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Perfusion
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research-article

Differences in displayed pump flow compared to measured flow under varying conditions during simulated cardiopulmonary bypass

M Hargrove

Cardiothoracic Surgery Unit, Cork University Hospital, Wilton, Cork, Ireland Martin.Hargrove{at}mailp.hse.ie

A O’Donnell

Cardiothoracic Surgery Unit, Cork University Hospital, Wilton, Cork, Ireland

T Aherne

Cardiothoracic Surgery Unit, Cork University Hospital, Wilton, Cork, Ireland

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.

Key Words: cardiopulmonary bypass • displayed flow • flow probe • measured flow

Perfusion, Vol. 23, No. 4, 227-230 (2008)
DOI: 10.1177/0267659108100458
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