**In modified Bernoulli equation (P = 4V ²), from where did the number 4 came ?**

Bernoulli equation is the most critical equation on which the foundation of clinical Doppler echocardiography is built. Bernoulli equation tells about fluid mechanics. Bernoulli’s principle states that the sum of potential and the kinetic energy of a fluid per unit volume flowing through a tube is constant.
A more detailed explanation regarding Bernoulli equation is linked in this video
Applying Bernoulli in Echocardiography
So, if we can somehow measure the velocity gained across a point inside the heart we can deduce the pressure gradient. Here comes the Doppler principle that helps us calculate the velocity...

**Source: **Dr.S.Venkatesan MD - February 20, 2020 **Category: **Cardiology **Authors: **dr s venkatesan **Tags: **Uncategorized .Bernoulli equation in echocardiography 4 is the constant in modified bernouli equation from doppler and bernouli mass of blood vs density of blood what is four in Bernoulli equation **Source Type: **blogs