Quiz 2 Flashcards
How do you calculate how much is left in an oxygen tank?
2000 psi/660 L- solve for x
Ideal gas law
PV=nRT
Boyle’s law
volume inversely proportional to pressure (temp is constant)- think boil- temp
Charles’ Law
volume is proportional to temperature (pressure constant) -ex) when ETT cuff is heated, volume expands
Gay-Lussac’s law
pressure is proportional to temperature (volume is constant) ex) when cylinder is heated, pressure increases
Convert C to F
F=1.8C+32
Convert F to C
C=(F-32)/1.8
What are the 5 tasks of oxygen?
1) ventilator driving gas 2) flush valve 3) oxygen pressure failure alarm 4) oxygen pressure sensor shut off/fail safe 5) flowmeters
What should you do if O2 pipeline fails?
trust analyzer, turn off pipeline, turn on cylinder, make sure FiO2 increases (if not, use Ambu), use low flows, call for help, use IV anesthetics
How do you calculate FiO2?
Divide liters of O2 by total flow (subtract percent of inhaled agents)
How do you calculate compliance?
Change in volume/change in pressure (PIP-PEEP/tidal volume)
Mapleson E- T piece, no bag or APL valve
Mapleson F- no APL valve, can attach scavenger
Mapleson D- adds pressure generating valve, most efficient for controlled ventilation, may use for “down” lung during thoracic case
Mapleson C- not efficient
Mapleson A- most efficient for spontaneous ventilation, added expiratory limb
Mapleson B- long expiratory limb, not efficient, cannot ventilate apneic patient
