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Berlin Criteria for Acute Respiratory Distress Syndrome (ARDS) 
- Respiratory symptoms must have begun within one
Berlin Criteria for Acute ... week of a known clinical ... mm Hg < PaO2 / FiO2 ... mm Hg < PaO2 / FiO2 ... H2O #ARDS #Acute
Acute Respiratory Distress Syndrome – ARDS: Clinical Cheat Sheet

An acute diffuse, inflammatory lung injury, leading to
Acute Respiratory ... Syndrome – ARDS: Clinical ... Cheat Sheet An acute ... criteria (2013) ● Acute ... or CXR ● PaO2/FiO2
Mask Oxygen Delivery Devices

Simple Mask aka Hudson's Mask:
 • Flow 6-10 LPM
 • FiO2 35-50%
Face Tent:
Flow 6-10 LPM • FiO2 ... 10-15 LPM • FiO2 ... Flow 2-15 LPM • FiO2 ... 10-15 LPM • FiO2 ... 10-15 LPM • FiO2
Oxygen Delivery Systems
Nasal Cannula:
 • Flow: 1 - 6 L/min
 • FiO2: 25 - 40% (-4%/L
- 6 L/min • FiO2 ... - 10 L/min • FiO2 ... - 15 L/min • FiO2 ... on valve) • FiO2 ... - 15 Lmin • FiO2
Understanding & Treating ARDS - Acute Respiratory Distress Syndrome

•  Timing - within one week of
Treating ARDS - Acute ... Oxygenation PaO2/FiO2 ... Respiratory #Distress #Acute
Oxygen Delivery by Device

Nasal Cannula 
• Indicated for low-flow, low-percentage supplemental oxygen. 
• Flow rate of
high percentage FiO ... set to desired FiO2 ... deliver desired FiO ... Oxygen #Delivery #FiO2
Oxygen Delivery Systems and Approximate FiO2:
#Management #SupplementalO2 #Oxygen #Delivery #Devices #Interface #FiO2 #NonRebreather #HFNC #NasalCannula #Simple
and Approximate FiO2 ... Devices #Interface #FiO2
Approach to the A-a Gradient
A-a gradient = PAO2 - PaO2
A-a gradient = [FiO2 x (Patm -
A-a gradient = [FiO2 ... chest) • Low PiO2 ... Elevation, Low Fio2
Oxygen Delivery Devices - Comparison
Low Flow:
 • Nasal cannula (1-6L, 24-40% FiO2)
 • Face mask (5-10L,
(1-6L, 24-40% FiO2 ... (5-10L, 35-60% FiO2 ... (5-15L, 35-50% FiO2 ... (1-15L, 24-45% FiO2 ... (2-15L, 24-50% FiO2
PROSEVA definition of ARDS
Thus, the PROSEVA trial essentially modifies the Berlin definition of ARDS, with the
that the PaO2/FiO2 ... that the PaO2/FiO2