A nurse is assessing a patient who has been on bed rest for 5 days following abdominal surgery. Which assessment finding would be the priority concern related to immobility complications?

Unilateral leg swelling with warmth and tenderness indicates possible DVT, a life-threatening complication of immobility requiring immediate intervention. Other findings are less urgent complications of bed rest.

Clinical Reasoning and Priority Setting

The correct answer is unilateral leg swelling with warmth and tenderness. In a patient immobilized for five days following abdominal surgery, this finding represents the highest priority because it is the classic clinical presentation of a deep vein thrombosis (DVT). The urgency stems from the immediate, life-threatening risk that a fragment of the clot will dislodge and travel to the lungs, causing a pulmonary embolism (PE).

Pathophysiology of Immobility-Related DVT
The underlying mechanism is rooted in Virchow's triad, which describes three broad categories of factors that contribute to thrombus formation: venous stasis, endothelial injury, and hypercoagulability. Prolonged bed rest directly induces venous stasis, particularly in the deep veins of the lower extremities where blood flow depends heavily on the calf muscle pump. Without regular muscle contraction, blood pools, creating a low-flow environment that allows activated clotting factors to accumulate and form a clot ^[2]. Simultaneously, major abdominal surgery activates the body's clotting cascade as part of the physiological stress response, creating a transient hypercoagulable state. The combination of surgery-induced hypercoagulability and immobility-induced stasis creates a high-risk environment for DVT .

Analysis of Clinical Findings
The finding of unilateral leg swelling is a critical distinguishing feature. While mild, bilateral edema might be expected from fluid shifts during bed rest, a single swollen leg points toward a localized obstructive process. The accompanying warmth and tenderness are signs of the localized inflammatory response to the thrombus and venous wall irritation. This presentation must be treated as a DVT until proven otherwise, as the risk of a fatal PE is the most immediate threat to the patient's life ^[1][4].

Prioritization Among the Options
The other options represent expected or less critical complications of immobility. Mild muscle weakness (Option 1) and a slight decrease in range of motion (Option 4) are anticipated consequences of disuse atrophy and joint stiffness from five days of bed rest. While they require nursing interventions like progressive mobilization and range-of-motion exercises, they do not pose an immediate threat to survival. Similarly, decreased appetite and mild nausea (Option 2) can be a common postoperative issue related to anesthesia, pain medication, or slowed gastrointestinal motility. Using the nursing process and the ABC (Airway, Breathing, Circulation) priority framework, the risk of a circulatory complication—a DVT that can become a PE and compromise both breathing and circulation—takes absolute precedence over a musculoskeletal, nutritional, or comfort-related concern. The nurse’s immediate action must be to report this finding to the healthcare provider for urgent diagnostic testing and initiation of anticoagulation therapy, while ensuring the patient maintains strict bed rest to prevent clot dislodgement ^[2][4].