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This evidence- and consensus-based guideline was developed following the methods recommended by Cochrane and the Grading of Recommendations Assessment, Development and Evaluation (GRADE) working group. The conference was held on 1 December 2016. It is a joint initiative of the Dermatology Section of the European Academy of Allergology and Clinical Immunology (EAACI), the EU-founded network of excellence, the Global Allergy and Asthma European Network (GA²LEN), the European Dermatology Forum (EDF) and the World Allergy Organization (WAO) with the participation of 48 delegates of 42 national and international societies. This guideline was acknowledged and accepted by the European Union of Medical Specialists (UEMS). Urticaria is a frequent, mast cell-driven disease, presenting with wheals, angioedema, or both. The lifetime prevalence for acute urticaria is approximately 20%. Chronic spontaneous urticaria and other chronic forms of urticaria are disabling, impair quality of life and affect performance at work and school. This guideline covers the definition and classification of urticaria, taking into account the recent progress in identifying its causes, eliciting factors and pathomechanisms. In addition, it outlines evidence-based diagnostic and therapeutic approaches for the different subtypes of urticaria.

This update and revision of the international guideline for urticaria was developed following the methods recommended by Cochrane and the Grading of Recommendations Assessment, Development and Evaluation (GRADE) working group. It is a joint initiative of the Dermatology Section of the European Academy of Allergology and Clinical Immunology (EAACI), the Global Allergy and Asthma European Network (GA²LEN) and its Urticaria and Angioedema Centers of Reference and Excellence (UCAREs and ACAREs), the European Dermatology Forum (EDF; EuroGuiDerm), and the Asia Pacific Association of Allergy, Asthma and Clinical Immunology with the participation of 64 delegates of 50 national and international societies and from 31 countries. The consensus conference was held on 3 December 2020. This guideline was acknowledged and accepted by the European Union of Medical Specialists (UEMS). Urticaria is a frequent, mast cell-driven disease that presents with wheals, angioedema, or both. The lifetime prevalence for acute urticaria is approximately 20%. Chronic spontaneous or inducible urticaria is disabling, impairs quality of life, and affects performance at work and school. This updated version of the international guideline for urticaria covers the definition and classification of urticaria and outlines expert-guided and evidence-based diagnostic and therapeutic approaches for the different subtypes of urticaria.

Background: European legislation has banned the preservative methylisothiazolinone (MI) from inclusion in leave-on cosmetics. However, the risk for allergic reactions depends on exposure. The aim of this study was to determine the risk of MI in laundry detergents for household machine washing. Methods: Different formulations of laundry detergents with commercial MI levels, up to one thousand ppm were used and three different types of clothes were washed in a normal household machine setting one time and 10 times. The level of MI was measured by HPLC. Results: While MI could be retrieved in the positive control of clothes drenched with washing powder but not washed afterwards, MI could not be detected in any specimen of clothes washed under household conditions. The detection limit was 0.5 ppm. Conclusion: It is important to discuss the difference of risk and hazard. While MI clearly is a high hazard as a strong contact allergen, the risk depends on exposure. Regarding the risk of exposure levels for the consumer to MI in clothes it can be stated that the use of MI in laundry detergents is safe for the consumer if these products are used according to the instructions in the normal household setting machine wash.

International audience ; Background: Chronic urticaria (CU) is a common disease, characterized by the recurrent appearance of wheals, angioedema or both for more than 6 weeks. Its underlying biology is not well understood, and many patients do not obtain sufficient relief from recommended treatments. Patient registries are rapidly growing as a form of research, because they can provide powerful, data-driven insights about the epidemiology of diseases, real-world effectiveness of treatments, rare patient types, safety monitoring, healthcare costs and opportunities for quality improvement of healthcare delivery.Objectives: The Chronic Urticaria Registry (CURE) has been designed to improve the scientific understanding, clinical treatment and healthcare planning of CU patients. This report describes the rationale, methods and initial implementation of this registry.Methods: Chronic Urticaria Registry is an ongoing, prospective, international, multicentre, observational, voluntary registry of patients with CU. Participation in CURE is open to any physician treating CU patients, regardless of location, medical specialty or type of practice setting. CURE aims to collect data on all CU patients, with no intentional selection or exclusion criteria. It collects baseline and follow-up data on the patient's demographics, history, symptoms, trigger and risk factors, therapies and healthcare utilization.Results: Chronic Urticaria Registry is a landmark achievement of the global urticaria medical community. As of 26 February 2020, 39 centres around the world have joined the registry and 35 have entered baseline data on a total of 2946 patients. Publications of this data will be forthcoming soon.Conclusions: Chronic Urticaria Registry is eagerly seeking the participation of more physicians and the support of more governmental, charitable and commercial sponsors from around the world. Here, in this paper, we invite other physicians to join this unique project to improve the lives of patients with CU.

