In which of the following diseases would a patient experience a pseudomembrane covering the tonsils, pharynx, and larynx?
a. Tuberculoid leprosy
b. Diphtheria
c. Arrhythmia
d. Tetanus

Verified step by step guidance

Step 1: Understand the term 'pseudomembrane' — it refers to a false membrane composed of dead cells, fibrin, bacteria, and inflammatory cells that can cover mucous membranes during certain infections.

Step 2: Review the diseases listed and their typical clinical features: Tuberculoid leprosy primarily affects the skin and peripheral nerves; arrhythmia is a heart rhythm disorder and not an infectious disease; tetanus causes muscle spasms due to a neurotoxin but does not produce pseudomembranes.

Step 3: Focus on diphtheria, which is caused by Corynebacterium diphtheriae. This bacterium produces a toxin that leads to the formation of a thick, gray pseudomembrane on the tonsils, pharynx, and larynx.

Step 4: Recall that the pseudomembrane in diphtheria can cause airway obstruction and is a hallmark sign used in diagnosis.

Step 5: Conclude that among the options, diphtheria is the disease associated with a pseudomembrane covering the tonsils, pharynx, and larynx.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Pseudomembrane Formation

A pseudomembrane is a layer of dead cells, fibrin, and inflammatory debris that forms on mucous membranes during certain infections. It often appears as a thick, grayish coating that can obstruct airways, commonly seen in diseases like diphtheria.

Diphtheria Pathogenesis

Diphtheria is caused by Corynebacterium diphtheriae, which produces a toxin leading to local tissue damage and pseudomembrane formation in the throat. This membrane can cover the tonsils, pharynx, and larynx, causing breathing difficulties and systemic toxicity.

Differential Diagnosis of Infectious Diseases

Understanding symptoms and signs helps differentiate diseases. Tuberculoid leprosy affects skin and nerves, arrhythmia is a heart rhythm disorder, and tetanus causes muscle spasms. Only diphtheria is associated with pseudomembrane formation in the respiratory tract.

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