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Diagnostic accuracy of capnovolumetry for the identification of airway obstruction – results of a diagnostic study in ambulatory care

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Academic year: 2020

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Figure

Fig. 1 Tracing of a volume-based capnogram during a single expiration. The capnogram is divided into four phases: phase 1, the CO 2 -devoid volume of the dead space; phase 2, transition between airway and alveolar gas; phase 3, alveolar part; phase 4, fina
Fig. 2 Flow-chart of the selection process leading to the final population of 1287 patients
Table 2 Parameters of capnographic measurements
Fig. 3 ROC-curves for the recognition of airway obstruction. The AUC for the ratio of slopes s3 and s2 (s3/s2) was 0.678 (95% CI 0.645, 0.710)

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