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Orbital Cellulitis

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Orbital Cellulitis

Key Points

  • Periorbital (preseptal) cellulitis affects the tissues anterior to the orbital septum; orbital (postseptal) cellulitis involves the deeper orbital tissues.
  • Most commonly caused by Staphylococcus aureus, Streptococcus pneumoniae, or Streptococcus pyogenes; most prevalent in pediatric clients.
  • Orbital cellulitis is a surgical emergency — decreased eye movement, reduced vision, and proptosis indicate deep tissue involvement.
  • Potential complications include abscess formation, cavernous sinus thrombosis, meningitis, and vision loss.

Pathophysiology

Periorbital cellulitis involves bacterial infection of the soft tissues surrounding the eye, anterior to the orbital septum. It commonly arises from direct inoculation (trauma, insect bite) or spread from adjacent sinusitis. In sinusitis-related cases, bacteria spread from the sinuses to the periorbital region via the venous system or by direct tissue extension. When infection breaches the orbital septum and involves the deeper orbital structures (fat, muscles, nerves), it becomes orbital cellulitis, which threatens vision and carries risk of intracranial complications. The resulting inflammatory response causes edema, erythema, and progressive tissue involvement.

Clinical Manifestations

  • Periorbital (preseptal): Redness and swelling around the eye, swollen eyelid, mild tenderness; eye movement and vision are preserved.
  • Orbital (postseptal): Decreased or absent eye movement (ophthalmoplegia), reduced visual acuity, pain with eye movement, proptosis (eye bulging forward), fever.
  • Both forms may present with red, swollen eyelids.
  • Systemic signs: fever, malaise, irritability (especially in children).

Nursing Assessment

NCLEX Focus

The critical distinction is periorbital versus orbital cellulitis. Orbital cellulitis features restricted eye movement, reduced vision, and proptosis — this is a surgical emergency requiring IV antibiotics and possible drainage.

  • Assess for cardinal signs: eyelid swelling, erythema, tenderness, and warmth.
  • Evaluate extraocular movements (EOM): restriction suggests orbital involvement.
  • Assess visual acuity in both eyes.
  • Monitor temperature and vital signs for systemic infection.
  • Review imaging results: CT scan distinguishes periorbital from orbital cellulitis and identifies abscess formation.
  • Assess for signs of intracranial complications: severe headache, altered mental status, meningeal signs.

Nursing Interventions

  • Administer prescribed IV antibiotics (broad-spectrum coverage targeting common pathogens; typically ampicillin-sulbactam or ceftriaxone plus vancomycin for MRSA coverage).
  • Apply warm compresses to reduce swelling and promote comfort.
  • Elevate the head of bed to reduce periorbital edema.
  • Monitor for worsening signs indicating orbital involvement or intracranial spread: decreased EOM, declining visual acuity, altered consciousness.
  • Prepare for surgical consultation if abscess formation is identified on CT or if there is no improvement within 24-48 hours of IV antibiotics.
  • Educate parents on completing the full antibiotic course and signs of recurrence.
  • Assess and treat underlying causes (sinusitis management, wound care for traumatic etiology).

Intracranial Complications

Orbital cellulitis can spread to the cavernous sinus or meninges. Report immediately: severe headache, high fever, altered mental status, bilateral eye involvement, or cranial nerve palsies.

Self-Check

  1. What clinical findings distinguish orbital cellulitis from periorbital cellulitis?
  2. What imaging study is used to differentiate preseptal from postseptal involvement?
  3. What intracranial complications can result from orbital cellulitis?

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