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Figure 1 | Critical Care

Figure 1

From: Clinical review: Respiratory monitoring in the ICU - a consensus of 16

Figure 1

The three phases of capnography tracings. Phase I contains gas fromthe apparatus and anatomic dead space (airway), phase II representsincreasing carbon dioxide concentration resulting from progressive emptyingof alveoli, and phase III represents alveolar gas. The highest point ofphase III is the end-tidal partial pressure of carbon dioxide(PetCO2). PaCO2, arterial partial pressure ofcarbon dioxide; PCO2, partial pressure of carbon dioxide.

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