Ch 1 - When, Where, Why, and How of MV Flashcards
What are 3 reasons of providing ventilation and oxygenation?
- When someone can’t do it on their own
- When Person can only do this for some time on their own
- When person should not be doing it on their own.
What indicators could an RT use to decide if MV may be needed?
- Current CO2 levels too high, or anticipated to become too high.
- Current O2 levels too low (PaO2 or SpO2), or anticipated to become too low.
Would a high CO2 or low PO2 always need MV? Why or why not?
Nope.
CO2: Body can adjust to compensate for those levels.
O2: Can deliver O2 in a variety of ways that are more effective.
Where can mechanical ventilation be done? (6)
- Acute care settings in hospital env.
- Acute care (neonatal)
- Operating room
- Hospital specialty wards
- At home
- Long + Short term care facilities.
What must all modern ventilators be able to do?
- Deliver gas in controlled and supportive methods.
- Sense if patient wants to breathe and respond.
- Alarm if unsafe or out of range values detected.
Describe the difference between positive and negative pressure for powering MV.
(+): Pushes air into lungs via high gas pressures (50psig gas source).
(-): Pull air into lungs by creating external suction around the chest.
Differentiate how a spontaneously generated breath would differ from a positive pressure breath.
Spontaneous: Initiated by patient’s own resp. effort, and is (-) pressure in thoracic cavity.
(+) pressure: delivered entirely by ventilator, and pushes air into lungs using controlled, external force.
Broadly describe some examples of how spontaneous and positive pressure breaths may affect someone’s cardiovascular system.
Spontaneous: Natural breath, aids in venous return to heart (pulls blood back into heart efficiently).
(+): Ventilator affects blood flow within the lungs. Influences oxygenation and perfusion too.
