Determination of central blood pressure by a noninvasive method (brachial BP and QKD interval)

Antoine Cremer*, Mark Butlin, Léopold Codjo, Paul Coulon, Xavier Ranouil, Cédric Joret, Pierre Coste, Roland Asmar, Alberto Avolio, Philippe Gosse

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    12 Citations (Scopus)


    Background: The measurement of central blood pressure (BPc) has become a matter of importance. Several therapeutic trials have noted a different protective effect against cardiovascular complications with different antihypertensive strategies, but an identical decrease in brachial BP (BPb). A possible explanation lies in the different effects of the treatments on BPc. We propose a new noninvasive method for the automatic measurement of BPc based on the QKD interval, an arterial stiffness marker. Materials and Methods: This study was carried out on patients referred for cardiac catheterization. We simultaneously measured the central SBP (SBPc) invasively with a pigtail probe, and the BPb by a cuff coupled with recording of the QKD interval. Two cohorts were studied, one to define an algorithm of SBPc estimation and one to validate this algorithm. Results: The first cohort included 65 patients. We performed 136 simultaneous measurements. In the multivariate analysis, four variables were significantly correlated with SBPc: mean BPb (mBPb), QKD, height and heart rate (HR) with the following regression equation: SBP = 105 + 1.29 × mBPb-0.39 × HR-0.30 × height-0.11 × QKDThis equation estimated 81% of the variance of the invasive SBPc±13mmHg. This algorithm was then tested in another cohort of 80 patients. Difference between measured and estimated SBPc was 2±14mmHg. Conclusion: This study showed that it is possible to estimate SBPc by simultaneous measurement of QKD and BPb. If further studies confirm these results, a noninvasive ambulatory method of monitoring of SBPc could be employed in clinical practice.

    Original languageEnglish
    Pages (from-to)1533-1539
    Number of pages7
    JournalJournal of Hypertension
    Issue number8
    Publication statusPublished - Aug 2012


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