Capnography is the noninvasive continuous measurement of CO2 concentration over time, providing numerical etCO2 data as well as graphic waveforms showing levels of CO2. In-depth understanding of changes in the Capnography waveform can assist the clinician in recognizing different clinical situations and reacting prior to patient deterioration. This interactive PDF will provide the student with advanced understanding of the capnography waveform and its abnormal presentation in the clinical setting.