Frostbite occurs when a body part or skin comes into contact with ______.

Appeared in: Raj. CHO - 2023

Explanation

Frostbite is, by definition, tissue damage resulting from freezing due to severe environmental cold exposure or direct contact with a very cold object.
The injury occurs at or below freezing temperatures (0°C or 32°F).
The pathophysiology involves the formation of ice crystals in the tissue and severe vasoconstriction, which cuts off blood flow and leads to cellular death.

Option B: A metal injury refers to physical trauma like a cut or puncture. While contact with very cold metal can cause frostbite, 'metal injury' itself describes the trauma, not the freezing process.
Option C: Insect venom causes a toxicological or allergic reaction, leading to inflammation and swelling. This is a chemical injury, completely different from the thermal injury of frostbite.
Option D: Excessive heat causes thermal burns, which is the opposite of frostbite. Burns are tissue damage from high temperatures, whereas frostbite is tissue damage from freezing temperatures.

Visual 1: Diagram - The four degrees of frostbite, illustrating the progression from superficial redness (first degree) to deep tissue necrosis involving muscle and bone (fourth degree).
Visual 2: Infographic - First aid for frostbite, showing the 'Do's' (e.g., gentle rewarming in warm water) and 'Don'ts' (e.g., no rubbing, no dry heat).

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Definition and cause of frostbite as background academic context rather than a clinical decision trigger.
Nurses must be able to quickly identify frostbite and differentiate it from non-freezing cold injuries like chilblains or trench foot to initiate appropriate care.
A key nursing intervention is pain management, as the rewarming process can be extremely painful for the patient.
Patient education on prevention is critical, especially for high-risk groups like the elderly, children, individuals with peripheral vascular disease, and those working outdoors in cold climates.

How to Approach the Question

First, identify the core concept in the question stem. The question asks for the direct cause of 'frostbite'.
Recall the medical definition of frostbite. It is a specific term for tissue injury caused by the freezing of tissues.
Evaluate each option based on this definition. 'Freezing cold temperatures' is the only option that directly aligns with the mechanism of frostbite.
Systematically eliminate the other options by identifying their distinct mechanisms: 'metal injury' is trauma, 'insect venom' is a toxicological reaction, and 'excessive heat' causes burns, the opposite of frostbite.

Concept Tested & Keywords

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Practise the full Raj. CHO - 2023

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