RAW And Work Of Breathing

Airway Resistance (RAW) And Work Of Breathing
A. Airway resistance is calculated based on the change in pressure / flow of air = pressure change / Flow
B. Raw = (P2 – P1) / flow
1. P2 = Peak airway pressure
2. P1 = Plateau pressure
3. Flow = liters / sec
C. Any increase in airway resistance would improve the work of breath
D. Patients who are unable to overcome resistance by increasing the road winded breath work
E. In patients with chronic astma (chronic airway obstruction), there was water traping so high lung compliance, and therefore the pattern of breath but usually in the slowly
– However, in patients with COPD (lung restriktive) pattern is fast and shallow breathing, because the cause is not obstruction

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