Background: The Finapres methodology offers continuous measurement of blood pressure (BP) in a noninvasive manner. The latest development using this methodology is the Nexfin monitor. The present study evaluated the accuracy of Nexfin noninvasive arterial pressure (NAP) compared with auscultatory BP measurements (Riva-Rocci/Korotkoff, RRK). Methods: In supine subjects NAP was compared to RRK, performed by two observers using an electronic stethoscope with double earpieces. Per subject, three NAP-RRK differences were determined for systolic and diastolic BP, and bias and precision of differences were expressed as median (25th, 75th percentiles). Within-subject precision was defined as the (25th, 75th percentiles) after removing the average individual difference. Results: A total of 312 data sets of NAP and RRK for systolic and diastolic BP from 104 subjects (aged 18-95 years, 54 males) were compared. RRK systolic BP was 129 (115, 150), and diastolic BP was 80 (72, 89), NAP-RRK differences were 5.4 (-1.7, 11.0) mm Hg and -2.5 (-7.6, 2.3) mm Hg for systolic and diastolic BP, respectively; within-subject precisions were (-2.2, 2.3) and (-1.6, 1.5) mm Hg, respectively. Conclusion: Nexfin provides accurate measurement of BP with good within-subject precision when compared to RRK.

accuracy, adult, aged, article, blood pressure measurement, controlled study, diastolic blood pressure, female, heart auscultation, human, intermethod comparison, major clinical study, male, nexfin noninvasive continuous blood pressure, priority journal, riva rocci korotkoff, stethoscope, supine position, systolic blood pressure,
American Journal of Hypertension
Erasmus MC: University Medical Center Rotterdam

Eeftinck Schattenkerk, D.W, van Lieshout, J.J, van den Meiracker, A.H, Wesseling, K.R, Blanc, S, Wieling, W, … Westerhof, B.E. (2009). Nexfin noninvasive continuous blood pressure validated against Riva-Rocci/Korotkoff. American Journal of Hypertension, 22(4), 378–383. doi:10.1038/ajh.2008.368