Nitric oxide (NO) is produced in the nasal mucosa and in the paranasal sinuses. Increased nasal NO concentrations have been found in patients with asthma and/or rhinitis, and nasal NO has been suggested to be a marker of nasal inflammation. Measuring the stable end products of NO, nitrate and nitrite in nasal lavage fluid have been proposed as an indirect method for measuring NO concentration. The aim of this study was to measure nasal NO concentration, and to find out its relationship to nasal nitrate concentration and clinical parameters. 73 paper-mill workers were investigated with nasal and exhaled NO, nitrate in nasal lavage fluid and were given a respiratory questionnaire. Nasal air was sampled directly from a nasal mask and NO concentration was measured with a chemiluminescence analyser. Exhaled NO was measured with the subjects breathing tidal volumes and wearing nose clips. The nitric oxide metabolites were analysed as nitrate, after reduction of nitrite to nitrate. Smokers had lower nasal NO concentration (264 ppb) as compared to NO concentrations of 340 ppb among non-smokers (p = 0.02). There was no statistically significant relationship between nasal NO concentration and nitrate in nasal lavage fluid or nasal symptoms. Nasal NO concentration was significantly related to FVC (p = 0.047) and there was a relationship with borderline statistical significance (p = 0.06) to FEV1. In conclusion, we found no relationship between nitrate in nasal lavage and nasal NO, and neither of these were correlated to nasal symptoms or to nasal PIF. Nasal NO was significantly lower among smokers. Further controlled studies on subjects with rhinitis are needed, to evaluate the relation between nasal NO and nasal inflammation. In addition, there is also a need to develop methods for measuring nasal NO that minimise contamination from sinuses.
Download full-text PDF |
Source |
|---|
Publication Analysis
Top Keywords
Similar Publications
Investigation of the frequency and selected prevalence factors of equid alphaherpesvirus 4 viremia in horses with acute onset of fever and respiratory signs.
J Vet Diagn Invest
January 2025
Department of Obstetrics, Gynecology and Reproductive Biology, Massachusetts General Hospital, Boston, MA, USA.
Equid alphaherpesvirus 4 (EqAHV4; , ; equine rhinopneumonitis virus) has seldom been associated with complications such as abortion and myeloencephalopathy, given the low tendency of this virus to induce viremia. We investigated the frequency of EqAHV4 viremia in horses with fever and respiratory signs. Case selection included all equids with EqAHV4 quantitative real-time PCR (qPCR)-positive nasal secretions (defined as EqAHV4 qPCR-positive cases) submitted to a diagnostic laboratory.
View Article and Find Full Text PDFAssociation between biosecurity and zoonotic transmission of LA-MRSA CC398 from industrial pig farms to farm workers and their household members.
Occup Environ Med
January 2025
Department of Bacteria, Parasites and Fungi, Statens Serum Institut, Kobenhavn, Denmark.
Background: Zoonotic transmission of livestock-associated methicillin-resistant clonal complex 398 (LA-MRSA CC398) from industrial pig farms to farm workers and their household members and secondary transmission to elderly and immunocompromised persons has led to a growing number of serious infections and even death.
Objective: We tested the hypothesis that conventional pig farms confer a higher risk for LA-MRSA CC398 carriage among farm workers and their household members than specific pathogen-free (SPF) farms, which follow a set of stringent rules concerning biosecurity, health control and transportation of pigs between herds.
Methods: We conducted a cross-sectional study of farm workers and their household members from 25 Danish pig farms positive for LA-MRSA CC398.
Identifying risk factors and developing a nomogram for HFNC failure in patients with hypercapnic acute respiratory failure.
Am J Emerg Med
January 2025
Department of Emergency Department, Northern Jiangsu People's Hospital Affiliated to Yangzhou University, Yangzhou 225001, China. Electronic address:
Background: Currently, there is a deficiency in nomograms specifically designed for predicting the failure of high-flow nasal cannula (HFNC) oxygen therapy in patients with hypercapnic acute respiratory failure (hypercapnic ARF). The aim of this retrospective study is to develop and evaluate a nomogram that assesses the risk of HFNC failure in this patient population.
Methods: Patients with ARF and hypercapnia (PaCO ≥ 45 mmHg in the initial arterial blood gas) who received HFNC in the intensive care unit (ICU) from January 1, 2020 to December 31, 2023 were enrolled in this study.
Prediction of the transient coolant jet released from the nose cone at supersonic flow via machine learning.
Sci Rep
January 2025
Department of Chemical Engineering, Al-Amarah University, Maysan, Iraq.
In this paper, the usage of a predictive surrogate model for the estimate of flow variables in the transient phase of coolant injection from the nose cone by combining the Long Short-Term Memory (LSTM) and Proper Orthogonal Decomposition (POD) technique. The velocity, pressure, and mass fraction of the counterflow jet is evaluated via this hybrid technique and the source of discrepancy of a predictive surrogate model with Full order model is explained in this study. The POD modes for the efficient prediction of the different flow variables are defined.
View Article and Find Full Text PDFPostauricular feather foreign body in an infant.
BMJ Case Rep
January 2025
Ear, Nose and Throat, James Cook University Hospital, Middlesbrough, UK.
A male infant presented with reduced oral intake, low-grade fever and postauricular erythema. Clinical examination revealed a soft, tender swelling posteroinferior to the mastoid tip with a dull tympanic membrane on otoscopy. Cross-sectional imaging did not show any evidence of middle ear infection or mastoiditis.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!