Learning Cardiology

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 formu la 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.