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# Introduction (3 of 4) * **Time-Based Capnography** * A typical single-breath time-based capnogram comprises of four phases. * $CO_2$ concentration plotted against time (time-based capnography); $PCO_2$, partial pressure of $CO_2$ in the expired gas; $PETCO_2$, partial pressure of end-tida...

# Introduction (3 of 4) * **Time-Based Capnography** * A typical single-breath time-based capnogram comprises of four phases. * $CO_2$ concentration plotted against time (time-based capnography); $PCO_2$, partial pressure of $CO_2$ in the expired gas; $PETCO_2$, partial pressure of end-tidal $CO_2$. # Introduction (4 of 4) * **Volume-Based Capnography (volumetric capnography)** * $CO_2$ concentration plotted against exhaled volume (volume-based capnography). $VD$, volume of anatomy dead space; $VT$, tidal volume; $PETCO_2$, partial pressure of end-tidal $CO_2$; $PaCO_2$, partial pressure of arterial $CO_2$. **Figure 7-1:** $CO_2$ concentration plotted against time (time-based capnography); $PCO_2$, partial pressure of $CO_2$ in the expired gas; $PETCO_2$, partial pressure of end-tidal $CO_2$. **Figure 7-2:** $CO_2$ concentration plotted against exhaled volume (volume-based capnography). $V_d$, volume of anatomy dead space; $V_t$, tidal volume; $PETCO_2$, partial pressure of end-tidal $CO_2$; $PaCO_2$, partial pressure of arterial $CO_2$. Copyright © 2021 by Jones & Ba

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