A 34-year-old woman is brought to the emergency department by her husband due to severe agitation, palpitations, and confusion. She has a history of Graves disease but stopped taking her medications three months ago. Her temperature is (), blood pressure is , pulse is and irregular, and respirations are . Physical examination reveals a diaphoretic, delirious patient with a fine tremor, lid lag, and a diffusely enlarged, non-tender thyroid gland. An electrocardiogram shows atrial fibrillation with rapid ventricular response. Arrange the following pharmacologic interventions in the required chronological sequence for the acute management of this patient's condition to prevent exacerbation of her thyrotoxic state.
- 1Intravenous propranolol
- 2Oral propylthiouracil
- 3Saturated solution of potassium iodide
Cevap
The correct sequence of administration is intravenous propranolol, followed by oral propylthiouracil, and finally a saturated solution of potassium iodide.
The management of thyroid storm requires a strict and specific sequence of pharmacologic interventions. The initial priority is controlling the life-threatening peripheral effects of thyroid hormone (the adrenergic surge) using a beta-blocker such as propranolol, which also helps decrease the peripheral conversion of T4 to T3. Next, the synthesis of new thyroid hormone must be blocked using a thionamide, such as propylthiouracil (PTU). Finally, the release of preformed hormone from the thyroid gland is inhibited using an iodine solution (e.g., potassium iodide). It is critical that the iodine solution is administered at least one hour after the thionamide. If this sequence is violated, the exogenous iodine will be used by the hyperactive gland as a substrate to synthesize more thyroid hormone, drastically worsening the patient's condition.
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Anahtar Kavram
In the management of thyroid storm, thionamides (e.g., propylthiouracil) must be administered prior to iodine solutions to prevent the exogenous iodine from being utilized as a substrate for a massive surge in new thyroid hormone synthesis.