Logo Medical Science Monitor

Call: +1.631.470.9640
Mon - Fri 10:00 am - 02:00 pm EST

Contact Us

Logo Medical Science Monitor Logo Medical Science Monitor Logo Medical Science Monitor

01 August 2008

Exhaled breath condensate nitrite--methodological problems of sample collection

Ursula RangeC, Volker NeumeisterB

Med Sci Monit 2008; 14(8): CR416-422 :: ID: 865791

Abstract

Background
Exhaled breath condensate (EBC) analysis is a promising new method to monitor airway inflammation, however there are still multiple open methodological questions. The purpose of this study was therefore to investigate methodological influences on nitrite in EBC (surface contamination, flow dependency, storage time and inter- and within day variability).
Material and Method
EBC samples of 10 healthy children, 10 healthy adults and 71 asthmatic children were collected and nitrite was analysed using the Griess reaction. Collector devices where either air-dried after disinfection or stored in distilled water till usage. Repeatability measurements were performed at three different times during one day and on five consecutive days. Flow dependency was analysed at 200 and 400 ml/s expiratory flow and storage stability was investigated at several time points within the first three hours after collection of the sample. In a preliminary study EBC nitrite was analysed in asthmatic children of different severity.
Results
Surface contamination appears to have a profound influence on nitrite levels and both within-day and inter-day variability is high. We found no flow dependency, and storage stability was satisfying although with considerable variety in several samples. There were no significant differences between the nitrite levels of the different asthmatic subgroups nor between the asthmatic children and the controls.
Conclusions
These data indicate that EBC nitrite is a substance with a wide variety of influencing factors and different sources of origin. This has to be kept in mind when using exhaled nitrite as a biomarker for airway inflammation.

Keywords: Nitrites - analysis, Exhalation - physiology, Child, Equipment Contamination, Specimen Handling - methods, Reproducibility of Results, Breath Tests, Biological Markers - metabolism

Add Comment 0 Comments

Editorial

01 June 2024 : Editorial  

Editorial: Concerns as Highly Pathogenic Avian Influenza (HPAI) Virus of the H5N1 Subtype is Identified in Dairy Cows and Other Mammals

Dinah V. Parums

DOI: 10.12659/MSM.945315

Med Sci Monit 2024; 30:e945315

0:00

In Press

Clinical Research  

Trust and Support for Cancer Research Biobanks: Insights from Cancer Patients in Poland

Med Sci Monit In Press; DOI: 10.12659/MSM.944263  

Clinical Research  

Morphological and Dimensional Analysis of the Nasopalatine Canal: Insights from Cone-Beam Computed Tomograp...

Med Sci Monit In Press; DOI: 10.12659/MSM.944424  

Clinical Research  

Hemorrhagic Cysts in the Pancreas: Risk Factors, Treatment, and Outcomes – Insights from a Single-Center Study

Med Sci Monit In Press; DOI: 10.12659/MSM.941955  

Clinical Research  

Perioperative Administration of Tranexamic Acid and Low Molecular Weight Heparin for Enhanced Blood Managem...

Med Sci Monit In Press; DOI: 10.12659/MSM.944063  

Most Viewed Current Articles

14 Dec 2022 : Clinical Research   1,421,178

Prevalence and Variability of Allergen-Specific Immunoglobulin E in Patients with Elevated Tryptase Levels

DOI :10.12659/MSM.937990

Med Sci Monit 2022; 28:e937990

0:00

17 Jan 2024 : Review article   1,355,487

Vaccination Guidelines for Pregnant Women: Addressing COVID-19 and the Omicron Variant

DOI :10.12659/MSM.942799

Med Sci Monit 2024; 30:e942799

0:00

16 May 2023 : Clinical Research   690,090

Electrophysiological Testing for an Auditory Processing Disorder and Reading Performance in 54 School Stude...

DOI :10.12659/MSM.940387

Med Sci Monit 2023; 29:e940387

0:00

01 Jan 2022 : Editorial   50,113

Editorial: Current Status of Oral Antiviral Drug Treatments for SARS-CoV-2 Infection in Non-Hospitalized Pa...

DOI :10.12659/MSM.935952

Med Sci Monit 2022; 28:e935952

0:00

Your Privacy

We use cookies to ensure the functionality of our website, to personalize content and advertising, to provide social media features, and to analyze our traffic. If you allow us to do so, we also inform our social media, advertising and analysis partners about your use of our website, You can decise for yourself which categories you you want to deny or allow. Please note that based on your settings not all functionalities of the site are available. View our privacy policy.

Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750