Summary
D-dimer levels appear to be associated with the extent of the thromboembolic burden
in patients with pulmonary embolism (PE).We therefore hypothesized that D-dimer levels
at admission would be associated with prospective risk of mortality in patients with
PE. We used data from 366 patients diagnosed with PE at four hospital emergency departments.
A highly sensitive D-dimer test was prospectively performed at admission. The outcome
was overall mortality within three months. We divided patients into quartiles on the
basis of their D-dimer levels and compared mortality rates by quartile. We estimated
sensitivity, specificity, and predictive values for mortality in the first and fourth
quartile. Overall mortality was 5.2%. Patients who died had higher median D-dimer
levels than patients who survived (4578 versus 2946 µg/l; P=0.005). Mortality increased with increasing D-dimer levels, rising from 1.1% in the
first quartile (<1500 µg/l) to 9.1% in the fourth quartile (>5500 µg/l) (P=0.049). Sensitivity, specificity, and positive and negative predictive values of
D-dimer levels <1500 µg/l to predict mortality were 95%, 26%, 7%, and 99%, respectively.
Patients with PE who have D-dimer levels below 1500 µg/l havea very low mortality.
Further studies must assess whether D-dimer, alone or combined with other prognostic
instruments for PE, can be used to identify low-risk patients with PE who are potential
candidates for outpatient treatment or an abbreviated hospital stay.
Keywords
D-dimer - pulmonary embolism - prognosis