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Zorluk: OrtaEndocrinology and Metabolism

A 34-year-old woman is brought to the emergency department by her husband due to severe agitation, confusion, and high fever. She has a history of Graves disease but stopped taking her prescribed antithyroid medications 3 months ago. Her temperature is 39.8°C (103.6°F), blood pressure is 160/90 mmHg, pulse is 145/min and irregular, and respiratory rate is 24/min. Physical examination reveals an enlarged, non-tender goiter, marked fine resting tremor, and profound diaphoresis. An electrocardiogram demonstrates atrial fibrillation with a rapid ventricular response. A diagnosis of thyroid storm is made. Supportive measures, including cooling blankets and intravenous fluids, are initiated.

Arrange the following targeted therapies in the correct chronological sequence for the optimal management of this patient's condition, from first intervention to final definitive treatment.

  1. 1Intravenous propranolol
  2. 2Oral propylthiouracil (PTU)
  3. 3Saturated solution of potassium iodide (SSKI)
  4. 4Radioactive iodine therapy

Cevap

The correct sequence of management for thyroid storm is: Intravenous propranolol, followed by Oral propylthiouracil (PTU), followed by Saturated solution of potassium iodide (SSKI), and finally Radioactive iodine therapy after the acute crisis has resolved.
The acute pharmacological management of thyroid storm strictly follows a stepwise approach to prevent the exacerbation of symptoms. Beta-blockers (propranolol) are given first to immediately mitigate severe adrenergic manifestations like tachycardia and agitation, while also inhibiting peripheral T4-to-T3 conversion. A thionamide (PTU) is given next to halt the synthesis of new thyroid hormone. Iodine (SSKI) is given only after the thionamide has taken effect (typically 1 hour later) to block the release of preformed hormone; administering iodine prematurely can fuel further hormone synthesis. Finally, definitive treatment such as radioactive iodine therapy is delayed until the acute crisis has fully resolved and the patient is euthyroid.

Adım Adım Çözüm

1
Administer an intravenous beta-blocker (propranolol).
Immediate reduction in adrenergic tone and slowed heart rate.
Controls life-threatening cardiovascular symptoms and decreases peripheral conversion of T4 to T3.
2
Administer a thionamide (propylthiouracil or methimazole).
Inhibition of thyroid peroxidase.
Blocks the synthesis of new thyroid hormone.
3
Administer an iodine solution (SSKI) at least 1 hour after the thionamide.
Inhibition of thyroid hormone release.
Blocks the release of preformed hormone without providing raw material for the unblocked gland to synthesize more.
4
Schedule definitive radioactive iodine ablation or surgery.
Permanent treatment of Graves disease.
Prevents future episodes of thyrotoxicosis once the patient is medically stabilized and euthyroid.

Anahtar Kavram

Chronological pharmacological management of thyroid storm
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Konular

Endocrinology and Metabolism

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