Summary
Accumulating evidence indicates that body weight, alcohol and smoking are associated with psoriasis. However, these factors have scarcely been investigated in relation to onset and disease activity at onset of psoriasis.

A population-based case-control study was performed including 373 cases with onset of first-time plaque psoriasis within 12 months and matched healthy controls. Psoriasis activity was measured using the Psoriasis Area and Severity Index (PASI). Analyses were performed using conditional logistic regression. In multivariable analyses for each unit increment in body mass index, there was statistically significant 9% increased risk for psoriasis onset and 7% higher risk for increased PASI. Obesity (body mass index ≥ 30) compared with normal body weight was associated with a two-fold increased risk for psoriasis onset. Smoking was associated with a 70% increased risk for onset, but was not related to PASI. A positive association with alcohol drinking was observed among men, but not among women.

No associations were observed for weight gain and use of smokeless tobacco. Our results indicate that excessive body weight and smoking are risk factors for onset of psoriasis and that higher body mass index increases the PASI of plaque psoriasis at onset.

PubMed

Indian J Dermatol Venereol Leprol. 2009 Sep-Oct; 75(5): 551Bilac C, Ermertcan AT, Bilac DB, Deveci A
Department of Dermatology, Celal Bayar University, Faculty of Medicine, Manisa, Turkey

Pruritus (itch) is a common symptom of many dermatological and systemic diseases. It is a common complaint among patients with psoriasis of the chronic plaque type.

Patients with pruritus (itch) suffer from more severe psoriasis although some authors did not find a significant relationship between pruritus intensity and psoriasis severity. AIMS: In this study, we aimed to investigate the relationship between clinical features and symptoms among psoriasis patients. And also we aimed to evaluate whether the severity of disease, depression and quality of life scores could effect these symptoms or not.

Methods
Eighty seven patients with psoriasis were enrolled in this study. Epidemiological data of patients were noted. Clinical symptoms, such as pruritus, pain, burning, exudation, bleeding, weakness, etc. were interrogated. The answers to these questions were classified as ‘never’, ‘rare’, ‘sometimes’, ‘often’ and ‘all the time’. Psoriasis Area and Severity Index (PASI), Dermatology Life Quality Index (DLQI), Hamilton Anxiety-Depression Scale (HAD) were calculated for each patient. PASI and DLQI scores were classified as > or = and < 10.

Results
We found that the most frequent symptom was pruritus (96.6%). Other frequent symptoms were burning (56.3%), exudation (56.3%) and bleeding (49.4%). Hurting, sensitiveness and bothering were more frequent in women. Percentages of hurting, pain, exudation and weakness symptoms had been increasing with age. Frequency of weakness was significantly high in PASI > or = 10 patients.

Conclusion
Pruritus is a very common symptom in psoriasis. Burning, exudation and bleeding are also common symptoms seen in psoriasis. New scoring systems including symptoms of psoriasis patients may be developed for evaluating the severity of the disease.

As a result of this study, we suggest that dermatologists should be alert to the presence, frequency and relevance of symptoms experienced by their patients with psoriasis on the evaluation of disease severity both in clinical practice and in clinical trials. It is also important to interrogate these associated symptoms before deciding therapeutic approaches and evaluating their efficacies.

Original article

Denise Globe1 , Martha S Bayliss2  and David J Harrison1
1Amgen Inc, One Amgen Center Drive, Thousand Oaks, CA, 91320 USA
2Mapi Values, 3rd Floor 133 Portland Street, Boston, MA 02114, USA

Background
The objective of this qualitative study was to better understand the impact of psoriasis symptoms using a 3-part process: 1) develop a disease model for psoriasis to identify the most important concepts relevant to psoriasis patients; 2) conduct interviews with dermatologists to identify key areas of clinical concern; and 3) explore psoriasis patients’ perceptions of the impact of psoriasis.

Methods
A disease model was developed from a review of the published literature and later revised based on the findings of clinician interviews and patient focus groups. To confirm the clinical relevance of the concepts identified in the disease model, 5 dermatologists were selected and interviewed one-on-one. They were asked to rate major psoriasis symptoms according to importance and bothersomeness level to patients on separate scales of 1 to 10. Results of clinician interviews were used to develop interview guides for patient focus groups. To identify important domains of psoriasis, 39 patients participated in 5 separate concept elicitation focus groups. Four focus groups included patients with severe psoriasis (n = 31) and one included patients with mild psoriasis (n = 8). Patients were asked to describe their current psoriasis symptoms and to rate them on a scale of 1 to 10, according to importance, severity, and troublesomeness. An average mean rating was calculated for each symptom throughout all focus groups.

Results
Clinicians most frequently mentioned itch (n = 5), psoriatic arthritis or “joint pains” (n = 4), flaking (n = 4), and pain (n = 3) as primary physical symptoms of psoriasis. Three clinicians gave a rating of 10 for the importance of itch; two clinicians gave ratings of 8 and 7 for importance. The majority of patients rated itch as the most important (31/39), most severe (31/39), and most troublesome (24/39) symptom and noted that itch negatively impacted daily activities (eg, concentration, sleep, ability to attend work or school), as well as emotions (eg, anxiety and embarrassment).

Conclusion
These analyses suggest that itch is one of the most important symptoms of psoriasis, contributing to diminished health-related quality of life (HRQoL) in patients with both mild and severe disease.

Original article