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Panophthalmitis - Complete Viva Questions & Answers

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Q1. Define panophthalmitis and distinguish it from endophthalmitis.

• Endophthalmitis is inflammation of the interior of the eye involving the vitreous humor. It does not extend beyond the sclera.
• Panophthalmitis is inflammation of the entire eye - the interior (vitreous, retina, choroid) plus the sclera, extending into the orbit (peri-ocular tissues).

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Q2. How is panophthalmitis / endophthalmitis classified?

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Q3. What are the common causative organisms in panophthalmitis?

• Staphylococcus epidermidis - most common post-cataract
• Staphylococcus aureus
• Streptococcal species
• Gram-negative organisms: Pseudomonas, Klebsiella, Proteus, Enterobacter, E. coli, Haemophilus influenzae
• Anaerobes (less common)

• Staphylococcus, Streptococcus, Bacillus cereus (highly virulent - associated with soil/organic matter contamination)
• Fungal species (especially with organic matter - soil, vegetable matter)
• Mixed flora

• Klebsiella pneumoniae (invasive syndrome - especially in East Asia, associated with liver abscess)
• Pseudomonas aeruginosa - causes a fulminant panophthalmitis; severe pain, chemosis, anterior uveitis, vitreous involvement
• Candida species - especially in IV drug users or systemic candidemia
• Bacillus cereus (rare, very destructive)

Examiner tip: Bacillus cereus is notorious for causing rapidly destructive panophthalmitis within 12-24 hours of penetrating trauma, especially from soil-contaminated injuries.

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Q4. Describe the clinical features (symptoms and signs) of panophthalmitis.

• Severe, deep ocular pain (cardinal feature - more severe than endophthalmitis alone)
• Drastically decreased visual acuity (may be light perception or no light perception)
• Photophobia
• Fever, malaise (especially in endogenous cases)

• Eyelid edema and erythema
• Marked conjunctival chemosis and injection
• Corneal edema, corneal ring ulcer (characteristic of virulent gram-negative organisms)
• Hypopyon (pus in anterior chamber)
• Absent red reflex
• Iris microabscesses

• Dense vitritis
• Retinal inflammatory infiltrates
• Flame-shaped retinal hemorrhages ± white centers (Roth spots)
• Retinal/subretinal/choroidal abscesses

• Proptosis
• Restricted extraocular movements
• Periorbital edema and erythema
• Leukocytosis

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Q5. What investigations would you order in a suspected case of panophthalmitis?

1. B-scan ultrasonography - to assess posterior segment when view is limited; confirms vitritis, membranes, choroidal thickening, retinal detachment; establishes baseline for treatment response
2. Anterior chamber paracentesis (0.2 mL) - for Gram stain, culture (blood, chocolate, Sabouraud, thioglycolate media), and sensitivities
3. Vitreous tap / diagnostic vitrectomy - more sensitive than AC tap; mandatory if visual acuity is light perception or worse
4. CT orbit (axial, coronal, parasagittal views with 1-mm cuts) - especially in traumatic cases to rule out intraocular foreign body (IOFB), assess orbital extension, detect gas-forming organisms

• Blood cultures (aerobic and anaerobic) × 2 sets
• Complete blood count with differential (leukocytosis expected)
• Blood glucose, HbA1c (diabetes is a major risk factor for Klebsiella endogenous panophthalmitis)
• Liver function tests + abdominal ultrasound/CT (Klebsiella liver abscess as primary source)
• Echocardiogram if endocarditis suspected
• Chest X-ray (pulmonary source for hematogenous spread)
• Infectious disease consult

• Blood agar (aerobic bacteria)
• Chocolate agar (fastidious organisms, Haemophilus)
• Sabouraud dextrose agar (fungi)
• Thioglycolate broth (anaerobes)
• Gram and Giemsa stains on smears

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Q6. What is the treatment of panophthalmitis? Give specific drug names and doses.

Step 1: Hospitalization

• Mandatory - patient requires IV antibiotics, close monitoring q12-24h

Step 2: Cultures before antibiotics

• AC tap / vitreous tap for Gram stain, culture, sensitivity

Step 3: Intravitreal antibiotics (most important step)

Caution: Aminoglycosides (amikacin) carry risk of macular infarction - use cautiously. Repeat intravitreal antibiotics every 48-72 hours as needed.

