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Standardized Measurement of Nasal Membrane Transepithelial Potential Difference (NPD)
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Minimal clinically important differences in nasal peak inspiratory flow.

Daniel Timperley1, Aviva Srubisky, Nicholas Stow

  • 1Department of Otolaryngology / Skull Base Surgery, St. Vincent`s Hospital, Victoria St, Darlinghurst, Sydney NSW 2010, Australia. daniel.timperley@gmail.com

Rhinology
|April 7, 2011
PubMed
Summary

Nasal Peak Inspiratory Flow (NPIF) is a quick measure of nasal function. A minimum clinically important difference (MCID) of 20 L/min is recommended for NPIF to assess nasal surgery outcomes.

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Area of Science:

  • Otolaryngology
  • Rhinology
  • Surgical Outcomes Measurement

Background:

  • Nasal function assessment involves various methods like Acoustic Rhinometry, Rhinomanometry, Nasal Spirometry, and Nasal Peak Inspiratory Flow (NPIF).
  • NPIF offers a simple and rapid clinical integration, despite potential limitations in test-retest reliability due to effort dependency.
  • Defining the Minimum Clinically Important Difference (MCID) is crucial for evaluating the true clinical impact of interventions, distinguishing statistical significance from clinical relevance.

Purpose of the Study:

  • To define the Minimum Clinically Important Difference (MCID) for Nasal Peak Inspiratory Flow (NPIF).
  • To establish a clinically relevant threshold for change in NPIF following nasal surgery.

Main Methods:

  • A prospective study involving 51 patients undergoing open septorhinoplasty at a tertiary clinic.
  • Nasal obstruction scores and NPIF were recorded pre- and post-operatively.
  • Both statistical (half standard deviation) and patient-anchored techniques were employed to determine the MCID for NPIF.

Main Results:

  • The study included 51 patients (75% female, mean age 36 years) who underwent open rhinoplasty with septal reconstruction, spreader grafts, and turbinate reduction.
  • Baseline NPIF averaged 101 ± 35 L/min.
  • The statistically derived MCID was 18 L/min, while patient-anchored methods suggested an MCID of 20 L/min and 20-25 L/min.

Conclusions:

  • An MCID of 20 L/min is recommended for Nasal Peak Inspiratory Flow (NPIF) when used as an outcome measure in nasal surgery.
  • Understanding the MCID for NPIF is critical for accurately assessing the clinical impact of surgical interventions on nasal function.
  • Despite potential effort dependency, NPIF is a simple, quick, and learnable technique for assessing nasal function outcomes.