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Can nasal nitric oxide be a biomarker to differentiate allergic and non-allergic rhinitis?

Abstract

Background

Nasal nitric oxide (nNO), a noninvasive indicator for eosinophilic airway inflammation, has not been adequately studied in different types of rhinitis. The aim of this study was to compare nNO levels between allergic (AR) and non-allergic rhinitis (NAR). Patients were included based on their chronic nasal symptoms. Total nasal symptoms score (TNSS) were evaluated. nNO was measured transnasally with a flow of 5 ml/s from the nostril with an NO analyzer (NIOX MINO; Aerocrine, Sweden). Results were evaluated as parts per billion (ppb).

Results

Four hundred forty-three patients (277 F/166 M)—337 with AR (76%) and 106 with NAR (24%)—were assessed. Patients with AR had significantly higher TNSS, more severe disease, and longer duration of disease compared to NAR group. Allergic rhinitis had significantly higher nNO levels than NAR (370 ppb vs 290 ppb) (p = 0.001). Likewise, significant differences were observed in female gender, in patients with BMI ≥ 25 kg/m2 and those without sinusitis between the two groups. When nNO were further evaluated in comorbid asthma, patients with AR w/o asthma had the highest TNSS and had significantly higher nNO level (p < 0.001). NAR+A group, with the longest duration of rhinitis, was significantly older and had the lowest nNO level (p < 0.001).

Conclusions

This study showed that nNO levels were significantly higher in AR patients than NAR. Although there is no recommended standard threshold for nNO, this study confirmed the utility of nNO in differentiating AR and NAR in addition to its known fast and non-invasive advantages.

Background

Rhinitis is known as an inflammation of the nasal mucosa and estimated to affect almost 200 million people worldwide [1]. This creates indirect costs by loss of work and productivity, as well as a huge burden on society by increasing the needs of medical treatment. Rhinitis can be divided into two different groups, which differ in some features, namely, concomitant allergy (allergic rhinitis [AR]) and non-allergic (non-allergic rhinitis [NAR]), according to allergen sensitivity defined by skin prick tests (SPTs) and/or serum-specific IgE [2]. ARIA guidelines classically categorized AR as intermittent and persistent [3] and classify as mild and moderate-severe. Although AR can be diagnosed by allergy tests, there is still no valid test for the diagnosis of NAR. Furthermore, irrelevant allergen test results with rhinitis symptoms in AR patients and local allergic inflammation in NAR patients makes difficult to differentiate rhinitis phenotypes. Failure in the diagnosis of rhinitis types may result to treatment failure. Moreover, recent advances in clinical awareness and treatment of rhinitis may reduce the risk of asthma. Therefore, different rhinitis subtypes should be distinguished in order to reduce symptoms, improve quality of life, and determine an appropriate treatment strategy to prevent comorbidities [4].

Nitric oxide (NO) was primarily identified as an endothelium-derived relaxant through its efficacy as a vasodilator [2]. Gustafsson et al. was the first that indicated the presence of NO in exhaled air [5]. Today, measuring fractional exhaled NO (FeNO) has become a confirmed tool to monitor eosinophilic airway inflammation and response to inhaled corticosteroids in asthma [6]. However, there are controversial reports about the role of NO in nasal inflammation. Some authors showed increased NO levels in patients with AR, whereas other studies reported no differences [6, 7]. This could be due to regulatory effect of NO on cellular functions in response to variable conditions, such as degree of exposure to allergen; presence of infectious inflammation; undertreatment with corticosteroids; confounding factors such as smoking, asthma, rhinosinusitis, and nasal polyps; and finally the occlusion of sinus ostia. Furthermore, there are studies describing the expression of NO synthase (NOS) in human nasal epithelial cells of patients with AR [8]. Kulkarni et al. showed localized immunoreactivity for nasal NOS in healthy human epithelial cells, olfactory mucosa, olfactory receptor neurons, and multiple nerve fibers [9].

