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# Effect of Changes in Resistance and Compliance (2 of 2) ## The effect of decreased respiratory system compliance on the pressure waveform * Notice as the compliance decreases, the plateau pressure increases, which causes the peak inspiratory pressure (PIP) to increase because you are dividing by...

# Effect of Changes in Resistance and Compliance (2 of 2) ## The effect of decreased respiratory system compliance on the pressure waveform * Notice as the compliance decreases, the plateau pressure increases, which causes the peak inspiratory pressure (PIP) to increase because you are dividing by a smaller number. * If compliance decreases by half to 25 mL/cm H2O, the plateau pressure will increase to 22 cm H2O and the PIP will increase to 27 cm H2O. ## Scalars * A mechanical breath in a graphical format can be viewed in six stages (Figure 1-5): * Beginning of inspiration * Inspiration * End of inspiration * Beginning of expiration * Expiration * End of expiration * Components of the breath cycle **Figure 1-4:** The effect of decreased respiratory system compliance on the pressure waveform. **(Graph Description):** A graph plots pressure (vertical axis, in cm H₂O) against time (horizontal axis, in seconds). The graph shows a pressure waveform with a characteristic plateau during inspiration. The dashed line represents a hypothetical situation in which the compliance has decreased, leading to a higher plateau pressure. The x-axis ranges from 0 to 6 seconds. The y-axis ranges from -5 to 30 cm H₂O. **Figure 1-5:** Components of the breath cycle. **(Graph Description):** This figure displays three graphs depicting different aspects of a mechanical breath cycle. The first graph shows pressure (vertical axis, in cm H₂O) versus flow (horizontal axis, in L/min). The second shows volume (vertical axis, in L) versus flow (horizontal axis, in L/min). The third graph shows volume (vertical axis, in L) versus time (horizontal axis, in seconds). Each graph has several specific points labeled (A-F), potentially representing distinct stages of the breathing cycle, such as inspiration and expiration. The pressure graph displays pressure changes during the cycle. The flow graph indicates the rate of air flow. The volume graph shows changes in lung volume over time.