Ventilation Ratios and Minute Ventilation Quiz
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Questions and Answers

What does minute ventilation measure?

  • Pressure difference between plateau and PEEP
  • Ratio of tidal volume to respiratory rate
  • Volume of gas inspired over one minute (correct)
  • Change in pressure during inspiration
  • If a patient is 'over-breathing' the ventilator, what adjustment should be made?

  • Decrease tidal volume
  • Decrease respiratory rate
  • Decrease compliance
  • Increase minute ventilation (correct)
  • How is compliance calculated in relation to ventilation?

  • Pressure difference between inspiration and expiration
  • Difference between plateau pressure and PEEP
  • Ratio of tidal volume to respiratory rate
  • Volume divided by pressure change (correct)
  • In a patient with decreased lung compliance, what is expected of their inspiratory pressure?

    <p>It will need to be higher to achieve a certain tidal volume</p> Signup and view all the answers

    What adjustment can help a patient with increased PaCO2 from respiratory acidosis?

    <p>Increasing minute ventilation</p> Signup and view all the answers

    What happens to minute ventilation if tidal volume is increased?

    <p>Minute ventilation increases</p> Signup and view all the answers

    What is the independent variable in a volume-regulated mode on a ventilator?

    <p>Tidal volume</p> Signup and view all the answers

    In a pressure-regulated mode on a ventilator, what is the dependent variable?

    <p>Tidal volume</p> Signup and view all the answers

    For a set of non-compliant, stiff lungs, which mode of ventilation may result in a smaller tidal volume delivery?

    <p>Pressure-regulated mode</p> Signup and view all the answers

    How does lung compliance affect the inspiratory/plateau pressure needed to deliver a certain tidal volume?

    <p>Higher compliance requires lower pressure</p> Signup and view all the answers

    Which type of lungs can accept more volume at the same inspiratory pressure?

    <p>Compliant lungs</p> Signup and view all the answers

    What are typical initial ventilator settings for a newly intubated patient without underlying lung disease based on the text?

    <p>$2(PEEP + Tidal Volume)$</p> Signup and view all the answers

    What does PIP stand for in the context of mechanical ventilation?

    <p>Peak Inspiratory Pressure</p> Signup and view all the answers

    Which parameter helps to distinguish whether changes in airway pressure are due to lung stiffness or a flow-dependent issue?

    <p>R (Resistance)</p> Signup and view all the answers

    What does Cdyn represent in the context of mechanical ventilation?

    <p>Dynamic Compliance</p> Signup and view all the answers

    How is I:E ratio described in a person without an underlying lung disease?

    <p>1:2, spending twice as long at expiration</p> Signup and view all the answers

    Why is Pplat often slightly lower than PIP during mechanical ventilation?

    <p>Due to increased airway resistance</p> Signup and view all the answers

    How is VT/kg BW measured in mechanical ventilation?

    <p>Tidal Volume relative to Body Weight</p> Signup and view all the answers

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