The associations between psychological stress and psoriasis: a systematic review

Defining well-being in psoriasis: A Delphi consensus among healthcare professionals and patients

Psoriasis is a chronic skin disease that negatively impacts on patient's life. A holistic approach integrating well-being assessment could improve disease management. Since a consensus definition of well-being in psoriasis is not available, we aim to achieve a multidisciplinary consensus on well-being definition and its components. A literature review and consultation with psoriasis patients facilitated the design of a two-round Delphi questionnaire targeting healthcare professionals and psoriasis patients. A total of 261 panellists (65.1% patients with psoriasis, 34.9% healthcare professionals) agreed on the dimensions and components that should integrate the concept of well-being: emotional dimension (78.9%) [stress (83.9%), mood disturbance (85.1%), body image (83.9%), stigma/shame (75.1%), self-esteem (77.4%) and coping/resilience (81.2%)], physical dimension (82.0%) [sleep quality (81.6%), pain/discomfort (80.8%), itching (83.5%), extracutaneous manifestations (82.8%), lesions in visible areas (84.3%), lesions in functional areas (85.8%), and sex life (78.2%)], social dimension (79.5%) [social relationships (80.8%), leisure/recreational activities (80.3%), support from family/friends (76.6%) and work/academic life (76.5%)], and satisfaction with disease management (78.5%) [treatment (78.2%), information received (75.6%) and medical care provided by the dermatologist (80.1%)]. This well-being definition reflects patients' needs and concerns. Therefore, addressing them in psoriasis will optimise management, contributing to better outcomes and restoring normalcy to the patient's life.

Arsenic trioxide liposome gels for the treatment of psoriasis in mice

Psoriasis is a chronic, immune-mediated skin disease with no cure. Intravenous arsenic trioxide (ATO) has been used to treat psoriasis in animal studies. However, the high toxicity of ATO limits its application to clinics for systemic administration. The aim of this study was to fabricate sustained-release ATO liposome gels (ATO-Lip-Gels) to be used for the treatment of psoriasis. The ATO Liposomes were prepared using a zinc acetate gradient method. ATO concentrations were analyzed by HPLC-HG-AFS. The ATO-Lip-Gels were characterized with respect to size, zeta potential, and entrapment efficiency. Stability, in vitro drug release, and in vivo efficacy were also evaluated. The optimal formulation of ATO-Lip was ATO (0.45%), S100 (9%), and cholesterol (1.5%) (W/V) in 0.3 mol/L zinc acetate and incubated for 10 min. In the in vitro drug release study, ATO-Lip-Gels exhibited a slower release profile of ATO than that from Gels only. Compared with the model group, ATO-Lip-Gels-H significantly reduced PASI scores after psoriasis in mice and was superior to tacrolimus at day 5. HE staining showed that the pathological changes caused by psoriasis in mice were significantly improved in the treatment groups, and ATO-Lip-Gels-H had the best effect among the treatment groups. ATO-Lip-Gels applied topologically to imiquimote-induced psoriatic plaque models significantly reduced the levels of key psoriatic cytokines such as IL-6 and TNF-α. We have developed ATO-Lip-Gels for the treatment of psoriasis, which demonstrated higher efficacy with the benchmark, Tacrolimus, and can be an alternative to the conventional treatment with Tacrolimus.

Influence of stress resilience in adolescence on long-term risk of psoriasis and psoriatic arthritis among men: A prospective register-based cohort study in Sweden

BACKGROUND

Although stress is considered to be a negative factor for psoriasis, no convincing scientific evidence of this association exists, largely because of difficulties in measuring stress. Stress resilience is the ability to cope with and adapt to stressful events. Stress resilience can be measured in a standardized way and used as a marker for chronic stress.

OBJECTIVES

The objective of this study is to investigate whether low stress resilience in adolescence increases the risk for onset of psoriasis and psoriatic arthritis later in life.

METHODS

A cohort of Swedish men (mean age 18.3 years), enrolled in compulsory military service between 1968 and 2005, was created using data from the Swedish Military Service Conscription Register (n = 1,669,422). Stress resilience at conscription was estimated using standardized semi-structured interviews, and was divided into three categories: low, medium and high. The men were followed from conscription until new-onset psoriasis or psoriatic arthritis, death or emigration or at the latest until 31 December 2019. Cox regression models adjusted for confounders at conscription were used to obtain hazard ratios (HRs) with 95% confidence intervals (CIs) for incident psoriasis and psoriatic arthritis.

RESULTS

Men in the lowest stress resilience category had an increased risk of psoriasis and psoriatic arthritis (HR 1.31 (95% CI 1.26-1.36) and 1.23 (95% CI 1.15-1.32), respectively), compared with those in the highest stress resilience category. When including only hospitalized patients the HRs for psoriasis and psoriatic arthritis in the lowest stress resilience group were 1.79 (1.63-1.98) and 1.53 (1.32-1.77), respectively.

CONCLUSIONS

This large, prospective register study suggests that low stress resilience in adolescence is associated with an increased risk of incident psoriasis among men. The results indicate that patients with psoriasis have an inherent psychological vulnerability, and highlight the importance of addressing psychological well-being in the management of psoriasis.

