42. A 45-year-old patient presents with a sudden onset of shortness of breath, chest pain, and a rapid heart rate. The patient has a history of oral contraceptive use and recent long-distance air travel. Which treatment needs to be started immediately to prevent this patient's condition from worsening?

Answer: B

Explanation:

Heparin needs to be started immediately to prevent this patient's condition from worsening.

In this scenario, the patient is exhibiting signs consistent with a pulmonary embolism, commonly associated with prolonged immobility and oral contraceptive use. Administering heparin immediately is crucial for managing this condition and preventing further thrombotic complications.

A) Coumadin

Coumadin, or warfarin, is an anticoagulant that is typically used for long-term management of thromboembolic disorders. However, it does not provide the immediate anticoagulation needed in acute situations like this. Therefore, starting Coumadin would not be appropriate in this urgent scenario.

B) Heparin

Heparin is an anticoagulant that acts quickly to inhibit the formation of blood clots. In the case of a suspected pulmonary embolism, heparin is the drug of choice for immediate treatment, as it can quickly reduce the risk of further clot formation and stabilize the patient.

C) Aspirin

Aspirin is an antiplatelet agent that is generally used for preventing arterial thrombotic events rather than venous thromboembolism. Given the presentation of symptoms indicative of a pulmonary embolism, aspirin would not provide the necessary effect to prevent the condition from worsening.

D) Metoprolol

Metoprolol is a beta-blocker used primarily for managing hypertension and certain cardiac conditions. While it may help manage symptoms related to heart rate, it does not address the underlying thrombotic issue and is not an appropriate immediate treatment for suspected pulmonary embolism.

Conclusion

Heparin is the definitive treatment required in this case due to its rapid action in preventing the worsening of the patient's condition. Other options, such as Coumadin, aspirin, and metoprolol, do not provide the immediate anticoagulation effect necessary to manage a potential pulmonary embolism effectively. Thus, heparin is essential for stabilizing the patient and preventing further complications.