A magnetic resonance perspective of the pulse wave transit time by the Arteriograph device and potential for improving aortic length estimation for central pulse wave velocity

作者：Rezai Mohammad Reza; Cowan Brett R; Sherratt Neal; Finn Joseph D; Wu Frederick C W; Cruickshank J Kennedy^*

来源：Blood Pressure Monitoring, 2013, 18(2): 111-118.

DOI：10.1097/MBP.0b013e32835d3663

• aortic pulse wave velocity
• Arteriograph
• magnetic resonance imaging

Background Simple reproducible methods of measuring arterial stiffness, a powerful index of prognosis, are becoming available. %26lt;br%26gt;Aim To compare the pulse wave transit time (TT) and pulse wave velocity (PWV) between MRI and an arm cuff-based oscillometric method, the Arteriograph. %26lt;br%26gt;Materials and methods MRI phase-contrast data were acquired at the aortic arch and just above the aortic bifurcation in 49 men (age 53 +/- 6 years). Supine left-arm Arteriograph measurements were made after MRI using the surface sternal notch to symphysis pubis pathway length. %26lt;br%26gt;Results MRI TT and PWV covered 86% of aortic root-bifurcation length omitting a mean 4.7 cm of proximal ascending aorta. Arteriograph TT (71 +/- 9 ms) was 6.6ms [95% confidence interval (CI) 3.9-9.4] or 10% higher than MRI (64 +/- 10 ms). Arteriograph PWV (7.9 +/- 1.3m/s) was 1.33m/s (95% CI 0.95-1.70) higher than MRI (6.6 +/- 1.2m/s), primarily because the surface aortic length was 70 mm (95% CI 59-81) longer than MRI. Arteriograph-MRI PWV difference decreased to 0.31 m/s (95% CI 0.01-0.61) when Arteriograph PWV was calculated using the MRI aortic path length and to 0.25 m/s (95% CI - 0.05 to 0.55) after correcting for the aortic segments omitted in the MRI method. After similar TT corrections for MRI, the Arteriograph-MRI difference in TT reduced to 3.2 ms (95% CI 0.2-6). %26lt;br%26gt;Conclusion TT estimations by Arteriograph and MRI are close. More accurate length estimation from MRI-derived models improves Arteriograph PWV measurement.

• 出版日期2013-4