Page 65
Art. no.: 2.511076 Rev.: g
BR-102 plus PWA 9
User Guide Overview 9.1
BR-102 plus / BR-102 plus PWA
9 BR-102 plus PWA
9.1 Overview
The clinical usefulness of central blood pressure (BP) as an index of
risk for cardiovascular disease and the augmentation index (AIx) is
often cited with relation to sex, age and heart rate. Arterial stiffness is
an important determinant of cardiovascular risk and the augmentation
index (AIx) is a measure of wave reflection and thus systemic arterial
stiffness derived from the ascending aortic pressure waveform.
The central arterial pulse wave is the sum of the forward pressure
wave generated by left ventricular ejection and a backward
propagating wave that is subsequently reflected from the peripheral
site. The time point at which these forward and backward propagating
waves merge and the amplitude of the reflected (backward) wave
affect the level of central BP.
9.2 Measurements
After every BP measurement, the cuff is again inflated to the diastolic
pressure and held for 10 seconds while PWA data is obtained (see
BR-102 plus PWA Unit Measurements, page 43).
9.3 Display of Pulse Wave Analysis
Pulse wave analysis is based on arterial blood pressure curve
containing haemodynamic information that exceeds peripherally
measured blood pressure. This is used to analyse the central aortic
pulse wave. The medilogDARWIN2 displays the following values:
• Central blood pressure
• Central pulse pressure
• Augmentation pressure
• Augmentation index
• Alx@75 [90% confidence interval]
• Peripheral resistance
• Pulse Wave Velocity [PWV]
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