• A&A practice · Aug 2021

    Pulse Oximetry Waveform Represents an Earlier Ventricular Contraction in Relation to the Intraarterial Blood Pressure Tracing and Electrocardiogram on Multichannel Monitors: A Case Series.

    • Nilay Tripathi, Mukesh Tripathi, and Mamta Pandey.
    • From the Department of Pulmonary Medicine, King George's Medical University, Lucknow, India.
    • A A Pract. 2021 Aug 2; 15 (8): e01505e01505.

    AbstractMultichannel patient monitors apparently display the electrocardiogram, intra-arterial blood pressure, and pulse oximetry waveforms in synchrony during sinus cardiac rhythm. We recorded 20 events of a premature cardiac contraction on multichannel monitors from 10 patients. Interestingly, during premature cardiac contraction, the low-amplitude arterial trace was aligned with the premature electrocardiogram, but the low-amplitude pulse oximetry plethysmograph was aligned with the next normal electrocardiogram and arterial tracing. In conclusion, the pulse oximetry plethysmograph tracing is offset by 1 ventricular depolarization on the electrocardiogram (QRS) and the arterial tracing on multichannel monitors.Copyright © 2021 International Anesthesia Research Society.

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