Showing posts with label Stephen Hales. Show all posts
Showing posts with label Stephen Hales. Show all posts

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.