Vent

Question 1

SIMV w/PS

Answer 1

Spontaneous breaths are inadequate (less than 5 ml/kg)

Question 2

SIMV Mode

Answer 2

• Asthmatic
• Weaning
• Pt making respiratory efforts

Question 3

PEEP

Answer 3

• Start w/2-4 cm H20
• Helps improve oxygenation
• Helps unstable alveoli and airways from collapsing
• Increases FRC (Functional Residual Capacity)
• Improves lung compliance (ARDS patients)

Question 4

IBW

Answer 4

Male 106+(6xInches above 5’)

Female 105+(5xInches above 5’)

Question 5

Flow

Answer 5

Flow L/min = (Vt(L)/Tinsp) x 60

Flow = Minute Vent x Sum of I:E

Question 6

Inspiratory Time

Answer 6

Tinsp = (Vt L/Flow) x 60
Typically start at 1.0 sec
Short I-time with obstructive diseases (COPD, Asthma)
Longer I-time use for restrictive diseases (ARDs)

Question 7

Flow Rates

Answer 7

Flow is set instead of I-time with some vents
Faster flow rates = shorter I-time
Slower flow rates = longer I-time

Question 8

I:E Ratio

Answer 8

=60sec/rate = TCT (60/10 = 6sec)
TCT - Itime = Etime )6sec - 1.2 sec = 4.8 sec
1.2/1.2 : 4.8/1.2 = 1:4

Question 9

Sensitivity

Answer 9

Determines how much inspiratory effort the patient will have to exert before the vent will respond
Sensitivity settings can be: flow or pressure
Pressure Sensitivity: Generally set between -0.5 to 2cm
Flow Sensitivity: Generally set between 1 to 3 L/min
(1 L/min is very sensitive)(5 L/min would be insensitive)