In surgical and critically ill patients, the Vasotrac measured BP, pulse rate, and displayed radial artery waveform, which was similar to direct radial arterial measurements. It should be a suitable device to measure BP frequently in a noninvasive fashion.
Purpose: To evaluate the accuracy of anew non-invasive method (Vasotrac TM) 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= I I), 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 r ~ = 0.89; diastolic r 2 = 0.88; mean r a = 0.94). The actual values obtained by the two methods agreed closely with > 9096 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 r 2= 0.82; diastolic r 2 = 0.89; mean r 2 = 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.Objectif: I~valuer I'exactitude d'une nouvelle m&hode non effractive de mesure (Vasotrac TM) de la tension art&ielle (TA), avec les graphiques qui I'accompagnent montrant les ondes art&ielles et les frEquences de pouls, en la comparant avec une m~thode effractive et ses graphiques. M&hode : Des volontaires en santE (n = 53) ont participE ~ I'&ude. Les tensions art~delles et les courbes art&ielles obtenues au moyen d'un catheter de I'art&e radiale (TAIA) ont EtE compar&s aux mesures non effractives obtenues tousles 12-15 battements de I'art&e radiale oppos& avec le nouveau syst~me (TA Vasotrac). Chez des volontaires (n --I I) d'un sous-groupe, on a provoquE une hausse et une baisse soudaines de la TA avec de I'isoprot&Enol, de la ph~nylEphrine et du nitroprussiate de sodium. Les donnEes ont EtE analysEes en determinant la correlation et la concordance entre les deux systEmes de mesure. On a examin~ les caract&istiques des graphiques obtenus des deux systEmes. REsultats : Les mesures non effractives de TA faites tous les 12-I 5 battements avec le Vasotrac sont en correlation avec celles du syst~me de TAIA (r 2 systolique = 0,89 ; r 2 diastolique = 0,88 ; moyenne de r a = 0,94). Les trac&, d'apr~s Bland Altman, des valeurs provenant des deux syst~mes co...
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