title: Determinants of the second derivative of the finger photoplethysmogram and brachial-ankle pulse-wave velocity: the Ohasama study.
abstract: BACKGROUND
  We examined different characteristics of the second derivative of the finger photoplethysmogram (SDPTG) and brachial-ankle pulse wave velocity (BAPWV) for assessing arterial function in a large general population, along with the alteration of SDPTG in hypertension.
  
  
  METHODS
  Finger SDPTG and BAPWV were measured in 848 (544 normotensive and 304 untreated hypertensive) subjects 34 to 88 years of age. For assessing SDPTG, we calculated the B:A and D:A ratios and the aging index (AGI), based on the height of the wave components. Using univariate and multivariate analyses, determinants of SDPTG indices and BAPWV as well as differences between normotensive and hypertensive subjects were evaluated.
  
  
  RESULTS
  We found that BAPWV was independently and positively correlated with age, blood pressure (BP), heart rate (HR), and hemoglobin A1c. The D:A ratio and AGI showed a positive and the B:A ratio a negative independent correlation with age and BP. In contrast, the D:A ratio and AGI showed a negative and the B:A ratio a positive correlation with HR. The SDPTG indices, but not BAPWV, were independently associated with gender. The multivariate-adjusted D:A ratio, AGI, and BAPWV were significantly higher and the adjusted B:A ratio was lower in hypertensive than in normotensive subjects, and hypertensive subjects showed two-fold greater adjusted risks of having high D:A and low B:A ratios. The SDPTG indices and BAPWV were mildly correlated with each other in normotensive but not in untreated hypertensive subjects.
  
  
  CONCLUSIONS
  Although the SDPTG depends on various factors in a manner different from BAPWV, it may be useful for detecting vascular aging accelerated by hypertension.
authors.affiliation: Department of Planning for Drug Development and Clinical Evaluation, Tohoku University Graduate School of Pharmaceutical Science and Medicine, Sendai, Japan. hashij@mail.tains.tohoku.ac.jp
authors.forename: Junichiro
authors.initials: J
authors.lastname: Hashimoto
authors.forename: Daisuke
authors.initials: D
authors.lastname: Watabe
authors.forename: Atsushi
authors.initials: A
authors.lastname: Kimura
authors.forename: Hisaki
authors.initials: H
authors.lastname: Takahashi
authors.forename: Takayoshi
authors.initials: T
authors.lastname: Ohkubo
authors.forename: Kazuhito
authors.initials: K
authors.lastname: Totsune
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Imai
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000842:Ankle / Q000098:blood supply*; D001783:Blood Flow Velocity; D001916:Brachial Artery / Q000503:physiopathology*; D016022:Case-Control Studies; D003430:Cross-Sectional Studies; D005260:Female; D005385:Fingers / Q000098:blood supply*; D006801:Humans; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D017156:Photoplethysmography; D011674:Pulse