Practice Quiz

Respiratory Therapist

Category - Patient Evaluations and Recommendations

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Calculate the alveolar ventilation for a patient with a VTof 500 mL, respiratory rate of 12 bpm, total minute ventilation of 6000 mL/min, and dead space ventilation of 1800 ml/min.
  1. 5500 ml/min
  2. 4200 mL/min
  3. 3600 mL/min
  4. 1300 mL/min
Explanation
Answer: B - The patient’s alveolar ventilation is 4200 mL/min.

Alveolar ventilation is determined by subtracting the dead space ventilation from the tidal volume and multiplying it by the respiratory rate. Alveolar ventilation is the volume of inspired gas that reaches the alveoli and is available for gas exchange. The alveoli at the base of the lung are smaller but are more compliant.
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