# A 7-year-old child with a newly applied long leg cast for a femur fracture is being monitored in the pediatric unit. Which assessment finding would require the nurse to take immediate action?

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> subject: Adult Health

## 문제

A 7-year-old child with a newly applied long leg cast for a femur fracture is being monitored in the pediatric unit. Which assessment finding would require the nurse to take immediate action?

## 보기

1. The child complains of mild pain at the fracture site that is relieved with prescribed analgesics
2. The cast feels warm to touch and has a musty odor after 24 hours
3. The child's toes are pale, cool, and capillary refill is 4 seconds with numbness reported **✔ 정답**
4. Small amounts of bloody drainage are visible on the cast near the fracture site

**정답: 3**

## 해설

Pale, cool toes with delayed capillary refill and numbness indicate compromised circulation, a medical emergency requiring immediate intervention to prevent permanent damage. Other options represent expected or less urgent findings manageable with standard care.

## 심화 해설

Understanding the Priority: Neurovascular Compromise

For a child in a long leg cast following a femur fracture, the highest priority assessment is always neurovascular status. The mnemonic "The 5 P's" is critical here: Pain, Pallor, Pulselessness, Paresthesia (numbness/tingling), and Paralysis. These signs indicate acute compartment syndrome (ACS), a limb-threatening emergency where increased pressure within a closed fascial space compromises circulation and tissue perfusion. The rigid cast itself can act as a non-yielding envelope, contributing to this pressure buildup. The findings in option 3—pale, cool toes, a capillary refill of 4 seconds (normal is less than 2-3 seconds), and numbness—are classic late signs of arterial insufficiency and nerve ischemia. This requires immediate action, specifically notifying the healthcare provider and preparing for possible cast bivalving or fasciotomy to relieve pressure. While the provided research focuses on specific fixation methods like light-cured polymers and elastic nails, the fundamental principle of monitoring for vascular compromise post-immobilization remains universally paramount. One study on light-cured polymer immobilization explicitly lists documenting "skin- and device-related events" as a key objective, which directly encompasses the vigilance needed to detect circulatory impairment early [1].

Analysis of Incorrect Options

-   Option 1: Mild pain that is relieved by medication is an expected finding. While unrelenting pain, especially pain disproportionate to the injury and unresponsive to analgesics, is a hallmark early sign of ACS, pain that is controlled is a positive indicator and does not require immediate action.

-   Option 2: A cast that feels warm and has a musty odor after 24 hours is an expected finding related to the normal drying and curing process of the casting material. This is not a sign of infection, which would present with a foul odor, purulent drainage, and possibly systemic signs like fever, typically developing over a longer period.

-   Option 4: A small amount of bloody drainage on the cast near the fracture site can be an expected finding post-injury and application, especially with a fresh fracture. The nurse should circle the area, note the time and date, and monitor for expansion, which would indicate active bleeding. This requires monitoring but is not the immediate, life-or-limb-threatening priority that neurovascular compromise represents. The focus on complications in the provided literature, such as vascular injury and compartment syndrome following knee osteotomies, reinforces that circulatory assessment takes precedence over wound drainage in the acute post-procedural phase .References (research sources)

- [1]Radiographic Healing and Observed Complications Following Light-Cured Polymer Immobilization: A Retrospective Cohort Study of 108 Patients.Research articleReyes Martínez O, Stavitz J, Olmeda-Mercado K, Negrón-Rodríguez V, Porcelli R. (2026) · DOI: 10.3390/jcm15103709

## 임상 시나리오

Neurovascular Assessment in Cast CareDetecting Acute Compartment Syndrome
Following cast application, prioritize assessment of the 5 P's: Pain, Pallor, Pulselessness, Paresthesia, and Paralysis. These are hallmarks of acute compartment syndrome (ACS), a limb-threatening emergency.

Immediate action is required for findings like pale, cool skin, capillary refill greater than 3 seconds, and patient reports of numbness or tingling. These indicate arterial insufficiency and nerve ischemia.

CautionDo not wait for pulselessness, a late sign. Pain unrelieved by medication and out of proportion to the injury is a critical early indicator. Prepare for immediate cast bivalving and notify the provider.

## 핵심 개념

- **Acute Compartment Syndrome (ACS)** — A limb-threatening condition where increased pressure within a closed fascial space compromises circulation and tissue perfusion, often triggered by a rigid cast.
- **The 5 P's** — A mnemonic for neurovascular assessment: Pain, Pallor, Pulselessness, Paresthesia (numbness/tingling), and Paralysis, indicating potential ACS.
- **Capillary Refill Time** — The time taken for color to return to an external capillary bed after pressure is applied; a normal value is less than 2-3 seconds.
- **Cast Bivalving** — An emergency procedure where a cast is cut on both sides to relieve pressure and restore circulation in cases of neurovascular compromise.

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