A 68-year-old man with a history of chronic epiphora and recurrent episodes of medial canthal swelling over the past 2 years presents with acute onset of fever (38.5°C), severe medial canthal pain, and chemosis. On examination, there is marked proptosis, restricted eye movements, and a tense, swollen medial canthal area. Conjunctival cultures grow Staphylococcus aureus. Which of the following is the most appropriate immediate management?

Explanation

## Management of Acute Dacryocystitis with Orbital Cellulitis **Key Point:** The presence of fever, proptosis, restricted eye movements, and chemosis indicates progression from simple dacryocystitis to orbital cellulitis—a surgical emergency requiring immediate hospitalization and IV antibiotics. ### Clinical Red Flags for Orbital Involvement | Sign | Significance | |------|---------------| | **Fever (38.5°C)** | Systemic infection, not localized | | **Proptosis** | Orbital edema/abscess | | **Restricted eye movements** | Orbital muscle involvement or mass effect | | **Chemosis** | Orbital venous congestion | | **Tense, swollen medial canthus** | Possible orbital abscess | **High-Yield:** Orbital cellulitis from dacryocystitis is a medical emergency because it can rapidly progress to cavernous sinus thrombosis, meningitis, or permanent vision loss if not treated aggressively. ### Pathophysiology of Progression 1. **Acute dacryocystitis** → Lacrimal sac infection with purulent material 2. **Rupture or spread** → Infected material breaches sac wall 3. **Orbital cellulitis** → Infection extends into orbital soft tissues 4. **Cavernous sinus thrombosis** → Septic thrombophlebitis of orbital veins (mortality ~10% even with treatment) ### Management Algorithm ```mermaid flowchart TD A[Acute Dacryocystitis + Orbital Signs]:::urgent --> B[Hospitalize immediately]:::action B --> C[IV Antibiotics]:::action C --> D[Broad-spectrum:<br/>Ceftriaxone + Vancomycin<br/>or Piperacillin-tazobactam]:::action B --> E[Imaging: CT/MRI orbit]:::action E --> F{Abscess present?}:::decision F -->|Yes| G[Surgical drainage<br/>+ probe/irrigate NLD]:::action F -->|No| H[Continue IV antibiotics<br/>48-72 hrs, then reassess]:::action G --> I[Follow with DCR<br/>after acute infection resolves]:::action H --> J{Clinical improvement?}:::decision J -->|Yes| K[Switch to oral antibiotics<br/>Complete 2-3 weeks]:::action J -->|No| L[Repeat imaging,<br/>consider drainage]:::action ``` **Clinical Pearl:** Staphylococcus aureus is the most common pathogen in dacryocystitis and orbital cellulitis. Vancomycin coverage is essential until MRSA is ruled out, especially in hospital-acquired or recurrent infections. **Warning:** Do NOT use topical antibiotics alone or oral antibiotics in the setting of orbital cellulitis—they do not achieve adequate intraorbital concentrations and delay definitive treatment. ### Antibiotic Selection **First-line IV regimens:** - **Ceftriaxone 1–2 g IV Q12H** + **Vancomycin 15–20 mg/kg IV Q8–12H** (covers MRSA) - **Piperacillin-tazobactam 4.5 g IV Q6H** (broad-spectrum alternative) **Duration:** Minimum 48–72 hours IV, then transition to oral if clinical improvement; total course 2–3 weeks. **Definitive Treatment:** After acute infection resolves (typically 2–4 weeks), perform **dacryocystorhinostomy (DCR)** to prevent recurrence by creating a new drainage pathway bypassing the obstructed nasolacrimal duct.