International audience ; Background: Chronic urticaria (CU) is a common disease, characterized by the recurrent appearance of wheals, angioedema or both for more than 6 weeks. Its underlying biology is not well understood, and many patients do not obtain sufficient relief from recommended treatments. Patient registries are rapidly growing as a form of research, because they can provide powerful, data-driven insights about the epidemiology of diseases, real-world effectiveness of treatments, rare patient types, safety monitoring, healthcare costs and opportunities for quality improvement of healthcare delivery.Objectives: The Chronic Urticaria Registry (CURE) has been designed to improve the scientific understanding, clinical treatment and healthcare planning of CU patients. This report describes the rationale, methods and initial implementation of this registry.Methods: Chronic Urticaria Registry is an ongoing, prospective, international, multicentre, observational, voluntary registry of patients with CU. Participation in CURE is open to any physician treating CU patients, regardless of location, medical specialty or type of practice setting. CURE aims to collect data on all CU patients, with no intentional selection or exclusion criteria. It collects baseline and follow-up data on the patient's demographics, history, symptoms, trigger and risk factors, therapies and healthcare utilization.Results: Chronic Urticaria Registry is a landmark achievement of the global urticaria medical community. As of 26 February 2020, 39 centres around the world have joined the registry and 35 have entered baseline data on a total of 2946 patients. Publications of this data will be forthcoming soon.Conclusions: Chronic Urticaria Registry is eagerly seeking the participation of more physicians and the support of more governmental, charitable and commercial sponsors from around the world. Here, in this paper, we invite other physicians to join this unique project to improve the lives of patients with CU.

International audience ; Background: Chronic urticaria (CU) is a common disease, characterized by the recurrent appearance of wheals, angioedema or both for more than 6 weeks. Its underlying biology is not well understood, and many patients do not obtain sufficient relief from recommended treatments. Patient registries are rapidly growing as a form of research, because they can provide powerful, data-driven insights about the epidemiology of diseases, real-world effectiveness of treatments, rare patient types, safety monitoring, healthcare costs and opportunities for quality improvement of healthcare delivery.Objectives: The Chronic Urticaria Registry (CURE) has been designed to improve the scientific understanding, clinical treatment and healthcare planning of CU patients. This report describes the rationale, methods and initial implementation of this registry.Methods: Chronic Urticaria Registry is an ongoing, prospective, international, multicentre, observational, voluntary registry of patients with CU. Participation in CURE is open to any physician treating CU patients, regardless of location, medical specialty or type of practice setting. CURE aims to collect data on all CU patients, with no intentional selection or exclusion criteria. It collects baseline and follow-up data on the patient's demographics, history, symptoms, trigger and risk factors, therapies and healthcare utilization.Results: Chronic Urticaria Registry is a landmark achievement of the global urticaria medical community. As of 26 February 2020, 39 centres around the world have joined the registry and 35 have entered baseline data on a total of 2946 patients. Publications of this data will be forthcoming soon.Conclusions: Chronic Urticaria Registry is eagerly seeking the participation of more physicians and the support of more governmental, charitable and commercial sponsors from around the world. Here, in this paper, we invite other physicians to join this unique project to improve the lives of patients with CU.

International audience ; Background: Chronic urticaria (CU) is a common disease, characterized by the recurrent appearance of wheals, angioedema or both for more than 6 weeks. Its underlying biology is not well understood, and many patients do not obtain sufficient relief from recommended treatments. Patient registries are rapidly growing as a form of research, because they can provide powerful, data-driven insights about the epidemiology of diseases, real-world effectiveness of treatments, rare patient types, safety monitoring, healthcare costs and opportunities for quality improvement of healthcare delivery.Objectives: The Chronic Urticaria Registry (CURE) has been designed to improve the scientific understanding, clinical treatment and healthcare planning of CU patients. This report describes the rationale, methods and initial implementation of this registry.Methods: Chronic Urticaria Registry is an ongoing, prospective, international, multicentre, observational, voluntary registry of patients with CU. Participation in CURE is open to any physician treating CU patients, regardless of location, medical specialty or type of practice setting. CURE aims to collect data on all CU patients, with no intentional selection or exclusion criteria. It collects baseline and follow-up data on the patient's demographics, history, symptoms, trigger and risk factors, therapies and healthcare utilization.Results: Chronic Urticaria Registry is a landmark achievement of the global urticaria medical community. As of 26 February 2020, 39 centres around the world have joined the registry and 35 have entered baseline data on a total of 2946 patients. Publications of this data will be forthcoming soon.Conclusions: Chronic Urticaria Registry is eagerly seeking the participation of more physicians and the support of more governmental, charitable and commercial sponsors from around the world. Here, in this paper, we invite other physicians to join this unique project to improve the lives of patients with CU.

