Immobility due to prolonged bed rest may cause?

SGPGI Nursing Officer-2022

Medical Surgical Nursing

Easy

Appeared in: SGPGI Nursing Officer-2022

Explanation

Prolonged immobility leads to venous stasis, which is the pooling of blood in the veins of the lower extremities due to lack of muscle activity.
Venous stasis is a primary component of Virchow's triad, the three factors that promote the formation of a thrombus (blood clot).
The other two factors of Virchow's triad are hypercoagulability (increased blood clotting) and endothelial injury (damage to the vein wall), both of which can be present in an ill, immobilized patient.
The combination of these factors, especially venous stasis, significantly increases the risk of developing a Deep Vein Thrombosis (DVT).

Option A: Immobility causes the opposite condition. Lack of weight-bearing activity leads to bone demineralization, which releases calcium from the bones into the bloodstream, causing hypercalcemia (high blood calcium).
Option B: Hyponatremia (low sodium) is not a direct result of immobility. It is typically caused by excessive fluid intake, syndrome of inappropriate antidiuretic hormone (SIADH), or certain diuretics.
Option D: Hyperkalemia (high potassium) is not a direct complication of immobility. It is most often associated with kidney failure, severe tissue damage (like burns or crush injuries), or medications such as ACE inhibitors and potassium-sparing diuretics.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Complications of Immobility as background academic context rather than a clinical decision trigger.
Nurses are at the forefront of DVT prevention for at-risk patients. Key interventions include encouraging early ambulation, performing active or passive range-of-motion exercises, applying sequential compression devices (SCDs), and ensuring adequate hydration.
A critical nursing assessment is to monitor for signs of DVT, which include unilateral (one-sided) calf pain, swelling, warmth, and redness. Any suspected DVT requires immediate notification of the healthcare provider.
What if? If the immobile patient had also undergone recent major orthopedic surgery (e.g., a hip replacement), their risk for DVT would be even higher. This is because the surgery itself contributes both endothelial injury and a hypercoagulable state, completing Virchow's triad.

How to Approach the Question

First, identify the core concept of the question, which is the physiological complications arising from prolonged immobility or bed rest.
Consider how lack of movement affects major body systems: cardiovascular, musculoskeletal, respiratory, and metabolic.
Evaluate each option against the known pathophysiology of immobility.
Recall Virchow's triad (venous stasis, hypercoagulability, endothelial injury) and its direct link to immobility (stasis) and DVT.
Analyze the electrolyte options. Remember that immobility affects calcium balance by causing bone breakdown, which leads to hypercalcemia, not hypocalcemia. This allows you to confidently eliminate that option.
Recognize that sodium and potassium levels are primarily regulated by the kidneys and hormones, and are not directly altered by physical inactivity alone.

Concept Tested & Keywords

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E6 Nursing Fundamentals Potter Perry 12e Part 4 p. 132-134

E6 Nursing Fundamentals Taylor p. 315-317