Fig 1.
The oscillation pressure pattern reflects typical deduction points in blood pressure (BP) measurements.
With the first major oscillation marking the systolic (sys) BP, the amplitude further rises until the maximum peak (mean arterial pressure, MAP). The following decrease ends with the last major oscillation amplitude as the diastolic (dia) BP point.
Fig 2.
The oscillometric device assesses the brachial-ankle pulse wave velocity (baPWV) through the measurement of the transit time between the brachial artery and tibial artery through the oscillometric amplitude.
The determination of the carotid-femoral (cf) PWV results from the following calculation: cfPWV = 0.833 x baPWV -2.333 (m/s). The applanation tonometry device uses the tonometric technique with direct measurement of the cfPWV.
Table 1.
Study subject characteristics.
Fig 3.
Correlation of the ankle-brachial index (ABI) determined by Doppler and oscillometry in the overall population.
(A) High correlation between the ABI values determined by Doppler and oscillometry. (B) Bland–Altman plot of the agreement between the ABI values determined by Doppler and oscillometry.
Fig 4.
The oscillometric method (osc) shows advantages in terms of the time required per examination compared to the tonometric method (tono).
Shown is the required time per pulse wave velocity measurements, including the mean and standard deviation for 20 measurements each.
Fig 5.
The oscillometric (osc) and tonometric (tono) assessments of the carotid-femoral pulse wave velocity (cfPWV) show a good overall correlation.
The left graph shows the correlation between the cfPWV determined by both methods. The right graph shows the corresponding Bland–Altman plot of the agreement between tonometric and oscillometric assessments of the cfPWV.
Fig 6.
The oscillometric (osc) and tonometric (tono) assessments of the carotid-femoral pulse wave velocity (cfPWV) show a good correlation in the subgroups.
The results of the subgroup analysis of subjects without cardiovascular disease (A, CVD-free), with cardiovascular disease (B, CVD) and with peripheral artery disease (C, PAD) are demonstrated as Spearman’s rank correlation coefficients (left) and the corresponding Bland–Altman plots (right).