Non-occlusive condition with the Better-Header roller pump: impacts of flow dynamics and hemolysis.
OBJECTIVE
Impacts on hemolysis and backflow using a non-occlusive setting with the Better-Header (BH) roller pump were investigated.


RESULTS
Pump flow of a non-occlusion setting was measured with a pump speed of 3 L/min and 5 L/min against various after-loads. With the non-occlusive setting (BH-NO350), backflow was less than 10% if the pump pressure head was <300 mmHg. When the outlet line is occluded, 80% of the set flow was shunted through the pressure relief valve and outlet pressure did not develop hazardous overpressure. During surgery with the BH-NO350, flow loss was <5% while the pump pressure was maintained at approximately 200 mmHg. An in vitro hemolysis test was conducted at 5 L/min against 350 mmHg, using the standard occlusion (BH-SO), the non-occlusion (BH-NO350), and the centrifugal pump (CP). The CP demonstrated less hemolysis than the other two groups; the BH-SO and the BH-NO350 had similar hemolytic characteristics. During cardiopulmonary bypass, no significant differences in hemolysis were seen among the BH-SO, the BH-NO350, and the CP.


CONCLUSIONS
Possible flow loss of the non-occlusion setting with the BH should be almost negligible in most clinical situations. The BH-NO350 demonstrated hemolytic characteristics similar to those of the BH-SO, but not as good as those of the CP.
Tayama
Eiki
E
Department of Surgery, Kurume University School of Medicine, Fukuoka, Japan.
Teshima
Hideki
H
Takaseya
Tohru
T
Fukunaga
Shuji
S
Tayama
Kei-ichiro
K
Hayashida
Nobuhiko
N
Akashi
Hidetoshi
H
Kawara
Takemi
T
Aoyagi
Shigeaki
S
D001794:Blood Pressure; D002315:Cardiopulmonary Bypass / Q000295:instrumentation*; D001026:Coronary Artery Bypass / Q000295:instrumentation; D003326:Coronary Circulation; D003327:Coronary Disease / Q000503:physiopathology / Q000601:surgery*; D005112:Extracorporeal Circulation / Q000295:instrumentation; D006461:Hemolysis; D006801:Humans