title: Differences in displayed pump flow compared to measured flow under varying conditions during simulated cardiopulmonary bypass.
abstract: Errors in blood flow delivery due to shunting have been reported to reduce flow by, potentially, up to 40-83% during cardiopulmonary bypass. The standard roller-pump measures revolutions per minute and a calibration factor for different tubing sizes calculates and displays flow accordingly. We compared displayed roller-pump flow with ultrasonically measured flow to ascertain if measured flow correlated with the heart-lung pump flow reading. Comparison of flows was measured under varying conditions of pump run duration, temperature, viscosity, varying arterial/venous loops, occlusiveness, outlet pressure, use of silicone or polyvinyl chloride (PVC) in the roller race, different tubing diameters, and use of a venous vacuum-drainage device.
authors.affiliation: Cardiothoracic Surgery Unit, Cork University Hospital, Wilton, Cork, Ireland. Martin.Hargrove@mailp.hse.ie
authors.forename: M
authors.initials: M
authors.lastname: Hargrove
authors.forename: A
authors.initials: A
authors.lastname: O'Donnell
authors.forename: T
authors.initials: T
authors.lastname: Aherne
mesh_terms: D001783:Blood Flow Velocity; D002315:Cardiopulmonary Bypass / Q000295:instrumentation*; D006801:Humans; D008955:Models, Cardiovascular; D016544:Patient Simulation; D011143:Polyvinyl Chloride / Q000737:chemistry; D013696:Temperature; D014783:Viscosity
chemical_list: D011143:Polyvinyl Chloride