A patient has a new plaster of Paris cast applied to their lower leg. Which nursing action is most appropriate to promote cast drying and prevent complications?

Appeared in: SCTIMST Staff Nurse - 2015 (Set-A)

Explanation

A wet plaster cast is soft and can be easily indented.
Handling the cast with the palms of the hands distributes pressure evenly, preventing the formation of indentations.
Preventing indentations is crucial because they can create pressure points on the underlying skin, leading to pressure ulcers and impaired circulation once the cast hardens.
This technique maintains the smooth, uniform shape of the cast, ensuring it provides support without causing harm.

Option A: Covering a wet cast with a heavy blanket traps moisture and heat, which prevents air circulation and significantly delays the drying process. This can result in a weak, malodorous cast and skin maceration.
Option B: Using a hairdryer, especially on a high-heat setting, causes the exterior of the cast to dry too quickly while the interior remains wet. This 'case hardening' results in a weak cast. The high heat also creates a serious risk of thermal injury or burns to the patient's skin.
Option D: Placing a cast on a plastic-covered surface traps heat and moisture, preventing air from circulating around the cast. This inhibits drying. A cloth-covered pillow is recommended as it allows for air circulation and can absorb moisture.

Clinical Relevance

Nursing practice connection: Use the key finding related to Proper nursing care and handling of a new plaster of Paris cast to promote drying and prevent complications to guide bedside assessment, documentation, and the next nursing action.
Preventing pressure ulcers is a fundamental patient safety goal. Improper cast handling is a direct cause of iatrogenic pressure injuries, which are considered a 'never event' in many healthcare systems.
Nurses play a key role in educating patients and families on proper cast care at home, including not getting it wet, not inserting objects inside, and recognizing signs of complications.
What if the cast was made of fiberglass instead of plaster? Fiberglass casts are lighter, more durable, and dry much faster (within 30 minutes). While they are also susceptible to pressure from indentations when wet, the window of risk is much shorter. The principles of neurovascular assessment and elevation remain the same.

How to Approach the Question

First, identify the key elements of the question: 'new plaster of Paris cast' and 'promote drying and prevent complications'. This tells you the cast is wet and the goal is safe and effective care.
Analyze each option based on basic principles of physics and physiology. Consider how each action affects air circulation, heat transfer, and pressure distribution.
Option A (blanket): Blankets trap heat and moisture. This would hinder drying. Eliminate.
Option B (hairdryer): Concentrated high heat is dangerous (burns) and causes uneven drying. Eliminate.
Option D (plastic pillow): Plastic is non-porous and traps moisture, preventing air circulation. This would hinder drying. Eliminate.
Option C (palms of hands): This addresses the malleability of a wet cast. Using palms distributes pressure, preventing dents that could cause pressure sores. This is a classic nursing principle for cast care. Select this as the correct answer.

Concept Tested & Keywords

Concept Tested: Proper nursing care and handling of a new plaster of Paris cast to promote drying and prevent complications.
Stem keywords: plaster of Paris cast, lower leg, nursing action, cast drying
Lead-in keywords: most appropriate
Clinical cues: The cue 'new plaster of Paris cast' indicates the cast is wet and malleable, making handling technique critical.

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E6 Nursing Brunner Adult Health 3SA Vol 1 Part 4 pp. 117-119, 122-124

Practise the full SCTIMST Staff Nurse - 2015 (Set-A)

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