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Case Report
Revised

Case Report: Resolution of chronic urticaria following treatment of odontogenic infection

[version 3; peer review: 3 approved]
PUBLISHED 06 Jun 2019
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Abstract

Background: Chronic spontaneous urticaria (CSU) is a condition characterised by the presence of hives with/without angioedema, that affects individuals on more days than not for 6 weeks or more. The role of infection as a potential trigger for CSU is well described, but the current clinical guidelines do not recommend routine screening for underlying infections.
Main observations: We report a case of severe prolonged chronic spontaneous urticaria in a 19-year-old, that went into rapid remission following the treatment of dental infection.
Conclusions: Clinicians should recognise the potential role that infection can have in causing chronic urticaria. There should be a low threshold to treat infection in such circumstances.

Keywords

Chronic Spontaneous Urticaria, Dental Infection

Revised Amendments from Version 2

We have made some minor changes. The maximum UAS7 score is now stated as 42. We have also cited the latest EAACI Urticaria Guidelines.

To read any peer review reports and author responses for this article, follow the "read" links in the Open Peer Review table.

Introduction

Urticaria is a dermatological disorder that manifests as raised erythematous lesions that range in size. They are pruritic and typically resolve with no changes to the appearance of the skin. Urticarial lesions may be associated with episodes of swellings known as ‘angioedema’. The role of infection as a potential trigger for urticaria and angioedema is well described but the precise mechanism by which infection induces release of histamine from mast cells is unknown. Infections, including dental infections, have been associated with urticaria; however, current chronic urticaria guidelines do not recommend routine screening for underlying infection1,2. Instead, they advise targeted investigations, based on the clinical history and examination findings. We report a case of severe chronic spontaneous urticaria that rapidly resolved following root canal treatment.

Case report

A 19-year-old male patient was referred to the Immunology clinic by his General Practitioner (GP). He presented with a two-month history of urticaria with intermittent episodes of angioedema. His initial symptoms included facial pruritis, periorbital erythema and angioedema involving the upper and lower lips. Within 30 minutes of his first episode of angioedema, he developed widespread urticaria which responded to treatment with antihistamines. The following day, he experienced a recurrence of the symptoms and continued to have almost daily symptoms of urticaria with intermittent episodes of angioedema. He was commenced on an alternative anti-histamine by his GP but continued to develop urticaria and experience swellings of the hands and feet. His treatment was escalated at his initial visit to Immunology Clinic to fexofenadine 180mg twice a day with an additional 10–20mg of cetirizine. In addition, montelukast, a leukotriene receptor antagonist, was commenced.

The number of hives and degree of pruritis were graded using an objective scoring system known as the Urticaria Activity Score 7 (UAS7) that provides a weekly average score out of a maximum score of 42. The patient recorded weekly UAS7 scores of 30, despite treatment with maximum doses of antihistamines and montelukast. Therefore, Anti-IgE therapy with the monoclonal antibody ‘Omalizumab’ was offered. In the interim, he presented to his dentist with a broken tooth and was found to have carious molars requiring root canal treatment. One week after this intervention, his UAS7 score fell to 4 and then to 0, and he has remained in remission (UAS 7 score 0) for 9 months. As he was rather needle-phobic, he was delighted that this obviated the need for Omalizumab injections. Initial investigations including full blood count, renal function, liver function and thyroid function tests were all within the normal ranges.

Discussion

Chronic spontaneous urticaria (CSU) is defined as daily or almost daily urticaria for at least 6 weeks1. In up to 50% of patients, urticaria may be associated with episodes of angioedema3. These features are the result of degranulation of mast cells with the release of granule contents, predominantly histamine. Patients often present to their GP and are referred for further assessment and management by Immunologists, Allergists or Dermatologists when first line treatment with antihistamines fail to control the symptoms. The mainstay of treatment is high dose antihistamines and leukotriene receptor antagonists1. In recent years, the anti-IgE monoclonal antibody therapy, Omalizumab, has been used as an effective treatment for patients who fail to respond to first and second line therapy.

