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Flow characteristics of the Hemopump: an experimental in vitro study.
Linköping University, Department of Medicine and Care, Clinical Physiology. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Heart and Medicine Center, Department of Clinical Physiology in Linköping.
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1997 (English)In: Annals of Thoracic Surgery, ISSN 0003-4975, Vol. 63, no 1, 162-166 p.Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: The Hemopump (DLP/Medtronic) has been in clinical use for about 7 years. There is still no adequate way of determining actual output from the three available pump systems in the clinical situation. If the pump is completely stopped during weaning from the device, there is a possibility of back-leakage through the pump, endangering the patient from regurgitation into the left ventricle. It can also make it more difficult to judge the recovery of heart function because of a volume load of the left ventricle. The aim of this study was to evaluate in a standardized, experimental in vitro model the output from three different-sized Hemopump catheters at various pressure levels and to quantify the back-flow through the pumps.

METHODS: The Hemopump models were tested in an in vitro study regarding total outflow at various speeds at three pressure levels. The back-flow through the pumps was also measured with the pumps at a complete stop.

RESULTS: The outflow from the Hemopumps ranged from 0.4 to 4.5 L/min, depending on which pump and speed were used. Variations in total output, depending on speed and various pressure settings, could be up to 0.4 L/min. Back-flow through the pump into the left ventricle may be as great as 1.6 L/min.

CONCLUSIONS: The flow outputs from the different Hemopump models were reproducible over time and were closely related to the resistance of the model. The Hemopump, if not running, can induce substantial regurgitation through the pump into the left ventricle.

Place, publisher, year, edition, pages
1997. Vol. 63, no 1, 162-166 p.
National Category
Biomedical Laboratory Science/Technology
URN: urn:nbn:se:liu:diva-116986DOI: 10.1016/S0003-4975(96)00746-1PubMedID: 8993259OAI: diva2:801875
Available from: 2015-04-10 Created: 2015-04-10 Last updated: 2015-04-21

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Wranne, BengtAsk, Per
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Clinical PhysiologyFaculty of Health SciencesDepartment of Clinical Physiology in LinköpingPhysiological MeasurementsThe Institute of Technology
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