Endophthalmitis

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Mohamed Moubarak, M.D. [2]

Enophthalmitis may be classified according to causative organisms into 2 subtypes: Bacterial and fungal.

• Bacterial endophthalmitis
• Fungal endophthalmitis

Additionally, endophthalmitis is classified as either endogenous or exogenous based on the route of infection.

• Exogenous endophthalmitis
  • Post-operative endophthalmitis
  • Bleb-related endophthalmitis
  • Post-traumatic endophthalmitis
• Endogenous endophthalmitis

Overview

Endophthalmitis is an inflammation of the internal coats of the eye. It is a dreaded complication of all intraocular surgeries, particularly cataract surgery, with possible loss of vision and the eye itself. Infectious etiology is the most common and various bacteria and fungi have been isolated as the cause of the endophthalmitis. Other causes include penetrating trauma and retained intraocular foreign bodies.

Pathophysiology

Pathogenesis

Endophthalmitis is an ocular inflammation resulting from the introduction of an infectious agent, either bacterial or fungal, into the posterior segment of the eye. Infectious agents are introduce to the anterior and posterior segments of the eye exogenously or endogenously.

Exogenous enophthalmitis most commonly occurs following cataract surgery (approximately 90% of all cases) Beside cataract, nearly all other type of ocular surgery, such as glaucoma, retinal, radial keratotomy, and intravitreal injections, may be able to disturb the eye globe integrity and contaminate the aqueous humor and/or vitreous. Most commonly endophthalmitis occurs following penetrating ocular injuries. Following penetrating injury, the eye globe integrity disturbed. Penetrating ocular injuries are accompanied by infection at a much higher rate compere to those with ocular surgery. It is also associated with a greater variety of organisms. The most common isolated organisms include Gram-positive Staphylococcus epidermidis and Streptococcus.

Endogenous endophthalmitis is caused by the hematologic dissemination of an infection to the eyes. Most common extraocular foci of infection include liver abscess, pneumonia, endocarditis, and soft tissue infection. Endogenous endophthalmitis is commonly associated with immunosuppression or procedures that increase the risk for blood-borne infections, such as diabetes, HIV, malignancy, intravenous drug use, transplantation, immunosuppressive therapy, and catheterization.

Gross Pathology

On gross pathology, eyelid swelling, eyelid erythema, injected conjunctiva and sclera, hypopyon, chemosis, and mucoprulunt dischage are characteristic findings of exogenous bacterial endophthalmitis.

Microscopic histopathological analysis

On microscopic histopathological analysis, infiltration of polymorphonuclear leukocytes or chronic inflammatory cells (depending on the duration of the inflammation) and destruction of ocular structures are characteristic findings of bacterial endophthalmitis.

Causes

Drug side-effect

• Dexamethasone implant

Infectious

Common bacterial and fungal causes of endophthalmitis include:

• Bacterial
  • Staphylococcus epidermidis
  • Staphylococcus aureus
  • Streptococci spp.
  • Enterococci spp.
  • Bacillus spp.
  • Escherichia coli
  • Neisseria meningitidis
  • Klebsiella spp.
  • Propionibacterium spp.
  • Corynebacterium spp.
  • Pseudomonas aeruginosa
  • Candida spp.
  • Aspergillus spp.
  • Fusarium spp.
• Fungal
  • Candida spp.
  • Aspergillus spp.
  • Fusarium spp.

Epidemiology and Demographics

• In the United States, post-cataract endophthalmitis is the most common form of endophthalmitis.
• The incidence of post-cataract endophthalmitis was estimated to range from 80 to 360 cases per 100,00 individuals with ocular surgery.

Risk Factors

Exogenous endophthalmitis

Common risk factors in the development of post-catarct endophthalmitis include:

• Secondary intraocular lens placement
• Intra-ocular lenses (IOLs) with polypropylene
• Intracapsular cataract extraction
• Clear corneal incisions

Endogenous endophthalmitis

Common risk factors in the development of endogenous endophthalmitis include:

• Recent hospitalization
• Immunosuppression
• Diabetes mellitus

Screening

Screening for endophthalmitis is not recommended.

Natural History, Complications, and Prognosis

Natural History

Endophthalmitis is a medical emergency. If left untreated, It may lead to panophthalmitis, corneal infiltration, corneal perforation, and ultimately permanent vision loss.

Complications

Common complications of endophthalmitis include:

• Panophthalmitis
• Decrease or loss of vision
• Chronic pain
• Cataract development
• Retinal detachment
• Vitreous hemorrhage
• Hypotony and phthisis bulbi

Prognosis

Early diagnosis and treatment with antimicrobial therapy are fundamental to optimize visual outcome.

Diagnosis

Endophthalmitis is a clinical diagnosis, supported by culture of intra-ocular fluids.

