Equations

Question 1

Stroke Volume

Answer 1

SV = LVOT CSA x LVOT VTI

Question 2

SV Index

Answer 2

SVI = SV/BSA

Question 3

Cardiac Output

Answer 3

CO = SV x HR

Question 4

Cardiac Index

Answer 4

CI = CO/BSA

Question 5

Qp/Qs

Answer 5

Qp/Qs = (RVOT CSA x RVOT VTI)/(LVOT CSA x LVOT VTI)

Question 6

RVSP

Answer 6

RVSP = 4 x (max TR velocity)2 + RAP

Question 7

PASP

Answer 7

If no PS: PASP = RVSP
If PS: PASP = RVSP - PS gradient

Question 8

PADP

Answer 8

PADP = RV diastolic pressure (RAP) + PR gradient
PADP = PR end diastolic pressure gradient + RA pressure

Question 9

Mean PAP

Answer 9

Mean PAP = 0.6 x (PASP + 2)
Mean PAP = peak PR gradient + RAP

Question 10

PVR

Answer 10

PVR = 10(TR velocity/RVOT VTI) + 0.16

Question 11

LVSP

Answer 11

If no AS: LVSP = SBP
If AS: LVSP = SBP + AS gradient

Question 12

LVEDP

Answer 12

LVEDP = Aortic Diastolic Pressure - (AR EDV)2 x 4

Use 70% of peak AR EDV gradient

Question 13

LAP

Answer 13

LAP = E/e’ + 4

Question 14

RVSP in VSD

Answer 14

RVSP = SBP - Peak Systolic VSD gradient

Question 15

ASD Stroke Volume

Answer 15

ASD SV = CSA of VSD x VTI of ASD

Question 16

ASD Shunt Flow

Answer 16

ASD Shunt Flow = ASD SV x HR

Question 17

Mean LAP

Answer 17

LAP = Mean mitral gradient in diastole + early LV diastolic pressure

Question 18

LAP in ASD with L -> R shunt

Answer 18

LAP = peak trans-ASD gradient + RAP

Question 19

PASP in PDA

Answer 19

PASP = SBP - peak systolic PDA gradient