In a previous study, we had compared FeNO levels between allergic and non-allergic rhinitis. Patients with AR—with or without asthma—had insignificantly higher FeNO levels compared to patients with NAR (NAR only and NAR+A) and controls, with no difference between genders. Asthmatics had FeNO values significantly higher than non-asthma in the NAR group, whereas accompanying asthma did not affect FeNO levels in the AR group. We found that rhinitis and comorbid asthma were responsible for increased FeNO regardless of atopy [10]. The rationale of this study was the need of an objective tool in the differentiation of AR and NAR. Thus, the objective of this study was to evaluate the role of nNO in the diagnosis of AR and NAR and the impact of the contributing factors, as well.

Methods

This cross-sectional and prospective study was performed at Allergy and Immunology Department of a tertiary University hospital. Patients who were diagnosed with rhinitis in the allergy outpatient clinic and whose data were complete in accordance with the study criteria were included in this cross-sectional study. The study was approved by the Institutional Local Ethical Committee. Verbal informed consents were obtained from all participants or their parent in the case of children under 16 years. This study involving volunteers was conducted in accordance with the principles of the Declaration of Helsinki II [11], including human-derived material or data leading to the identification of the individual.

Study groups

A total of 443 patients as AR (n, 337) and NAR (n, 106) were enrolled. To be eligible for participation, patients had to meet the following inclusion criteria: age between 16 and ≤ 65 years; persistent/intermittent rhinitis with or without asthma. Patients with concomitant nasal polyposis, infectious or occupational rhinitis, major structural nasal abnormalities, current sinusitis, and those who were pregnant or lactating, start smoking in the last month, those who have had an infection in the last 4 weeks, known acute or chronic systemic diseases were excluded. Also, lack of data and not accepted to participate in the study were excluded from the study.

Diagnosis of rhinitis and asthma

Nasal NO was evaluated in a series of consecutive patients referred for persistent rhinitis, with symptoms lasting at least 4 days/week for 4 consecutive weeks. Rhinitis was diagnosed if the patients had a history of at least two of the following symptoms: nasal itching, sneezing, rhinorrhea, and/or nasal congestion, as described by the Allergic Rhinitis and Its Impact on Asthma guidelines [12]. Asthma was diagnosed based on symptoms with positive reversibility test. All patients’ asthma status was monitored with the Asthma Control Test (ACT) [13]. Patients were divided into three levels based on their response, whereby those diagnosed with partly controlled and uncontrolled asthma were combined into one group, denoted as “poorly controlled asthma,” with “uncontrolled asthma” and “controlled asthma” as the remaining two groups and were enrolled only if they were under regular low dose-inhaled corticosteroid treatment (budesonide or equivalent < 400 mcg/day) and had controlled asthma due to ACT scores (ACT ≥ 20).

The asthma status of all patients was monitored by the Asthma Control Test (ACT). Despite the fact that the ARIA guideline was developed mainly for AR, we classified patients with NAR according to the same definitions to compare the characteristics of these two groups in terms of duration and severity of symptoms.

Study procedure and data collection

At the screening visit, patients were enrolled due to inclusion and exclusion criteria. If the patient was eligible, inclusion visit was performed for the following data collection. Age, gender, duration of rhinitis, and smoking status were noted. Smokers were defined as participants who reported smoking currently and regularly (at least five cigarettes per day). Body mass index (BMI) was calculated by dividing body weight in kilograms by height in square meters (kg/m2). BMI ≥ 25 kg/m2 were classified as overweight and obese, those with BMI < 25 kg/m2 were evaluated in two groups as normal and underweight. Patients with a positive SPT (induration of ≥ 3 mm in diameter) and/or specific IgE (≥ 0.35 kU/L) against aeroallergens consistent with the complaints were defined as AR, and those with negative prick test and specific IgE were defined as NAR. Patients with asthma in the AR and NAR groups were further analyzed as subgroups of AR+A and NAR+A.