Etiopathogenesis of Psoriasis: Integration of Proposed Theories

Psoriasis is a chronic inflammatory disease characterized by squamous and erythematous plaques on the skin and the involvement of the immune system. Global prevalence for psoriasis has been reported around 1-3% with a higher incidence in adults and similar proportions between men and women. The risk factors associated with psoriasis are both extrinsic and intrinsic, out of which a polygenic predisposition is a highlight out of the latter. Psoriasis etiology is not yet fully described, but several hypothesis have been proposed: 1) the autoimmunity hypothesis is based on the over-expression of antimicrobial peptides such as LL-37, the proteins ADAMTSL5, K17, and hsp27, or lipids synthesized by the PLA2G4D enzyme, all of which may serve as autoantigens to promote the differentiation of autoreactive lymphocytes T and unleash a chronic inflammatory response; 2) dysbiosis of skin microbiota hypothesis in psoriasis has gained relevance due to the observations of a loss of diversity and the participation of pathogenic bacteria such as Streptococcus spp. or Staphylococcus spp. the fungi Malassezia spp. or Candida spp. and the virus HPV, HCV, or HIV in psoriatic plaques; 3) the oxidative stress hypothesis, the most recent one, describes that the cell injury and the release of proinflammatory mediators and antimicrobial peptides that leads to activate of the Th1/Th17 axis observed in psoriasis is caused by a higher release of reactive oxygen species and the imbalance between oxidant and antioxidant mechanisms. This review aims to describe the mechanisms involved in the three hypotheses on the etiopathogeneses of psoriasis.

Triggers for the onset and recurrence of psoriasis: a review and update

Psoriasis is an immune-mediated inflammatory skin disease, involving a complex interplay between genetic and environmental factors. Previous studies have demonstrated that genetic factors play a major role in the pathogenesis of psoriasis. However, non-genetic factors are also necessary to trigger the onset and recurrence of psoriasis in genetically predisposed individuals, which include infections, microbiota dysbiosis of the skin and gut, dysregulated lipid metabolism, dysregulated sex hormones, and mental illness. Psoriasis can also be induced by other environmental triggers, such as skin trauma, unhealthy lifestyles, and medications. Understanding how these triggers play a role in the onset and recurrence of psoriasis provides insights into psoriasis pathogenesis, as well as better clinical administration. In this review, we summarize the triggers for the onset and recurrence of psoriasis and update the current evidence on the underlying mechanism of how these factors elicit the disease. Video Abstract.

Psychodermatology in Lithuania. A survey on knowledge, awareness, and practice patterns in Lithuanian dermatovenereologists

The aim of this study was to evaluate the knowledge, awareness, and practice patterns of Lithuanian dermatovenereologists regarding psychocutaneous medicine. An online survey questionnaire was distributed to the members of the Lithuanian Association of Dermatovenereologists and to dermatovenereologists through public and private healthcare institutions in Lithuania. The questionnaire consisted of questions related to dermatovenereologists' awareness, knowledge, experience, and training needs regarding psychocutaneous disorders. 50% of respondents reported having a good or excellent understanding and knowledge of psychodermatology, and 42% feel prepared to consult psychodermatology patients. 54% of doctors rated their preparedness to prescribe psychopharmacological treatment as poor. The most frequent diagnoses referred to mental health professionals were dermatitis artefacta, acne excoriée, other self-inflicted dermatoses, trichotillomania, and pruritus. The most common course of action with patients at high risk of suicide or other acute psychiatric condition was trying to provide psychological support during dermatovenereology consultation. The most frequent management tactic for patients with chronic psychological problems was a referral to a psychiatrist. 85% of all respondents would participate in educational events about psychodermatology. 70% expressed interest in events about psychopharmacological treatment in dermatology. Lithuanian dermatovenereologists have a good understanding and knowledge of psychodermatology and are willing to further their education in this field. However, some gaps remain. Many doctors reported feeling poorly prepared to administer psychopharmacological treatment to their patients and there seems to be a lack of formal training in psychodermatology in Lithuania.

Apremilast Adherence and Persistence in Patients with Psoriasis and Psoriatic Arthritis in the Telehealth Setting Versus the In-person Setting During the COVID-19 Pandemic

INTRODUCTION

Limited access to healthcare during the COVID-19 pandemic prompted patients to seek care using telehealth. In this study, we assessed whether treatment patterns differed for patients with psoriasis (PsO) or psoriatic arthritis (PsA) initiating apremilast by either a telehealth or an in-person visit.

METHODS

We estimated adherence and persistence among US patients in the Merative© MarketScan© Commercial and Supplemental Medicare Databases who newly initiated apremilast between April and June 2020, categorized by the type of visit (telehealth or in-person) when apremilast was first prescribed. Adherence was defined as the proportion of days covered (PDC), with PDC ≥ 0.80 considered to indicate high adherence. Persistence was defined as having apremilast available to take without a 60-day gap during follow-up. Factors associated with high adherence and persistence were estimated with logistic and Cox regression.

RESULTS

Among apremilast initiators (n = 505), the mean age was 47.6 years, 57.8% were female, and the majority had PsO (79.6%). Telehealth index visits were more likely among patients residing in Northeast USA (odds ratio [OR] 3.31, 95% confidence interval [CI] 1.63-6.71) and Western USA (OR 2.52, 95% CI 1.07-5.93]), those with a prescribing rheumatologist (OR 2.27, 95% CI 1.10-4.68), and those with any baseline telehealth visit (OR 1.91, 85% CI 1.20-3.04). Those initiating apremilast with a telehealth visit (n = 141) had similar mean PDC to those initiating apremilast with an in-person visit (n = 364) (0.695 vs. 0.728; p = 0.272). At the end of the 6-month follow-up, 54.3% of the overall population had high adherence (PDC ≥ 0.80) and 65.1% were persistent. After adjusting for potential confounders, patients initiating apremilast via telehealth had similar full adherence (OR 0.80, 95% CI 0.52-1.21) and persistence as those initiating apremilast in-person.

CONCLUSION

Patients with PsO and patients with PsA initiating apremilast via telehealth or in-person during the COVID-19 pandemic had similar medication adherence and persistence during the 6-month follow-up period. These data suggest that patients initiating apremilast can be as effectively managed with telehealth visits as with in-person visits.

