A36.2 Laryngeal diphtheria

Name of the Condition

• Laryngeal diphtheria

Summary

Laryngeal diphtheria is a localized form of diphtheria affecting the larynx. It is caused by Corynebacterium diphtheriae and is characterized by the formation of a thick, adherent pseudomembrane in the laryngeal region. The infection may also produce a potent exotoxin that can lead to systemic complications, even if the primary site is limited to the larynx.

Causes

Laryngeal diphtheria is caused by infection with Corynebacterium diphtheriae, a gram-positive bacterium. The disease spreads through respiratory droplets or direct contact with an infected person’s respiratory secretions. The exotoxin produced by the bacteria is responsible for tissue damage and potential systemic effects.

Risk Factors

• Lack of vaccination or incomplete immunization against diphtheria.
• Close contact with an infected individual.
• Poor hygiene or crowded living conditions.
• Travel to regions with low vaccination coverage.

Symptoms

• Hoarseness or loss of voice.
• Difficulty breathing or stridor.
• Cough (often described as "barking" or "seal-like").
• Thick, grayish-white pseudomembrane in the larynx.
• Fever and chills.
• Swollen cervical lymph nodes (bull neck appearance).
• Respiratory distress in severe cases.

Diagnosis

Diagnosis involves clinical assessment of symptoms, particularly the presence of the characteristic pseudomembrane in the larynx. Laboratory tests, including throat cultures or PCR, confirm the presence of Corynebacterium diphtheriae. Toxin detection may also be performed to assess the risk of systemic complications.

Treatment Options

Treatment typically includes administration of diphtheria antitoxin to neutralize the toxin, along with antibiotics such as penicillin or erythromycin to eliminate the bacteria. Supportive care, including airway management, may be necessary in severe cases. Vaccination is recommended for prevention.

Prognosis and Follow-Up

Prognosis depends on the severity of the infection and timely treatment. Early intervention improves outcomes, but complications such as airway obstruction or myocarditis can occur. Follow-up care includes monitoring for recurrence and ensuring completion of the diphtheria vaccination series.

Complications

• Airway obstruction due to pseudomembrane formation.
• Myocarditis (inflammation of the heart muscle).
• Neurological complications, such as paralysis.
• Respiratory failure in severe cases.

Lifestyle & Prevention

• Ensure up-to-date vaccination with the diphtheria toxoid-containing vaccine.
• Practice good hygiene, including handwashing.
• Avoid close contact with infected individuals.
• Seek medical care promptly if symptoms of respiratory infection occur.

When to Seek Professional Help

Seek immediate medical attention if you experience severe respiratory distress, difficulty breathing, or a barking cough, especially if you have been exposed to diphtheria or have not been vaccinated.

Tips for Medical Coders

When coding for laryngeal diphtheria, use the ICD-10-CM code A36.2. Ensure documentation supports the diagnosis, including clinical findings (e.g., pseudomembrane in the larynx) and any associated complications. Verify that the code aligns with the specific anatomical site and clinical presentation.