A female client was horseback riding when her horse slipped and fell on her leg, crushing but not breaking it, and resulting in a large amount of edema over the crushed area. Which pathophysiological mechanism is responsible for the edema?
Increase in interstitial osmotic pressure due to cellular damage.
Decrease in interstitial pressures due to low blood pressure.
Increased intravascular osmotic pressure due to crushing injury.
Increased intravascular hydrostatic pressure due to trauma.
The Correct Answer is A
A. Increase in interstitial osmotic pressure due to cellular damage. A crushing injury damages cells, leading to the release of intracellular proteins and solutes into the interstitial space. This increases interstitial osmotic pressure, drawing fluid from the blood vessels into the injured tissues, causing edema. The inflammatory response further contributes to capillary permeability and fluid leakage.
B. Decrease in interstitial pressures due to low blood pressure. Blood pressure does not directly regulate interstitial pressure in a localized trauma area. Even if systemic blood pressure were low, localized edema can still occur due to tissue damage and increased capillary permeability.
C. Increased intravascular osmotic pressure due to crushing injury. Osmotic pressure in the blood is primarily determined by plasma proteins, such as albumin. A crushing injury does not increase intravascular osmotic pressure; instead, it increases interstitial osmotic pressure, pulling fluid out of the blood vessels.
D. Increased intravascular hydrostatic pressure due to trauma. While trauma can cause localized vascular changes, hydrostatic pressure primarily affects systemic circulation. In this case, localized tissue damage and inflammation—not increased intravascular pressure—are responsible for edema formation.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["B","D","E"]
Explanation
A. Explain that the child is likely to grow into her weight. This is incorrect because a BMI at the 85th percentile indicates that the child is overweight. Without intervention, the risk of continued excess weight gain and future obesity increases.
B. Obtain the child's 3-day diet history based on the mother's input. Assessing the child's dietary habits helps identify potential areas for improvement, such as reducing sugary drinks or increasing fruit and vegetable intake. Understanding the child’s nutrition is essential for developing a healthy eating plan.
C. Tell the mother that girls hit their growth spurt before boys so eating more is expected. While girls do experience growth spurts earlier than boys, this does not justify excessive weight gain. Encouraging healthy eating and physical activity is more appropriate than assuming the child will "grow out of it."
D. Inquire as to whether or not the school has a physical education program. School-based physical activity plays an important role in weight management. If the school lacks a structured program, additional strategies for physical activity should be explored.
E. Determine the child's usual physical activity pattern. Assessing the child’s activity level helps identify if sedentary behaviors (e.g., excessive screen time) are contributing to weight gain. Encouraging regular physical activity is a key part of managing childhood obesity.
Correct Answer is ["B","E","F"]
Explanation
A. Serum blood glucose 185 mg/dL (10.2 mmol/L) (Incorrect): Although lower than the previous reading, it is still elevated, which can impair healing and increase the risk of infection recurrence.
B. Temperature 98.8°F (37.1°C) (Therapeutic Response): A return to a normal temperature indicates resolution of systemic infection. Fever is a sign of active infection, so its absence suggests improvement.
C. White blood cell count 11.2 x 10³/μL (11.2 x 10⁹/L) (Incorrect): This is slightly elevated, which may indicate residual inflammation or infection. A further decrease would be expected for full resolution.
D. Capillary refill greater than 3 seconds bilateral lower extremities (Incorrect): Delayed capillary refill suggests impaired circulation, which is not an indicator of a fully therapeutic response.
E. Bilateral lower extremities skin warm, dry, and pink (Therapeutic Response): Improved skin condition suggests reduced inflammation, better circulation, and healing of the cellulitis-affected area.
F. Pain 2 on a 0 to 10 pain scale, bilateral lower legs described as neuropathic (Therapeutic Response): Pain related to cellulitis typically improves with treatment. If the remaining pain is neuropathic, it suggests resolution of the acute infection.
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