Shared Genetic Risk Factors for Multiple Sclerosis/Psoriasis Suggest Involvement of Interleukin-17 and Janus Kinase-Signal Transducers and Activators of Transcription Signaling

OBJECTIVE

Psoriasis and multiple sclerosis (MS) are complex immune diseases that are mediated by T cells and share multiple comorbidities. Previous studies have suggested psoriatic patients are at higher risk of MS; however, causal relationships between the two conditions remain unclear. Through epidemiology and genetics, we provide a comprehensive understanding of the relationship, and share molecular factors between psoriasis and MS.

METHODS

We used logistic regression, trans-disease meta-analysis and Mendelian randomization. Medical claims data were included from 30 million patients, including 141,544 with MS and 742,919 with psoriasis. We used genome-wide association study summary statistics from 11,024 psoriatic, 14,802 MS cases, and 43,039 controls for trans-disease meta-analysis, with additional summary statistics from 5 million individuals for Mendelian randomization.

RESULTS

Psoriatic patients have a significantly higher risk of MS (4,637 patients with both diseases; odds ratio [OR] 1.07, p = 1.2 × 10-5 ) after controlling for potential confounders. Using inverse variance and equally weighted trans-disease meta-analysis, we revealed >20 shared and opposing (direction of effect) genetic loci outside the major histocompatibility complex that showed significant genetic colocalization (in COLOC and COLOC-SuSiE v5.1.0). Co-expression analysis of genes from these loci further identified distinct clusters that were enriched among pathways for interleukin-17/tumor necrosis factor-α (OR >39, p < 1.6 × 10-3 ) and Janus kinase-signal transducers and activators of transcription (OR 35, p = 1.1 × 10-5 ), including genes, such as TNFAIP3, TYK2, and TNFRSF1A. Mendelian randomization found psoriasis as an exposure has a significant causal effect on MS (OR 1.04, p = 5.8 × 10-3 ), independent of type 1 diabetes (OR 1.05, p = 4.3 × 10-7 ), type 2 diabetes (OR 1.08, p = 2.3 × 10-3 ), inflammatory bowel disease (OR 1.11, p = 1.6 × 10-11 ), and vitamin D level (OR 0.75, p = 9.4 × 10-3 ).

INTERPRETATION

By investigating the shared genetics of psoriasis and MS, along with their modifiable risk factors, our findings will advance innovations in treatment for patients suffering from comorbidities. ANN NEUROL 2023;94:384-397.

Brief Maternal Separation Promotes Resilience to Anxiety-like and Depressive-like Behaviors in Female C57BL/6J Offspring with Imiquimod-Induced Psoriasis

Background: Psoriasis is a common chronic inflammatory skin disease that often causes depression. Early life experience affects brain development and relates to depression. Whether the effect of different MS protocols in early life on anxiety-like and depressive-like behaviors in female offspring with imiquimod (IMQ)-induced psoriasis is unknown. Methods: C57BL/6J mice were subjected to no separation (NMS), brief MS (15 min/day, MS15) or long MS (180 min/day, MS180) from postpartum days (PPD) 1 to PPD21. Then, 5% imiquimod cream was applied for 8 days in adults. Behavioral tests, skin lesions and hippocampal protein expression were also assessed. Results: We found significant psoriasis-like skin lesions in female mice following IMQ application, and mice showed anxiety-like and depressive-like behaviors. Further, increased microglial activation and decreased expression of neuroplasticity were detected in mice following IMQ application. However, after MS15 in early life, mice showed decreased anxiety-like and depressive-like behaviors, indicating resilience. Further, inhibited hippocampal neuroinflammation and increased neuroplasticity were detected. Conclusions: Collectively, this study confirms that brief MS confers resilience to the behavior deficits in female offspring with IMQ-induced psoriasis and reverses the activation of neuroinflammation and the damage of neuroplasticity injury.

The impact of perceived stress on the hair follicle: Towards solving a psychoneuroendocrine and neuroimmunological puzzle

While popular belief harbors little doubt that perceived stress can cause hair loss and premature graying, the scientific evidence for this is arguably much thinner. Here, we investigate whether these phenomena are real, and show that the cyclic growth and pigmentation of the hair follicle (HF) provides a tractable model system for dissecting how perceived stress modulates aspects of human physiology. Local production of stress-associated neurohormones and neurotrophins coalesces with neurotransmitters and neuropeptides released from HF-associated sensory and autonomic nerve endings, forming a complex local stress-response system that regulates perifollicular neurogenic inflammation, interacts with the HF microbiome and controls mitochondrial function. This local system integrates into the central stress response systems, allowing the study of systemic stress responses affecting organ function by quantifying stress mediator content of hair. Focusing on selected mediators in this "brain-HF axis" under stress conditions, we distill general principles of HF dysfunction induced by perceived stress.

Clinical Application of Restrictive Brace Combined with Psychological Intervention after Replantation of Severed Fingers in Children

Objective

After replantation of severed fingers in infants, the utility model patent upper limb restrictive brace-assisted bed rest braking, combined with psychological intervention, can alleviate children's anxiety, so as to reduce the occurrence of vascular crisis.

Methods

The study period was from April 2015 to July 2018. In this paper, 30 children with finger injuries in hand surgery in the CIS electronic medical record system of Cangzhou Integrated Traditional Chinese and Western Medicine Hospital were selected as the research objects. Replantation was performed in 30 infants with severed fingers. Among them, 15 cases were applied with the method of aircraft chest arm gypsum splint combined with sedative drug braking and the utility model patented product upper limb restrictive brace fixation-assisted bed rest braking, and the method of psychological intervention was applied at the same time.

