Principles of Vent graphics

What waveform/scalar can tell you the mode you are in

Flow

What can you assess in a pressure waveform/scalar

-Pt effort

-asynchrony

-Pplat

-PIP

-peep

What can you assess in a flow waveform/scalar

-auto-peep

-PIP

-expiratory flow

-mode

-bronchodilator response

What are things you can assess in volume waveform/scalar

-Tidal volume

-Leak

-air-trapping

-auto-peep

What waveform will you see in a spontaneous mode?

Sinusoidal

The pressure/time scalar in a volume mode will show what shape for mandatory breaths?

exponential rise or accelerating ramp

The pressure/time scalar in a pressure mode will show was shape?

rectangular or square

-meaning the pressure is constant

In a pressure/time waveform a negative deflection means what?

Negative pressure pulled by patient

What things can you find in a pressure/time scalar?

1. PIP

2. Pplat

3. RAW

4. Alveolar distending pressure

In a pressure/time scalar when there is RAW, PIP increases and Pplat...

Stays the same

In pressure/time scalar if the lung compliance decreases... what happens to the waveform size?

Increases

In the volume/time scalar, the volume waveform will look like

A mountain peak appearance at the top and possible plateau at the peak of the waveform

Volume/time scalar can show

-air-trapping(autopeep)

-leaks

-VT

-Active exhalation

-asynchrony

In a flow/time scalar in a volume mode, the shape of the waveform will be

square or rectangular

In a flow/time scalar in pressure mode, what is the shape of the waveform

decelerating ramp

Patients who air trap have longer...

e-time

In volume loops, the loops go in which direction

counterclockwise

It there is a patient effort detected, then what direction will the volume loops go?

clockwise

In pressure/volume loops, where is pressure and volume graphed on the line

volume on Y

pressure on X

Inspiratory is also known as

inspiratory resistance/resistive WOB

Expiratory is known as

Expiratory resistance, elastic WOB

In the pressure/volume loops, what does the beaking in the loop indicate

there is overdistention of the lung

In a pressure/volume loop, when there is increased RAW, what happens to the loop?

The loop widens

In a pressure/volume loop how will an Inc. compliance appear?

lifted up and to the left

In a pressure/volume loop how will a dec. compliance appear?

lowered down and to the right

When pressure and volume open up, this is known as

lower inflection point

What happens during lower inflection point?

Alveolar recruitment

In a flow/volume loop flow is on

Y-axis

In a flow/volume loop volume is on

X-axis