Put simply: if you take a “T” shaped pipe and pass a fluid (such as air or water) through the straight section, a vacuum will be created on the shorter side due to the Venturi effect.

When you're filling up at the gas station, have you ever wondered how the gas pump knows when to shut off? Hint: It's not ...

The Venturi effect is described as a decrease in pressure when blood flows through a stenosis at a high velocity. This relates to the hemodynamics in hypertrophic obstructive cardiomyopathy (HOCM).