Laryngeal adductory pressure as a measure of post-reinnervation synkinesis

Randal C. Paniello, Steven E. West

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


Laryngeal adductory pressure (LAP) is the pressure induced as the vocal folds squeeze on a balloon while the recurrent laryngeal nerve (RLN) is stimulated. The LAP has been shown to vary with the frequency of stimulation, with a characteristic slope. The RLN was divided and reanastomosed 4 different ways in 12 canine hemilaryngeal preparations; the 4 subgroups represented a range of expected post-reinnervation synkinesis recovery patterns. The LAP frequency-response curve was measured before surgery and at monthly intervals for 6 months after surgery. In the 'best-case' group (RLN adductor and abductor trunks each divided and reanastomosed), the slope was found to return to normal. The 2 whole RLN division-reanastomosis groups (precise realignment or 180°rotation) both gave results similar to those of the 'worst-case' group (RLN adductor and abductor trunks divided and transposed); these 3 subgroups were all significantly different from baseline. The slope of the LAP frequency-response curve may be a useful means of indirectly quantifying laryngeal synkinesis.

Original languageEnglish
Pages (from-to)447-451
Number of pages5
JournalAnnals of Otology, Rhinology and Laryngology
Issue number5 I
StatePublished - 2000


  • Dog
  • Laryngeal synkinesis
  • Recurrent laryngeal nerve


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