A client has come to the orthopedic clinic for a follow-up appointment 6 weeks after fracturing his ankle. Diagnostic imaging reveals that bone union is not taking place. What factor most likely contributed to this complication?

A. Malunion: Malunion happens when a fractured bone heals in an improper position, leading to deformity and functional impairment. While it is a concern, it typically develops over time during the healing process and is not an immediate early complication that the nurse would monitor for in the acute phase following a fracture.

B. Compartment syndrome: Compartment syndrome is a serious condition that can occur after an injury, such as a fracture. When there is increased pressure within a muscle compartment, it can lead to reduced blood flow, potentially causing tissue damage and nerve injury. Prompt recognition and intervention are crucial to prevent complications.

C. Fat embolism: Fat embolism occurs when fat particles from the bone marrow or other sources enter the bloodstream, often after a long bone fracture or major trauma. These particles can travel to the lungs and other organs, causing respiratory distress, confusion, and other symptoms. Fat embolism is a significant concern in orthopedic trauma patients and requires careful monitoring.

D. Deep vein thrombosis (DVT): DVT is the formation of blood clots in deep veins, usually in the legs. Patients with fractures, especially those immobilized for extended periods, are at increased risk for DVT. If a clot dislodges and travels to the lungs, it can cause a pulmonary embolism, which is a life-threatening complication.

E. Pulmonary emboli: Pulmonary emboli occur when blood clots, often originating from DVT, travel to the lungs and block pulmonary arteries. This condition can lead to sudden difficulty breathing, chest pain, and even cardiac arrest. Pulmonary embolism is a medical emergency and requires immediate intervention.

A. Hypovolemic shock: Hypovolemic shock occurs when there is a significant loss of blood or fluids in the body, leading to insufficient blood volume to maintain normal circulation. Symptoms include rapid heart rate, low blood pressure, confusion, and cold, clammy skin. While hypovolemic shock is a concern in trauma patients, the symptoms described by the client (shortness of breath and chest pain) are not typical of hypovolemic shock.

B. Fat embolism syndrome: Fat embolism syndrome occurs when fat particles are released into the bloodstream, often after a long bone fracture or trauma. These fat particles can block small blood vessels, leading to symptoms such as respiratory distress, confusion, and petechial rash (small red or purple spots under the skin). While fat embolism syndrome is a concern in patients with long bone fractures, the symptoms described by the client are more suggestive of a pulmonary embolism.

C. Venous thromboembolism (VTE): VTE refers to the formation of blood clots in the veins. Deep vein thrombosis (DVT) occurs when a blood clot forms in a deep vein, usually in the legs, while pulmonary embolism (PE) occurs when a clot breaks loose and travels to the lungs. Symptoms of PE can include sudden chest pain, shortness of breath, rapid heart rate, and cough, which may produce bloody or blood-streaked sputum. Given the client's symptoms of shortness of breath and chest pain, VTE, specifically pulmonary embolism, is a significant concern.

D. Compartment syndrome: Compartment syndrome occurs when there is increased pressure within a muscle compartment, leading to reduced blood flow and potential nerve damage. Symptoms can include severe pain, swelling, and numbness or tingling. While compartment syndrome is a complication of fractures, the symptoms described by the client (shortness of breath and chest pain) are not characteristic of compartment syndrome.