Signs and symptoms

A history of recent intraocular surgery or penetrating ocular trauma is usually elicited. In some cases of metastatic endophthalmitis, the spread of infection may be hematogenous (via the blood-stream). That is more commonly seen in patients with immunocompromised states like AIDS and also in diabetes. The condition is usually accompanied by severe pain, loss of vision and redness of the conjunctiva and the underlying episclera. Alongside are present signs of inflammation of the various coats of the eye. Hypopyon can also be present in endophthalmitis and should be looked for on examination by a slit lamp. Progression to involve all the coats of the eye is called as panuveitis or panophthalmitis.

Slit lamp finding

• Hypopyon ( >80% of cases)
• Anterior chamber and vitreous inflammation
• Cloudy cornea
• Clumps of exudate in the anterior chamber (around the pupillary margin)
• Cloudy cornea
• Decreased red reflex

• 

  Anterior chamber inflammation, mild corneal edema, and hypopyon in bacterial endophthalmitis

• 

  Exogenous fungal endophthalmitis with corneal ulcer

• 

  Hypopyon

• 

  (A) Severe conjunctival injection, subconjunctival hemorrhage, corneal stromal edema, and hypopyon (B) Fundus photograph shows a mild pale color of optic disc & macular degeneration

• 

  Corneal edema and severe anterior chamber exudation

Laboratory Findings

Laboratory studies consistent with the diagnosis of post-cataract endophthalmitis include:

• Culture and gram stain of aqueous humor as well as the vitreous humor (not often sensitive)
• Polymerase chain reaction (PCR) of aqueous humor as well as the vitreous humor

Treatment

• The patient needs urgent examination by an expert ophthalmologist and/or vitreo-retina specialist who will usually decide for urgent intervention to provide intravitreal injection of potent antibiotics and also prepare for an urgent pars plana vitrectomy as needed. Enucleation may be required to remove a blind and painful eye.
• Endogenous endophthalmitis is caused by the hematologic dissemination of an infection to the eyes. Systemic antibiotics are recommended in endogenous bacterial endophthalmitis because the source of the infection is distant from the eye.
• Bacterial and fungal cultures from vitreous samples are necessary in the management of endophthalmitis
• Immediate vitrectomy is often necessary

Antimicrobial Regimens

• Infectious endophthalmitis

• 1. Causative pathogens

• Staphylococcus epidermidis
• Staphylococcus aureus
• Streptococci
• Enterococci
• Bacillus spp.
• Escherichia coli
• Neisseria meningitidis
• Klebsiella spp.
• Propionibacterium spp.
• Corynebacterium spp.
• Pseudomonas aeruginosa
• Candida spp.
• Aspergillus spp.
• Fusarium spp.

• 2. Empiric antimicrobial therapy

• Preferred regimen: Vancomycin 1 mg per 0.1 mL normal saline intravitreal injection, single dose AND Vancomycin 1 g IV bid for 2 weeks AND Ceftazidime 2.25 mg per 0.1 mL normal saline intravitreal injection, single dose AND Ceftazidime 1 g IV bid for 2 weeks AND Clindamycin 600-1200 mg IV bid to qid for 2 weeks
• Note (1): Re-injection should be considered if the infection does not improve beyond 48 hours of the first injection. Re-injection significantly increases the risk of retinal toxicity.
• Note (2): In addition to intravitreal and systemic antibiotic therapy, vitrectomy is usually necessary
• Note (3): Intravitreal and intravenous Amphotericin B may be added to the regimen if fungal endophthalmitis is suspected

• 3. Pathogen-directed antimicrobial therapy

• 3.1 Bacillus spp.

• Preferred regimen: Vancomycin 1 mg per 0.1 mL normal saline intravitreal injection, single dose AND Vancomycin 1 g IV bid for 2 weeks AND Clindamycin 600-1200 mg IV bid to qid for 2 weeks
• Note: In addition to antimicrobial therapy, vitrectomy is usually necessary

• 3.2 Non-Bacillus gram-positive bacteria

• Preferred regimen: Vancomycin 1 mg per 0.1 mL normal saline intravitreal injection, single dose AND Vancomycin 1 g IV bid for 2 weeks
• Note: In addition to antimicrobial therapy, vitrectomy is usually necessary

• 3.3 Gram-negative bacteria

• Preferred regimen: Ceftazidime 2.25 mg per 0.1 mL normal saline intravitreal injection, single dose AND Ceftazidime 1 g IV bid for 2 weeks
• Note: In addition to antimicrobial therapy, vitrectomy is usually necessary

• 3.4 Candida spp.

• Preferred regimen: (Fluconazole 400-800 mg IV/PO qd for 6-12 weeks OR Voriconazole 400 mg IV/PO bid for 2 doses followed by 200-300 mg IV/PO bid for 6-12 weeks OR Amphotericin B 0.7-1.0 mg/kg IV qd for 6-12 weeks) AND Amphotericin B 5-10 microgram in 0.1 mL in normal saline intravitreal injection, single dose
• Note (1): In addition to antimicrobial therapy, vitrectomy is usually necessary

• 3.5 Aspergillus spp.

