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Ann Thorac Surg 1992;53:278-281
© 1992 The Society of Thoracic Surgeons

Articles

New method for describing the performance of cardiac surgery cannulas

Ralph E. Delius, MD, J.Patrick Montoya, PhD, Scott I. Merz, MD, Jana McKenzie, BS, Sandy Snedecor, MLS, Edward L. Bove, MD, Robert H. Bartlett, MD*

Section of Thoracic Surgery, Department of Surgery, University of Michigan Medical Center, Ann Arbor, Michigan, USA

Accepted for publication August 12, 1991.

* Address reprint requests to Dr Bartlett, University of Michigan Medical Center, 2920 Taubman Center, Box 0331, 1500 E Medical Center Dr, Ann Arbor, MI 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 arterial 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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