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KMID : 0364019960290050510
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Korean Journal of Thoracic and Cardiovascular Surgery
1996 Volume.29 No. 5 p.510 ~ p.516
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Clinical Application of M-number for Aortic Cannulas During Cardiopulmonary By pass
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Abstract
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Cardiopulmonary bypass cannulas are usually characterized by the French number. However this description provides only the external diameter of the cannula, which gives no information about the pressure-flow characteristics of the cannula itself.
A
standardized system to describe the pressure-flow characteristics of a given cannula has recently been proposed and has been termed the M-number. It is reported that the pressure-flow characteristics of a particular cannula can be determined from
a
nomogram or chart, if the experimentally derived M-number of the cannula is known.
In this regard, we conducted an investigation to analyze correlation between experimentally and clinically derived M-numbers using three different sizes of pediatric aortic cannulas in fifty cardiac patients on cardiopulmonary bypass. The
clinical
and
experimental M-numbers showed a strong correlation. The clinical M-numbers were typically 0.35 to 0.55 greater than the experimental M-numbers. The clinical M-numbers also showed an inverse relationship to the temperature change of the patient,
most
probably due to an increase in blood viscosity from hypothermia. This inverse clinical M-numbers/temperature relationship was more marked in higher M-number cannulas. The clinical data obtained in this study suggest that the experimentally
derived
M-numbers correlated strongly with the clinical performance of the cannula with the significant influence of the temperature.
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KEYWORD
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