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===Capnograph===
===Capnograph===
[[Image:Capnograph.jpg|Center]]
[[Image:Capnograph.JPG|left]]
<center>
<center>
{| border="1" cellpadding="6"
{| border="0.5" cellpadding="6"
|-style="background:#B0E0E6; color:black"
|-style="background:#B0E0E6; color:black"
!'''Stage'''
!'''Stage'''
|- style="background:#F0F8FF; color:black"
|- style="background:#F0F8FF; color:black"
|<font color=#0C1A5D>'''B''' </font>
|<font color=#0C1A5D>'''B''' </font>
|Start of phase 1 - The beginning of the respiratory upstroke.
|Start of phase 1.
The beginning of the respiratory upstroke.
|-
|-
|<font color=#0C1A5D>'''C''' </font>
|<font color=#0C1A5D>'''C''' </font>
|End of phase 1 and the beginning of the expiratory plateau.
|End of phase 1.
The beginning of the expiratory plateau.
|- style="background:#F0F8FF; colour:black"
|- style="background:#F0F8FF; colour:black"
|<font color=#0C1A5D>'''D''' </font>
|<font color=#0C1A5D>'''D''' </font>
|}
|}
</center>
</center>
* Phase 1 is the inspiratory baseline and indicates inspired carbon dioxide, therefore should be zero.
* Phase 2 is the expiratory upstroke and indicates the alveoli and conducting airway carbon dioxide levels.
* Phase 3 is the expiratory plateau which indicates pure alveoli carbon dioxide levels.
* Phase 4 is the inspiratory downstroke indicating the start of inspiration.
===Increases in End Tidal Carbon Dioxide===
===Increases in End Tidal Carbon Dioxide===