Ch. 11 & 12 of mechanical ventilation

The total respiratory cycle time

What is TCT

Inspiration time (Ti) + Expiratory time (Te)

Total cycle time (TCT)

4 seconds

How often will the patient get a breath from Total respiratory cycle time

1 second

How much will patient get a breath from inspiratory time (T1)?

3 seconds

How much will patient get a breath from expiratory time (Te)?

Time period from beginning inspiration to the beginning of next inspiration

What is total cycle time

Encourage work of breathing

Oxygen consumption

Minute ventilation

Myocardial work

What can happen if your patient is having dyssychrony?

With the assisted (Patient triggered) or Controlled (Time triggered) Breath

When can dyssynchrony can occur?

Both pressure-time Waveforms depict the step ascending ramp pattern

What does the waveforms look like if the patient triggers their own breath?

Patient is taking their own breath. Pressure-time waveform

What is this waveform?

Constant flow and pressure-time

What is this waveforms?

Descending ramp flow and pressure-time waveform

What is this waveform?

The patient triggered negative pressure for the first breath is enlarged to show the response time

What does pressure-time waveform shows

Dyssynchoronous ventilation as a result of a, inadequate initial peak flow, or b, inadequate mechanical tidal volume to meet patient demand

What does constant flow and pressure-time waveform shows

Showing dyssynchronous ventilation as a result of a, inadequate initial peak flow or b, inadequate mechanical title volume to meet patient demand

What descending ramp flow and pressure-time waveforms show

Increase in airflow resistance (Obstructive lung disease) Prolongs to expiatory time

The expiratory flow solid line in the flow-time waveform show

Air trapping, Auto-PEEP, and volutrauma.

When airflow resistant increase what can happen?

Normal airflow resistance (Dotted lines) And increase airflow resistance (Solid lines) On the expiratory, flow and pressure-time

What is this waveforms?

Flow and pressure time waveforms To show controlled mechanical ventilation.

Note the absence of negative triggering pressure before the beginning of inspiration

What is this Wave form

Flow and pressure time waveforms showing the affects of flow rate on PTA, PALV, And expiratory flow.

Increase of inspiratory flow or airflow resistance causes an increase of PTA, but no changes in peak PALV (Plateau pressure) and expiratory flow

What is this waveform?

Increase,higher

____ in flow rate cause as a ___ Airflow resistance, and thus corresponding responding increase in PIP and PTA

No

Does peak alveolar pressure Affected by changes in flow rate?

Increase

Decrease in lung thorax Compliance causes an ___ Increase in PALV and PIP

True

True or False Trans airway pressure (PTA) It’s not affected by changes in compliance