Diaper rashes most commonly caused by?

RUHS, Jaipur, M.Sc Nursing Entrance Exam-2018

Child Health Nursing (Pediatrics)

Easy

Appeared in: RUHS, Jaipur, M.Sc Nursing Entrance Exam-2018

Explanation

The most common type of diaper rash is irritant contact dermatitis, caused by prolonged contact with urine and feces.
E. coli, a bacterium abundant in feces, produces the enzyme urease.
Urease breaks down urea from urine into ammonia, which raises the skin's pH.
This elevated pH activates fecal proteases and lipases, enzymes that damage the skin barrier, leading to inflammation and rash.
Therefore, E. coli is the key organism initiating the chemical cascade that results in the most common form of diaper rash.

Option A: Diphtheria is a serious bacterial infection caused by Corynebacterium diphtheriae. It primarily affects the mucous membranes of the nose and throat. While a rare skin form (cutaneous diphtheria) exists, it is not a cause of common diaper rash.
Option C: Staphylococcus aureus can cause a secondary bacterial infection on top of an existing diaper rash, often presenting as pustules, bullae (blisters), or honey-colored crusts (impetigo). It is not the primary cause of the most common irritant-type diaper rash.
Option D: Streptococcus (specifically Group A Streptococcus) causes a distinct condition called perianal streptococcal dermatitis. This presents as a bright red, sharply demarcated rash around the anus. It is a specific infection, not the cause of general, widespread irritant diaper rash.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Etiology of Diaper Dermatitis as background academic context rather than a clinical decision trigger.
Nurses play a crucial role in educating parents on preventing diaper rash through proper hygiene, including frequent diaper changes, gentle cleaning, and the application of barrier creams.
It is vital for nurses to differentiate between simple irritant dermatitis and rashes with secondary infections (like Candida or bacteria), as the treatment differs significantly (e.g., requiring antifungals or antibiotics).
Recognizing the signs of a secondary infection, such as beefy-red plaques, satellite lesions (Candida), or pustules (bacteria), is a key nursing assessment skill that prompts appropriate medical referral.

How to Approach the Question

First, identify the keywords in the question: 'Diaper rashes' and 'most commonly caused by'. This indicates you need to identify the primary etiology of the most frequent type of diaper rash.
Recall the different types of diaper dermatitis. The most common is irritant contact dermatitis, followed by candidal and bacterial infections.
Analyze the mechanism of irritant dermatitis: it's a chemical irritation from the interaction of urine and feces.
Connect this mechanism to the options. Feces contain bacteria. E. coli is a major component of gut flora found in feces.
Evaluate the role of E. coli: it produces urease, which breaks down urea in urine to ammonia, raising skin pH and activating skin-damaging enzymes. This directly links E. coli to the cause of irritant dermatitis.
Eliminate the other options: Staphylococcus and Streptococcus cause less common bacterial infections, and Diphtheria is unrelated.

Concept Tested & Keywords

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E6 Nelson Textbook of Pediatrics(2024) — Volume 2 pp. 1898-1900, 1899-1901

E6 Midwifery Obstetrics and Gynecology Nursing Sandeep Kaur p. 24-32