Thyroid Dysfunction Flashcards

1
Q

what is a goitre

A

enlargement of the thyroid gland when it is over stimulated

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2
Q

what is hypothyroidism

A

when the thyroid gland is not producing enough of the thyroid hormones

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3
Q

what are symptoms of hypothyroidism

A

obesity, bradycardia, hoarse voice, slow reflexes, tiredness, cold intolerance, menorrhagia, puffy face/hands/feet, loss of outer 1/3 eyebrow, non pitting oedema

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4
Q

what happens to the TSH levels in hypothyroidism

A

they increase

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5
Q

what causes hypothyroidism

A
TSH/TRH deficiency 
inadequate iodine 
autoimmunity 
congenital 
surgical removal of thyroid gland
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6
Q

what condition is seen in children with hypothyroidism and what are the features of this

A

cretinism - dwarfed statue, mental deficiency, poor bone development, slow pulse, muscle weakness

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7
Q

what condition is seen in adults with hypothyroidism and what are the features of this

A

myxedema - thick puffy skin, muscle weakness, slow speech, mental deterioration, intolerance to cold

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8
Q

what is the autoimmune disease causing hypothyroidism and what are the treatments

A

Hashimoto’s disease

treatment = oral thyroid hormone

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9
Q

what is the autoimmune disease causing hyperthyroidism

A

Graves’ disease

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10
Q

what causes hyperthyroidism

A
  • autoimmune
  • toxic multinodular goitre
  • drugs
  • thyroid carcinoma
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11
Q

what are the symptoms of hyperthyroidism

A

weight loss, heat intolerance, tachycardia, weakness, increased appetite, hyper reflexive, amenorrhea, tiredness, warm sweaty hands, bounding pulse, lid lag, staring eyes

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12
Q

how does Graves’ disease work

A

causes the production of thyroid stimulating immunoglobulin which stimulates thyroid hormone secretion

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13
Q

what happens to the TSH levels in hyperthyroidism

A

decrease

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14
Q

what radioisotope is used to scan the thyroid gland

A

technetium 99

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15
Q

what drug is used to treat overactive thyroid

A

carbimazole

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16
Q

what does carbimazole do

A

its a pro drug which is converted into methimazole in the body which prevents thyroid peroxidase from coupling the iodinating tyrosines on the thyroglobulin

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17
Q

what is lingual thyroid

A

where part of the thyroid gland stays on the tongue as it didn’t migrate down during development

18
Q

why does a thyroglossal duct cyst form

A

when not all of the thyroglossal duct disappears during development

19
Q

where are thyroglossal duct cysts found

A

on the anterior part of the neck in the midline

20
Q

what causes the thyroglossal cyst to move upwards

A

tongue protrusion

21
Q

what is an adenoma

A

benign tumour of the glandular epithelia tissue

22
Q

what causes the majority of thyroid diseases

A

primary abnormality of the thyroid gland itself

23
Q

why is there such a wide range for normal thyroid hormone levels

A

the hypothalamus is constantly responding to the changes in the environment

24
Q

what 3 classifications of goitres are there

A
  • diffuse (affecting the whole thyroid)
  • multinodular
  • single nodule
25
in which gender are goitres more prevalent in
females
26
what is a physiological goitre
swelling of the thyroid gland however there is still normal thyroid function
27
what is the most common cause globally of goitre
iodine deficiency - the reduced thyroxine levels leads to increased TSH leading to thyroid enlargement (usually nodular)
28
in which areas is iodine deficiency seen
mountainous areas (as theres iodine in the sea)
29
what is the most common cause of goitre in the uk
Multinodular goitre where the cause is unknown. It may cause hyperthyroidism making it a toxic multinodular goitre
30
what happens to the child if the mother is iodine deficient in pregnancy
the child may develop mental retardation, abnormal gait, short statue, goitre and hypothyrodism
31
what is a retrosternal multinodular goitre
where a multinodular goitre enlarges inferiorly compressing the trachea
32
what is thyrotoxicosis
excessive amount of thyroid hormones
33
what is lid lag
delay of moving the eyelid down as the eye moves down
34
what is staring eye
when the levator palpebrae superioris muscle is constantly stimulated due to the increased sympathetic stimulation
35
what causes hyperthyroidism
- autoimmune - toxic multinodular goitre - toxic adenoma
36
what is seen in graves disease
Exopthalmos (bulging of the eyes) | Pre-tibial myxoedema
37
what is myxoedema
non pitting oedema due to depositions of mucopolysaccharides
38
how does a toxic adenoma cause hyperthyroidism
the adenoma can independently produce thyroxine
39
what are the treatments for hyperthyroidism
- carbimazole - thyroidectomy - radioactive iodine
40
true or false: thyroid cancers cause hypothyroidism
false - they do not cause either hypo or hyper
41
what 3 causes of goitres have no metabolic affects
- thyroid cancer - iodine deficiency - multinodular goitre
42
what 4 causes of a goitre also cause metabolic dysfunction
- graves - hashimotos - toxic adenoma - toxic multinodular goitre