Results

Among the 15 fingers in the control group, 6 had vascular crisis and 1 in the experimental group. The incidence of vascular crisis in the experimental group was lower, and the difference between the two groups was statistically significant (P < 0.05). The patients were followed up for 9~18 months, with an average of 9.72 ± 1.07 months. In the control group, 15 cases of severed fingers survived, and there were 13 cases of replantation finger necrosis in 2 cases of intractable arterial crisis. In the experimental group, 14 cases of severed fingers survived in 15 cases and there was 1 case of replanted finger necrosis in intractable arterial crisis after operation. There was no significant difference in the survival rate between the two groups (P > 0.05). In addition, the replanted finger function was evaluated. In the control group, 9 cases were excellent, 4 cases were good, and 1 case was fair. In the experimental group, 14 cases were excellent, 1 case was good, and 0 case was fair. The functional evaluation of the experimental group was better than that of the control group, and the difference between the two groups was statistically significant (P < 0.05).

Conclusion

For infants after replantation of severed fingers, the application of the utility model patented product upper limb restrictive brace can effectively make up for the insufficient fixation of aircraft chest arm gypsum splint, reduce the occurrence of vascular crisis, and assist children in bed. In addition, the application of psychological intervention can reduce children's postoperative crying and is conducive to children's postoperative recovery.

Epidemiology of Psoriasis and Comorbid Diseases: A Narrative Review

Psoriasis is a chronic autoimmune inflammatory disease that remains active for a long period, even for life in most patients. The impact of psoriasis on health is not only limited to the skin, but also influences multiple systems of the body, even mental health. With the increasing of literature on the association between psoriasis and extracutaneous systems, a better understanding of psoriasis as an autoimmune disease with systemic inflammation is created. Except for cardiometabolic diseases, gastrointestinal diseases, chronic kidney diseases, malignancy, and infections that have received much attention, the association between psoriasis and more systemic diseases, including the skin system, reproductive system, and oral and ocular systems has also been revealed, and mental health diseases draw more attention not just because of the negative mental and mood influence caused by skin lesions, but a common immune-inflammatory mechanism identified of the two systemic diseases. This review summarizes the epidemiological evidence supporting the association between psoriasis and important and/or newly reported systemic diseases in the past 5 years, and may help to comprehensively recognize the comorbidity burden related to psoriasis, further to improve the management of people with psoriasis.

The Effects of Interacting With a Paro Robot After a Stressor in Patients With Psoriasis: A Randomised Pilot Study

Objective

Stress can play a role in the onset and exacerbation of psoriasis. Psychological interventions to reduce stress have been shown to improve psychological and psoriasis-related outcomes. This pilot randomised study investigated the feasibility of a brief interaction with a Paro robot to reduce stress and improve skin parameters, after a stressor, in patients with psoriasis.

Methods

Around 25 patients with psoriasis participated in a laboratory stress task, before being randomised to either interact with a Paro robot or sit quietly (control condition) for 30 min. Raman spectroscopy and trans-epidermal water loss were measured at baseline, after the stressor and after the intervention as indexes of acute skin changes. Psychological variables, including self-reported stress and affect, were also measured at the three time-points.

Results

No statistically significant differences between the two conditions were found for any of the outcomes measured. However, effect sizes suggest significance could be possible with a larger sample size. Changes in the psychological and Raman spectroscopy outcomes across the experimental session were found, indicating the feasibility of the procedures.

Conclusion

This pilot study showed that a brief interaction with a Paro robot was a feasible intervention for patients with psoriasis, but future trials should broaden the inclusion criteria to try to increase recruitment rates. Studying people who are highly stressed, depressed or who are stress-responders may increase the power of the intervention to show effects using a longer-term intervention.

Acute Psoriatic Exacerbation Secondary to Infected Pacemaker With Staphylococcus aureus and Candida lusitaniae?

Psoriasis is a lifelong chronic hyperproliferative inflammatory immune-mediated disorder. There is a strong association of psoriasis exacerbation with infection of Staphylococcus and Streptococcus species. In the case of our patient, a psoriatic flare manifesting as dactylitis occurred secondary to methicillin sensitive Staphylococcus aureus bacteremia colonization of his pacemaker. If a patient is started on an antibiotic regimen, such as vancomycin, and has symptoms of rash, and swelling in the fingers, it is imperative to ask for a proper rheumatologic history, as vancomycin infusion reaction (previously known as Red Man Syndrome) may not be the cause of the flare-up, such as in the case of our patient. Inversely, patients with psoriasis are more likely to be colonized by S. aureus on the skin and in the nasal cavity, and this can lead to bacteremia and infection of hardware, such as an automatic implantable cardioverter-defibrillator (AICD).

The Effect of Lifestyle Changes on Disease Severity and Quality of Life in Patients with Plaque Psoriasis: A Narrative Review

Objective

To evaluate the effect of lifestyle changes on the severity of psoriasis and the quality of life in patients with psoriasis.

Methods

For this narrative review, PubMed, Embase and ClinicalTrials.gov were searched for lifestyle intervention studies with an intervention duration of at least 12 weeks.

Results

Thirty-four intervention studies were included. Most studies performed interventions in the diet of patients with psoriasis (n=9), or added supplements to the diet (n=18). Three studies comprised relaxation techniques and four studies combined relaxation or stress-reducing techniques with an educational program or exercise. No interventional studies were carried out regarding smoking, alcohol and sleep. Especially dietary and relaxation interventions showed promising results with respect to psoriasis severity and dermatology-related QoL, respectively. Regarding dietary supplements, the three largest studies investigating fish oil or vitamin D did not show significant effects.

Conclusion

There is some evidence that dietary and relaxation interventions could be promising with respect to psoriasis severity and dermatology-related QoL, respectively. Furthermore, our review identified important gaps in psoriasis lifestyle research regarding study design and reporting of outcomes.

