Ophthalmia Neonatorum
Definition And Epidemiology
- Conjunctivitis occurring within first four weeks after birth.
- Represents most common eye disease of newborns.
- Typically acquired during vaginal delivery.
- Reflects sexually transmitted infections prevalent in community.
- Chlamydia trachomatis represents most common causative organism in United States.
Etiology And Incubation
- Clinical overlap exists among different causes.
- Infection may be present at birth following prolonged membrane rupture.
- Contaminated adult fingers represent alternative inoculation route.
| Etiologic Agent | Incubation Period | Characteristics |
|---|---|---|
| Chemical (Silver nitrate) | 6-12 hours | Mild self-limited chemical conjunctivitis clearing by 24-48 hours. |
| Neisseria gonorrhoeae | 2-5 days | Incubation potentially delayed beyond 5 days due to partial prophylaxis suppression. |
| Chlamydia trachomatis | 5-14 days | Topical prophylaxis ineffective for subsequent chlamydial pneumonia prevention. |
Clinical Manifestations
- Redness and chemosis of conjunctiva.
- Edema involving eyelids.
- Purulent or mucopurulent discharge.
- Neisseria gonorrhoeae and Pseudomonas carry severe risk for corneal perforation, blindness, and death.
Diagnosis
- Purulent discharge requires Gram stain evaluation.
- Polymerase chain reaction testing recommended for gonococcus and suspected viral causes.
- Diagnosis of chlamydial conjunctivitis relies on chlamydial antigen or deoxyribonucleic acid testing.
- Differential diagnosis includes dacryocystitis secondary to congenital nasolacrimal duct obstruction.
Management
- Requires prompt systemic and ocular evaluation.
- General supportive measures include clean water cleansing, lubricating eyedrops, and cold compresses.
| Pathogen | Specific Treatment Protocol |
|---|---|
| Suspected Gonococcal | Single dose ceftriaxone 25-50 mg/kg Intravenous or Intramuscular (maximum 125 mg). |
| Confirmed Gonococcal | Frequent saline irrigation every 10-30 minutes, increasing to 2-hour intervals until discharge clears. |
| Chlamydia trachomatis | Oral erythromycin 50 mg/kg/day divided into four doses for 2 weeks to cure conjunctivitis and prevent pneumonia. |
| Pseudomonas | Systemic aminoglycoside, local saline irrigation, and gentamicin ophthalmic ointment. |
| Staphylococcus aureus | Parenteral methicillin and local saline irrigation. |
Prophylaxis And Prevention
- Prophylaxis relies on instillation of 0.5% erythromycin or 1% silver nitrate drops directly into open eyes at birth.
- Povidone-iodine 2% solution serves as effective prophylactic alternative.
- Incidence successfully reduced by prenatal screening and maternal gonorrhea treatment.
- Infants born to mothers with untreated gonococcal infection require single dose ceftriaxone 50 mg/kg (maximum 125 mg) alongside topical prophylaxis.