Which statements correctly describe subacute (de Quervain) thyroiditis?

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Subacute (De Quervain) Thyroiditis: Key Clinical Features

All five statements (A through E) are correct regarding subacute thyroiditis. Based on authoritative guidelines and clinical evidence, subacute thyroiditis is a self-limited inflammatory condition with specific diagnostic and therapeutic characteristics 1.

Clinical Presentation

Subacute thyroiditis characteristically presents with moderate-to-severe thyroid pain, often radiating to the ears, jaw, or throat, accompanied by fever and systemic symptoms 1. The pain typically begins focally and spreads throughout the gland over several weeks. Patients experience:

  • Malaise and low-grade fever
  • Fatigue in addition to thyrotoxic symptoms
  • Firm, painful thyroid on palpation
  • Elevated erythrocyte sedimentation rate or C-reactive protein
  • Mild anemia 1

This confirms statement B is correct.

Etiology and Predisposing Factors

Subacute thyroiditis is thought to be caused by viral infection 1. While often associated with recent upper respiratory tract infections 2, the condition can occur without a clearly identifiable predisposing factor in many cases. The viral etiology means statement A is correct - there is not always a specific identifiable trigger.

Long-term Outcomes

Hypothyroidism Risk

A small percentage of patients develop permanent hypothyroidism following subacute thyroiditis 3, 4. The natural course includes:

  • Initial thyrotoxic phase with elevated thyroid hormones
  • Intermediate phase with transient subclinical hypothyroidism (56% of patients show increased TSH reserve on TRH testing) 4
  • Less than 1% develop permanent hypothyroidism 3
  • In one study, 3 of 62 patients (approximately 5%) developed overt permanent hypothyroidism 4

This confirms statement C is correct.

Recurrence Potential

While the guidelines note that "symptoms can recur as the dose of corticosteroid is reduced" 1, and research indicates "recurrences do appear in a small percentage of patients" 3, statement D claiming it does not recur is incorrect. Repeat exacerbations are uncommon but do occur, occasionally necessitating restoration of higher corticosteroid doses 3.

Treatment Approach

Corticosteroids are a cornerstone of treatment for moderate-to-severe subacute thyroiditis 1. The therapeutic algorithm is:

Mild Symptoms

  • Beta-adrenergic blocking drugs
  • Nonsteroidal anti-inflammatory agents 1

Moderate-to-Severe Symptoms or Treatment Failure

  • Prednisone 40 mg daily initially
  • Gradual taper over 2-4 weeks, then continued reduction over 2-3 months 1
  • Corticosteroids typically produce rapid symptom relief within 24-48 hours 3

This confirms statement E is correct.

Important Clinical Caveats

  • Antithyroid drugs have no role - the thyrotoxicosis results from hormone leakage, not increased synthesis 1
  • Radioactive iodine uptake (RAIU) is characteristically low 1
  • Levothyroxine may be needed during the hypothyroid phase but should be withdrawn after 3-6 months with verification of normal function 1
  • Thyroidectomy should only be considered in the very small minority with repeated relapses despite appropriate treatment 3

Summary of Answer Options

  • A: Correct - Often no specific predisposing factor identified
  • B: Correct - Classic presentation includes painful, enlarged thyroid and fever 1
  • C: Correct - Less than 1-5% may develop permanent hypothyroidism 3, 4
  • D: Incorrect - Recurrences can occur, though uncommon 3
  • E: Correct - Corticosteroids are recommended for moderate-to-severe cases 1

Therefore, statements A, B, C, and E are correct; only statement D is false.

References

1
Guideline

hyperthyroidism and other causes of thyrotoxicosis: management guidelines of the american thyroid association and american association of clinical endocrinologists.

Endocrine practice : official journal of the American College of Endocrinology and the American Association of Clinical Endocrinologist, 2011

3
Research

The management of subacute (DeQuervain's) thyroiditis.

Thyroid : official journal of the American Thyroid Association, 1993

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