Calcitonin gene-related peptide upregulates IL-17A and IL-22 in γδ-T cells through the paracrine effect of langerhans cells on LC/γδ-T co-culture model

Intense mental stimulation and stress often directly induce or exacerbate psoriasis. On the contrary, patients with nerve injury and nervous system dysfunction have psoriasis remission. The nervous system plays an important role in the inflammatory process of psoriasis, and neuropeptides are considered as local mediators of disease maintenance. To examine the molecular mechanism involved in this, first we analyzed calcitonin gene-related peptide (CGRP)-treated langerhans Cells and γδ-T cells separately. CGRP induced IL-23 mRNA and protein expression via PDK1-Rsk signaling pathway. However, CGRP had no effect on secretion of IL-17A and IL-22 in γδ-T cells. Then we treated LCs/γδ-T cells Co-culture Model with CGRP. CGRP upregulated IL-17A and IL-22 expression in co-culture model through the paracrine effect of LCs. IL-17A and IL-22 are key cytokines of psoriasis. These findings provide a potential mechanism by which nerve factors affect the development of psoriasis.

Terrestrosin D ameliorates skin lesions in an imiquimod-induced psoriasis-like murine model by inhibiting the interaction between Substance P and Dendritic cells

BACKGROUND

Psoriasis is a psychosomatic immune skin disease with psychological factors contributing to the disease. Substance P (SP) is highly expressed in the psoriatic lesions of patients and is involved in pathological disease progression. Tribulus terrestris L. has been used as a Chinese herbal medicine for disease prevention for thousands of years. Terrestrosin D (TED) has been identified as the effective monomeric component of Tribulus terrestris L..

PURPOSE

We investigated whether TED could reverse imiquimod-induced psoriatic lesions, and then, investigated its potential mechanism of action both in vivo and in vitro.

METHODS

5% imiquimod cream was applied onto the backs of mice for 6 days to induce psoriasis-like skin lesions. The psoriatic area and severity index (PASI) was then used for scoring disease severity. Pathological changes and Ki-67 expression levels in skin lesions were measured using hematoxylin and eosin (H&E) and immunofluorescence staining after TED administration. The in vivo and in vitro expression levels of inflammatory cytokines, the ratio of DCs, and SP were measured using ProcartaPlex Mouse Cytokine panels, flow cytometry, and western blotting. Behavioral assessments were determined using the open field and elevated plus-maze (EPM) test.

RESULTS

TED decreased PASI scores, epidermal thickness, Ki-67 expression levels, the ratio of DCs in the spleen, and secretion of IL-12p70, IL-18, and TNF-α in imiquimod-induced psoriasis-like murine models. Furthermore, TED increased IL-10 secretion levels, improved behavior, and down-regulated the expression levels of SP. Additionally, TED inhibited the in vitro maturation and activation of SP-induced CD11c⁺ DCs and the release of IL-12p70 and IL-23.

CONCLUSION

TED reduced DCs maturation, down-regulated the expression levels of inflammatory factors, and improved skin lesions and behavior of psoriasis-like murine models by inhibiting the interaction between Substance P and Dendritic cells.

Skin Manifestations in Psoriatic and HS Patients in Treatment with Biologicals during the COVID-19 Pandemic

The Coronavirus Disease 2019 (COVID-19) pandemic, a global public health emergency, has changed dermatology practice and daily routine in just under two years. Much has been written in the literature about COVID-19-associated skin manifestations. Nevertheless, much less has been written regarding skin manifestations in patients affected by severe immune-mediated skin diseases, e.g., psoriasis and hidradenitis suppurativa, undergoing biological treatment during the COVID-19 outbreak. Thus, the aim of this article is to provide the reader with an overview of the cutaneous manifestations during the COVID-19 pandemic in this subset of patients.

Resection of bilateral occipital lobe lesions during a single operation as a treatment for bilateral occipital lobe epilepsy

BACKGROUND

Neurosurgical treatment of severe bilateral occipital lobe epilepsy usually involves two operations several mos apart.

AIM

To evaluate surgical resection of bilateral occipital lobe lesions during a single operation as a treatment for bilateral occipital lobe epilepsy.

METHODS

This retrospective case series included patients with drug-refractory bilateral occipital lobe epilepsy treated surgically between March 2006 and November 2015.

RESULTS

Preoperative evaluation included scalp video-electroencephalography (EEG), magnetic resonance imaging, and PET-CT. During surgery (bilateral occipital craniotomy), epileptic foci and important functional areas were identified by EEG (intracranial cortical electrodes) and cortical functional mapping, respectively. Patients were followed up for at least 5 years to evaluate treatment outcome (Engel grade) and visual function. The 20 patients (12 males) were aged 4-30 years (median age, 12 years). Time since onset was 3-20 years (median, 8 years), and episode frequency was 4-270/mo (median, 15/mo). Common manifestations were elementary visual hallucinations (65.0%), flashing lights (30.0%), blurred vision (20.0%) and visual field defects (20.0%). Most patients were free of disabling seizures (Engel grade I) postoperatively (18/20, 90.0%) and at 1 year (18/20, 90.0%), 3 years (17/20, 85.0%) and ≥ 5 years (17/20, 85.0%). No patients were classified Engel grade IV (no worthwhile improvement). After surgery, there was no change in visual function in 13/20 (65.0%), development of a new visual field defect in 3/20 (15.0%), and worsening of a preexisting defect in 4/20 (20.0%).

CONCLUSION

Resection of bilateral occipital lobe lesions during a single operation may be applicable in bilateral occipital lobe epilepsy.

Addressing Climate-Related Health Impacts During the Patient Encounter: A Practical Guide for Pediatric Dermatologists

Pediatric populations are expected to bear most of the climate change impacts, with racial minorities and children living in poorer countries being particularly vulnerable. Given their relevance to cutaneous disease, dermatologists should be aware of these climate-sensitive health impacts and the ways in which they intersect with social factors. Strategies including targeted risk communication, motivational interviewing, and storytelling can help facilitate climate discussions during the patient encounter. In this article the authors summarize common dermatologic health impacts related to environmental exposures and provide sample scripts for climate messaging.