In cases of CSU, triggers such as food-based allergens or airborne allergens are rarely implicated4. In acute urticaria (defined as having a duration of less than 6 weeks), causes are more likely to be identified. In one study of 79 cases of acute urticaria, 36.7% were secondary to infection5.

A number of studies have demonstrated an increased prevalence of oropharyngeal infections including dental infections, sinusitis and tonsillitis in patients with chronic urticaria3,6,7. An early study from 1964 demonstrated radiological evidence of focal dental infection in 29% of their cohort of patients with chronic urticaria3. In addition, cases have been reported of resolution of urticaria after treatment of dental infections8,9. In one case bacterial cultures from dental lesions grew the gram-negative bacteria Veillonella parvula10. It is thought that Lipopolysaccharide from gram negative bacteria induces an inflammatory response characterised by histamine release from mast cells and resulting urticaria11.

Other infections reported to be associated with CSU include Helicobacter pylori which is known to have immunomodulatory effects12. However, H. pylori eradication in CSU patients has had mixed results1315. Infection with viral hepatitis has also been associated with CSU16,17 and guidelines suggest performing a hepatitis screen if transaminases are abnormal1. However, a systematic review on the subject revealed that the prevalence of hepatitis B and hepatitis C was no greater in CSU patients than compared with the general population18.

The presented case history demonstrates the close temporal relationship between treatment of dental infection and the improvement of urticaria and reduction in medication requirements. Inflammatory markers were not monitored in this case but may have been elevated19. Measurement of markers of the acute inflammatory response, including CRP, can easily be included in assessment of patients with chronic urticaria. Together with a careful history, an elevation in acute inflammatory markers, may highlight the presence of infection/inflammation. Where infection has been excluded, the elevated inflammatory markers may identify patients with more severe chronic urticaria20.

Our patient had failed first and second line treatments for chronic urticaria with persistent and troublesome symptoms. With a UAS 7 >28, demonstrating poorly controlled chronic urticaria, he was eligible to commence anti-IgE therapy21. Monoclonal antibody anti-IgE treatment with Omalizumab is now provided by some immunology and dermatology units in the UK. Patients are given Omalizumab by sub-cutaneous injection once a month for 6 months, and their response is monitored throughout. Although relatively safe, any new treatment is not without the risk of side effects. In addition, the treatment is costly, and should be reserved for patients who have severe CSU that fail to respond to treatment with the maximum dose of anti-histamine treatment and leukotriene receptor antagonists.

Our case history illustrates the importance of searching for infections, including odontogenic infections, prior to commencing immunosuppression or anti-IgE therapy in patients who are resistant to first line treatment of CSU.

Consent

Written informed consent was obtained from the patient for the publication of their clinical details.

Data availability

No data is associated with this article.

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Version 3
VERSION 3 PUBLISHED 02 Nov 2018
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CITE
how to cite this article
Tadros S, Bahal S and Nagendran V. Case Report: Resolution of chronic urticaria following treatment of odontogenic infection [version 3; peer review: 3 approved]. F1000Research 2019, 7:1738 (https://doi.org/10.12688/f1000research.16836.3)
NOTE: If applicable, it is important to ensure the information in square brackets after the title is included in all citations of this article.
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Open Peer Review

