Formulas Flashcards
Regurgitant fraction
SV (angio) - SV (thermo) ---------------------------- SV (angio) Or CO (angio) - CO (thermo) ----------------------------- CO(angio)
Formula for blood pressure
Heart rate X stroke Volume X SVR
Ejection fraction
EDV-ESV/EDV
Stroke volume
EDV - ESV
Angiographic cardiac output
SV (ml) x HR/ 1000
Cardiac index
CO/BSA
AVF. Aortic valve flow
SEP (Sec/min)
What is the gorlin formula aortic valve constant
44.5
AVA. Aortic valve area
AVF
- 5 x square root of mean gradient
Haaki formula for valve area
Square root of the peak to peak lv AO pressure gradient.
What is the mitral valve gorlin constant?
37.7
Systemic blood flow SBF
Systemic arterial 02 - MO2 content x10
(RAo2 or RVo2) is MO2
How do you convert hybrid resistance units to absolute resistance unit
Multiply by 80
Pulmonary blood flow (PBF)
Pulmonary venous o2 - pulmonary artery o2 x 10
Calculate Qp/Qs ratio
(PV o2 - PA o2)
(PVR)
PBF X 80
PBF = CO as long as ther isn’t a shunt
Fick Cardiac Output
VO2 /
(hgb x AO sat x constant)-(hgb x PA sat x constant) x 10
Systolic vascular resistance
SBF. X 80
SBF = CO as long as there isn’t a shunt
What is resistance
The Amount of work necessary to push blood out of the systemic or pulmonary systems
SEP systolic ejection period
The amount of time the AO valve is open for blood to be ejected out of the Aortic valve
DFP. diastolic filing period
Amount of time the mitral valve leaflets are open for blood to eject out.
If the shunted blood flow is a negative number, does that indicate a R-L shunt or L-R shunt
R-L shunt
