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Selected articles

Asociación nula entre la concentración de 25-hidroxivitamina D y la rinitis alérgica, sensibilización alérgica y rinitis no alérgica

By | Artículos seleccionados, New, Selected articles

Qi Feng, Klaus Bønelykke, Weronica Ek, Bo CHawes, Shuai Yuan, Ching Cheung, Gloria Li, Raymond Leung, Bernard Cheung

Clin Exp Allergy. 2020 Sep 18. doi: 10.1111/cea.13739. Online ahead of print.

Allergic rhinitis and allergic sensitization are the most common and prevalent allergic conditions in the world. It has been suggested that serum 25-hydroxyvitamin D might have a role in immunomodulation and, consequently, in allergic rhinitis and allergic sensitization. This study aimed to assess a causal association between 25-hydroxyvitamin D levels and risk of allergic rhinitis or allergic sensitization, using two-sample Mendelian randomization (MR) approach.

Instrumental variables identified seven single nucleotide polymorphisms (SNPs) associated with serum 25-hydroxyvitamin D levels. The primary objective was allergic rhinitis, and the secondary objectives were allergic sensitization and non-allergic rhinitis. Two cohort studies provided the genome-wide association summary statistics of the outcomes. MR analysis with a random-effects inverse variance weighted method was performed as the primary analysis to estimate the overall effect size. Sensitivity analysis using the weighted median method and MR-Egger regression method was conducted. A subgroup analysis based on 25-hydroxyvitamin D synthesis-SNPs was also applied.

There wasn’t a causal association between serum 25-hydroxyvitamin D and risk of allergic rhinitis, and subgroup analysis also showed no relation between 25-hydroxyvitamin D synthesis-related SNPs and outcomes. The same results were obtained for sensitivity analysis.

In conclusion, this study did not find any evidence that supports a causal association between serum 25-hydroxyvitamin D levels and risk of allergic rhinitis, allergic sensitization, or non-allergic rhinitis in the European-ancestry population. This conclusion is against the use of vitamin D supplementation for the prevention of allergic diseases.

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para identificar personas con rinitis alérgica.

Can we identify allergic rhinitis from administrative data: A validation study

By | New, Selected articles

Katja Biering Leth-Møller, Tea Skaaby, Flemming Madsen, Janne Petersen

Pharmacoepidemiol Drug Saf. 2020 Sep 23. doi: 10.1002/pds.5120. Online ahead of print.

The prevalence of allergic rhinitis has been increasing, with more than one in five people being affected. The objective of this study was to evaluate the validity of 13 different Danish prescription algorithms and hospital data to identify people with allergic rhinitis.

This study included 10 653 Danish adults in two time periods. Investigators used a positive serum-specific IgE and self-reported nasal symptoms as the primary gold-standard of allergic rhinitis. The secondary gold standard of allergic rhinitis was self-reported physician diagnosis. They calculated sensitivity, specificity, positive predictive value (PPV), negative predictive value, and corresponding 95 % confidence intervals for each register-based algorithm in the two periods.

All algorithms had a low sensitivity, irrespective of the definition of allergic rhinitis or period. The highest positive predictive values were achieved for algorithms that required antihistamines and intranasal corticosteroids, with a value of 0.69 (0.62 – 0.75) and a corresponding sensitivity of 0.10 (0.09 – 0.12) for the primary gold standard of allergic rhinitis.

In conclusion, due to the low use of prescription medication among those with allergic rhinitis, sensitivity was low (≤ 0.40) for all algorithms irrespectively of the definition of allergic rhinitis. Algorithms based on antihistamines and intranasal corticosteroids granted the highest PPVs. Nevertheless, PPVs were still moderate, due to low sensitivity, when applying a strict gold standard (sIgE and nasal symptoms). Studies using administrative data must consider how to reliably identify allergic rhinitis, for example, using different data sources, and how a potential misclassification will

impact their results.

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Positive effect of Helicobacter pylori treatment on outcome of patients with chronic spontaneous urticaria

By | New, Selected articles

Mohammed Elhendawy, Maha Hagras, Shaimaa Soliman, Engi Seif Shaker

Am J Clin Pathol. 2020 Sep 17;aqaa134. doi: 10.1093/ajcp/aqaa134. Online ahead of print.

People with chronic urticaria have chronic hives, itching, and wheels that come and go for long periods. Chronic spontaneous urticaria represents 80 – 90 % of chronic urticaria cases, and the release of histamine and other inflammatory mediators from mast cells and basophils may be immunoglobulin E (IgE)–mediated or non-IgE-mediated. Helicobacter pylori is a gram-negative bacterium with a high prevalence worldwide, and that persistently colonizes the stomach. Its presence is associated with an increased risk of peptic ulcer and gastric cancer. The association between Helicobacter pylori and chronic spontaneous urticaria is controversial. This study’s objective was to assess the relationship between Helicobacter pylori eradication therapy and chronic spontaneous urticaria remission.

