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Canadian Journal of Anesthesia

, Volume 46, Issue 5, pp 488–496 | Cite as

Accuracy of radial artery blood pressure determination with the Vasotrac™

  • Kumar G. Belani
  • Joseph J. Buckley
  • Marius O. Poliac
Equipment

Abstract

Purpose

To evaluate the accuracy of a new non-invasive method (Vasotrac™) to measure blood pressure (BP) with accompanying arterial wave-form and pulse-rate display when compared with BP and waveform measured invasively.

Methods

Healthy volunteers (n=53) served as subjects for the study. Blood pressures and waveforms obtained via a radial artery catheter (IABP) were compared with non-invasive measurements obtained every 12–15 beats by the new system (Vasotrac BP) from the opposite radial artery. In a sub-group of volunteers (n= 11), BP was acutely increased and decreased with isoproterenol, phenylephrine and sodium nitroprusside. Data were analyzed by determining correlation and agreement between the two systems of measurement. Waveforms obtained by the two systems were qualitatively examined.

Results

Non-invasive BP measured every 12–15 beats by the Vasotrac correlated with IABP (systolic r2 = 0.89; diastolic r2 = 0.88; mean r2 = 0.94). The actual values obtained by the two methods agreed closely with > 90% of readings being within 2SDs when plotted by the Bland Altman method. This was also true during vasoactive drug infusion when BP changed acutely and swiftly. During this dynamic period, Vasotrac BP accurately tracked the changes in IABP with correlations (systolic r2= 0.82; diastolic r2 = 0.89; mean r2 = 0.95) and close agreement (> 90% of readings were within 2 SDs in the Bland Altman plot). Waveforms displayed by the two systems were qualitatively very similar. Pulse rates measured by the two systems were identical.

Conclusions

The Vasotrac system displayed an arterial waveform which was similar to that obtained directly and measured BP and pulse rate accurately. It should be a convenient device to measure BP continually in a non-invasive fashion.

Keywords

Radial Artery Vasoactive Drug Blood Pressure Reading Arterial Waveform Ulnar Neuropathy 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Résumé

Objectif

Évaluer l’exactitude d’une nouvelle méthode non effractive de mesure (Vasotrac™) de la tension artérielle (TA), avec les graphiques qui l’accompagnent montrant les ondes artérielles et les fréquences de pouls, en la comparant avec une méthode effractive et ses graphiques.

Méthode

Des volontaires en santé (n = 53) ont participé à l’étude. Les tensions artérielles et les courbes artérielles obtenues au moyen d’un cathéter de l’artère radiale (TAIA) ont été comparées aux mesures non effractives obtenues à tous les 12–15 battements de l’artère radiale opposée avec le nouveau système (TA Vasotrac). Chez des volontaires (n = 11) d’un sous-groupe, on a provoqué une hausse et une baisse soudaines de la TA avec de l’isoprotérénol, de la phényléphrine et du nitroprussiate de sodium. Les données ont été analysées en déterminant la corrélation et la concordance entre les deux systèmes de mesure. On a examiné les caractéristiques des graphiques obtenus des deux systèmes.

Résultats

Les mesures non effractives de TA faites tous les 12–15 battements avec le Vasotrac sont en corrélation avec celles du système de TAIA(r2 systolique = 0,89; r2 diastolique = 0,88; moyenne de r2 = 0,94). Les tracés, d’après Bland Altman, des valeurs provenant des deux systèmes concordaient étroitement, indiquant > 90% des mesures qui se situent à l’intérieurs de 2 écarts-types. Il y a eu la même corrélation pendant la perfusion de médicament vasoactif. Pendant cette période dynamique, la TA Vasotrac a suivi avec précision les changements de la TAIA avec des mesures correspondantes (r2 systolique = 0,82; r2 diastolique = 0,89; moyenne de r2 = 0,95) et d’étroites concordances (> 90% à l’intérieur de 2 écarts-types). Les graphiques produits par les deux systèmes étaient qualitativement très similaires. Les fréquences de pouls étaient identiques.

Conclusion

Le système Vasotrac a permis de visualiser des ondes artérielles similaires à celles qui ont été obtenues directement, et a mesuré la TA et la fréquence de pouls avec précision. C’est un appareil qui peut être pratique pour mesurer continûment la TA d’une manière non effractive.

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Copyright information

© Canadian Anesthesiologists 1999

Authors and Affiliations

  • Kumar G. Belani
    • 1
  • Joseph J. Buckley
    • 1
  • Marius O. Poliac
    • 2
  1. 1.Department of AnesthesiologyUniversity of Minnesota Medical SchoolMinneapolis
  2. 2.Medwave Inc.Arden HillsUSA

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