A 32-year-old man from Delhi presents with acute onset proptosis, chemosis, ophthalmoplegia, and fever for 2 days. He reports a history of rhinosinusitis 1 week ago. On examination, visual acuity is 6/9 in both eyes, intraocular pressure is elevated, and fundus shows early disc edema. Blood cultures are pending. What is the most appropriate immediate next step in management?

Explanation

## Clinical Context This patient presents with classic signs of acute orbital cellulitis: proptosis, chemosis, ophthalmoplegia, fever, and a clear predisposing factor (recent rhinosinusitis). The elevated intraocular pressure and early disc edema indicate orbital involvement with risk of vision loss. ## Management Algorithm for Orbital Cellulitis ```mermaid flowchart TD A[Suspected orbital cellulitis]:::outcome --> B{Clinical signs present?}:::decision B -->|Proptosis, chemosis, ophthalmoplegia, fever| C[Confirm diagnosis: CT/MRI orbit]:::action C --> D[Blood cultures + labs]:::action D --> E[Start IV broad-spectrum antibiotics immediately]:::action E --> F{Abscess/loculation on imaging?}:::decision F -->|Yes| G[Surgical drainage + antibiotics]:::action F -->|No| H[Continue IV antibiotics 2-4 weeks]:::action H --> I[Oral antibiotics 2-4 weeks]:::action I --> J[Clinical resolution]:::outcome ``` ## Key Management Principles **Key Point:** Orbital cellulitis is a medical emergency. The standard of care is **immediate empiric IV broad-spectrum antibiotics** (ceftriaxone 2 g IV 6-hourly + vancomycin 15–20 mg/kg IV 8–12-hourly) **before imaging**, as delay increases risk of permanent vision loss, cavernous sinus thrombosis, and meningitis. **High-Yield:** Do NOT delay antibiotics while waiting for imaging or culture results. Blood cultures should be drawn, but results take 24–48 hours. Imaging (CT or MRI) is essential to: - Confirm diagnosis - Identify source (sinusitis, abscess, foreign body) - Detect complications (abscess, cavernous sinus involvement) - Guide surgical intervention if needed **Clinical Pearl:** Orbital abscess (loculated collection) occurs in ~10–15% of cases and requires surgical drainage in addition to antibiotics. Imaging guides this decision, but antibiotics must not be withheld pending imaging. **Warning:** Lumbar puncture is contraindicated in suspected orbital cellulitis until imaging excludes mass effect and raised intracranial pressure. Meningitis is a *complication*, not a prerequisite for diagnosis. ## Antibiotic Coverage Ceftriaxone covers most aerobic gram-positive and gram-negative organisms; vancomycin covers MRSA and penicillin-resistant pneumococci. Once culture results are available (48–72 hours), de-escalate if appropriate. ## Duration - IV antibiotics: 2–4 weeks (depending on response) - Followed by oral antibiotics: 2–4 weeks - Total: 4–8 weeks ## Adjunctive Measures - Elevation of head of bed - Topical antibiotics for associated conjunctivitis - NSAIDs for pain and inflammation (not first-line) - Treat underlying sinusitis (may require ENT consultation and imaging-guided drainage)