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# Clinical Applications of Capnography ## Hyperventilation and Hypothermia * This capnogram shows a steadily decreasing plateau. This is a result of hyperventilation or a decrease in metabolic rate. **(Figure 7-9)** _A graph showing a steadily decreasing plateau of PECO2 (mm Hg) over time._...

# Clinical Applications of Capnography ## Hyperventilation and Hypothermia * This capnogram shows a steadily decreasing plateau. This is a result of hyperventilation or a decrease in metabolic rate. **(Figure 7-9)** _A graph showing a steadily decreasing plateau of PECO2 (mm Hg) over time._ ## Airway Obstruction * Classical "sawtooth" slope or "shark fin" capnogram associated with airway obstruction of the asthmatic patient. * There is no distinct angle between phase II and phase III. This is because the dead space has not finished emptying by the time the next inspiration happens. **(Figure 7-11)** _A graph showing a "sawtooth" or "shark fin" pattern of PECO2 (mm Hg) over time associated with airway obstruction._ ## Emphysema * The waveform shows the characteristic downslope of phase III of the capnogram. * This is consistent with emphysema. **(Figure 7-13)** _A graph showing a downslope in phase III of the PECO2 (mm Hg) waveform, which is consistent with emphysema._