65 - Critically Ill Patients + Mechanical Ventilation Flashcards
mechanical ventilation
process by which FiO2 is move din + out of lungs by mechncl vntlr
FiO2 of room air
21%
** also lowest setting we can give**
Target FiO2 is to maintain….
SpO2 >92%
PaO2 60-80 mmHg
signs of O2 toxicity
-uncontrolled coughing
-chest pain
-dyspnea
Positive Pressure Ventilation
during insprtn, vent pushes air into lungs under pos pressure
exprtn occurs pssvly like norm
2 types
2 types of pos pressure vent
volume vent
pressure vent
volume vent
tidal vol is consistent w each breath
-airway pressure varies to reach tidal vol
pressure vent
tidal vol delivered varies depending on selected pressure, compliance, + resistant factors
hyper/hypovent pH
hyper=alkalosis
hypo=acidosis
Mechanical Ventilation
SETTINGS
1 FiO2
2 RR
3 Tidal Vol [Vt]
4 Positive End Expiratory Pressure [PEEP]
5 Pressure Support
6 Peak Inspiratory Pressure [PIP]
FiO2
amt of O2 given
-lowest is 21 bc thats room air
Tidal Volume
volume of gas exchange w each breath
-to keep lungs open
-based on body wt
low Vt is indicated for _____
and high Vt may cause _____
low= stiff non compliant lungs
high= tachycardia, decr BP, + lung injury
PEEP
used to keep alveoli open
-norm 5
-can go up to 20
Higher PEEP can cause…
1 barrel trauma/pneumothorax
2 incr intrathoracic pressure> decr venous return> decr CO
3 incr ICP
