Mechanical Ventilation

Question 1

Criteria for weaning

Answer 1

Improvement in primary disease process
Hemodynamically stable
Absence of major organ failure
PEEP < or = 5cmH20
P:F > 150-200 with Fi02 <0.5
Adequate respiratory drive

Question 2

What is the equation for compliance?

Answer 2

Compliance= delta V divided by delta P

Question 3

Compliance in a ventilated patient

Answer 3

Tidal volume divided by driving pressure

Driving pressure = Pplat-PEEP

Question 4

Low compliance equals what

Answer 4

Stiff lungs!

Question 5

What are the different types of VILI

Answer 5

Barotrauma
Volutrauma
Bio trauma
Actelectotrauma

Question 6

Common factors that reduce likelihood of successful weaning

Answer 6

Lack of resolution of primary disease
Acquired resp muscle weakness
1. Inadequate recovery from drugs/NMB/sedation
2. Increase work of breathing (increased airway resistance, decreased lung compliance, decreased chest wall compliance)
3. Cardiovascular instability