title: Systolic peak foot-to-apex time interval, a novel oscillometric technique for systolic blood pressure measurement.
abstract: Noninvasive blood pressure (BP) measurement is essential for the study of human physiology but automatic oscillometric devices only estimate SBP and DBP using various, undisclosed algorithms, precluding standardization and interchangeability. We propose a novel approach by tracking, during pneumatic cuff deflation, the time interval from the foot to the apex of the systolic peak of the oscillometric signal, which reaches a maximum concomitant with the first Korotkoff sound.
  
  
  
  In 145 study participants and patients (group 1), we measured the systolic brachial artery blood pressure by Korotkoff sound recording, conventional oscillometry, and our fully automated systolic peak foot-to-apex time interval (SFATI) technique. In 35 other patients (group 2), we compared SFATI with intra-arterial measurement.
  
  
  
  In group 1, the concordance correlation coefficient was 0.989 and 0.984 between SFATI and Korotkoff sounds, 0.884 and 0.917 between oscillometry and Korotkoff sounds, and 0.882 and 0.919 between SFATI and oscillometry, respectively, on the left and right arm. In group 2, it was 0.72 between SFATI and intra-arterial measurement, 0.67 between oscillometry and intra-arterial measurement, and 0.92 between SFATI and Korotkoff sounds. In 40 study participants, the reproducibility study yielded a concordance coefficient of 0.95 for SFATI and 0.94 for Korotkoff sounds.
  
  
  
  SFATI BP measurement shows an excellent concordance with the auscultatory technique, offering a major improvement over current oscillometric techniques and allowing standardization.
authors.affiliation: aVascular Medicine and Laboratory, Nîmes University Hospital, Nîmes, France bBiomedical Engineering Laboratory, Faculty of Technology, Aboubekr Belkaid University, Tlemcen, Algeria cResearch Unit (Female characteristics of dysfunctions of vascular interfaces), Montpellier University, Montpellier, France.
authors.forename: Amir M
authors.initials: AM
authors.lastname: Benmira
authors.forename: Antonia
authors.initials: A
authors.lastname: Perez-Martin
authors.forename: Sarah
authors.initials: S
authors.lastname: Coudray
authors.forename: Iris
authors.initials: I
authors.lastname: Schuster
authors.forename: Isabelle
authors.initials: I
authors.lastname: Aichoun
authors.forename: Jérémy
authors.initials: J
authors.lastname: Laurent
authors.forename: Fethi
authors.initials: F
authors.lastname: Bereski-Reguig
authors.forename: Michel
authors.initials: M
authors.lastname: Dauzat
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000465:Algorithms; D001794:Blood Pressure; D001795:Blood Pressure Determination / Q000379:methods*; D001916:Brachial Artery; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009991:Oscillometry; D012015:Reference Standards; D015203:Reproducibility of Results; D013599:Systole; D055815:Young Adult