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Introduction The ancient Greeks believed that the individual heart pumped an endless supply of "pneuma", or life energy. Galen, a Greek physician, believed that the "pneuma" and blood flowed in the heart like a fountain. He believed that there was an infinite supply of the valuable life source. It was not until 1616 that William Harvey decided that Galen was not entirely correct. Due to this custom of bloodletting during Harvey's time, his belief that blood is in fact finite wasn't warmly welcomed. (O’Brien) In 1733, the initial blood pressure was recorded when Reverend Stephen Hales attached a mix of glass and brass piping into a horse's artery. He noticed that upon releasing the ligature on the artery, the blood flowed through the pipes rising eight feet. Hales estimated that the blood pressure for individuals would climb seven and a half feet, which equated to a systolic pressure of 176 mmHg. A French doctor used Hales' method of inserting pipes into arteries to ascertain a more precise pressure of 120 mmHg by analyzing numerous patients before limb amputation. It was a somewhat invasive process for measuring blood pressure. Back in 1896, Riva Rocci developed a less invasive means of taking a individual's blood pressure. Rocci introduced the first mercury sphygmomanometer. The sphygmomanometer had an inflatable cuff that circled the individual's bicep, inflated to occlude the rectal artery until the radial pulse could no more be sensed by the health care staff carrying the readings. The mercury sphygmomanometer has undergone few changes from the past 100 years. With the exception of working with a stethoscope instead of palpating the radial pulse while utilizing the sphygmomanometer, using a bigger cuff, and substituting the mercury tube with a contemporary.