Altres ajuts: Funding - The study was supported by the European Centre for Allergy Research Foundation. ; European legislation has banned the preservative methylisothiazolinone (MI) from inclusion in leave-on cosmetics. However, the risk for allergic reactions depends on exposure. The aim of this study was to determine the risk of MI in laundry detergents for household machine washing. Different formulations of laundry detergents with commercial MI levels, up to one thousand ppm were used and three different types of clothes were washed in a normal household machine setting one time and 10 times. The level of MI was measured by HPLC. While MI could be retrieved in the positive control of clothes drenched with washing powder but not washed afterwards, MI could not be detected in any specimen of clothes washed under household conditions. The detection limit was 0.5 ppm. It is important to discuss the difference of risk and hazard. While MI clearly is a high hazard as a strong contact allergen, the risk depends on exposure. Regarding the risk of exposure levels for the consumer to MI in clothes it can be stated that the use of MI in laundry detergents is safe for the consumer if these products are used according to the instructions in the normal household setting machine wash.

Background: Chronic urticaria (CU) is a common disease, characterized by the recurrent appearance of wheals, angioedema or both for more than 6 weeks. Its underlying biology is not well understood, and many patients do not obtain sufficient relief from recommended treatments. Patient registries are rapidly growing as a form of research, because they can provide powerful, data-driven insights about the epidemiology of diseases, real-world effectiveness of treatments, rare patient types, safety monitoring, healthcare costs and opportunities for quality improvement of healthcare delivery. Objectives: The Chronic Urticaria Registry (CURE) has been designed to improve the scientific understanding, clinical treatment and healthcare planning of CU patients. This report describes the rationale, methods and initial implementation of this registry. Methods: Chronic Urticaria Registry is an ongoing, prospective, international, multicentre, observational, voluntary registry of patients with CU. Participation in CURE is open to any physician treating CU patients, regardless of location, medical specialty or type of practice setting. CURE aims to collect data on all CU patients, with no intentional selection or exclusion criteria. It collects baseline and follow-up data on the patient's demographics, history, symptoms, trigger and risk factors, therapies and healthcare utilization. Results: Chronic Urticaria Registry is a landmark achievement of the global urticaria medical community. As of 26 February 2020, 39 centres around the world have joined the registry and 35 have entered baseline data on a total of 2946 patients. Publications of this data will be forthcoming soon. Conclusions: Chronic Urticaria Registry is eagerly seeking the participation of more physicians and the support of more governmental, charitable and commercial sponsors from around the world. Here, in this paper, we invite other physicians to join this unique project to improve the lives of patients with CU.

Background: Chronic urticaria (CU) is a common disease, characterized by the recurrent appearance of wheals, angioedema or both for more than 6 weeks. Its underlying biology is not well understood, and many patients do not obtain sufficient relief from recommended treatments. Patient registries are rapidly growing as a form of research, because they can provide powerful, data-driven insights about the epidemiology of diseases, real-world effectiveness of treatments, rare patient types, safety monitoring, healthcare costs and opportunities for quality improvement of healthcare delivery. Objectives: The Chronic Urticaria Registry (CURE) has been designed to improve the scientific understanding, clinical treatment and healthcare planning of CU patients. This report describes the rationale, methods and initial implementation of this registry. Methods: Chronic Urticaria Registry is an ongoing, prospective, international, multicentre, observational, voluntary registry of patients with CU. Participation in CURE is open to any physician treating CU patients, regardless of location, medical specialty or type of practice setting. CURE aims to collect data on all CU patients, with no intentional selection or exclusion criteria. It collects baseline and follow-up data on the patient's demographics, history, symptoms, trigger and risk factors, therapies and healthcare utilization. Results: Chronic Urticaria Registry is a landmark achievement of the global urticaria medical community. As of 26 February 2020, 39 centres around the world have joined the registry and 35 have entered baseline data on a total of 2946 patients. Publications of this data will be forthcoming soon. Conclusions: Chronic Urticaria Registry is eagerly seeking the participation of more physicians and the support of more governmental, charitable and commercial sponsors from around the world. Here, in this paper, we invite other physicians to join this unique project to improve the lives of patients with CU.

