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The standard measurement of flow during cardiopulmonary bypass (CPB) using a roller pump is based on the number of revolutions multiplied by the mls.per revolution.This measurement is dependant on numerous factors.As reduced flow can be detrimental to the patient we used an calibrated transit time ultrasonic flow probe to access if displayed pump flow readings during simulated CPB was affected by varying viscosity,length of pump run time,occlusiveness of the roller pump,use of silicone or PVC in the roller race,different tubing diameters,temperature of the priming solution and outlet pressure.