Pulmonary embolism is a pathology of frequent presentation associated with high mortality rates; it is clinically characterized by highly unspecifi c signs and symptoms. Several modalities for its diagnosis exist: clinical prediction scores (revised Wells and Geneva scores), D-dimer, computed tomography pulmonary angiography, magnetic resonance angiography, X-rays, pulmonary ventilation/perfusion scan, helical computed tomography, electrocardiogram, echocardiogram and venous ultrasonography. Other tests, such as impedance plethysmography and phlebography were previously useful in the diagnostic protocol of deep vein thrombosis, and thus, pulmonary embolism; nevertheless, nowadays they have been displaced by tests with higher sensitivity and specifi city. Several laboratory tests that measure biological markers useful in diagnosing pulmonary embolism have been developed; among them are brain natriuretic peptide, heart fatty acid binding protein, neutr ophil gelatinaseassociated lipocalin and cystatin C.
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