Step 4: Systemic (IV/oral) antibiotics

• Ciprofloxacin 400 mg IV q12h OR Moxifloxacin 400 mg PO/IV daily
• Cefazolin 1 g IV q8h
• Fluoroquinolones (moxifloxacin) achieve therapeutic vitreous levels - an advantage over many other systemic antibiotics
• Adjust for renal function and pediatric dosing

Step 5: Topical therapy

• Fortified antibiotics: Vancomycin + tobramycin q1h (around the clock for 24-48 hours) - especially if bleb, wound leak, or exposed sutures
• Atropine 1% b.i.d.-t.i.d. (cycloplegia, pain relief, prevents synechiae)
• Topical steroids (prednisolone acetate 1% q1h) - for anterior segment inflammation

Step 6: Intravitreal corticosteroids

• Dexamethasone 0.4 mg/0.1 mL - considered in severe vitreous inflammation (reduces secondary inflammatory damage)

Step 7: Pars plana vitrectomy (PPV)

• Definitive indication: Visual acuity = light perception or worse (post-cataract endophthalmitis - from EVS trial data)
• PPV reduces infectious burden, obtains material for culture, removes inflammatory mediators
• In traumatic cases: removes IOFB (paramount for infection control) and inflammatory debris
• Benefit in non-surgical endophthalmitis cases is less defined but generally recommended in panophthalmitis

Step 8: Removal of IOFB (in traumatic panophthalmitis)

• Paramount - retained foreign bodies perpetuate infection

Step 9: Tetanus prophylaxis

• Tetanus toxoid 0.5 mL IM if immunization not up to date (traumatic cases)

Step 10: Evisceration / Enucleation

• When the eye is irretrievably lost, severely painful, and there is risk to the contralateral eye (sympathetic ophthalmia) or life
• Evisceration: removal of intraocular contents, scleral coat preserved - preferred for infection control, faster, lower risk of meningitis spread in some settings
• Enucleation: removal of entire globe - indicated if tumor is suspected or optic nerve involvement

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Q7. What is the Endophthalmitis Vitrectomy Study (EVS) and what did it show?

1. Immediate PPV is beneficial when visual acuity is light perception or worse - patients with LP or worse VA who underwent PPV had a 3-fold better chance of achieving 20/40 or better vision compared to vitreous tap alone.
2. Systemic antibiotics (IV amikacin + cefazolin) provided NO additional benefit over intravitreal antibiotics alone in post-cataract endophthalmitis.
3. Subconjunctival antibiotics were used in the original protocol but are now rarely used.

Important limitation: The EVS specifically studied post-cataract endophthalmitis. Its results do NOT directly apply to post-traumatic, bleb-related, or endogenous panophthalmitis - systemic antibiotics may still be important in those scenarios.

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Q8. What is the difference between evisceration and enucleation? When is each done in panophthalmitis?

• Faster procedure
• Better cosmesis (scleral shell preserved)
• Direct access to infected contents for drainage/culture
• Reduces septic focus

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Q9. What organisms cause endogenous panophthalmitis, and what systemic conditions predispose to it?

• Klebsiella pneumoniae - invasive syndrome: liver abscess → hematogenous spread to eye; classically in diabetic East Asian patients; [associated with 6-year Chinese study showing high mortality - PMID 34280072]
• Pseudomonas aeruginosa - fulminant; described in bacteremia; also linked to contaminated artificial tears (carbapenem-resistant strains causing outbreaks in the USA per Harrison's 22e)
• Candida albicans / tropicalis - IV drug users, systemic candidemia, TPN patients, immunocompromised
• Aspergillus - immunocompromised, post-transplant
• Bacillus cereus - post-traumatic / IV drug use
• Streptococcus pneumoniae, S. aureus - from pulmonary or skin source

• Diabetes mellitus (most important risk factor for Klebsiella)
• Immunosuppression (HIV/AIDS, transplant, chemotherapy)
• IV drug use (fungal/bacterial)
• Infective endocarditis
• Meningitis (Neisseria meningitidis)
• Septicemia
• Pulmonary infections
• Hepatobiliary disease (Klebsiella liver abscess)
• Total parenteral nutrition (Candida)

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Q10. What are the differentials of panophthalmitis?

