Central Arterial pressure and Cardiovascular Safety
The sphygmomanometer has been used for over 100 years to measure the systolic and diastolic blood pressures in the brachial artery. D. Winter at AtCor Medical Inc. explained how blood pressure in the brachial artery can be very different from the pressure at the heart.
 
http://jforcs.com/jcs/wp-content/uploads/2013/10/Central-Arterial….pdf