Once you derive an estimate of the minute ventilation V E needs of the patient you can use your previously determined tidal volume and simple division to calculate an appropriate respiratory rate RR V E tidal volume This practice is particularly important in the period immediately following intubation. Keep in mind that this is not a physiologic determination of tidal volume--only an estimation. When the patient is intubated the recommendation is to subtract volume equal to one-half body weight in pounds which is to say 1ml of tidal volume per every two pounds of predicted body weight or roughly 1 ml per kg.
In addition the emerging evidence indicates that LTVV is a best practice for all ventilated patients to reduce ventilator-associated harm.
Calculate the tidal volume by multiplying 12 ml by the ideal body weight in kg 1. This formula is for someone who is resting comfortably and in excellent health. For patients with asthma or emphysema multiply 10 ml by the ideal body weight. 12 Inspiratory reserve volume IRV Amount of air that can be further inhaled after a normal inhalation.