Psychological Stress and Salivary Cortisol Levels in Patients with Plaque Psoriasis

Psychological stress has long been recognized as a trigger for plaque psoriasis, and preliminary evidence suggests that psoriasis could be associated with alterations in the hypothalamic-pituitary-adrenal (HPA) axis, resulting in impaired cortisol response to stress. This study aimed to investigate psychological stress, anxiety, depression and salivary cortisol in psoriatic patients. A cross sectional study involving 126 adult patients with plaque psoriasis and 116 adult healthy controls was conducted. Demographic, clinical data, Perceived Stress Scale (PSS) and Hospital Anxiety and Depression Scale (HADS) were collected. Cases and controls were asked whether they felt stressed in the last month, whilst psoriatic patients were also interrogated whether they found that psoriasis could have been worsened by stress. Moreover, 54 randomly selected subjects (27 psoriasis patients and 27 controls) underwent salivary cortisol testing at 8 am. PSS, HADS depression and anxiety subscales were significantly higher in psoriatic patients than in controls (17.2 ± 0.6 vs. 15.1 ± 0.8 p = 0.0289), (9.5 ± 0.3 vs. 6.2 ± 0.3 p < 0.001) and (8.2 ± 0.4 vs. 4.2 ± 0.3 p < 0.001), respectively. A higher rate of psoriatic patients reported feeling stress over the last month (45% vs. 19%, p < 0.001), and stress was considered a potential trigger for psoriasis flare-ups in 69% of cases. Psoriasis was strongly associated with higher PSS and HADS scores independently of sex, body mass index, diabetes, hypertension, dyslipidemia, and occupational status. Salivary cortisol was significantly lower in psoriatic patients compared to controls (9.6 ± 0.5 vs. 14.0 ± 1.1 nmol/L, p < 0.001). In conclusion, psoriasis was associated with higher psychological stress, anxiety and depressive symptoms, and with impaired cortisol response to stress.

Treatment of psoriasis with biologics in the early COVID-19 pandemic: A study examining patient attitudes toward the treatment and disease course

Background

Since March 2020, the coronavirus disease 2019 (COVID‐19) pandemic has been ongoing all around the world with a wide range of clinical course including asymptomatic cases to severe and fatal respiratory tract disease. Patients on immunosuppressive treatments were predicted to be more susceptible to COVID‐19.

Aims

It was aimed to assess treatment continuity, the course of psoriasis and the course and clinical features of COVID‐19 in patients treated with biological agents for psoriasis at the early initial period of COVID‐19 pandemic.

Patients/Methods

Patients treated with biological agents for psoriasis at our institute were contacted by phone between 1 and 10 July 2020 and fulfilled a questionnaire about their continuity to psoriasis treatments, clinical course of psoriasis, and any suspicion/diagnosis of COVID‐19.

Results

A total of 106 patients, 41 females and 65 males, were enrolled. Mean age of the patients was 46.1 ± 12.1 years (range: 19–77). Median duration of psoriasis was 18 years (min–max: 1 month–51 years). Twenty‐four patients (22.6%) were using tumor necrosis alpha inhibitors (ETA:1, IFX:19, ADA:4), whereas 82 patients (77.4%) were using interleukin (IL) 12/23 or IL‐17 inhibitors (UST:48, SECU:30, IXE:4). Seventy‐six patients (71.7%) continued the treatment, whereas 30 patients (28.3%) interrupted the treatment voluntarily. Twenty out of 30 patients (66.6%) who interrupted the treatment had an exacerbation of psoriasis. None of the patients were diagnosed with COVID‐19 in the study period.

Conclusion

Patients with psoriasis who received biological therapy continued their treatment at a high rate during the early period of the COVID‐19 pandemic. No COVID‐19 diagnosis was made among patients whether they continued or discontinued treatment. Recurrence and exacerbation of psoriasis in a significant proportion of patients who interrupted treatment and absence of COVID‐19 diagnosis in each group support the importance and safety of continuity of biological treatments for psoriasis in COVID‐19 era.

How stress affects the skin: from designs to mechanisms

Linked Article: Schmidt et al. Br J Dermatol 2021; 185:130–138.

Prevalence and Characteristics of Psoriasis in Romania-First Study in Overall Population

Background: Psoriasis is a chronic inflammatory disease characterized by an excessive hyperproliferation of keratinocytes and a combination of genetic, epigenetic, and environmental influences. The pathogenesis of psoriasis is complex and the exact mechanism remains elusive. Objectives: The study of the prevalence of psoriasis will allow the estimation of the number of people suffering from this condition at the national level, as well as the development and validation of a questionnaire to estimate the prevalence and the risk factors associated with the disease. Methods: A quantitative research was conducted at a national level among the target population in order to validate the questionnaire and estimate the national prevalence. Results: Declaratively, the prevalence of psoriasis in the studied group (N = 1500) is 4%, the first symptoms appearing around the age of 50, with a certified diagnosis being made on average at 55 years. The prevalence of psoriasis vulgaris was 4.99%. Conclusions: The results obtained will be useful in guiding future initiatives and communication campaigns related to this condition, and the methodological approach used will provide the opportunity to make recommendations for improving similar initiatives in the future.

ActiPso: definition of activity types for psoriatic disease: A novel marker for an advanced disease classification

BACKGROUND

Assessment of psoriasis is exclusively done measuring severity using somatic scores such as the psoriasis area and severity index or patient-reported outcomes such as the dermatology life quality index. There is no established tool to measure a patient's individual psoriasis activity over time.

