Formulas Flashcards
F Cardiac Output
CO = SV x HR
F BSA
ht(in) x wt(#)/3131 *0.5
ht(cm) x wt(kg)/3600 *0.5
Cardiac Index
CO/BSA
Wall motion score index.
(normal)
One
What is dP/dT used for? 
The velocity can indicate LV contractility
Reduced dP/dT suggests what?
reduced LV contractility
Three ways to measure LV systolic function?
- EF
– forward stroke volume
– LV dP/dT
What is the formula for stroke volume?
SV = CSA x VTI
CSA ▶️
= 3.14 x (D/2)2
= 3.14 x (r)2

Pulmonary systolic pressure
TR jet velocity + estimated RA pressure 
RV end-diastolic pressure
- can be estimated from the PR jet
– RV diastolic pressure calculated as 4V2
V = peak end diastolic velocity from Doppler regurgitation PR jet
Pulmonary vascular resistance - PVR/wood units
- can be estimated from peak TR velocity and VTI flow in RV outflow tract.
PVR = 10(VTR/VTIRVOT)
Pulmonary artery diastolic pressure
- RV diastolic pressure + RA pressure (IVC)
- (4V2 of PR jet)+RAP
Pulmonic volume flow rate.
(Qp)
Qp = VTIRVOT x CSARVOT
CSA
= 3.14(D/2)2
= 3.14(r)2
Systemic volume flow rate
(Qs)
Qs = VTILVOT x CSALVOT
CSA
= 3.14(D/2)2
= 3.14(r)2
Stroke volume formula
SV (L/min)= CSA x VTI
CSA = 3.14(r)2
CSA = 3.14(D/2)2