• Preferred regimen: Amphotericin B 5-10 microgram in 0.1 mL normal saline intravitreal injection, single dose AND Dexamethasone 400 microgram intravitreal injection, single dose
• Note (1): In addition to antimicrobial therapy, vitrectomy is usually necessary
• Note (2): Repeat antimicrobial regimen in 2 days post-vitrectomy

• 4. Special Considerations

• 4.1 Endogenous endophthalmitis

• 4.1.1 Empiric antimicrobial therapy

• Preferred regimen: Vancomycin 1 mg per 0.1 mL normal saline intravitreal injection, single dose AND Vancomycin 1 g IV bid for 2 weeks AND Ceftazidime 2.25 mg per 0.1 mL normal saline intravitreal injection, single dose AND Ceftazidime 1 g IV bid for 2 weeks AND Clindamycin 600-1200 mg IV bid to qid for 2 weeks
• Note (1): Re-injection should be considered if the infection does not improve beyond 48 hours of the first injection. Re-injection significantly increases the risk of retinal toxicity.
• Note (2): In addition to intravitreal and systemic antibiotic therapy, vitrectomy is usually necessary::* Note (3): Intravitreal and intravenous Amphotericin B may be added to the regimen if fungal endophthalmitis is suspected

• 4.2 Bleb-related endophthalmitis

• 4.2.1 Empiric antimicrobial therapy

• Preferred regimen: Vancomycin 1 mg per 0.1 mL normal saline intravitreal injection, single dose AND Vancomycin 1 g IV bid for 2 weeks AND Ceftazidime 2.25 mg per 0.1 mL normal saline intravitreal injection, single dose AND Ceftazidime 1 g IV bid for 2 weeks AND Clindamycin 600-1200 mg IV bid to qid for 2 weeks
• Note (1): Re-injection should be considered if the infection does not improve beyond 48 hours of the first injection. Re-injection significantly increases the risk of retinal toxicity.
• Note (2): In addition to intravitreal and systemic antibiotic therapy, vitrectomy is usually necessary

• 4.3 Post-operative endophthalmitis

• 4.3.1 Empiric antimicrobial therapy

• Preferred regimen: Vancomycin 1 mg per 0.1 mL normal saline intravitreal injection, single dose AND Ceftazidime 2.25 mg per 0.1 mL normal saline intravitreal injection, single dose
• Note (1): In addition to intravitreal antibiotic therapy, vitrectomy is necessary
• Note (2): If there is no improvement in 48 h, a repeat intravitreal injection may be administered
• Note (3): Late post-operative endophthalmitis is often caused by Propionibacterium acnes (several years post-op)

• 4.3.2 Pathogen-directed antimicrobial therapy

• 4.3.2.1 Gram-positive bacteria

• Preferred regimen: Vancomycin 1 mg per 0.1 mL normal saline intravitreal injection, single dose

• 4.3.2.2 Gram-negative bacteria

• Preferred regimen: Amikacin 0.4 mg per 0.1 mL normal saline intravitreal injection, single dose
• Note: Intravitreal amikacin is associated with the development of retinal microvasculitis

• 4.4 Post-traumatic endophthalmitis

• 4.4.1 Empiric antimicrobial therapy

• Preferred regimen: Vancomycin 1 mg per 0.1 mL normal saline intravitreal injection, single dose AND Ceftazidime 2.25 mg per 0.1 mL normal saline intravitreal injection, single dose AND Amphotericin B 5-10 microgram in 0.1 mL in normal saline intravitreal injection, single dose
• Note (1): Removal of foreign bodies and debridement of necrotic tissue is necessary
• Note (2): In addition to antimicrobial therapy, vitrectomy is necessary
• Note (3): Systemic broad spectrum antibiotics are recommended in post-traumatic endophthalmitis

Surgery

Vitrectomy

Vitrectomy surgically debrides the vitreous humor, similarly to draining an abscess, and is the fastest way of clearing infection in eyes with fulminant endophthalmitis.

Prevention

Primary prevention

Common effective measures for the primary prevention of endophthalmitis include:

• Proper sterile preparation of the surgical site
• Sterile preparation of the skin surrounding the surgical eye with Povidone-Iodine 10%
• Povidone-Iodine 5% onto the ocular surface (3-5 minutes prior to surgery)
• Removal of foreign bodies and debridement of necrotic tissue after penetrating eye injury
• Intracameral or intravitreal antibiotic injection after penetrating eye injury
• Effective treatment of underlying medical conditions

Secondary prevention

There are no secondary preventive measures available for post-operative endophthalmiatis endophthalmiatis is a medical emergency.

External links

• Peters JR. "Endophthalmitis." eMedicine.com. Accessed September 28, 2006.
• Wu L. "Endophthalmitis, Fungal." eMedicine.com. Accessed September 28, 2006.