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Abnormal breathing patterns are common in chronic refractory cough (CRC) and inducible laryngeal obstruction (ILO), impacting laryngeal motor function but not hypersensitivity. These findings inform speech pathology interventions for CRC.

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Area of Science:

  • Respirology
  • Speech-Language Pathology
  • Laryngology

Background:

  • Chronic refractory cough (CRC) is a complex condition where abnormal breathing patterns are suspected but poorly understood.
  • Speech pathology is an effective intervention for CRC, potentially addressing breathing patterns indirectly.
  • Understanding breathing pattern changes is crucial for optimizing behavioral treatment in CRC.

Purpose of the Study:

  • To characterize breathing patterns in CRC patients.
  • To compare breathing patterns in CRC patients with those in inducible laryngeal obstruction (ILO).
  • To assess the relationship between breathing patterns and laryngeal sensory/motor dysfunction.

Main Methods:

  • A retrospective, cross-sectional observational study of 634 patients with CRC or ILO.
  • Analysis of speech pathology assessment data, including questionnaires and clinical voice/breathing assessments.
  • Audit of self-reported laryngeal symptoms and clinical laryngeal function.

Main Results:

  • 73% of CRC patients exhibited abnormal breathing patterns, primarily thoracic (69%) and oral (33%) breathing.
  • Breathing pattern abnormalities were similar in prevalence and type between CRC and ILO groups.
  • Abnormal breathing patterns correlated with reduced maximum phonation time (MPT) but not with laryngeal hypersensitivity scores.

Conclusions:

  • Abnormal breathing features are prevalent in CRC and comparable to ILO.
  • A link exists between abnormal breathing patterns and impaired laryngeal motor function (reduced MPT).
  • No association was found between abnormal breathing patterns and laryngeal hypersensitivity in CRC patients.