Anesthesia

Question 1

Describe Volume Control

Answer 1

Most common in OR

Preset TV

TV, RR set by provider

Flow rate is fixed. Too low won’t work, too high will increase pressures

Question 2

Describe Pressure Control

Answer 2

Set inspiratory pressure

TV variable, depends on rise time and set pressure

Flow decreases as pressure rises, ceases when set pressure is reached

Used in situations where pressures can be high. Useful for neonates/premature infants

Question 3

Describe IMV

Answer 3

Vent will deliver mandatory breaths at preset rate

Allows for spontaneous breaths

Secondary gas source for spontaneous breaths

Good for weaning

Question 4

Describe SIMV

Answer 4

Just like IMV but synched with spontaneous patient effort

Question 5

Describe Assist Control

Answer 5

Pt effort creates sub-baseline pressure that triggers the vent to give a set TV

If rate drops below set minimum, vent takes over with a full control mode

All breaths are fully assisted

Can be pressure or volume controlled

Question 6

Describe Pressure Support

Answer 6

Pressure held constant through inspiratory phase

Goal is to increase pt’s spontaneous TV by delivering volumes ~10-12ml/kg

Decreases work of breathing, delays fatigue

Question 7

Describe High Frequency Ventilation

Answer 7

Low tidal volumes (less than dead space)

High rate 100-200 bpm

IT 33%

Drive pressure 15-30psi