Article Figures & Data
Figures
- Fig 1.
Computed tomography pulmonary angiography (CTPA) positive and CTPA negative results for end-tidal carbon dioxide (ETCO2). The red line represents threshold of 4.3 kPa (32.3 mmHg). This figure shows that no patient with a ETCO2 of >4.3 kPa had a pulmonary embolism. PE = pulmonary embolism.
- Fig 2.
Area under receiver operator characteristic curves (AUROCCs) for the true positive rate against the false positive rate for different possible cut-off points. a) Wells score, AUROCC = 0.5891. b) D-dimer, AUROCC = 0.8468. c) End-tidal carbon dioxide, AUROCC = 0.8768.
Tables
- Table 1.
End-tidal carbon dioxide classification table over a range of cut-off thresholds
ETCO2, kPa Sensitivity, % Specificity, % Positive predictive value, % Negative predictive value, % 1 0 100 0 65 2 1 98 25 65 3 60 89 75 81 4 87 75 66 92 4.3 99 65 60 99 5 100 25 42 100 6 100 9 37 100 ETCO2 = end-tidal carbon dioxide.
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