Positive pressure ventilation Vt normal range 6-8mL/kg
Spontaneous breathing normal Vt range 5-7mL/kg
Normal Plateau pressure < 30
Normal Vt range in ARDS pt's 4-6mL/kg
What is airway resistance? Airflow obstruction in airways
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, AL 291 Chapter One Quiz
What contributes to RAW? 1. length, size patency of airway, ETT & ventilator circuit.
2. Retained secretions
3. Alters in airway (growth or changes in bronchial muscle)
4. Changes on the outside of the airway.
Normal RAW in adults who are healthy? 0.5-2.5mL/cmH2O/L/sec.
RAW in children and intubated pts is Much Higher
Formula for Airway resistance Peak - Plateau/Flow
Peak Inspiratory Pressure (PIP) is influenced 1. Resistance (RAW)
by 2. Compliance
Plateau Pressure is influenced by Compliance
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