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Subacute thyroiditis — Clinical Guidelines

Overview

Subacute thyroiditis, also known as de Quervain's thyroiditis, is an inflammatory condition of the thyroid gland often triggered by viral infections, characterized by transient thyrotoxicosis followed by hypothyroidism. 1 6

Diagnosis

Clinical Symptoms: Fever, neck pain, tenderness, and transient thyrotoxicosis followed by hypothyroidism. 1 10

Laboratory Tests: Elevated ESR and CRP, low radioactive iodine uptake, presence of thyroglobulin antibodies. 1 5

Imaging: Ultrasound showing a "washed-out" appearance in the active phase; helpful for unilateral cases and differentiating cysts from hemorrhagic degeneration. 9

Differential Diagnosis: Includes giant cell arteritis, vocal cord paralysis, and infections like Chlamydia psittaci. 3 6 7 8

Management

First-Line Treatment: Glucocorticoids (e.g., prednisone) to reduce inflammation; dose and duration vary but typically tapered over weeks. 1 4

Adjunctive Treatments: Symptomatic management including analgesics for pain, thyroid hormone replacement if hypothyroidism develops. 1 10

Infection Management: Aggressive antibiotic therapy if infective complications like thyroid abscess occur, especially in patients on steroids. 4

Special Populations

Comorbidities: Patients with type 2 diabetes mellitus may require careful monitoring and management of blood glucose levels alongside thyroid treatment. 1

Vocal Cord Paralysis: Rare complication; may persist post-thyroiditis recovery; requires ENT evaluation and management. 7 8

Key Recommendations

Initiate glucocorticoid therapy for symptomatic subacute thyroiditis to manage inflammation and symptoms effectively. (Evidence: Moderate 1 4)

Monitor closely for complications such as vocal cord paralysis and thyroid abscess, especially in patients on steroid therapy. (Evidence: Weak 7 4)

Consider differential diagnoses including giant cell arteritis and infections when evaluating atypical presentations. (Evidence: Expert opinion 3 6)

References

1 Jiang H, Chen X, Wang L, Qian X, Zhang Y, Wu J et al.. Subacute thyroiditis complicated with multiple organ failure: A case report. Medicine 2022. link 2 García M, Albizua-Madariaga I, Lertxundi U, Aguirre C. Subacute thyroiditis and COVID-19 vaccines: a case/non-case study. Endocrine 2022. link 3 Tiwari U, Shailesh F, Pandey R. Subacute thyroiditis masquerading giant cell arteritis. The Journal of the Arkansas Medical Society 2014. link 4 Quin JD, Gray HW, Baxter JN, Thomson JA. Thyroid abscess complicating subacute thyroiditis: a consequence of steroid therapy?. Clinical endocrinology 1992. link 5 Mizukami Y, Michigishi T, Kawato M, Matsubara F. Immunohistochemical and ultrastructural study of subacute thyroiditis, with special reference to multinucleated giant cells. Human pathology 1987. link80271-x) 6 Schofield PM, Keal EE. Subacute thyroiditis associated with Chlamydia psittaci infection. Postgraduate medical journal 1986. link 7 Kallmeyer JC, Hackmann R. Vocal cord paralysis associated with subacute thyroiditis. A case report. South African medical journal = Suid-Afrikaanse tydskrif vir geneeskunde 1985. link 8 Langevitz P, Cabili S. Persistent vocal cord paralysis in subacute thyroiditis. Postgraduate medical journal 1983. link 9 Blum M, Passalaqua AM, Sackler JP, Pudlowski R. Thyroid echography of subacute thyroiditis. Radiology 1977. link 10 Carenfelt C. Subacute thyroiditis. A diagnosis in otolaryngology. ORL; journal for oto-rhino-laryngology and its related specialties 1975. link

Subacute thyroiditis