How many breaths per minute does a patient who breathes 250 mL/breath need to achieve a normal alveolar ventilation of 4.2 L/minute?
A) 12 breaths per minute
B) 16 breaths per minute
C) 20 breaths per minute
D) 42 breaths per minute
D) 42 breaths per minute
Explanation: A) To achieve a normal alveolar ventilation of 4.2 L/min with breaths of 250 mL/breath first calculate the alveolar volume by subtracting the dead space: 250 mL - 150 mL = 100 mL. Then, convert the alveolar ventilation value from L to mL: 4200 mL/min. Now divide: 4200/100 = 42 breaths/minute.
B) To achieve a normal alveolar ventilation of 4.2 L/min with breaths of 250 mL/breath first calculate the alveolar volume by subtracting the dead space: 250 mL - 150 mL = 100 mL. Then, convert the alveolar ventilation value from L to mL: 4200 mL/min. Now divide: 4200/100 = 42 breaths/minute.
C) To achieve a normal alveolar ventilation of 4.2 L/min with breaths of 250 mL/breath, first calculate the alveolar volume by subtracting the dead space: 250 mL - 150 mL = 100 mL. Then, convert the alveolar ventilation value from L to mL: 4200 mL/min. Now divide: 4200/100 = 42 breaths/minute.
D) To achieve a normal alveolar ventilation of 4.2 L/min with breaths of 250 mL/breath, first calculate the alveolar volume by subtracting the dead space: 250 mL - 150 mL = 100 mL. Then, convert the alveolar ventilation value from L to mL: 4200 mL/min. Now divide: 4200/100 = 42 breaths/minute.
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