1. Anesthesia Machine Flashcards
ASA mandated monitored levels
oxygenation
ventilation
circulation
temperature
blood pressure
pressure exterted by blood aginst the interior walls of blood vessels
sytolic pressure
systole
diastolic pressuyre
diastole
why is BP monitoring important
how we measure whether or not the patient is being adquately perfused
normal BP
120/80 mmhg
hypertenstion
> = 140/90 mmhg
high bp
hypotension
<= 90/60 mmhg
low bp
mean arterial pressure
the avg pressure in a patients arteries during one cardiac cycle
mean arterial pressure calculation
MAP = [(2*diastolic BP)+Systolic BP]/3
normal MAP
70-100 mmHG
pulse pressure
systolic pressure minus diastolic pressure
S-D
normal pulse pressure
30-40mmHG
ECG measures
heart rhythm
normal HR
60-100
tachycardia
> 100
high HR
bradycardia
<60
low HR
pulse oximetry
SpO2
percentage of heme saturated w/O2
“oxygen saturation”
normal SpO2
93-98% (on room air)
end tidal CO2
EtCO2
amount of CO in expired air
normal EtCO2
35-45mmHg
capnograph (EtCO2) monitor functions
reveals pts EtCO2
reveals pts RR
respiratory rate
RR
spontaneously breathing RR
12-20 breaths per min
increase pain
increase RR
narcotics
decrease RR
normal RR on ventilator
8-12 breaths per min
ventilator RR is slower than spntaneous because
ventilator tidal volumes are largert than spontaneous tidal volumes
room temp
23 C
core body temp
36-38C
purposes of anesthesia machine
- Positive pressure ventilation (PPV)
- anesthetize pt w/inhaled anesthetic gas
2 types of anesthetic gases
volatile agents
fresh flow gasses
volatile agents
keep pts anesthetized during surgery
stay asleep
types of volatile agents
sevo
des
iso
fresh gas flow types
O2
air
NO2
fresh gas flow
picks up and delivers volatile agent to the pt
O2 (fresh flow gas)
higher FiO2 compensates for atelectasis
some pts (lung pathology) need higher FiO2 to have adquate O2 saturation
higher FiO2 allows patient to mx adequate O2 saturation for longer periods during unexpected apnea
NO2 (Fresh flow gas)
only anesthetic gas that has analgesic properties
allows anesthetist to use lower concentrations of volatile agent
Air (fresh flow gas)
too much oxygen for too long can be toxi
higher FiO2 can cause absorption atelectasis
FiO2 above 30% and/or NO2 increase risk of airway fire
wall supply pressure
50psi
pt gas pressure
16psi
Diameter index safety system
DISS
prevents NO2 from connecting to O2 line for wall connections
Pin Index safety system
PISS
prevents connecting machine to worng gas tank
Flowmeter mechanical proportioning system
built in system that limits the % of NO2 that can be given to a pt
max NO2:O2 ratio
3:1
75% NO2
25% O2
Low pressure pathway order
Flowmeters
Common Manifold
Vaporizers
Fresh gas outlet
Inspiratory tubing
Patient
Expiratory tubing
Rebreathing bag/vent
CO2 absorber/APL valve
Exhaled gas joins fresh
rebreathing
pt rebreathes their own exhaled gas
circle system
new fresh flow is contantly added
pt continually rebreathes gas they exhale
rebreathing causes pressure to
increase