Comparison of non-invasive blood pressure monitoring using modified arterial applanation tonometry with intra-arterial measurement

Jarkko Harju, Antti Vehkaoja, Pekka Kumpulainen, Stefano Campadello, Ville Lindroos, Arvi Yli-Hankala, Niku Oksala

    Research output: Contribution to journalArticleScientificpeer-review

    16 Citations (Scopus)


    <p>Intermittent non-invasive blood pressure measurement with tourniquets is slow, can cause nerve and skin damage, and interferes with other measurements. Invasive measurement cannot be safely used in all conditions. Modified arterial tonometry may be an alternative for fast and continuous measurement. Our aim was to compare arterial tonometry sensor (BPro<sup>®</sup>) with invasive blood pressure measurement to clarify whether it could be utilized in the postoperative setting. 28 patients who underwent elective surgery requiring arterial cannulation were analyzed. Patients were monitored post-operatively for 2 h with standard invasive monitoring and with a study device comprising an arterial tonometry sensor (BPro<sup>®</sup>) added with a three-dimensional accelerometer to investigate the potential impact of movement. Recordings were collected electronically. The results revealed inaccurate readings in method comparison between the devices based on recommendations by Association for the Advancement of Medical Instrumentation (AAMI). On a Bland–Altman plot, the bias and precision between these two methods was 19.8 ± 16.7 (Limits of agreement − 20.1 to 59.6) mmHg, Spearman correlation coefficient r = 0.61. For diastolic pressure, the difference was 4.8 ± 7.7 (LoA − 14.1 to 23.6) mmHg (r = 0.72), and for mean arterial pressure it was 11.18 ± 11.1 (LoA − 12.1 to 34.2) mmHg (r = 0.642). Our study revealed inaccurate agreement (AAMI) between the two methods when measuring systolic and mean blood pressures during post-operative care. The readings for diastolic pressures were inside the limits recommended by AAMI. Movement increased the failure rate significantly (p <0.001). Thus, arterial tonometry is not an appropriate replacement for invasive blood pressure measurement in these patients.</p>
    Original languageEnglish
    Pages (from-to)13–22
    Number of pages10
    JournalJournal of Clinical Monitoring and Computing
    Issue number1
    Publication statusPublished - 2018
    Publication typeA1 Journal article-refereed


    • Arterial pressure
    • Blood pressure monitors
    • Monitoring, intraoperative
    • arterial pressure
    • blood pressure monitors
    • intraoperative
    • monitoring

    Publication forum classification

    • Publication forum level 1


    Dive into the research topics of 'Comparison of non-invasive blood pressure monitoring using modified arterial applanation tonometry with intra-arterial measurement'. Together they form a unique fingerprint.

    Cite this