How to Increase the Expiratory Time on a Mechanical Ventilator? (TMC Practice Question)

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You are called to increase the expiratory time of a patient receiving volume control ventilation without altering the minute ventilation. Which of the following settings would you adjust in order to fulfill this request?
A. Rate of breathing
B. Inspiratory flow
C. Tidal volume
D. Trigger sensitivity

We know that adjusting the rate or tidal volume would alter minute ventilation, so we can rule those two out right away.

On most ventilators operating in the volume control mode, expiratory time is not set directly but is dependent on other settings. Essentially, expiratory time depends on the rate, volume, and flow settings.

But since we already ruled out rate and tidal volume, we know the correct answer has to be inspiratory flow.

Adjusting the sensitivity would only affect the expiratory time if it were in a full control mode, but this would also affect the minute ventilation, therefore, we can rule that one out as well. So by using the process of elimination, we know that the correct answer has to be B. Inspiratory flow.

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💡DISCLAIMER
Medicine and Respiratory Therapy are continuously changing practices. The information in this video is for educational and entertainment purposes only. For medical advice, please consult with a physician or qualified medical professional.

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