Atopic dermatitis phenotypes based on cluster analysis of the Danish Skin Cohort.

BACKGROUND: Despite previous attempts to classify atopic dermatitis (AD) into subtypes (e.g. extrinsic vs. intrinsic), there is a need to better understand specific phenotypes in adulthood. OBJECTIVES: To identify, using machine learning (ML), adult AD phenotypes. METHODS: We used unsupervised cluster analysis to identify AD phenotypes by analysing different responses to predetermined variables (age of disease onset, severity, itch and skin pain intensity, flare frequency, anatomical location, presence and/or severity of current comorbidities) in adults with AD from the Danish Skin Cohort. RESULTS: The unsupervised cluster analysis resulted in five clusters where AD severity most clearly differed. We classified them as 'mild', 'mild-to-moderate', 'moderate', 'severe' and 'very severe'. The severity of multiple predetermined patient-reported outcomes was positively associated with AD, including an increased number of flare-ups and increased flare-up duration and disease severity. However, an increased severity of rhinitis and mental health burden was also found for the mild-to-moderate phenotype. CONCLUSIONS: ML confirmed the use of disease severity for the categorization of phenotypes, and our cluster analysis provided novel detailed information about how flare patterns and duration are associated with AD disease severity.

Mild-to-moderate severity of psoriasis may be assessed remotely based on photographs and self-reported extent of skin involvement.

Background: Remote monitoring was used to assess and manage skin diseases. Objective: To investigate to what extent smartphone photographs along with a self-reported body region (BR) score can be used to evaluate psoriasis severity. Methods: Psoriasis severity was assessed in the clinic using the psoriasis area and severity index and the physician's global assessment. On the same day, the patients took a photograph of a representative lesion from 4 BR (head/neck, upper limbs, trunk, and lower limbs) and completed a questionnaire about BR score. The photographs were rated by 5 dermatologists. Intraclass correlation coefficients with 95% CIs were calculated. Results: Overall, 32 were included, of which 6% had almost clear, 69% had mild, and 25% had moderate psoriasis. Perfect agreement between the self-reported and the doctors' BR score was observed for 59%, and near-perfect agreement (deviation of maximum 1 score) was 92%. The intraclass correlation coefficient between clinical and photographic psoriasis area and severity index was 0.78 (95% CI, 0.55-0.90), and for physician's global assessment, perfect agreement was 53%. Conclusions: The agreement between psoriasis severity assessed clinically and by photographs was good in a study setting. This gives the opportunity to remotely assess psoriasis severity by combining photographs with self-reported BR scores.

Adrenaline autoinjector is under-prescribed in typical cold urticaria patients living in tropical climate countries.

Background: The diagnosis of typical cold urticaria (ColdU) relies on whealing in response to local cold stimulation testing (CST). It can also manifest with cold-induced anaphylaxis (ColdA). Till date, it is largely unclear how often patients with ColdU receive adrenaline treatment and are provided with an adrenaline autoinjector (AAI). Methods: An international, cross-sectional study, COLD-CE (i.e., comprehensive evaluation of ColdU and other cold-induced reactions), was carried out at 32 UCAREs. Detailed histories were taken and CST with an ice cube and/or TempTest® performed. ColdA was defined as an acute cold-induced (i.e., by cold water, air, or surfaces) involvement of the skin and/or visible mucosal tissue and at least one of the symptoms (cardiovascular manifestations, difficulty breathing, or gastrointestinal symptoms). Results: Of the 551 ColdU patients, 75% (n = 412) had a positive CST. Of them, concomitant chronic spontaneous urticaria was diagnosed in 10%. Of 372 patients with stand-alone ColdU, 69% were women and 91% adults. Their median age was 36 (IQR 26 - 48) years. Patients were also categorized into residents of countries with a tropical (n = 33), temperate (n = 264), or cold (n = 75) climate (Table 1: R13C1, R17C1, R21C1). AAI was more often prescribed to residents of temperate than tropical countries (30% vs. 12%, p = .038; Table 1: R31C1), although the frequency of ColdA did not significantly differ between these countries (44% vs. 42%, p = 1.000; R29C2). Residents of tropical countries had a higher frequency of ColdA induced by cold air than residents of temperate (36% vs. 12%, p = .001; R29C4) or cold (36% vs. 12%, p = .007; R25C4) countries. Cardiovascular manifestations induced by cold air were diagnosed in 33% (n = 11) of residents of tropical countries, but only 18% (n = 2) and 36% (n = 4) of them had received adrenaline and AAI, respectively (R13 - 15C7). Furthermore, hypotension and/or loss of consciousness induced by cold air occurred in 18% (n = 6) of patients, but only 17% (n = 1) received adrenaline (R13 - 14C10). ColdA was induced by complete cold water immersion in 9% (n = 3) of patients, and none of them received adrenaline treatment nor AAI (R13 - 15C3). Conclusion: Our findings suggest that ColdA is undertreated and call for changes in ColdU management.

