## Acute Suppurative Thyroiditis: Microbial Infection ### Pathophysiology Acute suppurative thyroiditis is a rare but serious bacterial infection of the thyroid gland, typically following an upper respiratory tract infection or haematogenous spread. The condition presents with acute inflammation, abscess formation, and suppurative necrosis. ### Drug of Choice **Key Point:** Broad-spectrum antibiotics are the cornerstone of treatment for acute suppurative thyroiditis. First-line agents include amoxicillin-clavulanate or cephalosporins (e.g., ceftriaxone), chosen to cover common respiratory pathogens (Streptococcus pyogenes, Staphylococcus aureus) and gram-negative organisms. ### Adjunctive Management | Intervention | Indication | Rationale | |---|---|---| | Broad-spectrum antibiotics | First-line, empirical | Cover β-haemolytic streptococci, Staph aureus, gram-negatives | | Drainage/aspiration | Abscess formation | Relieve pressure, obtain culture, guide antibiotic therapy | | Thyroid hormone (levothyroxine) | Post-acute phase | Prevent hypothyroidism if thyroid function impaired | | NSAIDs or acetaminophen | Symptomatic relief | Reduce pain and fever | | Beta-blockers (propranolol) | Thyrotoxicosis only | Control adrenergic symptoms from released thyroid hormone | ### Clinical Pearl **High-Yield:** Acute suppurative thyroiditis is a medical emergency requiring rapid antibiotic initiation. Culture and sensitivity from aspirate or drainage should guide definitive antibiotic selection. Delay in treatment risks sepsis and thyroid abscess rupture. ### Why Propranolol is Not First-Line Propranolol addresses only the adrenergic manifestations of thyrotoxicosis (tachycardia, tremor) but does not treat the underlying bacterial infection. It is an adjunct, not primary therapy. ### Why Levothyroxine is Not First-Line Levothyroxine is reserved for post-acute management or if permanent hypothyroidism develops. It plays no role in the acute suppurative phase. ### Why Prednisolone is Not First-Line Systemic corticosteroids are contraindicated in acute bacterial infection as they impair immune response and increase risk of dissemination. Steroids are used only in specific autoimmune thyroiditis variants (e.g., subacute de Quervain thyroiditis), not in suppurative disease. [cite:Harrison 21e Ch 405]
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