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Pulmonary Embolism: Diagnosis and TreatmentDiagnosis:Wells' score + D-dimer testCTPA (gold standard)V/Q scan (if CTPA contraindicated)Treatment:Massive PE: Fibrinolysis or pulmonary embolectomySmall PE: Apixaban or rivaroxaban (first-line)Second-line: LMWH for 5 days, then dabigatranRecurrent PE: Vena caval filters (if anticoagulation contraindicated)