Central aortal pressure
The central (aortal) blood pressure is indicated by a pair of values, systole and diastole, just like the brachial blood pressure. The systole marks the first and highest point on the pressure pulse curve, whereas the diastole indicates the lowest value. The blood pressure in the aorta of a healthy person is usually slightly lower than that in the brachialis (arm). In comparison to brachial blood pressure measurement, central blood pressure has a better correlation to hypertensive organ damage in addition to a more precise diagnosis of blood pressure behaviour. When measuring the brachial blood pressure alone, it remains undiscovered whether the central blood pressure is also or even exclusively elevated.
The augmentation index describes the ratio of augmentation pressure to pulse pressure. The main influencing factor is the arterial stiffness of the entire arterial system, because the more pronounced this is, the faster and more strongly the pressure wave is reflected back to the heart.
Augmentation means the increase of the pressure wave in systole by the reflected part of the pulse wave. The augmentation pressure is the fraction of the pulse pressure caused by the reflected wave.
Pulse Wave Velocity
Central (aortal) pulse wave velocity
Pulse wave velocity is the average velocity of the arterial pulse wave measured along a specific arterial segment. The central PWV describes the velocity in the segment from the aorta ascendens to the bifurcation.
Determination of the functional age of the arteries of the person to be examined on the basis of the characteristic properties of actual pulse waves. This includes both the effects of an existing medication and current factors such as water balance or current stress levels.