Equations

Question 1

MVA by Pressure Half Time

Answer 1

MVA = 220/PHT

Question 2

Pressure Half Time

Answer 2

PHT = 0.29 x Deceleration Time

Question 3

MVA PISA

Answer 3

MVA = 2π(PISA radius)2 x aliasing velocity/peak MV velocity x angle/180

Question 4

MVA Continuity

Answer 4

MVA = LVOT CSA x LVOT VTI/MV VTI

Question 5

MR Regurgitant Flow

Answer 5

RF = 2π(PISA radius)2 x aliasing velocity

Question 6

MR EROA

Answer 6

EROA = 2π(PISA radius)2 x aliasing velocity/ peak MR velocity x angle/180
EROA = MR Volume/MR VTI

Question 7

MR Regurgitant Volume

Answer 7

RV = EROA x MV VTI
RV = MV Stroke Volume - LVOT Stroke Volume

Question 8

AVA Continuity

Answer 8

AVA = LVOT CSA x LVOT VTI/AV VTI

Question 9

AV Dimensionless Index

Answer 9

DI = LVOT VTI/AV VTI

Question 10

AR Regurgitant Flow

Answer 10

RF = 2π(PISA radius)2 x aliasing velocity

Question 11

AR EROA

Answer 11

EROA = RF = 2π(PISA radius)2 x aliasing velocity/Peak Velocity AR

Question 12

AR Regurgitant Volume

Answer 12

RV = EROA x AR VTI

Question 13

AR Regurgitant Fraction

Answer 13

RF = (RV/Aortic SV) x 100