Fig 1.
Schematic diagram of testing configuration for NIBP oscillometric monitors using the Fluke BP NIBP Analyser.
Fig 2.
Development of Oscillometric Waveform Envelope (OMWE) and determination of characteristic points Rs, and Rd with SBP and DBP points set at 120/80 mm Hg.
Fig 3.
Sample blood pressure record (Panels A-D) from reference database and derived OMWE (Panel E). The vertical dashed lines points to the SBP at which the first Korotkoff sound appears.
Table 1.
Determination of characteristic ratios Rs and Rd from Fluke Analyser for six NIBP devices using cubic splines to form the OMWE.
Fig 4.
Bland-Altman plots comparing oscillometric estimates of systolic pressure using the characteristic ratio of Rs = 0.565, against reference auscultatory systolic pressure.
Table 2.
Bland Altman statistics and BHS classification for a range of values of Rs.
The row labelled ALG gives the results obtained using an automated algorithm.