Mechanical Ventilation Flashcards
___ is the percentage of oxygen delivered during a single breath
FiO2
fraction of inspired oxygen
Tidal volume given to ARDS pts?
4-6 mL/kg
__ is the volume of gas delivered to lungs per unit time
inspiratory flow rate
traditionally started at 40-60L/min
What is PEEP?
positive pressure applied to lungs at end of expiration
increases surface area of alveoli
Ventilator concepts:
TLC
T - trigger; when breath starts
L - limit; how fast breath enters
C - cycling; when breath changes from inhalation to exhalation
3 classifications of ventilation?
volume-cycled
pressure-cycles
time-cycled
volume-cycled most common in adults
What mode of ventilation is the mode of choice in ARDS?
assist-control ventilation (AC)
one step below continuous mandatory
mandatory respiratory rate is set
cycling can be with volume or pressure
What is biggest difference between assist control (AC) and synchronized intermittent mandatory ventilation (SIMV)?
in SIMV no assistance when pt triggered breath occurs; the pt’s tidal volume is used
pt contributes to their own respiratory effort
With pressure support ventilation (PSV) the machine requires full spontaneous respiratory effort by pt
a. true
b. false
a. true
4 phases of ARDS:
HEPF
H - healthy
E - exudative
P - proliferative
F - fibrotic
Berlin Definition of ARDS is PaO2:FiO2 of what?
< 300mmHg
Berlin Definition:
Mild ARDS is PaO2:FiO2 of __
201-300mmHg
Berlin Definition:
Moderate ARDS is PaO2:FiO2 of __
101-200mmHg
Berlin Definition:
Severe ARDS is PaO2:FiO2 of __
100mmHg or less
Mechanical ventilation tidal volume with ARDS is __ mL/kg IBW
4-6
