AI Article Synopsis

  • The study examined the impact of pyridostigmine on anesthesia depth, using spectral entropy as a measurement tool.
  • Fifty-six patients undergoing thyroid or parotid surgery were divided into two groups: one received pyridostigmine with glycopyrrolate, and the other received a saline solution.
  • Results indicated that pyridostigmine significantly increased response entropy values but did not affect state entropy, suggesting the potential of spectral entropy in monitoring anesthesia depth during recovery.

Article Abstract

Background: According to several studies investigating the relationship between muscle activity and electroencephalogram results, reversal of neuromuscular blockade (NMB) may affect depth of anesthesia indices. Therefore, we investigated the effect of pyridostigmine on these indices via spectral entropy.

Methods: Fifty-six patients scheduled for thyroidectomy or parotidectomy were included in this study and randomized into two groups. At the start of skin suturing, the desflurane concentration was adjusted to 4.2 vol% in both groups. Following this, the pyridostigmine group (group P, n = 28) was administered pyridostigmine 0.2 mg/kg mixed with glycopyrrolate 0.04 mg/kg, while the control group (group C, n = 28) received normal saline. Entropy values (response entropy [RE] and state entropy [SE]), train of four (TOF) ratio, and end-tidal desflurane concentration were recorded from point of drug administration to 15 minutes post-drug administration.

Results: Mean RE values at 15 minutes, when the maximum effect of pyridostigmine was anticipated, showed a statistically significant difference between groups (53.8 ± 10.5 in group P and 48.0 ± 8.8 in group C; P = 0.030). However, mean SE at 15 minutes showed no significant difference between the two groups (P = 0.066). At 15 minutes, there were significant differences in the TOF ratio between the two groups (P < 0.001).

Conclusions: NMB reversal by pyridostigmine significantly increased RE values but not SE values. This finding suggests that spectral entropy may be a useful alternative tool for monitoring anesthetic depth during recovery from anesthesia in the presence of electromyogram activity.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4891533PMC
http://dx.doi.org/10.4097/kjae.2016.69.3.227DOI Listing

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