This was a randomized, double-blind, placebo-controlled pilot study that included 72 patients with urticaria. From these, 27 were positive for Helicobacter pylori stool antigen and PCR in gastric biopsy and were randomly assigned to receive anti-Helicobacter pylori treatment or placebo.

Participants with Helicobacter pylori had significantly lower hemoglobin concentrations with microcytic hypochromic anemia and a significantly higher occurrence of dyspepsia symptoms. All Helicobacter pylori patients (except 2) had significant improvement of the urticaria itching and red wheals after two weeks of therapy compared to placebo.

This study showed an association between chronic spontaneous urticaria and the presence of Helicobacter pylori in the gastric tissue. Patients with urticaria who do not respond to usual chronic urticaria treatment should be tested for Helicobacter pylori as therapy of Helicobacter pylori showed to improve the symptoms of chronic spontaneous urticaria.

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Avances y desarrollos novedosos en la rinitis alérgica

Advances and novel developments in allergic rhinitis

By | New, Selected articles

Yifan Meng, Chengshuo Wang, Luo Zhang

Allergy. 2020 Sep 9. doi: 10.1111/all.14586. Online ahead of print.

Allergic rhinitis is a condition of the upper airways, with a high prevalence worldwide, characterized by symptoms such as nasal obstruction, rhinorrhea, sneezing, and nasal pruritus. This is due to inhaled allergens and respective mucosal inflammation. This review’s objective was to highlight novel mechanisms and treatments of allergic rhinitis to optimize its management.

Proteins such as histone deacetylase (HDAC) and mucin 1 (MUC1) have a role in the epithelial tight junction barrier’s integrity. Inflammatory mediators, such as type 2 innate lymphoid cells (ILC2), myeloid dendritic cells (mDC), and plasmacytoid dendritic cells (pDC), are involved in the development of allergic rhinitis. Other risk factors include genetic susceptibility, age, intrauterine growth restriction, fetal oxidative balance, diet, environmental changes, and essential roles in allergic rhinitis.

Management of allergic rhinitis includes patient education, pharmacotherapy, allergen-specific immunotherapy, and biologics. Novel therapies include highly purified allergens, allergoids, peptides, and new adjuvants for use in specific allergen immunotherapy and specific monoclonal antibodies for blocking the effects of immune mediators.

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This study aimed to compare the gastrointestinal composition between adults and children suffering from allergic rhinitis.

Comparison of the gastrointestinal composition between adults and children suffering from allergic rhinitis

By | New, Selected articles

Annabelle M Watts; Nicholas West; Ping Zhang; Peter Smith; Allan Cripps; Amanda Cox

Int Arch Allergy Immunol. 2020 Sep 24;1-12. doi: 10.1159/000510536. Online ahead of print.

The gut microbiota has an essential role in the development and regulation of local and systemic immunity. Allergic rhinitis, such as various immune-mediated conditions, has been associated with abnormal gut microbial colonization patterns in children; however, there is not enough data regarding adults. This study aimed to compare the gastrointestinal composition between adults and children who suffer from allergic rhinitis.

This was a cross-sectional study that included 57 adults with allergic rhinitis and 23 healthy controls. Investigators compared samples of their stools via next-generation sequencing of the V3-V4 hypervariable regions of the 16S rRNA gene. Investigators used a reference-based approach with the NCBI database to taxonomic classification and identity approach.

Participants with allergic rhinitis had a significant reduction in species richness. They also had declines in operational taxonomic unit counts and diversity indices. In contrast, they had significantly more Bacteroidetes than healthy controls, as well as an increased abundance of Parabacteroides and a reduced abundance of Oxalobacter and Clostriadiales.

Adults with allergic rhinitis have a different gut microbiome than healthy controls, with reduced microbial diversity and altered abundance of some microbes. Identifying the metabolites and mechanisms underlying the relationship microbiota-host will improve how the gut microbiome composition regulates immunity and may be of interest to potential therapeutic options for allergies.

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rinitis 1990-2010

Comparison of allergens and symptoms in patients with allergic rhinitis between 1990s and 2010s

By | New, Selected articles

Ji Heui Kim, Shin Ae Kim, Ja Yoon Ku, Won Ki Cho and Chol Ho Shin

Allergy Asthma Clin Immunol. 2020 Jul 1;16:58. doi: 10.1186/s13223-020-00455-9. eCollection 2020.

