Table 3

Additional use of alveolar dead space ventilation fraction for diagnosing PE in patients with a low or intermediate the clinical probability and positive D-dimer (n=65)

PE (+), n=9PE (−), n=56
ADSF ≥0.2920
ADSF <0.2036
  • Sensitivity, 100% (95% CI 70.1% to 100%); specificity, 64.3% (95% CI 51.2% to 75.5%); false negativity, 0% (95% CI 0% to 9.6%).

  • PE, pulmonary embolism; ADSF, alveolar dead space fraction.