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Table 4 Combination of clinical probability and PetCO2 measurement in patients with positive D-dimer and suspected pulmonary embolism

From: Capnometry in suspected pulmonary embolism with positive D-dimer in the field

Combinations

PE

No PE

PE likely

OR

PetCO2 < 28 mmHg

(suggests PE possible)

41

24

PE unlikely

AND

PetCO2 > 28 mmHg

(Rule out PE)

0

35

PE likely

AND

PetCO2 < 28 mmHg

(suggests PE possible)

24

4

PE unlikely

OR

PetCO2 > 28 mmHg

(Rule out PE)

17

55

  1. PE = pulmonary embolism; PetCO2 = partial pressure of end-tidal carbon dioxide.
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Critical Care

ISSN: 1364-8535