null甲状腺功能减退
Hypothyroidism甲状腺功能减退
Hypothyroidism复旦大学医学院内分泌科
李 益 明Hypothalamic-pituitary-thyroid axisHypothalamic-pituitary-thyroid axisnullOverviewOverviewClinical syndrome
Slowing down of metabolism
Slowing of growth and mental retardation in infants and children
Generalized slowing down of organism
Deposition of glycosaminoglycans in skin and muscle
Reversible with therapyEtiology and ClassifcationEtiology and ClassifcationPrimary(thyroid failure)
Hashimoto’s thyroiditis
Iodide deficiency or excessive
Radioactive iodine therapy for GD
Subtotal thyroidectomy
Subacute thyroiditis
Secondary: pituitary deficit
Tertiary: hypothalamic dysfunction
Peripheral resistance to thyroid hormonePathogenesisPathogenesisAffects each tissue
Accumulation of glycosaminoglycans (hyaluronic acid)
Not to excessive synthesis
But decreased destrution
Increased capillary permeability
Interstitial edema
Skin
Heart muscle
Striated muscleClinical FeaturesClinical FeaturesAdultsAdultsSymptoms
Easy fatigability
Coldness
Weight gain
Constipation
Menstrual irregularities
Signs
Cool, rough, dry skin
Puffy face and hands
Hoarse and husky voice
Slow reflexes
Yellowish color skinClinical FeaturesClinical FeaturesCardiovascular signs
Impaired myocardium contraction
Bradycardia
Diminished cardiac output
ECG: low voltage of QRS, P, T waves
Pericardial effusion
Coronary artery disease
Cardiac angina(Replacement therapy aggravate )
Clinical FeaturesClinical FeaturesPulmonary function
Shallow, slow respiration
Respiratory failure
Intestinal peristalsis
Markedly slowed
Constipation
Renal function
Decreased glomerular filtrationClinical FeaturesClinical FeaturesAnemia
Impaired hemoglobin synthesis
Menorrhagia and Absorption of iron
Folate deficiency
Pernicious anemia
Nuromuscular system
Muscle weakness
Slow reflexes
Central nervous system symptoms
Inability to concentrate
Anovulatory cycles and infertility
DepressedSymptoms of hypothyroidismSymptoms of hypothyroidism Symptoms % of cases
Weakness 99
Dry skin 97
Coarse skin 97
Lethargy 91
Slow speech 91
Edema of eyelids 90
Sensation of cold 89
Decreaseed sweeting 89
Cold skin 83
Thick tongue 82
Edema of face 79
Coarseness of hair 76
Pallor of skin 67
Memory impairment 66
Symptomsof hypothyroidismSymptomsof hypothyroidism Symptoms % of cases
Constipation 61
Gain in weight 59
Loss of hair 57
Pallor of lips 57
Dyspnea 55
Peripheral edema 55
Hoarseness or aphonia 52
Anorexia 45
Nervousness 35
Menorrhagia 32
Palpitation 31
Deafness 30
Precordial pain 25
Myxedema comaMyxedema comaFrequently in obese elderly woman
Yellowish skin
Large tongue
Thin hair
Bradycardia
Marked hypothermia
Lethargy progressing to stupor or coma
Hypoventilation
Hypotension
ShockCretinismCretinismEtiology
Low iodide intake and endemic goiter
Ectopic thyroid gland
TSH-R Ab[block] from mother
Inherited defects in thyroid hormone
Iodide,antithyroid drugs,radioactive iodine
Symptoms
Respiratory difficulty
Cyanosis
Jaundice
Poor feedingHypothroidism in childenHypothroidism in childen
Retarded growth
Mental retardation
Precocious pubertyFace of hypothyroidismFace of hypothyroidismFace of hypothyroidismFace of hypothyroidismLaboratory FindingsLaboratory FindingsFT4:
uTSH:
sensitive to detect 0.01u/mL
Most sensitive
Most convenient
Most specific
FT3:
Variable
May be within the normal range
TPOAb、TgAb: AITD (autoimmune thyroid disease)
TCDiagnosisDiagnosisSymptoms+SignsPrimary
hypothyroidismTRH testFT4 +TSH Secondary
hypothyroidismNormal type
responseExcessive
responseNo
responsePituitary
lesionHypothalamic
lesionFT4 +TSH or NPrimary
hypothyroidismIf ?TreatmentTreatmentDrugs for hypothyroidismDrugs for hypothyroidism LT4 Desiccated thyroid
Component T4 T4+T3
high ratio of T3 to T4
Dose 50g 40mg
Intensity 50 g = 30mg
Initial dosage 25~50 g 20mg
Maintenaning dosage 50~150 g 40~120mg
Half-life 7 days 1 days Institution of replacement therapyInstitution of replacement therapyFull adrenal support first if with concomitant adrenal insufficiency
Beginning with low dosage
Degress of hypothyroidism
Age
General health
Increase ½ tablet weekly
Needs 6 weeks before equilibration
Use powdered thyroid gland for myxedema coma
Monitoring FT4 and TSH
TSH will be suppressed in normal range in 3 moSide effectsSide effectsNo allergy
Overdosage
Arrhythmia
Paroxyamal atrial tachycardia
fibrillation
Insomnia
Tremor
Restleness
Excessive warmthnull
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