Nasal symptoms were evaluated on a 4-point scale from 0 to 3 (Table 1) [14]. Total nasal symptom score (TNSS) was calculated as the sum of four symptoms with a range of 0-12.

Table 1 Four-point scale used to evaluate the severity of nasal symptoms in study groups

Nitric oxide measurement

Nasal NO was measured using a nasal cannula inserted into the nostril. The subject was then asked to take a deep breath, close his mouth, and hold his breath. The breath was not given at least for 30 s than given throughout the nose slowly. The subjects were asked to repeat this maneuver three times, and the best of these measurements was accepted as NO level in the nose. The ambient NO level was recorded before each maneuver. The patients were excluded if the subjects could not hold their breath or the presence of nasal polyps was detected during administration. It was measured with using a chemiluminescence analyzer (NIOX® MINO analyzer; Aerocrine® AB, Sweden). The nNO measurements of the patients were made in the off-season time (October-December) at around 9-10 a.m. using the same analyzer as the respiratory method described as resting for 30 min. The analysis was made by confirming that the patients did not drink alcohol for at least 4 h before the test, that women did not take any food supplements containing l-arginine or a nitrate-rich or nitrate-restricted diet, and that there were no signs of infection.

Statistical analysis

Statistical analysis was conducted using the SPSS software version 23.0 (SPSS, Inc., Chicago, Illinois). Variables were analyzed using visual and analytical methods to determine if they were normally distributed. Mean and standard deviation or median and interquartile ranges were used for descriptive statistics; also, number and % were used for categorical variables. Chi-square test was used to compare nominal and categorical variables. Parametric data were compared using T test and non-parametric data with Mann–Whitney U test. Correlation analysis was applied using Spearman and Pearson tests according to distribution. A two-sided p value < 0.05 was considered statistically significant.

Also, four group analysis was performed according to whether the patients had asthma or not. Mean values of variables with normal distribution were tested with one-way ANOVA test, and abnormally distributed variables were analyzed with Kruskal-Wallis test. According to Bonferroni correction in post hoc analysis, the value was taken as 0.0125. When general importance was observed, Tukey and Tamhane post hoc tests were performed according to the homogeneity analysis of the variances.

Results

A total of 443 patients (277 F/166 M); 337 with AR (76%) and 106 with NAR (24%) were evaluated. All patients underwent a stepwise diagnostic approach according to the ARIA, resulting in the following subgroups: AR only, NAR only, AR+asthma, and NAR+asthma. The clinical and demographic features of groups were shown in Table 2.

Table 2 Demographic and clinical characteristics of study groups (AR-NAR)

Although patients with AR were significantly younger than non-allergic patients, the duration of rhinitis was significantly longer (5 year, 3 year) (p = 0.037). Moreover, allergic patients had more intermittent, moderate to severe disease (> 60%). Of 337 patients with AR and 106 patients with NAR, asthma comorbidity was found to be 14.4% and 12.3%, respectively (p = 0.789) with no differences between the study groups. In allergic rhinitis, group 3 were positive with latex, 13 with cat-dog, 22 with mold, 24 with blatella, 75 with mite, and the rest with pollen.

Patients with AR had significantly higher nNO levels compared to NAR (370 ppb vs 290 ppb) (p = 0.001). When the patients were evaluated according to their gender, female subjects in the AR group had significantly higher nNO than NAR group (370 ppb vs 302 ppb, p = 0.006). Likewise, significant differences were observed in patients with BMI ≥ 25 kg/m2 and those without sinusitis between the two groups (Table 3). Also, comparison of nNO in study groups was shown in Fig. 1.

Table 3 NO levels according to demographic variables in AR and NAR
Fig. 1
figure 1

Comparison of nNO in study groups

As the presence of asthma comorbidity in rhinitis is an important factor, the results were further analyzed in 4 groups (Table 4). Patients with AR w/o asthma had not only the highest TNSS but also had significantly higher nNO level (p < 0.001). It was observed that NAR+A group—with the longest duration of rhinitis—was significantly older and had the lowest nNO level. No differences were observed regarding BMI and TNSS with in the study groups.

