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CARDIOVASCULAR
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Volume 4, 1999, No 1 |
Clinical Comparison of Efficiency of Two Heat
Exchangers for Blood Cardioplegia (BARD and MACCHI)
V. Lonský, J. Mand’ák, J. Dominik, J. Kubicek, J.
Bímová, D. Marková, P. Matoulková, M. Volt
Background: Blood cardioplegia (BCP) is routinely used for myocardial protection by a great number of cardiac surgeons. As a result of increasingly widespread use of it, a variety of cardioplegic delivery systems have been developed and marketed. The aim of our study was to compare, under normal clinical conditions, two heat exchangers for blood cardioplegia delivery which we use in our practice. Bard CDS41 and Macchi SCS.
Methods: Twenty of each units were tested during routine coronary surgery with moderate hypothermic CPB, intermittend cold antegrade 4:1 BCP myocardial protection with warm BCP reperfusion. The performance of each device was tested by determination of actual cardioplegia delivery temperature and by calculation of efficiency (E) of the heat exchanger. The study was based on the work of Harrison and Munsch in which four other blood cardioplegia systems were evaluated (Shiley, Gish, Sarns, Dideco). Our results were also compared to theirs.
Results: Both our tested devices were able to cool BCP well below 10° C satisfactorily but the Macchi was significantly better. During cooling E was for Macchi 0,90 ± 0,02 and for Bard 0,81 ± 0,01. The Bard was significantly less efficient than Macchi. But both of our tested systems were more efficient for cooling than the others tested by Harrison and Munsch.
Conclusion: On the basis of our results and our experience we can recommend both of our tested devices for clinical use.
Key words: myocardial protection, blood cardioplegia, blood cardioplegia delivery systems, efficiency of blood cardioplegia delivery systems
Address for Correspondence:
Vladimír Lonský, M.D.
University Department of Cardiac Surgery
University Hospital
CZ-50005 Hradec Králové
Czech Republic
E-mail: vlonsky@usa.net
Reference:
(CVE. 1999; 4 (1): 15-17)
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