Neostigmine/glycopyrrolate administered after recovery from neuromuscular block increases upper airway collapsibility by decreasing genioglossus muscle activity in response to negative pharyngeal pressure

Frank Herbstreit, Daniela Zigrahn, Christof Ochterbeck, Jürgen Peters, Matthias Eikermann

Research output: Contribution to journalArticlepeer-review

82 Scopus citations

Abstract

Background: Reversal of residual neuromuscular blockade by acetylcholinesterase inhibitors (e.g., neostigmine) improves respiratory function. However, neostigmine may also impair muscle strength. We hypothesized that neostigmine administered after recovery of the train-of-four (TOF) ratio impairs upper airway integrity and genioglossus muscle function. Methods: We measured, in 10 healthy male volunteers, epiglottic and nasal mask pressures, genioglossus electromyogram, air flow, respiratory timing, and changes in lung volume before, during (TOF ratio: 0.5), and after recovery of the TOF ratio to unity, and after administration of neostigmine 0.03 mg/kg IV (with glycopyrrolate 0.0075 mg/kg). Upper airway critical closing pressure (Pcrit) was calculated from flow-limited breaths during random pharyngeal negative pressure challenges. Results: Pcrit increased significantly after administration of neostigmine/glycopyrrolate compared with both TOF recovery (mean ± SD, by 27 ± 21%; P = 0.02) and baseline (by 38 ± 17%; P = 0.002). In parallel, phasic genioglossus activity evoked by negative pharyngeal pressure decreased (by 37 ± 29%, P = 0.005) compared with recovery, almost to a level observed at a TOF ratio of 0.5. Lung volume, respiratory timing, tidal volume, and minute ventilation remained unchanged after neostigmine/ glycopyrrolate injection. Conclusion: Neostigmine/glycopyrrolate, when administered after recovery from neuromuscular block, increases upper airway collapsibility and impairs genioglossus muscle activation in response to negative pharyngeal pressure. Reversal with acetylcholinesterase inhibitors may be undesirable in the absence of neuromuscular blockade.

Original languageEnglish (US)
Pages (from-to)1280-1288
Number of pages9
JournalAnesthesiology
Volume113
Issue number6
DOIs
StatePublished - Dec 2010
Externally publishedYes

ASJC Scopus subject areas

  • Anesthesiology and Pain Medicine

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