CPAP Flashcards
what kind of pressure dose CPAP provide
positive end expiratory pressure,
what are the benefits of adding positive end expiratory pressure
increases the surface area of the alveoli and improvs v/q matching improving oxygenation
what is positive end expiratory pressure
the pressure in the alvioli above atmospheric pressure at the end of expiration
what dose CPAP increase
PEEP by having a set pressure in inspiration and expiration
how is pressure in CPAP pressured
H20, start with 5, increase to 10
what is the role of the L side of the heart
pump blood to the body
what is the role of the R side of the heart
receive blood from the body and pump it into the lungs
what happens if the L side of the heart stops working
fluid backs up into the lungs, then the RS of the heart has more force to overcome with each beat
how dose CPAP help an when the L side of the heart has failed
reduces venous return to the R side of the heart, thus the heart dose not have to contract as hard with each beat to push fluid through into the lungs
how dose CPAP reduce cardiac output
when CPAP is applied a pressure receptor inside the aorta (which supplies blood to the body) detects an increase in intrathoracic pressure, this tells the heart there is too much pressure and to relax a little, leading to a decrease in Q (as well as a drop in venous return)
CPAP indications
Cardiogenic pulmonary oedema with moderate to severe respiratory distress, or
Asthma, COPD, or undifferentiated respiratory problem with severe respiratory distress that is not improving with treatment, or
An SpO2 of less than 92% due to a respiratory problem despite treatment (less than 88% if COPD or known chronic hypoxia).
CPAP contraindications
Active vomiting, or
Ineffective breathing.
CPAP cautions
An altered level of consciousness, or
Signs of shock, or
Clinical suspicion of pneumothorax.
pressure to start CPAP on
start with 5 then increase to 10, if not working can increase to a max of 15
complications of CPAP
-not tolerated well
-dry oral and eye mucosa
