A 70-inch, 90 kg male patient is received in PACU orally intubated following gall bladder surgery. Which of the following tidal volumes is most appropriate for this patient?

- 300 ml
- 600 ml
- 750 ml
- 800 ml

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### 2. 600 ml

## Explanations

__First__,** **calculate the patient’s predicted body weight to find the appropriate tidal volume for this 70-inch patient. Anytime a patient’s height is given in an exam question, we should calculate and use their predicted body weight to find the appropriate tidal volume.

PBW = 50 + 2(each inch the patient is greater than 60 inches)

PBW = 50 + 2(10)

PBW = 50 + 20

PBW = 70 kg

__Next__, there is no evidence this patient has poor compliance (stiff lungs), so we will multiply the patient’s PBW by 6 ml and 10 ml to find the acceptable tidal volume range.

70 x 6 ml= 420 ml

70 x 10 ml = 700 ml

The acceptable tidal volume range for this patient is between 420 and 700 ml. Therefore, answer 2 is correct because it is the only choice that falls within this acceptable tidal volume range.