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A method for off-line nasal nitric oxide measurement.
1Department of Pediatric Otolaryngology, Children's Hospital of Pittsburgh, 3705 Fifth Ave., Pittsburgh, PA 15213-2583, USA. anil.gungor@chp.edu
Ear, Nose, & Throat Journal
|August 2, 2002
Summary
Off-line nasal nitric oxide (NO) measurements accurately reflect on-line values, even hours later. This validated technique offers a flexible alternative for clinical research and practice.
Area of Science:
- Respiratory Medicine
- Biomedical Engineering
- Analytical Chemistry
Background:
- Nasal nitric oxide (NO) is a crucial biomarker in respiratory health.
- Accurate measurement of nasal NO is vital for diagnosis and monitoring.
- On-line NO measurement requires immediate analysis, limiting its practical application.
Purpose of the Study:
- To evaluate the accuracy of off-line nasal NO measurement techniques.
- To compare immediate and delayed off-line NO measurements with on-line methods.
- To determine the reliability of off-line NO measurements for clinical and research use.
Main Methods:
- Nasal NO samples were collected in syringes from a single volunteer over 2 months (30 sessions).
- Off-line measurements were performed immediately, and 1, 2, and 4 hours post-collection.
- Bland-Altman analysis was used to compare off-line results with simultaneous on-line measurements.
Main Results:
- High correlation (95-98%) was observed between on-line and immediate/delayed off-line NO measurements.
- Off-line techniques demonstrated excellent agreement with the gold standard on-line method.
- Accuracy was maintained even with a 4-hour delay in sample analysis.
Conclusions:
- Off-line nasal NO measurement is a reliable and accurate method.
- This technique eliminates the need for immediate proximity to the NO analyzer.
- Off-line nasal NO measurements can serve as a practical substitute for on-line methods when necessary.