Monitoring of Oral and Nasal Exhaled Nitric Oxide in Eosinophilic Chronic Rhinosinusitis: A Prospective Study
| Autor: | Katsuhiro Hirakawa, Noriaki Noda, Takashi Fukuiri, Sachio Takeno |
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| Rok vydání: | 2012 |
| Předmět: |
Adult
medicine.medical_specialty Chronic rhinosinusitis Nitric Oxide Synthase Type II Nitric Oxide Real-Time Polymerase Chain Reaction Gastroenterology Internal medicine Eosinophilia Eosinophilic otorhinolaryngologic diseases Humans Immunology and Allergy Medicine In patient Prospective Studies Sinusitis Prospective cohort study Aged Rhinitis business.industry General Medicine Middle Aged respiratory system Immunohistochemistry Therapeutic modalities respiratory tract diseases Chronic disease Breath Tests Otorhinolaryngology Chronic Disease Exhaled nitric oxide business |
| Zdroj: | American Journal of Rhinology & Allergy. 26:255-259 |
| ISSN: | 1945-8932 1945-8924 |
| Popis: | Background We aimed to examine the effect of different therapeutic modalities on levels of fractional concentrations of exhaled nitric oxide (FeNO) in patients with eosinophilic chronic rhinosinusitis (ECRS). Methods Thirty-six ECRS patients with nasal polyps were treated either medically or surgically. Oral and nasal FeNO levels were measured using an electrochemical NO analyzer initially and at 1 and 6 months. The mRNA expression and localization of nitric oxide synthase (NOS) isoforms in sinus mucosa and nasal polyps were analyzed by real-time polymerase chain reaction (PCR) and immunohistochemistry. Results The mean oral FeNO levels in the surgical group had decreased significantly from 50.9 to 36.8 ppb 6 months after endoscopic sinus surgery. All patients in this group showed significantly higher nasal FeNO levels after treatment. The mean nasal FeNO levels were 62.3 ppb at 1 month and 93.6 ppb at 6 months. Mean oral and nasal FeNO levels in the medical group after treatment remained unchanged when compared with the baseline levels. Positive immunoreactivity of inducible NOS (iNOS) was observed in both epithelial cells and submucosal inflammatory cells. Real-time PCR analysis showed significant up-regulation of iNOS and IL-5 mRNA expression. Conclusion A combination of oral and nasal FeNO measurements is useful to monitor the extent of inflammation in CRS patients. The increase in nasal FeNO in the surgical group indicates prompt recovery of NO release from healed sinus mucosa through the opened sinus ostia. Reduction of oral FeNO levels may reflect a cessation of the underlying lower airway inflammation that is characteristic of ECRS. |
| Databáze: | OpenAIRE |
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