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Conducting Respiratory Oscillometry in an Outpatient Setting
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Vocal cord dysfunction as demonstrated by impulse oscillometry.

Hirsh D Komarow1, Michael Young2, Celeste Nelson1

  • 1Laboratory of Allergic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Md.

The Journal of Allergy and Clinical Immunology. in Practice
|February 26, 2014
PubMed
Summary
This summary is machine-generated.

Impulse oscillometry (IOS) shows a distinct pattern in vocal cord dysfunction (VCD) patients, aiding diagnosis. This noninvasive method can be a valuable tool for identifying VCD when symptoms are unclear.

Keywords:
Vocal cord dysfunctionasthmaimpulse oscillometrylaryngoscopyspirometry

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Area of Science:

  • Respiratory Medicine
  • Pulmonology
  • Diagnostic Imaging

Background:

  • Vocal cord dysfunction (VCD) is a challenging respiratory disorder due to inconsistent diagnostic findings.
  • Traditional diagnostic methods like spirometry and laryngoscopy have limitations in capturing VCD during symptomatic episodes.

Purpose of the Study:

  • To investigate the utility of impulse oscillometry (IOS) as a diagnostic tool for vocal cord dysfunction (VCD).

Main Methods:

  • IOS and spirometry were performed on patients with suspected VCD, healthy subjects, and asthma patients.
  • Laryngoscopy was used to confirm VCD diagnosis.
  • Exercise and irritant challenges were employed in select VCD-suspected cases to elicit symptoms and assess pulmonary function.

Main Results:

  • Patients diagnosed with VCD exhibited significantly higher amplitude and variability in IOS impedance during inspiration compared to those without VCD.
  • This characteristic IOS pattern was not observed in healthy individuals or asthma patients, even after challenges.
  • IOS revealed distinct impedance spikes in VCD patients (mean 9.3 cm H2O/L/sec) versus non-VCD groups (mean 2.0 cm H2O/L/sec).

Conclusions:

  • Impulse oscillometry (IOS) demonstrates a unique impedance pattern in patients with vocal cord dysfunction (VCD).
  • IOS may serve as a rapid, noninvasive supplementary diagnostic method for suspected VCD.
  • This technique could improve the assessment and diagnosis of VCD, especially when symptoms are intermittent.