A home health nurse is assessing a client who is recovering from an acute myocardial infarction (MI). Which of the following assessment findings should the nurse report to the provider as a possible indication of left-sided heart failure?

A. A 24-year-old male who has a casted femur fracture: Long bone fractures, particularly of the femur, are the most common cause of fat embolism syndrome (FES). Fat globules can enter the bloodstream from the bone marrow, leading to respiratory, neurologic, and dermatologic manifestations. Young adults are at higher risk due to the frequency of high-energy trauma.

B. A 10-year-old female who has an ulnar fracture in an external fixator: FES is rare in small bone fractures such as the ulna, especially in children. The risk is minimal because less marrow fat is released into circulation compared with long bones like the femur.

C. A 45-year-old male who has multiple rib fractures: Rib fractures carry a low risk for FES because they involve flat bones with less marrow fat. The primary complications are respiratory in nature, such as pneumothorax or pulmonary contusion.

D. A 62-year-old female who has vertebral fractures due to osteoporosis: Vertebral fractures in older adults rarely result in FES because the marrow fat released is minimal, and low-energy trauma is usually involved. Other complications, such as spinal cord injury or chronic pain, are more likely.

Rationale for correct choices

• Hypoxemia: The client has an oxygen saturation of 88% on room air and 89% on 2 L/min via nasal cannula, which indicates inadequate oxygenation. Hypoxemia is immediately life-threatening if not addressed promptly and takes priority over infection, hyperglycemia, or dehydration. Correcting oxygenation helps prevent tissue hypoxia and supports organ function.

• Oxygen saturation: The oxygen saturation measurement directly reflects the client’s hypoxemic status. Continuous monitoring of oxygen saturation is critical to evaluate the effectiveness of supplemental oxygen therapy and guide adjustments. This parameter is an objective indicator of respiratory compromise and provides the most immediate evidence for urgent intervention.

Rationale for incorrect choices

• Infection: The client has pneumonia evidenced by fever, productive cough with yellow sputum, and elevated WBC count. While infection requires prompt antibiotic therapy, it is not more immediately life-threatening than hypoxemia. Addressing oxygenation takes precedence before managing the underlying infection.

• Type 2 diabetes mellitus: The client’s blood glucose is elevated at 195 mg/dL, reflecting hyperglycemia. Although this requires monitoring and potential insulin therapy, it is not an immediate threat to oxygenation or organ perfusion. Hyperglycemia management is important but secondary to correcting hypoxemia.

• Dehydration: The BUN is slightly elevated at 25 mg/dL, which may indicate mild dehydration. The client is receiving IV fluids to support hydration. While fluid balance should be monitored, dehydration is not the most urgent issue compared with the client’s low oxygen saturation.

• BUN level: BUN elevation provides indirect evidence of fluid status or renal function but does not indicate immediate risk to tissue oxygenation. It is important for ongoing assessment but does not guide the initial urgent intervention.

• Blood glucose: Blood glucose reflects the client’s diabetic status and hyperglycemia. It is important to monitor and manage over time, but it does not provide the immediate evidence of hypoxemia that requires urgent correction.

• WBC count: Elevated WBC indicates infection and systemic inflammation. While this guides antibiotic therapy and monitoring, it does not address the immediate risk posed by hypoxemia. Prompt oxygen therapy takes priority.