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Abstract #2841

Real-time monitoring of Exercise Stress using Spiral Flow MRI

Rajiv Ramasawmy1, Anthony Z Faranesh1, Jaffar M Khan1, Toby Rogers1, Robert J Lederman1, Michael S Hansen1, and Adrienne E Campbell-Washburn1

1National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD, United States

Interventional cardiovascular MR exams can augment catheter procedures with simultaneous functional measurements. This preliminary work implements an accelerated spiral acquisition to measure real-time, beat-to-beat cardiac output changes during exercise stress induced using a MR-compatible ergometer. At rest, the beat-to-beat variation in cardiac output had a coefficient of variation of 19.1 ± 16.8%. Using this high temporal resolution sequence, a significant increase in cardiac output (5.23 L/min to 8.39 L/min) was measured between rest and exercise sustained at 160-180 W.

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