Oxygenation & Ventilation Flashcards
1
Q
What are the formulas for a Desired Rate or VT?
A
F = Known CO2 x Known F / Desired CO2 Vt = Known CO2 x Known Vt / Desired CO2
2
Q
What plateau pressure must we limit to
A
< 30
3
Q
What increases Vt in PC?
A
Increase in PIP and I-time…I-time won’t increase Vt in all breaths
4
Q
How do you achieve desired Vt in PC?
A
- Obtain targeted volume via Desired Vt Equation
- Obtain Cstat…
- If Pip 30 / Peep 5, exaled vt is 600, what is Cstat?
- 600/30 = 20 ml/cmh20
- Meaning…it takes 1 cmh20 to move 20 ml - If 700mL is desired Vt
- Cross multiply
- 1cmH20/20mL = (x)cmH20/700mL
- 700/20 = 35cmH20
- Add 5 of peep which then equals a set pip of 40
5
Q
What are contraindications and relativel contraindications of Permissive Hypercapnea?
A
Contraindications: Head injury/Intracranial lesions
Relatively Contraindicated: Cardiac Instability as it decreases myocardial contractivity, arrhyhmias