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Q11. What is the role of steroids in management of endophthalmitis/panophthalmitis?

• Prednisolone acetate 1% q1h - controls anterior segment inflammation, reduces secondary scarring

• 0.4 mg/0.1 mL - given alongside intravitreal antibiotics in severe vitreous inflammation
• Rationale: reduces cytokine-mediated retinal damage once infection is being controlled

• Oral prednisone 60 mg/day for 5 days - was part of the original EVS protocol
• Current use depends on: causative organism (avoid in fungal), patient comorbidities (caution in diabetics), severity and duration
• Once infection is sterilized, the post-endophthalmitis inflammation can be significant and should be treated aggressively

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Q12. What is the prognosis of panophthalmitis, and what factors determine outcome?

• Virulent organisms (Bacillus cereus, Pseudomonas, Streptococcus) - rapid destruction within hours
• Delayed presentation / delayed treatment
• Visual acuity at presentation of light perception or worse
• Traumatic etiology with IOFB
• Immunocompromised host
• Endogenous source (mortality risk from systemic sepsis)

• Less virulent organisms (S. epidermidis - most favorable)
• Early presentation and treatment
• Hand motion or better visual acuity at presentation
• Post-surgical rather than traumatic etiology

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Q13. What is the significance of a "corneal ring ulcer" in panophthalmitis?

• Gram-negative infection, particularly Pseudomonas aeruginosa or Acanthamoeba
• Indicates involvement of the limbal arcade and peripheral corneal stroma
• Suggests an antigen-antibody immune complex deposition mechanism at the limbus
• In Pseudomonas endophthalmitis/panophthalmitis, the disease is described as fulminant with rapid visual deterioration, fever, leukocytosis, proptosis, corneal ring ulcer, and panophthalmitis

• Immediate intravitreal + systemic gram-negative coverage
• Surgical intervention (PPV)

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Q14. What is sympathetic ophthalmia and how does it relate to panophthalmitis / penetrating trauma?

• Penetrating trauma causing panophthalmitis is a risk factor
• To prevent sympathetic ophthalmia in a blind, painful eye, enucleation within 2 weeks of the inciting trauma was classically recommended (before the inflammatory response becomes self-sustaining)
• Once sympathetic ophthalmia has developed, enucleation of the exciting eye may not prevent progression in the sympathizing eye

• This is the primary reason for considering enucleation rather than evisceration - evisceration may not remove all uveal tissue and theoretically carries a (disputed) risk of sympathetic ophthalmia
• Treatment of sympathetic ophthalmia: high-dose systemic corticosteroids, immunosuppressants (mycophenolate, azathioprine, cyclosporine)

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Q15. A patient presents 2 days after cataract surgery with severe eye pain, hypopyon, and absent red reflex. Visual acuity is light perception. What is your management?

1. Immediate hospitalization - ophthalmic emergency
2. Cultures first: Vitreous tap (0.2 mL) + anterior chamber paracentesis (0.2 mL) - Gram stain, blood agar, chocolate agar, Sabouraud, thioglycolate
3. Intravitreal antibiotics immediately:
   • Vancomycin 1 mg/0.1 mL (Gram-positive coverage)
   • Ceftazidime 2.2 mg/0.1 mL (Gram-negative coverage)
   • ± Dexamethasone 0.4 mg/0.1 mL intravitreally
4. Immediate pars plana vitrectomy - VA = LP is the EVS threshold; PPV gives 3× better visual outcome vs tap alone
5. Topical therapy:
   • Prednisolone acetate 1% q1h
   • Atropine 1% b.i.d.-t.i.d.
   • Fortified vancomycin + tobramycin q1h (if wound leak/bleb)
6. Systemic antibiotics: Moxifloxacin 400 mg PO/IV daily (achieves therapeutic vitreous levels) - not proven to improve outcomes per EVS, but used in severe/bleb-related cases
7. Follow up q12-24h: Relief of pain at 48h is a good prognostic sign. If no improvement at 48h - repeat intravitreal antibiotics; reassess for drug-resistant organisms or fungal etiology
8. If cultures grow organism - narrow antibiotics accordingly

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Summary Table: High-Yield Viva Points