Why the study?
Intraoperative electroencephalography monitoring can be affected by noise and interference, leading to abnormally high Patient State Index values.
Does epicardial pacing affect Patient State Index (PSI) monitoring during open heart surgery?
Does epicardial pacing affect Patient State Index (PSI) monitoring during open heart surgery?
Epicardial pacing during cardiac surgery can cause pacemaker spikes on EEG, leading to falsely elevated Patient State Index values on brain function monitors.
Answers are grounded in this paper and cite their sources.
Anesthesiologists should suspect pacing artifact with unexpectedly high PSI; case report leaves open frequency and generalizability.
BACKGROUND: Anesthesiologists monitor electroencephalography (EEG) intraoperatively to maintain adequate depth of anesthesia. However, the EEG signal is affected by noise and interference. The SedLine® is a brain function monitor with which the Patient State Index (PSI) is calculated. In this study, we report abnormally high PSI values associated with epicardial pacing during open heart surgery. CASE PRESENTATION: A 50-year-old man was scheduled for total arch replacement. Atrial demand pacing was started before weaning from cardiopulmonary bypass. The PSI increased from 30 to 80 soon after the start of pacing, and the EEG waveform showed spikes synchronized with the pacing. As the pacing output was lowered, the spikes on the EEG attenuated and disappeared, and the PSI decreased to < 40. When the pacing output was increased again, the spikes recurred, and the PSI increased again. CONCLUSIONS: Pacemaker spikes may cause contamination of the EEG, resulting in abnormally high PSI values.
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Yonezawa et al. (2022) studied this question.
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