Chapter 46 Ventilator Waveform Interpretation Flashcards
What is the equation of motion on the ventilator
Inspiratory pressure of the ventilator + Inspiratory Pressure of the Muscle = (Elastance x volume)+ (Resitance x Flow)
Elasteance is the inverse of
Compliance
What are the 3 types of breath sequence on the ventilator.
- Continuous Mandatory Ventilation (CMV)- All breaths are mandatory. Can be triggered by patient but all breaths are cycled by the ventilator.
- Continuous Spontaneous Ventilation (CSV)-All breaths are spontaneous
- Intermittent Mandatory Ventilation (IMV)- Spontaneous breaths can occur in between mandatory breaths (4 subgroups)
What are the components of a ventilator mode?
What are the 4 Types of Intermittent Mandatory Ventilation
1.Mandatory Breaths occur independently of spontaneous breaths- Mandatory breaths may be synced to patient effort but baseline rate is maintained
2. You are suppressed by spontaneous breaths
3. Mandatory pressers pressed face at perimeter is higher than a set value (example of spontaneous manipulation)
4. Mandatory breaths convert to spontaneous breaths due to patient effort.
Mandatory breaths are naturally____ likely to induce synchrony problems.
More because the patient has lost control of the times of inspiration
Describe the setpoint target scheme
Clinicians sets all ventilator targets. Example pressure support.
Describe dual targeting scheme
The ventilator switch is a control variable during the breath. Example during the breath, the ventilator switches from control flow to control and pressure or vice versa.
Describe bio-variable ventilator targeting scheme
The ventilator randomly changes, the title volume or pressure support to mimic the variability scene with normal breathing.
Describe the servo ventilator targeting scheme
Ventilator will following signal automatically use any positive feedback control. Example of the inspiratory pressure is automatically adjusted proportionally to the patient’s inspiratory effort.]
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Describe the adaptive ventilator target scheme
The ventilator adjusts, one or more variables automatically to achieve a clinician’s preset target. The change will occur in between breaths. An example is PRVC, in which the clinician sets a target title volume in the ventilator, adjust the inspiratory pressure based on an algorithm to achieve a preset target average tidal volume.
Describe the adaptive ventilator target scheme
The ventilator adjusts, one or more variables automatically to achieve a clinician’s preset target. The change will occur in between breaths. An example is PRVC, in which the clinician sets a target title volume in the ventilator, adjust the inspiratory pressure based on an algorithm to achieve a preset target average tidal volume.
Describe the optimal ventilator target Scheme
Ventilator tries to optimize predefined goal. Ex minimize work rate of breathing. Vent will calculate targets like tidal volume and rate.
Describe Intelligent ventilator target Scheme
Vent uses AI to adjust targets
Volume is the integral of ___  wait respect to ____
Flow, time 
Volume is the integral of ___  wait respect to ____
Flow, time 
The time constant is the product of
Resistance time compliance
Short is usually from low compliance
Long is usually from high resistance
