Thyroid Flashcards
Hypothyroidism:
Diagnosed lab testing
- elevated TSH and decreased fT4
Hypothyroidism:
inflammatory
Hashimoto’s Thyroiditis
Can be inflammatory (Hashimoto’s Thyroiditis) or non-inflammatory
Hypothyroidism:
Treatment
Treatment is usually replacement of T4 and potentially replacement of T3
Hypothyroidism:
Pharmaceutical treatment
Pharmaceutical treatment is daily (1/2 life of T4 is 7 days; 80% absorbed)
Take care with dosing in the following patients:
Patients with CHD (need less)
Pregnant women (need more)
Women on HRT (need more)
Hashimoto’s patients (may need less or more)
Treatment Indication – Hypothyroidism #1
Levothyroxine (Levoxyl, Synthroid, Tirosint)
Dosing Adult: 25 – 200mcg po qd
Monitoring: TSH, fT4 every 4-8 weeks
Tip: Dosage should be titrated up every 4-6 weeks; administer on empty stomach 30 min away from food.
Main SE: arrhythmias, hypertension, tachycardia, anxiety, abdominal pain, GI upset, tremor
Hypothyroidism:
Avoid combination with the following drugs:
Levothyroxine
Sodium Iodide, Sucroferric Oxyhydroxide
Hypothyroidism:
Avoid combination with the following supplements:
Levothyroxine
ALA, Chromium, Iron
Treatment Indication – Hypothyroidism #2
Liothyronine (Cytomel, Triostat)
Dosing Adult: 5 – 50mcg po qd
Monitoring: TSH, fT3, total T3 every 4-8 weeks
Tip: Dosage should be titrated up every 4-6 weeks; administer on empty stomach 30 min away from food.
Main SE: arrhythmias, hypertension, tachycardia, anxiety, abdominal pain, GI upset, tremor
Hypothyroidism:
Avoid combination with the following drugs:
Liothyronine
Sodium Iodide, Sucroferric Oxyhydroxide
Hypothyroidism:
Avoid combination with the following supplements:
Liothyronine
Chromium, Iron
Treatment Indication – Hypothyroidism #3
Desiccated Thyroid (Armour, Nature-Throid)
Dosing Adult: ½ - 2 grain po qd (1 grain ~ 60-65mg)
1 grain = 38mcg T4 and 9mcg T3
Monitoring: TSH, fT4, fT3, Total T3 every 4-8 weeks
Tip: Dosage should be titrated up every 4-6 weeks; administer on empty stomach 30 min away from food.
Main SE: arrhythmias, hypertension, tachycardia, anxiety, abdominal pain, GI upset, tremor
Hypothyroidism:
Desiccated Thyroid
Avoid combination with the following drugs:
Sodium Iodide
Hypothyroidism:
Desiccated Thyroid
Avoid combination with the following supplements:
ALA, Chromium, Iron
Hyperthyroidism;
Diagnosed lab testing
decreased TSH and increased fT4, fT3 (total T3)
Hyperthyroidism;
INFLAMMATORY
Can be inflammatory (Graves’ Disease) or non-inflammatory
Lithium causes
Hyperthyroidism;
Treatment depends on???
Treatment depends on cause of hyperthyroidism and can range from a watch and wait approach to thyroid suppression to thyroid ablation/surgery.
Pharmaceutical treatment is used to quickly control hyperthyroid symptoms
Constant monitoring of fT4, fT3 and TSH every 4-6 weeks post treatment is required until stabilization occurs.
Hyperthyroidism;
Treatment Indication #1
Methimazole (Tapazole)–> first line treatment
Dosing Adult: 5 – 20mg po TID; or 5 – 10mg po qd (Graves)
Monitoring: TSH, fT4, fT3, CBC with diff, LFT
Tip: Can give a loading dose initially then lower maintenance dose.
Thioamide – blocks oxidation of iodine in the thyroid gland
Main SE: drowsiness, headache, weight gain, hepatic necrosis (Check liver every 3-6 mo), constipation, nausea, autoimmune reaction.
Hyperthyroidism;
Methimazole
Avoid combination with the following drugs:
BCG, Clozapine, Dipryrone, Sodium iodide.
Hyperthyroidism;
Methimazole
Alcohol?
Avoid combination with alcohol.
Hyperthyroidism;
Methimazole Caution with?…
Caution with iodine supplementation.
Hyperthyroidism;
Treatment Indication #2
Propylthiouracil (PTU)
Dosing Adult: 50 – 150mg po TID
Monitoring: TSH, fT4, fT3, CBC with diff, LFT
Tip: Can give a loading dose initially then lower maintenance dose.
Thioamide – blocks oxidation of iodine in the thyroid gland
Main SE: drowsiness, headache, weight gain, hepatotoxicity (More Toxic), constipation, nausea.
Hyperthyroidism;
Propylthiouracil (PTU)
Avoid combination with the following drugs:
BCG, Clozapine, Dipryrone, Sodium iodide.
Hyperthyroidism;
Propylthiouracil (PTU)
BCG, Clozapine, Dipryrone, Sodium iodide.
Hyperthyroidism;
Propylthiouracil (PTU)
Alcohol??
Avoid combination with alcohol.
Hyperthyroidism;
Propylthiouracil (PTU) Caution with?…
Caution with iodine supplementation.
Hyperthyroidism med side effect
Weight Gain