Final answer:
The usual first treatment for pulmonary embolism (PE) is anticoagulation therapy. This treatment helps prevent the clot from getting bigger and dissolves the existing clot. Other interventions, such as oxygen therapy and surgery, may be necessary depending on the severity of the condition.
Step-by-step explanation:
The usual first treatment for pulmonary embolism (PE) is b) Anticoagulation therapy.
Pulmonary embolism occurs when a blood clot (thrombus) partially or completely blocks blood flow to the lungs. Anticoagulation therapy, also known as blood thinners, is used to prevent the clot from getting bigger and to help dissolve the existing clot. This treatment reduces the risk of further complications and allows the body to naturally break down the clot over time. Other interventions, such as oxygen therapy and surgery, may be necessary depending on the severity of the condition. However, anticoagulation therapy is typically the first line of treatment for most cases of pulmonary embolism.