What Is Dimensionless Index Aortic Valve?

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By Valerie Becker

The Dimensionless Index Aortic Valve: What You Need to Know

If you or a loved one has been diagnosed with aortic stenosis, you may have heard the term “dimensionless index” thrown around. But what exactly is this index and why is it important? In this article, we will explore the ins and outs of the dimensionless index aortic valve.

What is Aortic Stenosis?

Before we delve into the dimensionless index, let’s first understand what aortic stenosis is. Aortic stenosis is a condition where the aortic valve in the heart becomes narrowed, reducing blood flow from the heart to the rest of the body. This narrowing can cause symptoms such as chest pain, shortness of breath, and even fainting.

What is the Dimensionless Index?

The dimensionless index (DI) is a calculation used to determine how severe an individual’s aortic stenosis is. It compares the pressure gradient across the aortic valve (measured in millimeters of mercury or mmHg) to the left ventricular ejection time (measured in seconds or s). The formula for calculating DI is as follows:

DI = 4 × (peak velocity across valve)² / (LVOT VTI)

– LVOT VTI = left ventricular outflow tract velocity time integral

The DI calculation provides insight into how much pressure is required to push blood through the narrowed valve and how long it takes for that blood to be ejected from the heart.

What Does Your DI Value Mean?

A DI value less than 0.25 indicates mild aortic stenosis, while values between 0.25 and 0.40 suggest moderate stenosis. Values greater than 0.40 indicate severe aortic stenosis.

Why is DI Important?

DI is an important tool for doctors to determine the severity of an individual’s aortic stenosis and to make decisions about treatment options. Severe aortic stenosis may require surgical intervention, while mild or moderate cases may be managed with medication or monitoring.


In summary, the dimensionless index aortic valve is a calculation used to assess the severity of aortic stenosis. A DI value greater than 0.40 indicates severe stenosis and may require surgery, while values less than 0.25 indicate mild stenosis that can be monitored with medication. By understanding your DI value, you and your healthcare team can make informed decisions about treatment options and manage your condition more effectively.