LifePulsePro+ diagnostic system
Pulse wave velocity module
Pulse Wave Velocity (PWV) is a measure of arterial stiffness, or
the rate at which pressure waves move down the vessel.
As blood flows through the vessels of the circulatory system, it
moves out of the left ventricle and into the aorta where it is then pushed through the rest of the
circulatory system. During systole, the contraction of the left ventricle and the ejection of blood
into the ascending aorta acutely dilates the aortic wall and generates a pressure wave that moves
along the arterial tree. The velocity of this movement gives a measurement of arterial compliance.
With age, or due to changes in the arterial wall, these vessels become stiffer and the speed at which
the pressure wave moves through the system is increased.
PWV can be collected by using two pulse sensors placed a known distance from one another,
referred to as the Pulse Wave Distance. The time it takes the pressure wave to go from the
upstream pulse sensor 2 to the downstream pulse sensor 1 provides the Pulse Transit Time (PTT).
PWV can then be calculated by dividing the distance by the transit time providing a measure of
Two pulse sensors are used to measure the pulse wave velocity.
One sensor is put on the finger, the other sensor is attached to the patient's earlobe.
The PWVsoftware module monitors and records pulse waves from both sensors in real time. At the same time, the delay in the
passage of the pulse wave through the vessels is measured (in milliseconds).
Several measurements are made automatically and the average value of the time difference between the pulse wave amplitudes at
two measurement points is calculated.
After that, the patient's HEIGHT is entered in the dialog box and the pulse wave velocity is calculated, as well as the conclusion is visualized.
Some screenshots of the software module are presented below:
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