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Figure 1 | Critical Care

Figure 1

From: Carbon dioxide kinetics and capnography during critical care

Figure 1

(a) Scheme of carbon dioxide stores and transport. PaCO2, arterial PCO2; PACO2, alveolar PCO2; PETCO2, end-tidal PCO2; ♵A, alveolar ventilation; ♵CO2,ti, tissue carbon dioxide production; ♵D, dead space ventilation; ♵E, expired ventilation; ♵I, inspired ventilation. (b) Normal capnogram (tidal PCO2 versus time). Phase I, inspiratory baseline; Phase II, expiratory upstroke; Phase III, alveolar plateau; and Phase IV, inspiratory downstroke. Adapted from Breen [61].

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Critical Care

ISSN: 1364-8535