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Chronic pruritus is a frequent symptom, which also presents in fields other than dermatology. A number of internal diseases can be accompanied by severe chronic pruritus (CP). A new classification for CP was developed in 2007, suggesting three categories according to the clinical presentation of CP and six categories according its aetiology (1). Prurigo nodularis (PN) is a chronic inflammatory skin alteration that is usually caused by severe CP, with secondary development of excoriated and ulcerated papules and nodules being the result of frequent scratching (2). According to the clinical classification described above, PN corresponds to group III (Pruritus with chronic secondary scratch lesions) and, due to its aetiology, PN can be caused by dermatological, systemic, neurological or psychosomatic/somatoform diseases, or may have mixed causes (1). [ABSTRACT FROM AUTHOR]

Pruritus is a frequent symptom in medicine. Population-based studies show that every 5th person in the general population has suffered from chronic pruritus at least once in the lifetime with a 12-month incidence of 7%. In patient populations its frequency is much higher depending on the underlying cause, ranging from around 25% in haemodialysis patients to 100% in skin diseases such as urticaria and atopic dermatitis (AD). Pruritus may be the result of a dermatological or non-dermatological disease. Especially in non-diseased skin it may be caused by systemic, neurological or psychiatric diseases, as well as being a side effect of medications. In a number of cases chronic pruritus may be of multifactorial origin. Pruritus needs a precise diagnostic work-up. Management of chronic pruritus comprises treatment of the underlying disease and topical treatment modalities, including symptomatic antipruritic treatment, ultraviolet phototherapy and systemic treatment. Treating chronic pruritus needs to be targeted, multimodal and performed in a step-wise procedure requiring an interdisciplinary approach. We present the updated and consensus based (S2k) European guideline on chronic pruritus by a team of European pruritus experts from different disciplines. This version is an updated version of the guideline that was published in 2012 and updated in 2014 (www.euroderm. org). [ABSTRACT FROM AUTHOR]

The central processing of itch is not completely understood. This is the first study to use functional magnetic resonance imaging (fMRI) to examine the central modulation by distraction of experimentally induced itch. A total of 33 healthy volunteers were examined with fMRI. Periods of itch induction without distraction and itch with distraction by a Stroop task (psychological test, where the participants have to decide if the colour of the writing corresponds to the written word, for example if "red" is written in red or not) were counterbalanced during the scanning to examine task-specific changes in blood oxygenation level dependent-signal. The intensity of the subjects' itch sensation, desire to scratch and pain sensation were evaluated. Distraction by a Stroop task did not reduce itch intensity or urge to scratch. However, the Stroop task led to significantly higher activation of the left brainstem when it followed the "pure" itch sensation. Itch and pain seem to have similar inhibition pathways, particularly concerning brainstem activation during distraction. But as itch sensation, in contrast to pain, could not be sufficiently reduced by distraction, both entities might have different modulation systems. [ABSTRACT FROM AUTHOR]

In brachioradial pruritus and notalgia paraesthetica, the 8% capsaicin patch is a novel and effective, but cost-intense, therapy. Routine data for 44 patients were collected 6 months retrospectively and prospectively to first patch application. The cost to health insurance and the patient, and patient-reported outcomes were analysed (visual analogue scale, numerical rating scale, verbal rating scale for pruritus symptoms, Dermatological Life Quality Index, and Patient Benefit Index). Mean inpatient treatment costs were reduced by €212.31, and mean outpatient treatment and medication costs by €100.74 per patient (p.p.). However, these reductions did not offset the high cost of the patch itself (€767.02 p.p.); thus the total cost to health insurance increased by €453.97 p.p. (p ≤ 0.01). The additional costs of therapy to the patient decreased by €441.06, thus the overall cost p.p. remained approximately the same (€3,306.03 vs. €3,318.94). Capsaicin patch therapy resulted in reduced pruritus, improved quality of life and greater patient benefit, thus long-term cost-efficiency analyses are necessary. [ABSTRACT FROM AUTHOR]

Pruritus is a frequent sensation in dermatoses, but its prevalence in patients in dermatological practices has not been fully studied. The aim of this cross-sectional study is to investigate its prevalence and characteristics in all patients attending a dermatology practice in Germany over a period of one week (n = 334; 52.7% female; median age 45.0 years). The point prevalence of pruritus in this study population was 36.2% (87.6% of whom had chronic pruritus). It inhibited the everyday life of 73.6% of all patients, with 77.7% reporting a frequently to permanently experienced moderate intensity. (5.2 ± 2.3 on the numerical rating scale). Of the patients, 52.1% had previously consulted their general practitioner, and 62% had visited the dermatologist due to pruritus. This study shows that pruritus is a highly prevalent, clinically and economically relevant symptom in dermatological practices. The majority of patients suffering from chronic pruritus are severely burdened and medically underserved. Dermatologists should be aware that pruritus also occurs frequently in patients who do not primarily present due to their symptoms. [ABSTRACT FROM AUTHOR]

The article presents the guidelines for the treatment of chronic pruritus issued by the European Dermatology Forum (EDF) and the European Academy of Dermatology and Venerology (EADV). It discusses several factors related with chronic pruritus which include clinical classification, epidemiological study and diagnostic management. It also informs about the diagnosis and treatment methods for chronic pruritus.

The aim of this study was to evaluate the visual analogue scale (VAS) as a method of pruritus assessment. A total of 310 subjects with pruritic dermatoses (148 Caucasian subjects and 162 Asian subjects) were recruited. The patients assessed pruritus intensity using the horizontal and vertical VAS, numeric rating scale (NRS) and verbal rating scale (VRS). All scales showed very good reproducibility (intraclass coefficient (ICC) >0.8). No significant differences were found between the horizontal and vertical VAS (5.3±2.9 vs. 5.3±3.0 points,p=0.34). Using NRS, patients rated their pruritus significantly higher than with VAS (5.7 ±2.6 points, p< 0.01). VRS showed the highest correlation with NRS (R=0.82,/><0.001), fol-lowed by horizontal (R= 0.75,p< 0.001) and vertical VAS (R=0.74,p <0.001). Based on detailed analysis following VAS categories were proposed: 0 = no pruritus, >0-<4 points = mild pruritus, ≥ 4-< 7 points=moderate pruritus, ≥ 7-< 9 points = severe pruritus, and ≥ 9 points=very severe pruritus. In conclusion, the VAS is a valuable method of pruritus measurement. [ABSTRACT FROM AUTHOR]

Chronic pruritus, which is associated with a wide variety of underlying diseases, represents a challenge in diagnostics and treatment in dermatology and general medicine. The cause of pruritus remains unknown in up to 45% of patients. In this study, 718 patients with chronic pruritus were analysed concerning lactase deficiency, demographic data, aetiology, duration and intensity of pruritus. A total of 154 patients were tested positive for lactase deficiency and 38.3% showed a significant anti-pruritic response to a lactose-free diet (minimum 4 weeks). The best results were observed in patients with pruritus of mixed or unknown origin (n = 91; 64% response). Age, sex, localization or duration had no significant influence on the anti-pruritic effect of a lactose-free diet. Lactase deficiency might be an independent causal factor in the elicitation of chronic pruritus. Thus, screening for lactase deficiency represents a rational step in the diagnostic work-up of chronic pruritus. In case of a positive test result, a lactose-free diet offers a low-cost, efficient and specific therapy in patients with chronic pruritus. [ABSTRACT FROM AUTHOR]