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P2.14 Influence of Calibration of Peripheral Pressure on the Estimation of Central Systolic Blood Pressure
Artery Research volume 2, pages 109–110 (2008)
Abstract
Objective
We compared the accuracy with which central systolic aortic pressure (cSBP) can be estimated from the late systolic shoulder of the digital artery pressure waveform (SBP2) when the digital waveform is calibrated using a validated non-invasive oscillometric device and when it is calibrated using mean (MAP) and diastolic (DBP) central blood pressure measurement.
Design
Subjects (n=25) were studied at the time of cardiac catheterisation for diagnostic angiography and/or angioplasty. The study was approved by the local research ethics committee and all subjects gave written informed consent.
Methods
cSBP was measured with a Millar SPC-454D (Millar instruments Houston, Texas) catheter with the tip of the catheter in the proximal aortic root. Peripheral pressure waveforms were acquired from the digital artery using a Finometer (Finapres medical systems, Netherlands) and were calibrated from aortic mean and diastolic pressures and from systolic and diastolic pressures measured using an Omron 750IT (Omron Healthcare). Measurements of digital artery and aortic pressures were obtained at baseline and after nitroglycerin (NTG, sublingual spray 500 µg).
Results
The overall mean (±SD) difference between cSBP and SBP2 calibrated using the Omron 750ITwas 1.4±11.8 mmHg. When SBP2 was calibrated from aortic MAP and DBP the difference between cSBP and SBP2 was −1.1 ±5.6 mmHg.
Conclusion
These results suggest non-invasive calibration does not produce a major systematic error in estimation of cSBP from SBP2 but does introduce greater variability when compared to invasive calibration.
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This is an open access article distributed under the CC BY-NC license https://doi.org/creativecommons.org/licenses/by/4.0/.
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Guilcher, A., Clapp, B., Brett, S. et al. P2.14 Influence of Calibration of Peripheral Pressure on the Estimation of Central Systolic Blood Pressure. Artery Res 2, 109–110 (2008). https://doi.org/10.1016/j.artres.2008.08.380
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DOI: https://doi.org/10.1016/j.artres.2008.08.380