OBJECTIVES

Development of a new tool to classify psoriasis activity types.

METHODS

Open patient interviews were performed and adapted in several steps and by using different groups of patients. Wording of the tool's axis and description how to use it was optimized with the input of patients. The final ActiPso tool was used in a prospective study in psoriasis patients.

RESULTS

Four activity types could be identified describing psoriasis intensity (e.g. severity, itch, pain) over one typical year and an event/trigger type describing flares. In the study in 586 psoriasis patients of the 536 patients eligible for analysis 40.9% self-classified as type 1 ('stable'), 22.6% as type 2 ('unstable'), 30.6% as type 3 ('winter type') and 6.0% as type 4 ('summer type'), respectively. Flares of psoriasis as identified by the event/trigger type were reported in 36.1% of patients with activity type 1, 67.8% with type 2, 73.8% of type 3 and 59.4% of type 4, respectively.

CONCLUSIONS

Interviewed patients were able to describe their course of psoriatic disease and to name potential triggering factors. By doing so, activity types of psoriasis were defined for the first time and the importance of events/triggers for flares described and integrated into ActiPso types as a basis for advanced patient-centric management. A limitation of ActiPso is that in regions with no seasonal variations types 3 and 4 may not apply.

Arabic Translation and Validation of the Acceptance of Illness Scale and Person-Centered Dermatology Self-care Index

OBJECTIVE

To translate the Acceptance of Illness Scale (AIS) and Person-Centered Dermatology Self-care Index (PeDeSI) from English to Arabic and validate their use among Arabic-speaking patients with psoriasis.

METHODS

Forward-backward translation was used to translate AIS and PeDeSI from English to Arabic language. Validation of the developed Arabic versions was performed using a cross-sectional study design. Arabic-speaking psoriatic patients were asked to complete the Arabic AIS and PeDeSI tools. Patients were also asked to complete the Dermatology Life Quality Index (DLQI), which was used as a reference to study external validity. The correlation between questionnaires was tested using Spearman rank correlation test. Factor analysis was used to study the dimensionality of the various tools. Cronbach α coefficient was used to evaluate internal consistency of Arabic versions of AIS and PeDeSI. Floor or ceiling effects were detected if more than 15% of patients achieved the lowest or the highest possible scores, respectively.

RESULTS

A total of 116 Arabic patients with psoriasis submitted the questionnaires. Both translated questionnaires were unidimensional. The internal consistencies of the AIS and PeDeSI were excellent (α coefficient = .90) and good (α coefficient = .87), respectively. There was a significant negative moderate correlation between the AIS and DLQI (ρ = -0.44), whereas the PeDeSI and DLQI were significantly weakly correlated (ρ = -0.23). No floor or ceiling effects were detected.

CONCLUSIONS

The results suggest that the Arabic versions of the AIS and PeDeSI questionnaires fulfilled the criteria for validation and may be used in research and routine clinical practice with Arabic speakers.

New Insights in Physical Therapy and Rehabilitation in Psoriatic Arthritis: A Review

Psoriatic arthritis (PsA) is a complex, multiform and chronic inflammatory disease characterized by the association of psoriasis and arthritis with other musculoskeletal and extra-articular manifestations. The treatment of PsA is rapidly evolving due to the introduction of new biologic and small-molecule drugs, and the aim of treatment is to induce a condition of remission or low disease activity in all disease domains. However, unmet treatment needs still persist for those patients with impaired function, reduced quality of life or comorbidities. In this context, physical therapy and rehabilitation could provide additional benefits by reducing disease activity and improving function. Although a large number of studies have assessed the role of physical therapy and exercise in other forms of chronic inflammatory arthritis, such as axial spondyloarthritis and rheumatoid arthritis, evidence on their effect on persons with PsA is still lacking. However, some studies have reported the potential positive role of physical therapy on the different disease domains of PsA, in helping to improve disease activity, prevent or improve articular impairment, improve pain management and improve quality of life. Here, we review current evidence on physical therapy, exercise and rehabilitation in patients with PsA. In particular, we review the literature focusing on each domain, to provide evidence of efficacy and effectiveness of exercise and rehabilitation on skin, peripheral arthritis, axial involvement, dactylitis, enthesitis and comorbidities.

Depressive-like behaviors in mice with Imiquimod-induced psoriasis

Psoriasis is not only a chronic inflammatory skin disease but also a psychosomatic disorder. Depression is one of the most common associated diseases, which aggravates psoriatic skin lesions and affects the life quality of patients. Clinical experiments establish a correlation between psoriasis and depression; however, the mechanisms yet unclear because only a few related studies are available. Therefore, to investigate whether imiquimod-induced psoriasis-like mice showed depressive-like behavior, 5% imiquimod cream was smeared on the back of mice to induce psoriasis-like skin lesions for 8 days. Consequently, the psoriasis area and severity index (PASI) score, epidermal thickness, expression of Ki67 and CD3⁺ T lymphocyte, the content of IL-12p70, IL-17A, and IL-23 in skin lesions were increased. The psoriasis-like mice presented significant changes in body mass. The sugar water preference rate, the central area distance and area time, and the content of 3,4-dihydroxyphenylaceticacid (DOPAC) and noradrenaline (NE) in the prefrontal cortex, 5-hydroxytryptamine (5-HT), adrenaline (Ad), and DOPAC in the hippocampus, and Ad and γ-aminobutyric acid (GABA) in the hypothalamus of psoriasis-like mice were significantly decreased. The results showed that after the application of imiquimod, depressive-like behaviors appeared in psoriasis-like mice, and the secretion of related neurotransmitters was disordered. Thus, these mice could be used as animal models for studying psoriasis complicated with depression symptoms.

