In which type of burn are the epidermis and the entire dermis destroyed?

Appeared in: NHM UP Staff Nurse-2023 shift 1st

Explanation

Third-degree burns, also known as full-thickness burns, are characterized by the destruction of the entire epidermis and the full depth of the dermis.
This level of injury extends into the subcutaneous tissue, destroying structures housed within the dermis, such as hair follicles, sweat glands, and nerve endings.
Due to the destruction of nerve endings, the burn site itself is typically insensate (painless), though the less-damaged edges may still be painful.
The appearance of a third-degree burn is often white, leathery, or charred, and it does not blanch with pressure.

Option A: Second-degree burns (partial-thickness) involve the epidermis and only a portion of the dermis, not the entire dermis.
Option B: Fourth-degree burns extend beyond the dermis into deeper structures like fascia, muscle, and bone. While they destroy the epidermis and dermis, the definition specifies injury that goes even deeper.
Option D: First-degree burns are superficial and only involve the outermost layer of the skin, the epidermis.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Classification of burns by depth of tissue injury as background academic context rather than a clinical decision trigger.
Accurate assessment of burn depth is critical for guiding treatment, including fluid resuscitation needs, wound care strategies (e.g., dressings, grafting), and pain management.
A key nursing assessment point is sensation. A very painful, blistered burn is likely second-degree, whereas a painless, leathery wound suggests a third-degree burn, indicating nerve destruction.
Full-thickness (third-degree) burns carry a high risk of infection and require specialized care, often including surgical excision and skin grafting, as the skin cannot regenerate on its own.

How to Approach the Question

First, identify the key terms in the question: 'epidermis' and 'entire dermis destroyed'. This points to a question about the depth of tissue injury.
Recall the layers of the skin (epidermis, dermis, subcutaneous tissue) and how they relate to burn classifications.
Systematically review the definitions for each degree of burn.
Match the description in the question ('entire dermis destroyed') to the correct classification. A first-degree burn is too superficial, a second-degree burn is not deep enough, and a fourth-degree burn is too deep.
Conclude that a third-degree (full-thickness) burn is the only classification that precisely matches the destruction of the epidermis and the entire dermis.

Concept Tested & Keywords

QTIxiWwe6AO3pOy6hiZiq-

E6 Pathology- ROBBINS & COTRAN PATHOLOGIC BASIS OF DISEASE 10TH Ed p. 433-435

E6 Nelson Textbook of Pediatrics(2024) — Volume 1 p. 693-695

Practise the full NHM UP Staff Nurse-2023 shift 1st

Attempt every question from this paper in a timed mock, then review the full solution for each one.