BACKGROUND: In recent years, skin reactions secondary to the use of medical devices (MD), such as allergic contact dermatitis have increasingly been observed (e.g. to continuous blood sugar monitoring systems, insulin pumps, wound dressings, medical gloves, etc.): this is regarded as a developing epidemic. Lack of labelling of the composition of MD, as well as frequent lack of cooperation of manufacturers to disclose this relevant information, even when contacted by the clinician for the individual case of an established adverse reaction, significantly impede patient care. OBJECTIVES: To advocate for full ingredient labelling in the implementation of EU regulation for MD. METHODS: This position paper reviews the scientific literature, the current regulatory framework adopted for MD to date, and the likely impact, including some costs data in case of the absence of such labelling. RESULTS: Efforts made by several scientific teams, who are trying to identify the culprit of such adverse effects, either via asking for cooperation from companies, or using costly chemical analyses of MD, can only partly, and with considerable delay, compensate for the absence of meaningful information on the composition of MD; hence, patient management is compromised. Indeed, without knowing the chemical substances present, physicians are unable to inform patients about which substances they should avoid, and which alternative MD may be suitable/tolerated. CONCLUSION: There is an urgent need for full and accurate labelling of the chemical composition of MD in contact with the human body.

In recent years, skin reactions secondary to the use of medical devices (MD), such as allergic contact dermatitis have increasingly been observed (e.g. to continuous blood sugar monitoring systems, insulin pumps, wound dressings, medical gloves, etc.): this is regarded as a developing epidemic. Lack of labelling of the composition of MD, as well as frequent lack of cooperation of manufacturers to disclose this relevant information, even when contacted by the clinician for the individual case of an established adverse reaction, significantly impede patient care. To advocate for full ingredient labelling in the implementation of EU regulation for MD. This position paper reviews the scientific literature, the current regulatory framework adopted for MD to date, and the likely impact, including some costs data in case of the absence of such labelling. Efforts made by several scientific teams, who are trying to identify the culprit of such adverse effects, either via asking for cooperation from companies, or using costly chemical analyses of MD, can only partly, and with considerable delay, compensate for the absence of meaningful information on the composition of MD; hence, patient management is compromised. Indeed, without knowing the chemical substances present, physicians are unable to inform patients about which substances they should avoid, and which alternative MD may be suitable/tolerated. There is an urgent need for full and accurate labelling of the chemical composition of MD in contact with the human body.

Background: In recent years, skin reactions secondary to the use of medical devices (MD), such as allergic contact dermatitis have increasingly been observed (e.g. to continuous blood sugar monitoring systems, insulin pumps, wound dressings, medical gloves, etc.): this is regarded as a developing epidemic. Lack of labelling of the composition of MD, as well as frequent lack of cooperation of manufacturers to disclose this relevant information, even when contacted by the clinician for the individual case of an established adverse reaction, significantly impede patient care. Objectives: To advocate for full ingredient labelling in the implementation of EU regulation for MD. Methods: This position paper reviews the scientific literature, the current regulatory framework adopted for MD to date, and the likely impact, including some costs data in case of the absence of such labelling. Results: Efforts made by several scientific teams, who are trying to identify the culprit of such adverse effects, either via asking for cooperation from companies, or using costly chemical analyses of MD, can only partly, and with considerable delay, compensate for the absence of meaningful information on the composition of MD; hence, patient management is compromised. Indeed, without knowing the chemical substances present, physicians are unable to inform patients about which substances they should avoid, and which alternative MD may be suitable/tolerated. Conclusion: There is an urgent need for full and accurate labelling of the chemical composition of MD in contact with the human body.

Background: In recent years, skin reactions secondary to the use of medical devices (MD), such as allergic contact dermatitis have increasingly been observed (e.g. to continuous blood sugar monitoring systems, insulin pumps, wound dressings, medical gloves, etc.): this is regarded as a developing epidemic. Lack of labelling of the composition of MD, as well as frequent lack of cooperation of manufacturers to disclose this relevant information, even when contacted by the clinician for the individual case of an established adverse reaction, significantly impede patient care. Objectives: To advocate for full ingredient labelling in the implementation of EU regulation for MD. Methods: This position paper reviews the scientific literature, the current regulatory framework adopted for MD to date, and the likely impact, including some costs data in case of the absence of such labelling. Results: Efforts made by several scientific teams, who are trying to identify the culprit of such adverse effects, either via asking for cooperation from companies, or using costly chemical analyses of MD, can only partly, and with considerable delay, compensate for the absence of meaningful information on the composition of MD; hence, patient management is compromised. Indeed, without knowing the chemical substances present, physicians are unable to inform patients about which substances they should avoid, and which alternative MD may be suitable/tolerated. Conclusion: There is an urgent need for full and accurate labelling of the chemical composition of MD in contact with the human body.