CO notes Flashcards
what is the most accurate way of finding co aka the gold standard
Fick
normal CO/perfusion rate
4-6 L/min
(120BSA)/(A-Vo2Hbg1.3610)
this is known as
fick
what is the o2 consumption in the fick formula
numerator
120*BSA
what is the average amount of adult consumption per BSA
120
What part of the fick formula represents O2 capacity
Hbg*1.36
what does the 10 represent for fick
conversion factor from dl tp L
what is the O2 content in the fick formula
(A-VO2)Hbg1.36
(A-VO2)Hbg1.36
O2 content
Hbg*1.36
1hbg can carry 1.36 g of O2=O2 capacity
what is sampled for Arterial sat and why
In a normal heart Ao because it’s the easiest to get to than LA because you don’t need to pierce the septum
in a normal heart what is sampled for Venous O2 sat and why
PA because it is the most mixed venous
the square root of height*weight divided by 3600 give you the
BSA
How many inches in a foot
12
how many cm in an inch
2.54
how many pounds in kg
2.2
What units do height and weight have to be in for BSA
cm and kg
If pt is on o2 how to sample o2 sat? if emphysema pt then what
take off of o2 for 10 mins, if emphysema, they must stay on o2 the entire time OR you can’t sample
O2 content was measured in two ways
Hood/box method measures O2 exhaled vs room O2
Douglas method Tissot spirometer measures o2 exhaled during exercise in a bag
O2 content is aka
Vol%
O2 carried in hbg
o2 content
O2 consumption is aka
uptake
normal O2 consumed
200-300ml
Normal AO2 content
20vol%
Normal VO2 content
15vol%
Normal A-VO2 difference
5vol%
Vol% is aka
A-VO2Hgb1.36
Ml’s of O2 per 100 mL’s
vol%
CO=HR(SV)
angiographic CO
SV/EDV=
EF
CO*(AVO2)=
O2 consumption
Normal range for CI
2-4
CO/BSA=
CI
SV/BSA=
SVI
120/(avo2)(Hbg)(1.36)(10)=
BSA
Normal range for BSA
2-3 M^2
what can you use to find BSA if not for the formula
DUbois
Thermodilution the smaller teh curve the better/worse the CO
better
Where does the injectate go for thermodilution
RA
where do you sample for thermodilution
5 times in the PA
what is the formula for thermodulition
Stewart hamilton
Taking CO 5 times and eliminating the highest and lowest while averaging out the remaining three is called
stewart hamilton
normal range for stroke volume
55-70%
what is larger the SV or ESV
ESV
EDV-ESV=
SV
EF*EDV=
SV
CO/HR=
SV
the outer line of an LV gram for angiographic CO represents
EDV
the inner line for LV gram for angiographic CO is known as
ESV
If you have a PDA/ASD where are you sampling AVo2
Vo2 IVC/SVC (flamm)
Ao2 AO
If you have an VSD what are you sampling
Vo2 RA
Ao2 AO
Pa sat=90 =AO=90
PDA/ASD
increase in RA RV and PA with the left side being normal means you have
ASD
elevated and RA=PA with left side being normal means you have a
VSD
Higher A-vo2 difference=
lower CO
lower CO=
HF
if CO of fick is greater than LVMF than you have a
MR
(1high IVC+3SVC)/4=
MVo2
what is the flamm formula
1ivc+3svc/4
what is used to find mixed venous o2 content when there is a left to right shunt
flamm formula