Allergic rhinitis is a common chronic upper airway inflammatory disease characterized by nasal obstruction, rhinorrhea, sneezing, and itching of the eyes/nose. Its prevalence has been increasing steadily in Korea. Although Korean people’s lifestyle and environment have been changing, the corresponding changes in the characteristics of allergic rhinitis have not been documented. This study’s objective was to describe the changes in allergens and clinical manifestations of allergic rhinitis in Korean patients between 1990 and 2010.

Patients diagnosed with allergic rhinitis in 1990 and 2010 were evaluated and answered a symptom questionnaire. The two sets of patients were compared regarding the differences in allergens and the results of the questionnaire.

Compared with the set of 1990 patients, the rate of sensitization to house dust mites, cockroaches, Aspergillus, Alternaria, and tree pollen significantly increased, and that to cat fur significantly decreased in patients from the 2010s (p < 0,05). The distribution of patients with moderate-to-severe nasal obstruction and itching of the eyes/nose increased (p < 0,05), as well as that of patients with minor symptoms, such as olfactory disturbances, cough, sore throat, and fatigue (p < 0,01).

In conclusion, Korean people with allergic rhinitis from 2010 have different symptom severity and allergen reactivity and type. These results may reflect changes in Korea’s environmental conditions and lifestyle, which may be useful for patient counseling and management.

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Rinitis alérgica

Perception and control of allergic rhinitis in primary care

By | New, Selected articles

Pascal Demoly, Isabelle Bossé and Pascal Maigret

NPJ Prim Care Respir Med. 2020 Aug 20;30(1):37. doi: 10.1038/s41533-020-00195-8.

People with chronic diseases behave according to their perception of the disease, which may impact treatment results. The prevalence of allergic rhinitis is high, around 400 million people worldwide. However, it is poorly self-recognized by patients, as well as it is poorly controlled. The PETRA study’s objective was to evaluate the management of allergic rhinitis by patients and their general practitioners and to describe the relationship between disease perception, patient behavior, and treatment outcomes.

The PETRA study was a cross-sectional study that included 2001 participants between May and October 2017. The study’s main objective was to precisely identify and describe factors associated with a poor perception of the disease in people with allergic rhinitis. 201 French general practitioners selected 1929 patients for analysis (mean age: 39 years; intermittent/persistent symptoms: 46.2/52.3%). 71,7% of the participants had uncontrolled allergic rhinitis (ARCT score < 20), 53,6% had a good perception of their illness (BIPQ score < 5), and 14,1% of the patients had also been diagnosed with asthma.

A poor perception of allergic rhinitis was related to ear, nose, and throat complications, nasal pruritus, uncontrolled allergic rhinitis, and asthma. Also, there was a strong negative correlation between the BIPQ and ARCT scores: the poorer the patient’s perception, the less the disease was controlled.

In conclusion, the PETRA cohort included a high proportion of patients with moderate to severe allergic rhinitis symptoms and a low disease control level. It was shown that many patients were not satisfied with their treatment and did not perceive their disease very well. Although no causal relationship could be drawn from this study, results suggest that improving the perception of allergic rhinitis could be beneficial and lead to better control of symptoms.

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Cansancio, urticaria y mujeres

Fatigue is Common and Predicted by Female Gender and Sleep Disturbance in Patients with Chronic Spontaneous Urticaria

By | New, Selected articles

Kemal Erol, Sule Ketenci Ertas, Ragıp Ertas

J Allergy Clin Immunol Pract . 2020 Aug 25;S2213-2198(20)30836-9. doi: 10.1016/j.jaip.2020.08.020. Online ahead of print.

Chronic spontaneous urticaria is a chronic disease characterized by wheals and pruritus and/or angioedema. Most urticaria patients are women who have their quality of life reduced due to the impact of the disease on daily life and sleep quality. Fatigue is a common symptom in urticaria. This study’s objective was to assess fatigue and how it affects people with chronic spontaneous urticaria compared to healthy people.

This study included 103 patients with chronic spontaneous urticaria and 35 age and gender-matched healthy controls. They were assessed for fatigue with the Fatigue Severity Scale (FSS) and VAS-Fatigue. Duration, activity, and control of disease, as well as anxiety, depression, and quality of life, were also evaluated.

No significant associations were seen in disease activity, disease control scores, FSS, positivity for anti-nuclear antibodies, and IgE levels between fatigued and non-fatigued patients with urticaria. Fatigued patients had significantly higher CRP levels (p=0,009). Also of note was the significant correlation between total FSS score and chronic urticaria quality of life in patients with chronic spontaneous urticaria, where women with urticaria and with disturbed sleep complained of fatigue.

