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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