Pulmonary Embolism Rule-out Criteria Calculator

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Pulmonary Embolism

We speak of pulmonary embolism when a clot, also called a thrombus, circulating in the blood will obstruct the pulmonary artery. It is one of the two manifestations, along with deep vein thrombosis, of thromboembolic disease.

Pulmonary embolism is essentially secondary to the migration of a blood clot formed in the venous network of the lower limbs (phlebitis). The formation of this clot is favored by several factors:

a prolonged stasis such as can be seen in the case of bed rest for several days, whatever the cause: illness, surgery, etc. A trip seated for several hours may be sufficient: “long haul syndrome”;

low output such as heart failure;

a disease likely to lead to acquired “hypercoagulability” such as cancer or an autoimmune disease;

the presence of congenital thrombophilia (coagulation abnormality leading to a state of "hypercoagulability");

after childbirth, the risk is highest during the first six weeks.

Pulmonary Embolism Rule-out Criteria Calculator

The PERC rule (Pulmonary Embolism Rule-out Criteria) aims to identify patients with such a low probability of PE that the measurement of D-Dimer is superfluous to rule out this diagnosis as reliably. It can therefore be used when a test is positive for no obvious reason.

The rule has eight conditions that must be met without exception (score = 8) for the patient to be considered at a very low risk of pulmonary embolism.