# What is the Gorlin equation?

## What is the Gorlin equation?

The Gorlin equation states that the aortic valve area is equal to the flow through the aortic valve during ventricular systole divided by the systolic pressure gradient across the valve times a constant.

**What is Hakki equation?**

The Hakki equation is a simplified version of the Gorlin equation, which relied on the observation that the product of the heart rate, systolic ejection period, and constant is often approximately 1,000 8 : aortic valve area (cm 2 ) = cardiac output (L/min)/√gradient (mm Hg).

**How is EOA calculated?**

EOA of the aortic valve was calculated from the continuity equation – EOA = CSALVOT × (LVOTVTI ÷ AoVTI) -, where EOA is in cm2, LVOTVTI is the subaortic velocity -time integral and AoVTI is the aortic velocity-time integral both in cm.

### What is the continuity equation aortic valve?

The principle of continuity (the continuity equation) states that the volume of blood passing the mitral valve must be equal to the volume passing the aortic valve. Stroke volume, the amount of blood ejected into the aorta, is calculated by measuring the area and VTI in the LVOT: SV = areaLVOT • VTILVOT.

**What is normal aortic valve peak gradient?**

Aortic Valve Peak Gradient. Normal Gradient < 2 mmHg.

**How is Lvot area calculated?**

Results obtained were compared to those calculated by continuity equation using to the conventionally determined LVOT area (a = pi [d/2]2).

#### How do you calculate cardiac output on a calculator?

If a person has a heart rate of 70 beats/min and a stroke volume of 70mL/beat, what is the cardiac output of this individual? So based on the values of the parameters, we use the equation CO= HR * SV and substitute in the values into the equation.

**What is aortic EOA?**

The aortic valve effective orifice area (EOA) is the. minimal cross-sectional area of the flow jet, ie, the. cross-sectional area of the vena contracta, down- stream of a native or bioprosthetic aortic heart valve.

**Is EOA the same as Ava?**

Continuity Equation: AVA It evaluates the highest gradients across the valve to determine the effective orifice area (EOA). Due to fluid dynamics, higher gradients of a stenotic valve will occur post-valve (downstream) at the narrowest portion of jet flow, this is the location of the EOA.

## What is a normal aortic valve gradient?

Aortic Valve Mean Gradient. Normal Area 4.0-6.0 cm2.