title: Measurement accuracy of a stand-alone oscillometric central blood pressure monitor: a validation report for Microlife WatchBP Office Central.
abstract: BACKGROUND
  The superiority of prognostic value of blood pressure (BP) measured at central aorta (CBP) over conventional brachial BP measured by cuff-based BP monitors has reignited the development of new noninvasive techniques for estimating CBP. The present study validated the accuracy of CBP measured by a newly developed stand-alone CBP monitor.
  
  
  METHODS
  The CBP monitor provided readings of brachial systolic BP (SBP), brachial diastolic BP (DBP), central SBP, and central pulse pressure (PP). Brachial PP and central DBP were calculated from the relevant readings. The accuracy of the brachial and central SBP, PP, and DBP was validated against the simultaneously recorded invasively measured central aortic SBP, PP, and DBP, according to the invasive standard requirements for the noninvasive brachial BP monitors from the Association for the Advancement of Medical Instrumentation (AAMI) in 85 subjects (255 measurements; age range, 30-93 years).
  
  
  RESULTS
  The mean differences of cuff BP with reference to the invasively measured central SBP, PP, and DBP were -2.6 ± 9.0, -8.6 ± 11.2, and 6.1 ± 7.0 mm Hg, respectively, with the former two being obviously underestimated at high CBP and overestimated at low CBP. In contrast, the corresponding differences for the central SBP, PP, and DBP measured by the CBP monitor were -0.6 ± 5.5, -0.4 ± 7.0, and -0.2 ± 6.5 mm Hg, respectively, without obvious systematic bias. The distribution of measurement errors for central SBP, PP, and DBP surpassed the AAMI criteria.
  
  
  CONCLUSIONS
  Central SBP, PP, and DBP can be measured accurately by a stand-alone automatic BP monitor.
authors: The Joanna Briggs Institute, Faculty of Health Sciences, University of Adelaide, Australia.
authors: Hao-Min
authors: HM
authors: Cheng
authors: Shih-Hsien
authors: SH
authors: Sung
authors: Yuan-Ta
authors: YT
authors: Shih
authors: Shao-Yuan
authors: SY
authors: Chuang
authors: Wen-Chung
authors: WC
authors: Yu
authors: Chen-Huan
authors: CH
authors: Chen
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001011:Aorta / Q000502:physiology; D001794:Blood Pressure / Q000502:physiology; D001795:Blood Pressure Determination / Q000295:instrumentation* / Q000379:methods; D015924:Blood Pressure Monitors; D001916:Brachial Artery / Q000502:physiology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009991:Oscillometry / Q000295:instrumentation* / Q000379:methods