Women with chronic spontaneous urticaria commonly experience fatigue, which is an important symptom that negatively affects their quality of life.

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Urticaria Crónica Espontánea

Targeted Therapy for Chronic Spontaneous Urticaria: Rationale and Recent Progress

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Ana M. Giménez‑Arnau, Andaç Salman

Drugs . 2020 Aug 28. doi: 10.1007/s40265-020-01387-9. Online ahead of print.

Chronic spontaneous urticaria is characterized by wheals, angioedema, or both for at least 6 weeks and can last for a long time, up to 5 years. The effects of chronic spontaneous urticaria on quality of life are comparable to psoriasis, atopic dermatitis, or even ischemic heart disease.

Antihistamines continue to be the first choice for treatment of urticaria, however rates of response are low (ranging from 38.6% in standard doses to 63.2% in higher doses), some patients don’t experience a complete of symptoms. The use of omalizumab has shown a major advance in treating patients with chronic spontaneous urticaria, however, there is a subgroup of patients who have a partial or even lack of response to omalizumab.

Some of the upcoming targeted therapies for chronic spontaneous urticaria include:

  1. anti-IgE antibodies, such as ligelizumab, a monoclonal antibody directed against the Cε3 domain of IgE and which has shown a six- to ninefold greater potency in vivo compared to omalizumab; UB-221, another monoclonal antibody against IgE with up to eightfold greater affinity for free IgE, compared to omalizumab; quilizumab, a humanized monoclonal antibody directed against membrane-bound IgE.
  2. Anti-Siglec-8. Siglecs are a transmembrane family with regulatory effects on intercellular and intracellular signaling, with Siglec-8 having expression on eosinophils and mast cells.
  3. Bruton’s Tyrosine Kinase (BTK) inhibitors. BTK is a tyrosine kinase expressed in hematopoietic cells, including macrophages, mast cells and basophils. BTK inhibitors are used to treat different malignancies of B-cell origin. Ibrutinib, dasatinib, AVL-292 and CNX-774 effectively suppressed IgE-induced activation and histamine release from basophils and mast cells.
  4. Chemoattractant receptor-homologous molecule expresses on Th2 (CRTH2) inhibitors; Spleen Tyrosine Kinase (SYK) inhibitors; Anti-CD20; Anti-IL-1; Anti-IL-4/13; and Anti-IL-5.

The future treatment of chronic urticaria will probably change once potential new treatments are completely developed.

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rinitis alérgica y covid-19

Clinical presentation at the onset of COVID-19 and allergic rhinoconjunctivitis

By | New, Selected articles

Fabio Ferreli, Francesca Gaino, Elena Russo, Matteo Di Bari, Francesca Pirola, Andrea Costantino, Luca Malvezzi, Armando De Virgilio, Giovanni Colombo, Giovanni Paoletti, Emanuela Morenghi, Giorgio Walter Canonica, Giuseppe Spriano, Enrico Heffler, Giuseppe Mercante

J Allergy Clin Immunol Pract . 2020 Aug 18;S2213-2198(20)30823-0. doi: 10.1016/j.jaip.2020.08.009. Online ahead of print.

COVID-19 is characterized by various clinical conditions, from mild symptoms to pneumonia and death. Mild symptoms, such as nasal and ocular manifestations, can be confused with allergic rhinoconjunctivitis at the onset. This article describes the differences that let one distinguish COVID-19 and allergic rhinoconjunctivitis.

This study included 204 patients that were infected with coronavirus were included. They were retrospectively studied via telephone interview, where they were requested to complete a validated questionnaire, The Mini Rhinoconjunctivitis Quality of Life Questionnaire (MiniRQLQ), which evaluated a series of 14 signs and symptoms on a scale from 0 to 6, indicating “not troubled” and “extremely troubled”, respectively. Patients were also asked to compare the manifestations of their last allergic symptomatic period with COVID-19 manifestations and to evaluate their sense of taste and/or smell.

Among all 204 participants, 22 were also affected by allergic rhinoconjunctivitis. Clinical manifestations of allergic rhinoconjunctivitis compared with those at the onset of COVID-19 were defined as “completely different” by 15 patients (68,2%), “different” by 3 (13.6%), and “similar” by 4 (18,2%). The two clinical presentations were never reported as “identical”.

Although COVID-19 may present some overlap in symptoms with seasonal allergies, the MiniRQLQ scored significantly different between allergic rhinoconjunctivitis and COVID-19. Also, in this study, there were no differences in taste and smell dysfunction reported. Patients with allergic rhinoconjunctivitis are familiar with its symptoms and were able to distinguish them from COVID-19 rhinoconjunctival manifestations.

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