Journal
JOURNAL OF HYPERTENSION
Volume 26, Issue 10, Pages 1993-2000Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/HJH.0b013e328309ee4c
Keywords
ambulatory arterial stiffness index; ambulatory blood pressure monitoring; arterial stiffness; diurnal blood pressure profile; reproducibility
Categories
Funding
- European Union [IC15-CT98-0329-EPOGH, LSHM-CT-2006-037093 InGenious HyperCare, HEALTH-2007-201550 HyperGenes]
- Fonds voor Wetenschappelijk Onderzoek Vlaanderen
- Ministry of the Flemish Community, Brussels, Belgium [G.0424.03, G.0453.05, G.0575.06]
- University of Leuven, Belgium [OT/99/28, OT/00/25, OT/05/49]
- Dutch Heart Foundation, Den Haag, The Netherlands
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Background We studied the repeatability of the ambulatory arterial stiffness index (AASI), which can be computed from 24-h blood pressure (BP) recordings as unity minus the regression slope of diastolic on systolic BP. Methods One hundred and fifty-two hypertensive outpatients recruited in Nijmegen (mean age = 46.2 years; 76.3% with systolic and diastolic hypertension) and 145 patients enrolled in the Systolic Hypertension in Europe (Syst-Eur) trial (71.0 years) underwent 24-h BP monitoring at a median interval of 8 and 31 days, respectively. We used the repeatability coefficient, which is twice the SD of the within-participant differences between repeat recordings, and expressed it as a percentage of four times the SD of the mean of the paired measurements. Results Mean AASI (crude or derived by time-weighted or robust regression) and 24-h pulse pressure (PP) were similar on repeat recordings in both cohorts. In Nijmegen patients, repeatability coefficients of AASI and PP were similar to 50%. In Syst-Eur trial patients, repeatability coefficient was similar to 60% for AASI and similar to 40% for PP. For comparison, repeatability coefficients for 24-h systolic and diastolic BP were similar to 30%. Differences in AASI between paired recordings were correlated with differences in the goodness of fit (r(2)) of the AASI regression line as well as with differences in the night-to-day BP ratio. However, in sensitivity analyses stratified for type of hypertension, r(2), or dipping status, repeatability coefficients for AASI did not widely depart from 50 to 60% range. Conclusion Estimates of mean AASI were not different between repeat recordings, and repeatability coefficients were within the 50-60% range.
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