Post-traumatic endophthalmitis

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

Overview

Post-traumatic bacterial endophthalmitis occurs following penetrating ocular injuries. Post-traumatic endophthalmitis associated with a greater variety of organisms. The most common isolated organisms include Gram-positive Staphylococcus epidermidis and Streptococcus (as a part of the normal skin flora and regularly contaminate open wounds). Bacillus cereus is ranked second and some cases are polymicrobial.The risk for developing endophthalmitis after open globe injuries is estimated at about 7%

Classification

Post-traumatic enophthalmitis may be classified according to causative organisms into 2 subtypes: bacterial or fungal.

Pathophysiology

Pathogenesis

Post-traumatic 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 ocular surgery. The broad prevalence range is due to factors such as:

• Presence of an intraocular foreign body
• Delay primary globe repair
• Location and extent of laceration of the globe

Post-traumatic endophthalmitis associated with a greater variety of organisms. The most common isolated organisms include Gram-positive Staphylococcus epidermidis and Streptococcus (as a part of the normal skin flora and regularly contaminate open wounds). Bacillus cereus is ranked second and some cases are polymicrobial.

Gross Pathology

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

Causes

Post-traumatic bacterial endophthalmitis

Common causes of post-traumatic bacterial endophthalmitis include:

• Gram-positive bacteria
  • Staphylococcus species
  • Streptococcus species
  • Bacillus cereus (most common in the setting of an IOFB or soil contamination)
  • Clostridium (fulminant endophthalmitis)
  • Propionibacterium acnes
• Gram-negative bacteria
  • Klebsiella
  • Pseudomonas (fulminant endophthalmitis)
• Polymicrobial

Post-traumatic fungal endophthalmitis

Common causes of post-traumatic fungal endophthalmitis include:

• Candida species
• Aspergillus species
• Paecilomyces species
• Fusarium species
• Dematacious fungi

Differentiating Post-traumatic Endophthalmitis from Other Diseases

Post-traumatic endophthalmitis must be differentiated from:

• Post-traumatic non-infectious inflammation
• Phacoanaphylactic endophthalmitis
• Keratitis
• Uveitis

Epidemiology and Demographics

The incidence of traumatic endophthalmitis may be decreasing due to earlier wound closure and prompt initiation of antibiotics. Post-traumatic endophthalmitis accounts for 25,000 to 31,000 cases per 100,000 individuals with endophthalmitis.

Prevalence and Incidence

• The incidence of post-traumatic endophthalmitis was estimated to range from 3.300 to 30,000 per 100,000 individuals with penetrating ocular trauma.
• The incidence of post-traumatic endophthalmitis was estimated to range from 1,300 to 61,000 per 100,000 individuals with intraocular foreign body.
• Post-traumatic endophthalmitis accounts for 25,000 to 31,000 cases per 100,000 individuals with endophthalmitis.

Risk Factors

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

• Retained intraocular foreign bodies
  • Non-metallic intraocular foreign body (IOFB)
• Injury in a rural setting
• Delay in repair more than 24 hours
• Disruption of the lens
• Ocular tissue prolapse
• Large wound size

Screening

Screening for post-traumatic endophthalmitis is not recommended after open globe injuries.

There is insufficient evidence to recommend routine aqueous culture in all cases of open globe injury.

Natural History, Complications, and Prognosis

Natural History

Post-traumatic endophthalmitis may occur within hours after the trauma or up to several weeks after injury. Symptoms include decreased vision, pain greater than expected, and lid swelling. Post-traumatic 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 post-traumatic endophthalmitis include:

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

Prognosis

Post-traumatic bacterial endophthalmitis is associated with particularly very poor visual outcome. Only 22% to 42% patients with post-traumatic bacterial endophthalmitis obtain a final visual acuity of 20/400 or better.

Diagnosis

History

• A recent history of penetrating ocular trauma

Symptoms

Symptoms of post-traumatic bacterial endophthalmitis may include the following:

• Decreased vision
• Pain greater than expected
• Lid swelling
• Photophobia
• Tearing

Eye Examination

Ophthalmologic examination of patients with post-traumatic endophthalmitis is usually remarkable for:

• Conjunctival injection
• Chemosis
• Purulent discharge
• Lid edema
• Periorbital erythema
• Proptosis

Laboratory Findings

Laboratory studies consistent with the diagnosis of post-traumatic 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 (much more sensitive than culture (70% vs. 9%))

Imaging Findings

X Ray

Plain film x ray is helpful for the detection of intra ocular foreign bodies (IOFBs) igiven the low cost and ease of interpretation. However, it may detection of only about 40% of intra ocular foreign bodies (IOFBs).

CT

Orbital CT scan is helpful for localization of metallic intra ocular foreign bodies (IOFBs) in the setting of trauma.

MRI

Orbital MRI scan is helpful for localization of intra ocular foreign bodies (IOFBs) that may be radiolucent on CT in the setting of trauma. However, metallic IOFB must be excluded first.

Ultrasound

On ocular ultrasonography, endophthalmitis may characterized by anterior vitreous haze echoes and retinochoroidal thickening.

Other Imaging Findings

Orbital echography is helpful for assessment of vitreous opacification, presence of (IOFBs), status of the posterior hyaloid face, and retinal detachment in a patient with either post-traumatic endophthalmitis.

Other Diagnostic Studies

Slit lamp examination

On slit lamp examination, post-traumatic endophthalmitis is characterized by:

• Hypopyon
• Mild to moderate anterior chamber reaction
• Hypopyon
• Vitritis
• Corneal ring infiltrate
• Clumps of thick white material in the anterior chamber (fungal endophthalmitis)
• Filaments extending from the back of the cornea into the aqueous humor (fungal endophthalmitis)

Treatment

Medical Therapy

• 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.
• Closure of the wound is the first step in management of open glob injury
• Removal of intraocular foreign bodies (IOFB) and debridement of necrotic tissue is necessary
• Bacterial and fungal cultures from vitreous samples are necessary
• Vitrectomy is often indicated
• Immunization against tetanus based on history is necessary
• Systemic broad spectrum antibiotics are recommended
• Systemic antifungal agents are recommended in patients with suspected fungal endophthalmitis

Antimicrobial Regimens

• Infectious endophthalmitis

• 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

• 2. Pathogen-directed antimicrobial therapy

• 2.1 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

• 2.2 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

• 2.3 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

• 2.4 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

• 2.5 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

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.

• Vitrectomy is recommended for all patients who develop exogenous bacterial endophthalmitis.
• Vitrectomy is recommended in severe cases of endogenous bacterial endophthalmitis.

The benefits of vitrectomy include:

• Better vitreous sample
• Rapid and complete sterilization of the vitreous
• Removal of toxic bacterial products
• Enhancement of systemic antimicrobial penetration in to the eye

Prevention

Primary prevention

Effective measures for the primary prevention of post-traumatic endophthalmitis include:

• Primary globe repair within 24 h
• Removal of foreign bodies and debridement of necrotic tissue
• Intracameral or intravitreal antibiotic injection after penetrating eye injury
• Systemic

Secondary prevention

There are no secondary preventive measures available for posttraumaic endophthalmiatis. Endophthalmiatis is a medical emergency.

References

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