Comparing Central Aortic Pressures Obtained Using a SphygmoCor Device to Pressures Obtained Using a Pressure Catheter

Area of Science:

• Cardiovascular Physiology
• Medical Device Technology
• Diagnostic Accuracy

Background:

• Noninvasive estimation of central aortic pressure is crucial for cardiovascular assessment.
• The SphygmoCor XCEL Pulse Wave Analysis (PWA) device provides noninvasive pressure estimations.
• Validation against invasive catheterization is necessary to establish clinical utility.

Purpose of the Study:

• To compare noninvasive aortic pressures estimated by the SphygmoCor XCEL device with invasive measurements.
• To evaluate the impact of a linear-fit function on improving the accuracy of these estimations.
• To determine if SphygmoCor estimations can be made comparable to gold-standard catheter measurements.

Main Methods:

• 136 patients undergoing cardiac catheterization were enrolled.
• Aortic pressures were measured invasively via catheter and noninvasively using SphygmoCor.
• Bland-Altman analysis and a novel linear-fit function were applied to assess and correct errors.

Main Results:

• Initial errors between measured and estimated aortic pressures were substantial (mean errors >6.4 mm Hg).
• Application of the linear-fit function significantly reduced these errors to less than 1 mm Hg.
• Bootstrap analysis confirmed the generalizability of the linear-fit function.

Conclusions:

• The SphygmoCor XCEL device can provide accurate aortic pressure estimations when combined with the derived linear-fit function.
• This method enhances the comparability of noninvasive estimations to invasive pressure catheter measurements.
• The findings support the clinical use of SphygmoCor data with the linear-fit adjustment for improved diagnostic accuracy.