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Variability Between Initial and Subsequent Measurements of Noninvasive Blood Pressure
Poster Title: Variability Between Initial and Subsequent Measurements of Noninvasive Blood Pressure
Submitted on 19 Apr 2018
Author(s): Andrew Griffin, Kyle Brunner
Affiliations: Quinnipiac University
This poster was presented at American Academy of Anesthesiologist Assistant Conference 2018
Poster Views: 451
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Poster Information
Abstract: The use of NIBP monitoring as a basis for intraoperative management relies upon consistent measurements for each individual patient. The purpose of our research was to analyze trends of deviation between initial and subsequent NIBP measurements in order to evaluate the reliability of using the first NIBP measurement as a basis for intraoperative management. Our casual observation was that the first NIBP measurement was always higher than the second reading, thus we undertook a formal preliminary study to determine if this phenomenon is real. For this exploratory project six subjects were chosen from students and instructors without regard to age, illness, medication, or sex. Each subject's blood pressure was measured for six consecutive cycles using three minute intervals between each cycle. Data was collected for each subject using three separate monitors, including the GE Carescape B850, the Philips Intelliview MX800, and Drager’s Infinity M540 monitor. Our findings demonstrated that the initial measurements are significantly elevated from the second measurements on all subjects and all monitors. Patient monitors from different manufacturers were used under the assumption that different manufacturers have different algorithms for computing systolic, diastolic and mean pressures, although they are all based upon oscillometric principles (Longnecker et al). If algorithms are different then the underlying cause may be related to mechanics of vascular physiology. Summary: In this preliminary study, we analyzed trends of deviation between initial and subsequent NIBP (noninvasive blood pressure) measurements. We sought to determine if our casual observation of the first systolic measurement being higher than subsequent measurements was a genuine phenomenon consistent among multiple manufacturers of NIBP modules.References: Pickering TG, Hall JE, Appel LJ, et al. AHA Scientific Statement: Recommendations for blood pressure measurement in humans and experimental animals, part 1: blood pressure measurement in humans.  Hypertension.  2005; 45: 142-161. (Available at:

Longnecker D, Brown D, Newman M, Zapol W. Anesthesiology. 1st ed. China: McGraw Hill; 2008. 519 p.
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