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- J M Sinard, S I Merz, M D Hatcher, J P Montoya, and R H Bartlett.
- University of Michigan Medical Center, Ann Arbor 48109.
- ASAIO Trans. 1991 Apr 1; 37 (2): 60-4.
AbstractCannulas used for extracorporeal circulating devices are made in many shapes and sizes. Side hole placement, length, and wall thickness can make the pressure-flow characteristics of catheters with similar French sizes quite different in their actual performance. A single value, the M-number, has been developed that describes the pressure-flow characteristics of an individual cannula. This number can be used to compare catheters and assess their potential utility for given bypass requirements. The M-numbers for commonly used catheters that are placed by extrathoracic dissections are determined. Clinical situations are presented that demonstrate applications of the M-number.
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