Hyperthyroidism
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Hyperthyroidism refers to excessive thyroid hormone production. Graves' disease is the most common cause. Symptoms include tremors, weight loss, palpitations, heat intolerance and eye changes. Diagnosis involves blood tests showing low TSH and high free T4 levels. Treatments include antithyroid drugs, radioactive iodine ablation, or surgery. Untreated hyperthyroidism can lead to thyroid storm, weight loss, osteoporosis, heart and eye complications. Follow-up care after treatment is needed to monitor for hypothyroidism or recurrence.
Hyperthyroidism
- 1. HyperthyroidismHyperthyroidism Julie Joshi, M3 Andrea Fant, M3 Matt Jones, M3 Mohammad Khan, M4 August 9, 2005
- 2. IntroductionIntroduction What is Hyperthyroidism? – “Hyperthyroidism” refers to overactivity of the thyroid gland leading to excessive synthesis of thyroid hormones and accelerated metabolism in the peripheral tissues. The secretion of thyroid hormone is no longer under the regulatory control of the hypothalamic-pituitary center.
- 3. AgendaAgenda We will discuss: – Signs and symptoms – Clinical Statistics – Diagnosis – Treatment – Clinical outcomes of undertreatment and overtreatment – Follow-up care
- 4. Clinical StatisticsClinical Statistics Graves Disease is the most common cause of hyperthyroidism (60-80%) of all cases. Females are affected more frequently than men 10:1.5 Monozygotic twins show 50% concordance rates Incidence peaks from ages 20-40 Incidence is similar in whites and Asians, but is somewhat decreased for African Americans
- 5. Signs and SymptomsSigns and Symptoms – Tremulousness or jitteriness – Exophthalmos – Weight loss despite excellent appetite – hypermetabolic state – Insomnia – Fatigue – Palpitations – Heat intolerance – Sweating – Diarrhea – Deterioration in handwriting – Menstrual irregularities – Muscle weakness/wasting manifested as exercise intolerance or difficulty climbing stairs – Eye symptoms, which may include pain or diplopia – Nervousness – Tachycardia – Goiter – Elevated plasma levels of thyroxin and/or triiodothyronine
- 6. Exopthalamos in Graves Disease Lid Lag in Graves Disease
- 7. How To Diagnose HyperthyroidismHow To Diagnose Hyperthyroidism TSH – expect this to be low Free T4 – expect to be high Nuclear thyroid scintigraphy iodine 123 uptake and scan – expect iodine uptake to increased Anti-thyroperoxidase antibody levels TSH-receptor stimulating autoantibody levels (TSI levels)
- 8. Treatments for HyperthyroidismTreatments for Hyperthyroidism Medical therapy with antithyroid drugs such as propylthiouracil or methimazole Ablation of the thyroid gland with radioactive iodine Subtotal thyroidectomy Self-limited causes of hyperthyroidism, such as subacute thyroiditis, iodine- induced hyperthyroidism, and exogenous administration of T4, can be treated symptomatically. For more significant cardiovascular symptoms, beta-adrenergic blockade with propranolol can be helpful.
- 9. Clinical Outcomes of InadequatelyClinical Outcomes of Inadequately treated Hyperthyroidismtreated Hyperthyroidism Thyrotoxicosis. A life-threatening thyrotoxic crisis (ie, thyroid storm) can occur: fever, tachycardia, neurologic abnormalities, and hypertension, followed by hypotension and shock. It can be Fatal. Thyroid storm occurs in patients who have unrecognized or inadequately treated thyrotoxicosis and a superimposed precipitating event such as thyroid surgery, nonthyroidal surgery, infection, or trauma. Initially the acute mortality rate was nearly 100%. In current practice, with aggressive therapy and early recognition of the syndrome, the mortality rate is approximately 20%. Severe Weight loss with catabolism of bone and muscle. Cardiac complications and psychocognitive complications Osteoporosis in men and women. The effect can be particularly devastating in women, in whom the disease may compound the bone loss secondary to chronic anovulation or menopause. Bone loss is accelerated in patients with hyperthyroidism
- 10. Clinical Outcomes of InadequatelyClinical Outcomes of Inadequately treated Hyperthyroidismtreated Hyperthyroidism Sarcopenia and Myopathy Neonatal hyperthyroidism Apathetic hyperthyroidism - the only presenting features may be unexplained weight loss or cardiac symptoms such as atrial fibrillation and congestive heart failure. Cardiac hypertrophy has been reported in thyrotoxicosis of different etiologies. Severe acropachy can be disabling and can lead to total loss of hand function - clubbing of fingers with osteoarthropathy, including periosteal new bone formation, may occur Ophthalmopathy - compromised vision and blindness. Visual loss due to corneal lesions or optic nerve compression can be seen.
- 11. Follow-up CareFollow-up Care Patients who have been treated for hyperthyroidism need to be followed closely because they may develop HYPOthyroidism or recurrent hyperthyroidism. Follow-up care includes the following: – Reducing medications after 4-6 weeks; the patient should be totally off anti-thyroid medication in 12-18 months – Check thyroid function tests every 4-6 weeks – Monitor closely for remission.