Open AccessA Catheter Tip Method for Measurement of the Instantaneous Aortic Blood Velocity
Author(s) -
Donald L. Fry,
Alexander J. Mallos,
Alfred G. T. Casper
Publication year - 1956
Publication title -
circulation research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.899
H-Index - 336
eISSN - 1524-4571
pISSN - 0009-7330
DOI - 10.1161/01.res.4.5.627
Subject(s) - pulsatile flow , aorta , aortic pressure , blood flow , piston (optics) , flow velocity , mechanics , piston pump , lumen (anatomy) , mathematics , catheter , flow (mathematics) , blood pressure , biomedical engineering , materials science , mathematical analysis , physics , cardiology , medicine , surgery , geometry , wavefront , optics , cylinder
A method of determining the instantaneous aortic blood velocity from the pressure difference between two points along the axis of the aorta was derived from the Navier-Stokes equation. Experimental support for the derived formula was obtained in a flow model and in a living animal aorta. The flow model was a small piston pump which produced a known sinusoidal fluid velocity. The velocity computed from the formula compared well with the known values. In the living animal the formula yielded a velocity curve which compared favorably with those in the literature. The pressure difference from which the velocity was computed was obtained through a specially designed double lumen catheter attached to a differential pressure transducer. The method is applicable only to pulsatile flow.
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