CPAP Exam 2 Flashcards
Static Compliance formula
Change in Volume/Change in pressure
**Change in pressure is done by plateau pressure - Baseline Pressure
Definition of Airway Resistance and what the abbreviation is for formula
Amount of force required to push one liter of air into the lung in 1 second. Abbreviated as Raw
Airway Resistance Formula
Raw= { (PiP - Pause)/inspiratory flow rate } x 60
Minute ventilation abbreviation
vE
Tidal Volume abbrev
vT
Alveolar Ventilation
vA
Dead Space: Tidal Volume Ration Abbrev
vD/vT
1 Kilogram is equal to how many pounds?
1 Kg = 2.2 lbs
Normal Lung Compliance range
50-100mL/1cmH2O
Normal Raw range
0.5-1.5 or 0.5 to 2.5cmH2O/L/sec
Normal spontaneous ventilation does what to venous return to the heart
Increases the venous return to the right side of the heart
What is the term for the remaining air in the lungs at the end of passive exhalation?
Functional residual volume (FRC)
Eupnea
Normal spontaneous breathing
Hyperventilation
Breathing that results in DECREASED CO2 levels per ABG result
Kussmaul breathing
Deep, uniform continuous breaths as seen in diabetic ketoacidosis
Hyperapnea
Breathing at a larger volume than normal
ventilation
movement of gases between the atmosphere and the lung
Gradient
the pressure difference between two points
Driving pressure
pressure gradient moving gas from high to low pressure
ventilating pressures are always reads in what units?
psig or pressure on a gauge
barometric pressure
Force exerted by air (gases) that surround body
During inspiration, when does end-inspiration occur?
The pressure in thorax decreases until the pressures of the atm and alveoli are equal.
Movement/excursion of diaphragm during normal vs deep inspiration
Normal moves about 1.5cm while deep inspiration move 6-10cm
What does lung compliance evaluate?
the static characteristics of the lung
In a normal person, what two dead spaces should be equal to each other?
Anatomic and physiologic dead space.
ventilation without perfusion
Dead Space
If Raw is increased, what will the ventilatory pattern be?
Deep, and slower
If compliance is decreased, what will the ventilatory pattern look like?
Faster, shallow breaths
What is the normal ventilatory pattern of a pt?
RR and Tidal Volume make up a patient’s vent pattern. Normal is 15RR and 500mL tidal volume
What two forces make up surface tension
Surfactant/liquid-gas interface
What is the normal pressure at sea level?
760mmHg
During spontaneous breathing, on inspiration, what pressures change?
intra-alveolar and intra-pleural both DECREASE