Calculate alveolar ventilation per minute of a patient with respiratory rate of 12/min, tidal volume is 500ml.: (A) 6 L / min, (B) 4.8 L / min, (C) 4.2 L / min, (D) 4 L / min
Answer is C. Alveolar Ventilation
= (Tidal volume - Dead space) X Respiratory rate
= (500 - 150) X 12
= 350 X 12
= 4.2 L / min