How do I perform incision and drainage of a peritonsillar abscess in a patient already receiving ceftriaxone?

How to Perform Incision and Drainage of a Peritonsillar Abscess

Perform incision and drainage under local anesthesia as the primary treatment for peritonsillar abscess, continuing the ceftriaxone already initiated, as this approach is safe, effective, and can be done at the bedside or in the emergency department.

Procedural Approach

Patient Preparation

• Continue the ceftriaxone already being administered—it provides appropriate coverage for the typical pathogens (streptococci in 62% of cases, with 97% responding to beta-lactam antibiotics) 1
• Position the patient upright or semi-upright to prevent aspiration
• Have suction immediately available
• Ensure adequate lighting with headlamp or overhead light

Anesthesia Technique

• Apply topical anesthetic spray (lidocaine 10%) to the oropharynx
• Infiltrate local anesthetic (1-2% lidocaine with epinephrine) at the point of maximal fluctuance
• Wait 3-5 minutes for adequate anesthesia

Drainage Procedure

Two acceptable techniques exist:

1. Needle Aspiration (initial approach):

   • Use an 18-gauge needle on a 10-20 mL syringe
   • Insert at the point of maximal fluctuance (typically superior and lateral to the tonsil)
   • Advance no more than 1 cm to avoid carotid injury
   • Aspirate while advancing
   • Success rate: 87% 1

2. Incision and Drainage (if aspiration fails or preferred):

   • Make a 1-1.5 cm vertical incision at the point of maximal fluctuance
   • Use a #11 blade, limiting depth to 1 cm
   • Spread with curved hemostat to break up loculations
   • Allow drainage and have patient expectorate
   • Success rate: 90% 1

Critical Safety Points

Anatomical Landmarks to Avoid

• Stay medial and superior: The internal carotid artery lies 2.5 cm posterolateral to the tonsil
• Limit depth to 1 cm maximum: Deeper penetration risks vascular injury
• Avoid the inferior pole: Higher risk of vascular structures

When to Choose Incision Over Aspiration

• Thick, loculated pus that cannot be aspirated
• Failed initial needle aspiration (occurs in 13% of cases) 2
• Very large abscess (>3 cm)

Post-Procedure Management

Immediate Care

• Continue ceftriaxone IV (already initiated)—no additional antibiotics needed 3
• Prescribe oral analgesics (NSAIDs plus acetaminophen; avoid opioids if possible)
• Encourage oral hydration and soft diet immediately
• Most patients resume normal diet within 24-48 hours 4

Disposition

• Outpatient management is appropriate for most patients who can tolerate oral intake 1
• Admit only if: severe dehydration, airway compromise, inability to tolerate oral intake, or immunocompromised
• Mean hospital stay when admission needed: 1.55 days 5

Follow-up

• Recheck in 24-48 hours (can be by phone if improving)
• Complete 7-10 days of oral antibiotics (amoxicillin-clavulanate or clindamycin)
• Recurrence rate with drainage alone: 2.8% ipsilaterally, 0% contralaterally 6

Tonsillectomy Considerations

Do NOT routinely recommend immediate or interval tonsillectomy after first peritonsillar abscess 7.

Indications for Tonsillectomy

• Only after >1 peritonsillar abscess (recurrence) 7
• Multiple antibiotic allergies/intolerance
• PFAPA syndrome

Why Avoid Routine Tonsillectomy

• Postoperative bleeding requiring treatment: 11.4% 6
• Longer absence from work
• Higher rates of subsequent pharyngitis requiring work absence 6
• Very low recurrence rate (2.8%) makes prophylactic surgery unnecessary 6

Common Pitfalls to Avoid

1. Don't wait for ENT consultation if you're trained—this is an emergency medicine/primary care procedure 5, 1
2. Don't add additional antibiotics—ceftriaxone provides adequate coverage 3
3. Don't routinely order CT imaging—only needed if parapharyngeal extension suspected 6
4. Don't advance needle/blade >1 cm depth—risk of carotid injury
5. Don't automatically schedule tonsillectomy—recurrence is rare and doesn't justify routine surgery 6