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What is the alveolar ventilation of a patient who is breathing 15 times per minute and has a dead space volume of 300 mL and a tidal volume of 500 mL?

Question

What is the alveolar ventilation of a patient who is breathing 15 times per minute and has a dead space volume of 300 mL and a tidal volume of 500 mL?

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Solution

Alveolar ventilation refers to the amount of fresh air that reaches the alveoli per minute. It can be calculated using the formula:

Alveolar Ventilation = (Tidal Volume - Dead Space Volume) * Breathing Rate

Given in the question:

Tidal Volume (TV) = 500 mL Dead Space Volume (DSV) = 300 mL Breathing Rate (BR) = 15 breaths per minute

Substitute these values into the formula:

Alveolar Ventilation = (500 mL - 300 mL) * 15 breaths per minute Alveolar Ventilation = 200 mL/breath * 15 breaths per minute Alveolar Ventilation = 3000 mL/minute

So, the alveolar ventilation of the patient is 3000 mL/minute.

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