Comorbidities, socioeconomic status, drug use, and health care consumption in Danish women with psoriasis: A nationwide cross-sectional study.

BACKGROUND: Psoriasis is a disease that extends beyond the skin, with profound medical, social, and mental health implications. To our knowledge, no previous studies have specifically investigated the medical and socioeconomic characteristics of women with versus without psoriasis. OBJECTIVE: We investigated whether women with psoriasis differed from women without psoriasis with respect to comorbidities, socioeconomic status, healthcare consumption, and drug use, as well as how these characteristics differed according to psoriasis severity. METHODS: In this nationwide, register-based, cross-sectional study, data were collected from Danish registries from 1977 to 2017, linked at the individual level, and identified by International Classification of Diseases codes, prescription data, income and educational information, and contact with public health care services. Psoriasis was defined by either a hospital International Classification of Diseases code for psoriasis or calcipotriol prescription data. Psoriasis severity was stratified based on psoriasis treatment. Age-adjusted logistic regression models were used to estimate the odds ratios (ORs) of outcomes compared with those of women without psoriasis. RESULTS: A total of 77,143 women (3%) met the criteria for psoriasis. Psoriasis was significantly associated with all investigated outcomes. Women with psoriasis were less likely to have a high income (OR: 0.89; 95% confidence interval [CI], 0.87-0.91), more likely to visit their general practitioner more often (OR: 3.82; 95% CI, 3.70-3.95), and received pain medication more often (OR: 1.57; 95% CI, 1.52-1.62) compared with women without psoriasis. CONCLUSION: Psoriasis was significantly associated with all investigated adverse medical and socioeconomic outcomes. Risk of outcomes increased with psoriasis severity. Our study highlights the need for a multidisciplinary collaboration to optimize medical care for women with (especially moderate and severe) psoriasis.

Increased all-cause mortality in concomitant atopic dermatitis and asthma: A nationwide registry-based study.

BACKGROUND: Excess mortality has been reported for adults with atopic dermatitis (AD) and asthma. OBJECTIVE: To assess the mortality rate in adults with concomitant AD and asthma. METHODS: Adults with hospital-diagnosed AD were matched (1:4) with non-AD individuals from the background population. RESULTS: The study cohort comprised 8,095 adults with AD (of which 1,201 (14.8%) had concomitant asthma) and 32,380 reference individuals without AD from the background population (of which 878 (2.7%) had asthma). A total of 1,057, 330, 55 and 99 deaths were observed among subjects with neither AD nor asthma, AD only, asthma only, and subjects with concomitant AD and asthma, respectively. The mortality rate per 1,000 person-years was 4.75 (95% CI 4.47-5.05) for subjects with neither AD nor asthma, 7.17 (95% CI 5.92-10.05) for asthma only, 7.09 (95% CI 6.37-7.90) for AD only and 10.87 (95% CI 8.92-13.23) for concomitant AD and asthma. Risk for all-cause mortality was increased in subjects with concomitant AD and asthma compared to asthma only (HR 1.52, 95% CI 1.07-2.15) and neither AD nor asthma (HR 2.27, 95% CI 1.83-2.81) but not compared to subjects with AD only (HR 1.10, 95% CI 0.87-1.39). However, compared to AD only subjects with AD and asthma had increased risk of death due to pulmonary disease (HR 1.81, 95% CI 1.04-3.15). CONCLUSION: Adults with AD, asthma or both conditions have increased risk of death, and further concomitant AD and asthma have increased risk of death compared with asthma alone.