A 28-year-old woman with a history of Hashimoto's thyroiditis presents with acute severe thyroid pain, fever, and a tender thyroid nodule. Thyroid function tests show TSH 0.2 mIU/L and free T4 8.5 ng/dL (normal 0.8–1.8). Thyroid ultrasound shows a hypoechoic nodule with increased vascularity. What is the drug of choice for managing the acute inflammatory phase?

Explanation

## Clinical Context: Acute Thyroiditis Superimposed on Chronic Hashimoto's Thyroiditis This patient has: - Chronic autoimmune thyroiditis (Hashimoto's history) - Acute exacerbation with severe pain and systemic symptoms - Thyrotoxic phase (low TSH, elevated T4) due to thyroid hormone release from inflammation - Imaging evidence of acute inflammation (hypoechoic nodule, increased vascularity) ## Drug of Choice: Corticosteroids (Prednisolone) **Key Point:** When acute thyroiditis is severe, refractory to NSAIDs, or occurs in the setting of chronic autoimmune thyroiditis, corticosteroids are the preferred anti-inflammatory agent. **High-Yield:** Corticosteroid Use in Thyroiditis: | Indication | Dose | Duration | Notes | |-----------|------|----------|-------| | Acute severe thyroiditis (refractory to NSAIDs) | Prednisolone 20–40 mg/day | 1–2 weeks, then taper | Rapid anti-inflammatory effect | | Chronic autoimmune thyroiditis with acute flare | Prednisolone 20–30 mg/day | 2–4 weeks, then taper | Prevents recurrent exacerbations | | Riedel's thyroiditis | Prednisolone 40–60 mg/day | Prolonged (months) | Prevents fibrosis progression | **Clinical Pearl:** In this case, corticosteroids are preferred over NSAIDs because: 1. The patient has chronic autoimmune thyroiditis (higher risk of severe flares) 2. Acute symptoms are severe (fever, pain, systemic symptoms) 3. Corticosteroids suppress both acute inflammation AND chronic autoimmune response 4. They prevent recurrent exacerbations in autoimmune thyroiditis **Mnemonic:** **SCAR** = **S**evere thyroiditis, **C**hronic autoimmune background, **A**cute flare, **R**equires corticosteroids. ## Treatment Algorithm for Thyroiditis by Severity ```mermaid flowchart TD A[Acute Thyroiditis]:::outcome --> B{Severity?}:::decision B -->|Mild-moderate| C[NSAIDs first-line]:::action B -->|Severe OR refractory to NSAIDs| D[Corticosteroids]:::action B -->|Chronic autoimmune background| E[Corticosteroids preferred]:::action C --> F{Response in 1-2 weeks?}:::decision F -->|Yes| G[Continue NSAIDs, taper]:::action F -->|No| H[Add/switch to corticosteroids]:::action D --> I[Prednisolone 20-40 mg/day]:::action E --> I I --> J[Taper over 2-4 weeks]:::action J --> K[Monitor TSH, free T4]:::action ``` ## Why Other Options Are Incorrect - **Levothyroxine monotherapy:** Inappropriate in acute phase; the patient is thyrotoxic (low TSH, high T4). Levothyroxine would worsen symptoms. It may be needed later if hypothyroidism develops. - **Methimazole:** An antithyroid drug used for Graves' disease, not thyroiditis. In thyroiditis, thyroid hormone elevation is from release, not synthesis — antithyroid drugs do not help. - **Iodine solution (Lugol's):** Iodine inhibits thyroid hormone release and is used in thyroid storm, not chronic thyroiditis management. It is not first-line for inflammation.