GROUP 418
IODINE
IODINE
Functions
IDD OF THYROID
GLAND - GOITER
• Goiter is the most obvious
manifestation of iodine deficiency.
• Low iodine intake leads to
reduced thyroxine (T4),
triiodothyronine (T3), which
results in an attempt to restore
T4 and T3 production to
normal.
IDD OF THYROID
GLAND - GOITER
WHO classification of
goiter
WHO classification of
goiter
• palpable but not visible when the
neck is in the normal position,
WHO classification of
goiter
• clearly visible when the neck is in
a normal position and is
consistent with an enlarged
thyroid when the neck is
palpated
Epidemiology
of Endemic goiter
shows a young girl with
a soft diffuse goitre
IDD of the thyroid gland:
cretinism
IDD of the thyroid
gland: cretinism
The appearance of
cretinism sufferers
IDD of the thyroid
gland: diagnosis
IDD of the thyroid
gland: diagnosis
IDD of the thyroid gland:
diagnosis
• For the standardized 24-
hour test, a 50 mg iodine
load is given first, and
90% of this load is
expected to be recovered
in the urine of the
following 24 hours
IDD of the thyroid
gland: diagnosis
• Recovery of less than 90% is
taken to mean high retention,
that is, iodine deficiency
• The recovery may however be
well less than 90% during
pregnancy, and an intake of
goitrogens can alter the test
results •
NOTE
• Goitrogens are substances
that disrupt the
production of thyroid
hormones by interfering
with iodine uptake in the
thyroid gland.
IDD of the thyroid
gland: diagnosis
• In regions of iodine deficiency,
the frequency of supranormal
TSH concentrations (>5mU/L) in
blood spots collected as part of
neonatal screening programs is
higher than in iodine sufficient
areas and roughly correlates with
the severity of iodine deficiency
PREVENTION AND
TREATMENT
• Iodine supplementation
in areas deprived of
iodine rich food is
viewed as the most cost
effective solution to
address the problem of
IDD •
PREVENTION AND
TREATMENT
• Iodine deficiency can be
corrected by adding
iodine to dietary media
like salt, oil, water,
sauces etc.
PREVENTION AND
TREATMENT
• The World Health Organization
(WHO) recommends 90
micrograms of iodine daily for
infants and children up to five
years, 120 micrograms for
children 6 to 12 years, 150
micrograms daily for children
≥12 years and adults, and 250
mcg daily during pregnancy and
lactation
PREVENTION AND
TREATMENT
• Too high iodine intake (over
dosage of iodine supplements)
can have toxic side effects –
It can lead to
hyperthyroidism and
consequently high blood levels
of thyroid hormones
Reference

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Iodine deficiency disorders of thyroid gland

  • 5. IDD OF THYROID GLAND - GOITER • Goiter is the most obvious manifestation of iodine deficiency. • Low iodine intake leads to reduced thyroxine (T4), triiodothyronine (T3), which results in an attempt to restore T4 and T3 production to normal.
  • 8. WHO classification of goiter • palpable but not visible when the neck is in the normal position,
  • 9. WHO classification of goiter • clearly visible when the neck is in a normal position and is consistent with an enlarged thyroid when the neck is palpated
  • 11. shows a young girl with a soft diffuse goitre
  • 12.
  • 13. IDD of the thyroid gland: cretinism
  • 14. IDD of the thyroid gland: cretinism
  • 16. IDD of the thyroid gland: diagnosis
  • 17. IDD of the thyroid gland: diagnosis
  • 18. IDD of the thyroid gland: diagnosis • For the standardized 24- hour test, a 50 mg iodine load is given first, and 90% of this load is expected to be recovered in the urine of the following 24 hours
  • 19. IDD of the thyroid gland: diagnosis • Recovery of less than 90% is taken to mean high retention, that is, iodine deficiency • The recovery may however be well less than 90% during pregnancy, and an intake of goitrogens can alter the test results •
  • 20. NOTE • Goitrogens are substances that disrupt the production of thyroid hormones by interfering with iodine uptake in the thyroid gland.
  • 21. IDD of the thyroid gland: diagnosis • In regions of iodine deficiency, the frequency of supranormal TSH concentrations (>5mU/L) in blood spots collected as part of neonatal screening programs is higher than in iodine sufficient areas and roughly correlates with the severity of iodine deficiency
  • 22. PREVENTION AND TREATMENT • Iodine supplementation in areas deprived of iodine rich food is viewed as the most cost effective solution to address the problem of IDD •
  • 23. PREVENTION AND TREATMENT • Iodine deficiency can be corrected by adding iodine to dietary media like salt, oil, water, sauces etc.
  • 24. PREVENTION AND TREATMENT • The World Health Organization (WHO) recommends 90 micrograms of iodine daily for infants and children up to five years, 120 micrograms for children 6 to 12 years, 150 micrograms daily for children ≥12 years and adults, and 250 mcg daily during pregnancy and lactation
  • 25. PREVENTION AND TREATMENT • Too high iodine intake (over dosage of iodine supplements) can have toxic side effects – It can lead to hyperthyroidism and consequently high blood levels of thyroid hormones
  • 26.