Table 4 Characteristics of the study groups according to comorbid asthma

Significant relationships were observed between nNO levels and variables. Nasal NO was significantly correlated with rhinitis duration and TNSS (r = −0.098, r = 0.111; p = 0.036, p = 0.02, respectively) (Fig. 2). When analyzed separately, nNO was inversely related with increased age (r = −0.21, p = 0.03) only in NAR group. Subgroup analysis of AR patients showed that nNO levels measured during the season showed significant difference from off-season values (414 ppb vs 270 ppb) (p < 0.001).

Fig. 2
figure 2

Correlation between nNO, TNSS, and rhinitis duration

Since the duration and severity of rhinitis, as well as the nasal symptoms of our patients showed some differences, we decided to evaluate the effect of the results in two groups comparatively by applying a logistic regression model for all these variables (sex, age, smoking habits, BMI, asthma onset, various allergen sensitizations, rhinitis duration, rhinitis severity, nasal symptoms). Although linear and logistic regression models were applied to assess between various outcomes, we could not find any relationship in tested results.

Discussion

Because the diagnosis and therapeutic management of allergic airways disease requires monitoring of inflammation as precisely as possible, we tested whether nasal NO could be a reliable AR-NAR discriminator. The idea of nNO measurement is based on “one airway - one disease” concept. Even though asthma and allergic rhinitis vary with the clinical phenotype, Th1/Th2 signaling, main cellular, and biochemical profile, they share the main pathogenetic features [15]. One of them is eosinophilic inflammation that increases the expression of inducible NO synthase (iNOS), leading to increased production of nitric oxide [16]. Therefore, exhaled NO in asthma is a well-defined indicator but studies about nNO as a marker of allergic rhinitis share conflicting evidence [7].

The aim of this study was to investigate nNO levels and the factors affecting the patients with different etiologies (allergic vs non-allergic). In addition, we evaluated the effect of comorbid asthma in eosinophilic airway inflammation with nNO measurement. Takeno et al. found that generally higher nNO levels are produced in the nasal epithelial cells of allergic patients through co-expression of different isoforms (iNOS and endothelial NOS) [17]. In our present study, patients with AR were found to have significantly higher nNO levels compared to NAR consistent with the previous reports. Moody et al. found that nNO levels were higher in allergic patients but were not elevated in perennial rhinitis, as was found in our study (results not shown) [18]. It is known that nasal NO was higher in AR patients, but in those studies, nNO was compared with the control group. As was speculated by Liu et al., different pathogenetic mechanisms of neurogenic inflammation in NAR and IgE-mediated inflammation in AR may probably be responsible for different nNO levels [19].

In a study performed by Martina et al. who examined FeNO and nNO, gender-related differences were found in the FeNO, but not in the nNO levels neither for control nor for allergic rhinitis groups [20]. In consistent with the literature, when our patients were evaluated according to their gender, female subjects in the AR group had significantly higher nNO levels compared to those of NAR group, but no such difference was found within the groups. The higher nNO in female gender in AR suggests the production and role of this biomarker other than IgE-mediated inflammation, as it can be a consequence of different sensitivity of NO synthase isoforms to estrogen [21].

