A 76-year-old patient is 2 days post-op total hip replacement. The patient puts his call light on to complain of difficulty catching his breath. As the nurse assesses the patient, she finds the patient tachypneic, tachycardic, and very anxious. The nurse determines these are most likely signs of:

Choice A reason: Pulmonary embolism is a blockage in one of the pulmonary arteries in the lungs, usually caused by blood clots that travel to the lungs from the legs or other parts of the body. The signs and symptoms include sudden shortness of breath, rapid breathing (tachypnea), rapid heart rate (tachycardia), and anxiety. These symptoms align with the patient's presentation and are common in the post-operative period, particularly after orthopedic surgery, which increases the risk of deep vein thrombosis (DVT) and subsequent pulmonary embolism.Choice B reason: Left-sided heart failure can cause symptoms such as shortness of breath, fatigue, and fluid retention. However, the acute presentation of difficulty breathing, tachypnea, tachycardia, and anxiety in the context of recent surgery is more suggestive of a pulmonary embolism. Heart failure symptoms generally develop gradually rather than suddenly.Choice C reason: Early onset dementia is not characterized by acute respiratory symptoms like difficulty breathing, tachypnea, or tachycardia. Dementia symptoms typically include memory loss, confusion, and changes in cognitive function, not the acute cardiorespiratory symptoms described in this scenario.Choice D reason: Acute myocardial infarction (heart attack) can cause shortness of breath, chest pain, and rapid heart rate. While it is a possibility, the combination of recent surgery and the described symptoms more strongly suggests a pulmonary embolism. An acute myocardial infarction would typically also present with chest pain, which is not mentioned in this scenario.