Blood Pressure Blood pressure is the pressure exerted by the blood on the walls of the blood vessels. Unless indicated otherwise, blood pressure is understood to mean arterial blood pressure, i.e. the pressure in the large arteries, such as the brachial artery (in the arm). The pressure of the blood in other vessels is lower than the arterial pressure.
Invasive Blood Pressure Invasive Blood Pressure, a means of measuring blood pressure internally, using a probe inserted into a blood vessel.
Segmental Blood Pressure Segmental blood pressure is used to measure actual limb pressures. The purpose of these measurements is to look at arterial occlusion.
In the lower extremity pressures are measured at the ankle, below the knee, above the knee and mid-thigh. In the upper extremity pressures are measured at the wrist, below the elbow, above the elbow and mid upper arm.