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Fig. 2 | Critical Care

Fig. 2

From: A novel capnogram analysis to guide ventilation during cardiopulmonary resuscitation: clinical and experimental observations

Fig. 2

Quantification of thoracic distension: the distension ratio. The figure shows examples of capnograms representing different distension ratios (used to quantify thoracic distension) calculated as a continuous variable. Typical capnograms from the animal experiment are displayed for three values of “distension ratio”: 1.5 on panel A, 3.5 on panel B and 5.5 on panel C. X-axis corresponds to inspiratory and expiratory time. AUC1 represents the area under the CO2 curve between the beginning of the expiratory CO2 signal and the first local minimum (The first local minima having an amplitude two times lower than the mean amplitude of all peaks are discarded). AUC2 represents the area under the CO2 curve of the first “normal” oscillation corresponding to an efficient compression decompression phase around FRC. The distension ratio corresponds to the ratio AUC1/AUC2. It is used as a surrogate marker of the level of thoracic distension

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Critical Care

ISSN: 1364-8535