It is widely known that asthma and AR often coexist in the same subjects [22]. Approximately 80% of patients with asthma are affected by AR and 10-40% of AR subjects have asthma [23]. In a study conducted by Gupta et al., it was determined that the adult patient group with bronchial asthma and AR had a higher nNO level compared to the control group [24]. It was also stated that these patients had higher nNO levels compared to AR patients, but their findings were not statistically significant. On the other hand, in another study, a significant difference was observed in the nNO level measured using an electrochemical analyzer [25]. Sergei et al. found that in patients with rhinitis accompanied by asthma who were not receiving nasal or inhaled steroid therapy, nNO was significantly elevated [26]. Despite these conflicting results in our study, although no significant difference was found between AR and AR+A groups, nNO level was found to be significantly lower in the NAR group with comorbid asthma. Although most of our allergic patients were sensitized with seasonal allergens, i.e., pollens, those with AR+A had on regular inhaled steroid treatment, all-year round, may have lowered nNO levels. In order to optimize our study, we had measured nNO levels in patients who were followed-up for at least 6 months, which leads to the fact that non-allergic rhinitis with asthma regularly took inhaled steroid therapy, as well. Another explanation of the lower nNO in NAR patients with asthma may also be due to relatively small number of this subgroup.

Nasal NO was higher in AR patients without being affected by BMI, comorbid asthma, and/or sinusitis. However, the low nNO levels in NAR patients were more pronounced in higher BMI, inversely correlated with comorbid asthma and/or sinusitis, suggest that nNO can be affected by many factors.

Nasal NO is affected by season, time points of the day, physical exercise, respiratory method, and analyzers [27,28,29,30]. Most of the published articles have not fully identified or made any effort to control the above external factors. This not only magnifies the alteration in a single study but also leads to a lack of comparability between different studies. To minimize the variation caused by these factors, the current study was handled by the same qualified technician who performed all measurements of nNO using the same analyzer at the same time of the day after the participants rest for at least 30 min.

An important limitation of our study was the lack of control group, as we specifically aimed to compare allergic and non-allergic patients with rhinitis. We did not perform paranasal CT in the patients because paranasal CT did not have a place in the clinic in the distinction of AR-NAR, and the lack of routine endoscopic nasal examination was another limitation of the study.

Although nNO was studied previously in AR patients, to our knowledge, this study is the first one to show a significant difference between AR and NAR with or without asthma. Nasal NO may be valuable in distinguishing between allergic rhinitis as we found a significant difference compared to NAR group. nNO could be accepted as a reliable biomarker and a validated tool for the measurement of eosinophilic airway inflammation. Further studies regarding nNO and its relation to allergic and non-allergic inflammation of upper/lower airways are warranted.

Conclusion

Nasal NO has not been adequately studied in upper airways. We found that nNO was significantly higher in AR patients than NAR. Although the standardization of nNO levels is difficult due to the various factors that it is cheap, painless, and fast, we think that our results seem to be sufficient to distinguish between these two diseases. We recommend that measurement of nasal nitric oxide is not only sufficient to distinguish between AR and NAR but also an applicable tool in clinical practice.

Availability of data and materials

The datasets used and analyzed during the current study are available from the corresponding author on reasonable request.

Abbreviations

AR:

Allergic rhinitis

AR+A:

Allergic rhinitis + asthma

BMI:

Body mass index

F:

Female

FeNO:

Fractional exhaled nitric oxide

iNOS:

Inducible nitric oxide synthase

M:

Male

NAR:

Non-allergic rhinitis

NAR+A:

Non-allergic rhinitis + asthma

nNo:

Nasal nitric oxide

SPTs:

Skin prick tests

TNSS:

Total nasal symptom score

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Acknowledgements

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Concept and design of study: FK, AB, SAY. Analysis and interpretation of data: FK, AB, SAY. Drafting and critical revision: FK, AB, SAY. All authors read and approved the final version of the manuscript.

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Correspondence to S. A. Yalim.

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The study protocol complied with the ethical principles of the Declaration of Helsinki and received full approval from the institutional review boards of Institutional Kirikkale University Ethics Committee (No: 24/05, Date: 20.10.2014). Verbal informed consents were obtained from all participants or their parents in the case of children under 16 years.

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Kalpaklioglu, A.F., Baccioglu, A. & Yalim, S.A. Can nasal nitric oxide be a biomarker to differentiate allergic and non-allergic rhinitis?. Egypt J Otolaryngol 37, 91 (2021). https://doi.org/10.1186/s43163-021-00154-1

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