The presence of radial arterial lines may diminish distal digital perfusion. Using a pair of pulse oximeters on the index fingers of cannulated and noncannulated arms the saturation and oximeter pulse strength were assessed. Three hundred paired measurements in fifty consecutive Intensive Care patients were undertaken more than two hours after cannula insertion. The pulse strength was 19.7 (SD 6.1) and 19.7 (SD 5.7) on the cannulated and noncannulated sides while the saturation was 97.3 (SD 2.3) and 97.1 (SD 2.4) respectively. These differences are not clinically important and the study demonstrates that reliable pulse oximetry measurements may be made distal to a radial artery cannula. It is recommended that in each individual the placement of the sensor be such as to ensure the best signal and the most stable saturation readings.
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