A 22-year-old woman from Bangalore presents with acute onset sore throat, fever (38.8°C), and dysphagia for 2 days. On examination, she has bilateral tonsillar enlargement with white exudate, cervical lymphadenopathy, and no trismus. Rapid strep test is positive. She is prescribed oral amoxicillin and paracetamol. After 48 hours of treatment, her symptoms improve, fever subsides, and she can swallow normally. However, 5 days later, she presents again with recurrent sore throat, fever, and now unilateral throat pain with difficulty swallowing on the left side. Intraoral ultrasound confirms a 2 cm fluid collection in the left peritonsillar space. What is the most appropriate next step in management?

Explanation

## Management of Peritonsillar Abscess: Needle Aspiration & Drainage ### Clinical Context: Recurrent PTA **Key Point:** This patient has developed a peritonsillar abscess following initial successful treatment of acute tonsillitis. The presence of a confirmed fluid collection (2 cm) on ultrasound mandates drainage, as antibiotics alone cannot penetrate an abscess cavity effectively. ### Why Needle Aspiration Is the Correct First Step | Aspect | Rationale | |--------|----------| | **Diagnostic** | Confirms pus (culture & sensitivity guide antibiotics) | | **Therapeutic** | Relieves pressure, improves symptoms | | **Minimally invasive** | Can be done under local anesthesia | | **Imaging-guided** | Ultrasound reduces complications | | **Allows culture** | Identifies causative organism and resistance patterns | ### Management Algorithm for PTA ```mermaid flowchart TD A[Peritonsillar Abscess Confirmed]:::outcome --> B{Airway compromised?}:::decision B -->|Yes, severe| C[Secure airway, ICU monitoring]:::urgent B -->|No| D[Needle aspiration under ultrasound]:::action C --> E[I&D under GA after airway secured]:::action D --> F{Pus obtained?}:::decision F -->|Yes| G[Send for culture & sensitivity]:::action F -->|No| H[Repeat aspiration or formal I&D]:::action G --> I[IV broad-spectrum antibiotics]:::action H --> I I --> J[Supportive care: fluids, analgesia, steroids]:::action J --> K{Clinical improvement?}:::decision K -->|Yes| L[Continue IV antibiotics 7-10 days, then oral]:::action K -->|No| M[Formal incision & drainage under GA]:::action L --> N[Elective tonsillectomy after 6-8 weeks]:::action M --> N ``` ### Needle Aspiration Technique **High-Yield:** Needle aspiration is both diagnostic and therapeutic: 1. **Patient positioning:** Supine or semi-recumbent, head extended 2. **Anesthesia:** Topical spray (lignocaine 10%) + local infiltration (1% lignocaine) 3. **Ultrasound guidance:** Real-time visualization of needle entry into abscess 4. **Needle:** 18–20 gauge needle on syringe 5. **Aspiration site:** Lateral to tonsil, between anterior and posterior pillars 6. **Specimen:** Send for Gram stain, culture, sensitivity, and anaerobic culture 7. **Immediate relief:** Patient often experiences dramatic symptom improvement **Clinical Pearl:** Ultrasound-guided aspiration has sensitivity and specificity >90% for confirming PTA and is safer than blind needle aspiration. ### Antibiotic Regimen After Aspiration **Empiric IV therapy (pending culture results):** - **First-line:** Ampicillin-sulbactam 3 g IV q6h - OR Ceftriaxone 1–2 g IV q12h + Metronidazole 500 mg IV q8h - **Covers:** Group A Streptococcus, anaerobes (Peptostreptococcus, Prevotella, Fusobacterium, Bacteroides) **Duration:** - IV antibiotics: 7–10 days - Switch to oral (amoxicillin-clavulanate or cephalexin) for total 2–3 weeks **Mnemonic: CRAM** — Culture before antibiotics, Repeat aspiration if no improvement, Anaerobic coverage mandatory, Metronidazole for anaerobes ### Why Other Options Are Incorrect **Option A (Continue IV antibiotics and observe):** - Antibiotics alone cannot penetrate an established abscess cavity (poor vascular supply) - Continued suppuration risks airway obstruction and systemic complications - Drainage is mandatory once abscess is confirmed **Option C (Immediate tonsillectomy):** - Acute tonsillectomy in the setting of active abscess carries high morbidity (hemorrhage, infection spread) - Tonsillectomy is reserved for elective removal 6–8 weeks after resolution - Acute cases may require tonsillectomy only if recurrent PTA or if I&D fails - First step is always drainage, not definitive surgery **Option D (Repeat strep test and switch antibiotics):** - Rapid strep test does not diagnose abscess; it identifies Group A Streptococcus - Antibiotic failure is due to poor penetration into abscess, not resistant organism - Changing oral antibiotics will not address the need for drainage - Wastes critical time and delays definitive management ### Indications for Formal I&D Under General Anesthesia - Needle aspiration yields no pus (false negative) - No clinical improvement 24–48 hours after needle aspiration - Large abscess (>3 cm) or multiple loculations - Airway compromise - Patient unable to cooperate with needle aspiration ### Follow-up and Tonsillectomy **Key Point:** Elective tonsillectomy is recommended after 6–8 weeks of recovery to prevent recurrence. Indications include: - **Recurrent PTA** (≥2 episodes) - **Single episode** with significant morbidity - **Chronic tonsillitis** with recurrent infections **Clinical Pearl:** Tonsillectomy performed acutely during abscess increases hemorrhage risk; wait for inflammation to resolve. ### Complications to Monitor - **Airway obstruction** (most common serious complication) - **Aspiration pneumonia** - **Lemierre's syndrome** (septic thrombophlebitis of internal jugular vein) — rare but life-threatening - **Mediastinitis** (if infection spreads downward) **Warning:** If patient develops stridor, severe dyspnea, or signs of sepsis, escalate to ICU and consider emergency airway management. [cite:Robbins 10e Ch 16] [cite:Harrison 21e Ch 31] [cite:Park 26e Ch 3]