**Question:** The Following drug is used in management of thyroid storm during pregnancy:

A. Propantheline bromide
B. Thiamazole
C. Thyroxine
D. Hydrocortisone

**Core Concept:** Thyroid storm is a life-threatening emergency characterized by a severe exacerbation of thyrotoxicosis, which may lead to multiorgan failure and death. It is particularly dangerous in pregnant patients due to the unique physiological changes that occur during pregnancy, which may further exacerbate the condition.

**Why the Correct Answer is Right:**

Thiamazole (methimazole), an antithyroid drug, is the appropriate choice for managing thyroid storm in pregnant patients. Thiamazole works by inhibiting thyroid hormone synthesis, reducing thyroid hormone release, and decreasing thyroid hormone activity. This helps to control hyperthyroidism and its associated symptoms, thereby stabilizing the patient.

**Why Each Wrong Option is Incorrect:**

A) Propantheline bromide is a muscarinic antagonist used to treat gastrointestinal disorders, not thyroid disorders. It does not address the underlying issue of hyperthyroidism and is thus not suitable for managing thyroid storm.

B) Hydrocortisone is a glucocorticoid used for anti-inflammatory and immunosuppressive purposes. It does not address the thyroid hormone dysregulation and is not a suitable treatment for thyroid storm.

C) Thyroxine (levothyroxine) is a thyroid hormone used to treat hypothyroidism, not hyperthyroidism. Its use in managing thyroid storm would worsen the condition by exacerbating hyperthyroidism and its associated symptoms.

**Clinical Pearl:**

In the management of thyroid storm in pregnant patients, a timely diagnosis and appropriate treatment are essential to prevent maternal and fetal complications. Thiamazole is the primary choice for controlling hyperthyroidism, while supportive care and close monitoring are crucial alongside. In certain cases, intravenous thiamazole (MMI) may be administered parenterally to ensure rapid therapeutic effect.