Oct 18, 2013

Blood Pressure

The first known experiment to measure the exact pressure of blood was performed by Stephen Hales on December 1, 1733. He took a live horse, attached a tube to her left crural artery, then allowed her blood to rush through the tube and it rose to a height of 8’3”.

He noted that “when it was at its full height, it would rise and fall at and after each pulse 2, 3,or 4 inches”. The horse bled out, but he performed the experiment on a horse that was about to be put down.