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Standardized Measurement of Nasal Membrane Transepithelial Potential Difference NPD
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A multiple reader scoring system for Nasal Potential Difference parameters.

George M Solomon1, Bo Liu1, Isabelle Sermet-Gaudelus2

  • 1Department of Medicine, The Gregory Fleming James Cystic Fibrosis Research Center, University of Alabama at Birmingham, Birmingham, AL, USA.

Journal of Cystic Fibrosis : Official Journal of the European Cystic Fibrosis Society
|May 4, 2017
PubMed
Summary
This summary is machine-generated.

Agreement on nasal potential difference (NPD) interpretation varies. A standardized scoring algorithm showed excellent reader agreement for cystic fibrosis (CF) tracings but less for others, highlighting the need for multi-reader review in CFTR function assessment.

Keywords:
CFTRClinical trial outcomesNasal Potential Difference

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Area of Science:

  • Pulmonary Medicine
  • Biomarker Research
  • Clinical Diagnostics

Background:

  • Nasal Potential Difference (NPD) measures Cystic Fibrosis Transmembrane Conductance Regulator (CFTR) activity.
  • NPD is crucial for diagnosing Cystic Fibrosis (CF) and monitoring therapeutic interventions.
  • Limited data exists on inter-reader agreement for NPD interpretation using scoring algorithms.

Purpose of the Study:

  • To develop and validate a standardized scoring algorithm for NPD interpretation.
  • To assess the agreement level of NPD parameters among trained readers.
  • To evaluate reader confidence and interpretability in NPD measurements.

Main Methods:

  • A standardized scoring algorithm was created for potential difference (PD) interpretability and confidence.
  • Trained readers interpreted NPD measurements using the developed algorithm.
  • Inter-reader agreement was statistically analyzed for various NPD parameters.

Main Results:

  • Excellent interpretability agreement was found for CF tracings, fair for normal, and slight for indeterminate tracings.
  • High correlation was observed for Ringer's Baseline PD, Δamiloride, and ΔCl-free+Isoproterenol among interpretable tracings.
  • Slight agreement on confidence led to divergence in PD values between high and low confidence CF tracings.

Conclusions:

  • A multi-reader approach with adjudication is essential for accurate NPD scoring.
  • Standardized algorithms improve NPD interpretation reliability for CF diagnosis.
  • Consistent NPD assessment is vital for effective monitoring in CF clinical trials.