What question did this study set out to answer?

To validate Doppler measurements of ascending aortic blood velocity and acceleration against an electromagnetic catheter-tip system.

Validation of Doppler Measured Ascending Aortic Blood Velocity & Acceleration in Humans against an Electromagnetic Catheter-Tip System

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Supports Doppler reliability for aortic velocity; leaves open larger outcome trials before clinical adoption.

To validate Doppler measurements of ascending aortic blood velocity and acceleration against an electromagnetic catheter-tip system.
Utilized Doppler techniques to measure blood velocity and acceleration.
Compared results with readings from an electromagnetic catheter-tip system.
Conducted the study in a hospital setting with human subjects.
Doppler measurements correlated strongly with catheter-tip measurements, indicating high reliability.
Specific metrics for velocity and acceleration were not provided in the abstract.

Mehta et al. (1986) studied this question.

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