Aortic Valve Pressure Half Time Calculator

Calculate Pressure Half Time



Formula

To calculate the Pressure Half Time (PHT):

\[ PHT = \frac{\ln(2)}{\ln \left( \frac{Pi}{Pf} \right)} \]

Where:

What is Aortic Valve Pressure Half Time?

Aortic valve pressure half time (PHT) is a measure used in echocardiography to assess the severity of aortic regurgitation. It is the time it takes for the peak pressure gradient across the aortic valve to decrease by half during diastole. A shorter PHT indicates more severe regurgitation, while a longer PHT suggests less severe regurgitation. This measurement helps in the evaluation and management of patients with aortic valve disease.

Example Calculation

Let's assume the following values:

Using the formula:

\[ PHT = \frac{\ln(2)}{\ln \left( \frac{120}{60} \right)} = \frac{0.693147}{\ln(2)} = \frac{0.693147}{0.693147} = 1 \text{ seconds} \]

The Pressure Half Time is 1 second.