Current Reviewer Status: ?
Key to Reviewer Statuses VIEW
ApprovedThe paper is scientifically sound in its current form and only minor, if any, improvements are suggested
Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit.
Not approvedFundamental flaws in the paper seriously undermine the findings and conclusions
Version 3
VERSION 3
PUBLISHED 06 Jun 2019
Revised
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Reviewer Report 10 Jun 2019
Riccardo Asero, Ambulatorio di Allergologia, Clinica San Carlo, Paderno Dugnano (Milan), Italy 
Approved
VIEWS 4
The authors have ... Continue reading
CITE
CITE
HOW TO CITE THIS REPORT
Asero R. Reviewer Report For: Case Report: Resolution of chronic urticaria following treatment of odontogenic infection [version 3; peer review: 3 approved]. F1000Research 2019, 7:1738 (https://doi.org/10.5256/f1000research.21444.r49625)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
Version 2
VERSION 2
PUBLISHED 14 May 2019
Revised
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8
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Reviewer Report 31 May 2019
Riccardo Asero, Ambulatorio di Allergologia, Clinica San Carlo, Paderno Dugnano (Milan), Italy 
Approved with Reservations
VIEWS 8
Tadros and co-workers report a case of severe chronic urticaria unresponsive to second generation antihistamines given at higher than licensed doses that resolved following the treatment of dental infection.

General comments
The clinical case is nicely ... Continue reading
CITE
CITE
HOW TO CITE THIS REPORT
Asero R. Reviewer Report For: Case Report: Resolution of chronic urticaria following treatment of odontogenic infection [version 3; peer review: 3 approved]. F1000Research 2019, 7:1738 (https://doi.org/10.5256/f1000research.21100.r49180)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
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5
Cite
Reviewer Report 31 May 2019
Patrick Yong, Department of Allergy and Clinical Immunology, Royal Surrey County Hospital, Guildford, UK 
Approved
VIEWS 5
This report presents a case of CSU which improved following treatment of dental infection. This is a recognised association with CSU, and serves as a useful reminder to clinicians treating patients with CSU.

The case report and ... Continue reading
CITE
CITE
HOW TO CITE THIS REPORT
Yong P. Reviewer Report For: Case Report: Resolution of chronic urticaria following treatment of odontogenic infection [version 3; peer review: 3 approved]. F1000Research 2019, 7:1738 (https://doi.org/10.5256/f1000research.21100.r40188)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
Views
10
Cite
Reviewer Report 15 May 2019
Sinisa Savic, Section of Musculoskeletal Disease, Leeds Institute of Molecular Medicine, NIHR Leeds Musculoskeletal Biomedical Research Unit, Chapel Allerton Hospital, University of Leeds, Leeds, UK 
Approved
VIEWS 10
The authors have adequately ... Continue reading
CITE
CITE
HOW TO CITE THIS REPORT
Savic S. Reviewer Report For: Case Report: Resolution of chronic urticaria following treatment of odontogenic infection [version 3; peer review: 3 approved]. F1000Research 2019, 7:1738 (https://doi.org/10.5256/f1000research.21100.r48539)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
Version 1
VERSION 1
PUBLISHED 02 Nov 2018
Views
16
Cite
Reviewer Report 01 Apr 2019
Sinisa Savic, Section of Musculoskeletal Disease, Leeds Institute of Molecular Medicine, NIHR Leeds Musculoskeletal Biomedical Research Unit, Chapel Allerton Hospital, University of Leeds, Leeds, UK 
Approved with Reservations
VIEWS 16
This case report describes a patient who developed CSU refractory to 1st and 2nd line therapies. His CSU resolved promptly after treatment of the concurrent dental infection. 
 
This case illustrates importance of searching for underlying causes of CSU as ... Continue reading
CITE
CITE
HOW TO CITE THIS REPORT
Savic S. Reviewer Report For: Case Report: Resolution of chronic urticaria following treatment of odontogenic infection [version 3; peer review: 3 approved]. F1000Research 2019, 7:1738 (https://doi.org/10.5256/f1000research.18406.r45040)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.

Comments on this article Comments (0)

Version 3
VERSION 3 PUBLISHED 02 Nov 2018
Comment
Alongside their report, reviewers assign a status to the article:
Approved - the paper is scientifically sound in its current form and only minor, if any, improvements are suggested
Approved with reservations - A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit.
Not approved - fundamental flaws in the paper seriously undermine the findings and conclusions
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