• Regional anesthesia · Mar 1993

    Pulse oximeter waveforms from the finger and toe during lumbar epidural anesthesia.

    • R Mineo and N E Sharrock.
    • Department of Anesthesiology, Hospital For Special Surgery, Cornell University Medical College, New York, New York 10021.
    • Reg Anesth. 1993 Mar 1; 18 (2): 106-9.

    Background And ObjectivesTo determine whether lumbar epidural anesthesia affects pulse oximeter signals in the upper or lower extremity, 13 ASA I patients were studied.MethodsTemperature and pulse oximeter probes were placed on the finger and the toe.ResultsAfter epidural injection, the amplitude of the pulse oximeter waveform on the toe increased eight-fold but declined by 50% in the finger. The increase in amplitude of the pulse oximeter waveform in the foot preceded the temperature rise.ConclusionsMore reliable pulse oximeter signals may be obtained from the toe than the finger during lumbar epidural anesthesia. Furthermore, the increase in the pulse amplitude from the toe may aid in the early detection of successful epidural block.

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