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The Annals of Thoracic Surgery, Vol 53, 278-281, Copyright © 1992 by The Society of Thoracic Surgeons

ARTICLES

New method for describing the performance of cardiac surgery cannulas

RE Delius, JP Montoya, SI Merz, J McKenzie, S Snedecor, EL Bove and RH Bartlett
Department of Surgery, University of Michigan Medical Center, Ann Arbor 49109-0331.

Cardiac surgery cannulas are characterized by external diameter only, which provides little information about the pressure-flow characteristics of a cannula. A system has been developed to describe pressure-flow characteristics with a single, unitless number, M, which is patterned after a Reynolds friction factor correlation. A cannula with a lower M number has a more favorable pressure-flow relationship. The M number was determined for 16 arterials cannulas ranging in size from 10F to 26F and 27 venous cannulas sized 12F to 36F. Pressure-flow characteristics vary considerably among cannulas from different manufacturers despite having similar French sizes. Clinical decisions regarding choice of cannula can be simplified by using the M number, which gives a more accurate description of the performance characteristics of a cannula than the French size designation.

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