Objective To compare arterial blood pressure measurementsobtained from the femoral and auriculararteries in anaesthetized pigs.Study design Prospective experimental study.Animals Fifteen female Large White pigs were usedweighing 21.3 ± 2.3 kg.Methods The pigs were anaesthetized with tiletamine/zolazepam and xylazine administered intramuscularly,and anaesthesia maintained withisoflurane delivered in oxygen/nitrogen. Arterialoxygen partial pressures were maintained between11.3 and 13.3 kPa and PaCO2 between 4.6 and6.0 kPa. Monitoring included electrocardiogram,capnography and invasive blood pressure. Theauricular and femoral arteries were catheterizedfor continuous systolic (SAP), diastolic (DAP) andmean arterial pressure (MAP) measurements. Measurementswere recorded every 15 minutes. Statisticalanalysis involved a Bland–Altman plotanalysis.Results The mean difference ± confidence intervalsbetween the femoral and the auricular arterialdiastolic, systolic and mean blood pressure measurementsduring hypotension were 2 ± 7, 2 ± 5 and2 ± 5 mmHg respectively. In conditions of normotensionmean difference ± confidence intervals, offemoral and auricular arterial blood pressure measurementsof diastolic, systolic and mean bloodpressure were 4 ± 5, 3 ± 7 and 4 ± 4 mmHgrespectively. In conditions of increased arterial bloodpressure, mean difference ± confidence intervals,of femoral and auricular arterial blood pressuremeasurements of diastolic, systolic and mean bloodpressure were 4 ± 5, 3 ± 8 and 4 ± 4 mmHgrespectively.Conclusion Auricular artery catheterization is easierand quicker to perform. Pressure measurementsfrom the auricular artery compared well with thefemoral artery.Clinical relevance We found that auricular arterialblood pressures were similar to femoral arterialvalues under the conditions of this experiment. Wedid not test extremes of blood pressure or significantalterations in body temperature.