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Simon Pearce

Simon Pearce. 5 Thyroid cases. RVI, Endocrine Unit. Unusual Thyroxine Requirement. 39 year old woman Congenital hypothyroidism Required up to 200µcg thyroxine daily in childhood and adolescence High TSH despite high thyroxine dose Date TSH Daily T4 dose 5/01 11.3 200µcg

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Simon Pearce

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  1. Simon Pearce 5 Thyroid cases RVI, Endocrine Unit

  2. Unusual Thyroxine Requirement

  3. 39 year old woman • Congenital hypothyroidism • Required up to 200µcg thyroxine daily in childhood and adolescence • High TSH despite high thyroxine dose • Date TSH Daily T4 dose • 5/01 11.3 200µcg • 8/02 16.0 250µcg • 10/02 13.3 300µcg • 1/03 17.7 400µcg

  4. What to do now?

  5. Talk about compliance • Should involve some mention of LT4 half-life • Explore drug interactions • Ferrous salts • Calcium carbonate (eg. calcichew, rennie) • Gaviscon etc. • PPIs • Cholestryamine etc. • Think about malabsorption (Coeliac Abs)

  6. Actions • Prescribe dosette box • Re-iterate taking thyroxine before breakfast on an empty stomach • Suggest that thyroxine taken at bedtime • Review 8 weeks to recheck TSH • Remember, they’re probably not taking their other medication either

  7. Next steps • Refer • Peak dosage effects (tachy, headache) • Suggest split dose (eg. 50 mcg bd) • Try thyroxine liquid solution • Supervised dosing • Eg. 1000 mcg once per week • Thyroxine absorption test

  8. Palpitations

  9. 79 year old woman • Palpitations • Weight loss • Sinus rhythm • TSH <0.05 (0.3-4.7 mU/l) • FT4 18.0 (9.5-21.5 pmol/l)

  10. 79 year old woman • Palpitations • Weight loss • Sinus rhythm • TSH <0.05 (0.3-4.7 mU/l) • FT4 18.0 (9.5-21.5 pmol/l) • FT3 9.4 (3.5-6.5 pmol/l)

  11. What to do now?

  12. Actions • Prescribe beta blocker • Eg. Propranolol LA 80 mg od or bd • Refer • Indications for urgent referral • Atrial fibrillation • Worsening angina • Heart failure • Consider starting Carbimazole 20mg od or bd • Need to warn about agranulocytosis risk

  13. Next steps • For mild-moderate Graves’ disease • Carbimazole therapy • Block & replace for 12 months • Discuss radioiodine therapy with patient • Permanent hypothyroidism risk (50% or 95%) • Short-term radiation protection measures (11 d) • No cancer risk, no fertility risk, no alopecia • In the case of AF, angina, heart failure: • Warfarin • Early RAI • May cover with carbimazole for 4-6 months post RAI

  14. Oh Baby!

  15. 34 year old woman • On thyroxine for 12 years for hypothyroidism • Period 10 days late • Boots pregnancy test positive • Stopped thyroxine yesterday, worried about effect of drugs on her baby • Second pregnancy; miscarriage at 10 weeks in first pregnancy • Last recorded TSH 6 months ago = 3.9 mU/l

  16. What to do now?

  17. Actions • Check TSH urgently • Recommend increase dose LT4 of 25 mcg/d pending TSH result • Explain fetal thyroid hormone synthesis doesn’t start until 10-12 years • Thyroxine critical for brain development • Thyroxine is the same as natural thyroid hormone

  18. Next steps • Low or suppressed TSH is normal in first trimester • 4 to 8 weekly TFT monitoring throughout pregnancy • Increased thyroxine dose very likely • Refer joint medical obstetric clinic

  19. Lump in my neck

  20. 28 year old F • Sister noticed neck lump last week • No pain • O/e • Anterior triangle neck lump 4x4 cm

  21. What to do now?

  22. Actions • Ask about alarm features: • Airway compromise • Voice change • Check TSH • Refer (endocrine, endocrine surgery, ENT) • We will generally see within 2 weeks • We will see urgently if alarm features

  23. New onset anterior triangle lump Check TSH & refer FNA cytology Management decision If surgery, symptoms etc. then imaging Next steps

  24. I’m tired and emotional

  25. 45 year old woman • Feels tired • Daytime somnolence • Forgetfulness & emotional lability • TSH 6.2 mU/l • Hb 13.5 g/l • RBG 5.9 mmol/l

  26. What to do now?

  27. Actions • Recheck TSH, with FT4 & TPO antibodies • Assess symptoms • If TSH persistently elevated, discuss trial of thyroxine therapy • Close to full replacement dose (75 or 100mcg/d) for 3 or 4 months • Continue if symptoms are improved

  28. Next steps • Symptoms are worse on thyroxine • ? Addison’s disease • ? Hypopituitary • Consider other diagnoses • Depression, mood disturbance, alcohol etc. • Sleep apnoea • Vitamin D deficiency • Iron deficiency • B12 deficiency • Many other possibilities

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