MCQ 2: Gorlin's formula

Q. Gorlin’s formula requires all of the following to calculate aortic valve area in aortic stenosis patient except?

a. Cardiac output

b. Pulmonary capillary wedge pressure

c. Heart rate

d. Systolic ejection period

Answer: Option b

Gorlin's formula to calculate aortic valve area

Aortic valve area= CO / {SEP x HR x 44.3(MG)^1/2}

Where,

CO= Cardiac output

SEP= Systolic ejection period

HR= Heart rate

MG= Mean pressure gradient

Simplified Hakki’s formula for calculation of aortic valve area

Aortic valve area= CO / (MG)^1/2

Where,

CO= Cardiac output

MG= Mean pressure gradient

Note: Peak gradient can also be used in place of mean gradient in case of Hakki's equation.