Nexfin noninvasive continuous blood pressure validated against Riva-Rocci/Korotkoff.
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.


CONCLUSIONS
Nexfin provides accurate measurement of BP with good within-subject precision when compared to RRK.
Eeftinck Schattenkerk
Daan W
DW
Special Medical Care, Department of Internal Medicine, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.
van Lieshout
Johannes J
JJ
van den Meiracker
Anton H
AH
Wesseling
Karel R
KR
Blanc
Stéphane
S
Wieling
Wouter
W
van Montfrans
Gert A
GA
Settels
Jos J
JJ
Wesseling
Karel H
KH
Westerhof
Berend E
BE
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001314:Auscultation; D001794:Blood Pressure / Q000502:physiology*; D001795:Blood Pressure Determination / Q000295:instrumentation / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic / Q000379:methods; D015203:Reproducibility of Results; D016683:Supine Position