Positive Psychological Factors Are Associated With Better Spiritual Well-Being and Lower Distress in Individuals With Skin Diseases

In this study we examined whether aspects of positive functioning [reappraisal, sense of coherence (SOC), and positivity] were associated with spiritual well-being and psychological distress after controlling for negative functioning (skin-related symptoms, type of disease, and expressive suppression) in individuals with skin diseases. We also examined whether negative functioning aspects were linked to spiritual well-being and distress when controlling for aspects of positive functioning. The study used a cross-sectional design with a sample of 192 individuals with psoriasis and systemic sclerosis (SSc) (M age = 51.6 years, SD = 16.5). Two hierarchical multiple regressions were conducted to determine whether spiritual well-being and psychological distress were accounted for by skin-related symptoms, type of disease, emotion regulation strategies, SOC, and positivity. Positivity was the most important contributor to better spiritual well-being, followed by both the comprehensibility/manageability and meaningfulness SOC subscales, after controlling for the other variables. High skin-related symptoms and expressive suppression were associated with lower psychological distress, whereas high SOC and reappraisal correlated with higher psychological distress. The findings of this study pave the way for further research on how SOC and positivity may reduce the effects of both skin-related symptoms and emotion dysregulation and facilitate spiritual well-being of individuals with skin diseases. Interventions aimed to enhance inner resources of these individuals and help them to find a meaning in their experience of skin disease might reduce psychological distress and improve spiritual well-being. Our findings suggest that healthcare professionals should consider positive functioning aspects in future interventions for individuals with skin diseases.

The Role of Nociceptive Neurons in the Pathogenesis of Psoriasis

Psoriasis is a chronic inflammatory skin disease. Emerging evidence shows that neurogenic inflammation, induced by nociceptive neurons and T helper 17 cell (Th17) responses, has a fundamental role in maintaining the changes in the immune system due to psoriasis. Nociceptive neurons, specific primary sensory nerves, have a multi-faceted role in detecting noxious stimuli, maintaining homeostasis, and regulating the immunity responses in the skin. Therefore, it is critical to understand the connections and interplay between the nociceptive neurons and the immune system in psoriasis. Here, we review works on the altered innervation that occurs in psoriasis. We examine how these distinct sensory neurons and their signal transducers participate in regulating inflammation. Numerous clinical studies report the dysfunction of nociceptive neurons in psoriasis. We discuss the mechanism behind the inconsistent activation of nociceptive neurons. Moreover, we review how neuropeptides, involved in regulating Th17 responses and the role of nociceptive neurons, regulate immunity in psoriasis. Understanding how nociceptive neurons regulate immune responses enhances our knowledge of the neuroimmunity involved in the pathogenesis of psoriasis and may form the basis for new approaches to treat it.

Depressive, anxiety, stress, and insomnia symptoms in patients with psoriasis: a cross-sectional study

Introduction

Assessment of psychological well-being in psoriasis patients is recommended. However, studies evaluating depressive, anxiety, stress, and insomnia symptoms in Arabic patients with psoriasis are lacking.

Aim

To quantify levels of psoriasis-related depressive, anxiety, stress, and insomnia symptoms in Arabic patients with psoriasis.

Material and methods

A cross-sectional survey on patients’ demographics, disease characteristics, and psychological measures using the Patient Health Questionnaire-9, Generalized Anxiety Disorder 7-item scale, Depression Anxiety Stress Scale-21 (7-item stress subscale), and Insomnia Severity Index. The prevalence and scores of depressive, anxiety, stress, and insomnia symptoms were calculated. Multivariate linear regression models were developed to assess patients’ demographics and disease characteristics affecting the psychological measures.

Results

The analysis included 223 patients. The patients reported mild levels of depressive, anxiety, and insomnia symptoms (median (interquartile range (IQR)) scores: 9 (6–14), 6 (4–11), and 12 (4–18), respectively) and a moderate level of stress symptoms (median (IQR) score: 10 (5–14)). The prevalence of depressive, anxiety, stress, and insomnia symptoms were 47.1%, 32.7%, 59.6%, and 57%, respectively. Multivariate linear regression analyses revealed that for each unit increase in the impact of psoriasis on daily life, there were 5.7 (95% confidence intervals (CI): 3.7–7.8), 3.8 (95% CI: 1.8–5.7), 5.3 (95% CI: 3.1–7.4), and 6.5 (95% CI: 3.7–9.4) units increase in depression, anxiety, and stress, and insomnia scores, respectively.

Conclusions

The prevalence of depressive, anxiety, stress, and insomnia symptoms in Arabic patients with psoriasis was high. Clinical interventions, screening for psychiatric comorbidities, and consideration of psychotherapy should be implemented in this patient group.

Investigation of predictors of interest in a brief mindfulness-based intervention and its effects in patients with psoriasis at a rehabilitation clinic (SkinMind): an observational study and randomised controlled trial

INTRODUCTION

Psoriasis (PS) is a chronic inflammatory skin disease accompanied by reduced quality of life. Mindfulness is the ability to focus on the present moment without evaluation. Findings on the effects of 8-week mindfulness trainings in patients with PS reveal positive effects on the severity of the disease and quality of life. However, it remained unclear what distinguishes patients with PS interested in psychological interventions from those without interest and whether also a shorter, namely 2-week mindfulness-based intervention is beneficial in this patient group. This will be investigated with this study.

METHODS AND ANALYSES

Data will be collected at a rehabilitation clinic in Germany. The study is divided into two parts: study 1a is an observational study. Its aim is to investigate whether sociodemographic, skin-related and psychological factors are significant predictors of interest in a brief psychological intervention in 127 patients with PS. Study 1b is a randomised controlled trial, in which 60 patients (retrieved from study 1a) will be randomised to an intervention or control group (treatment as usual). The main outcome variables are mindfulness and self-compassion. In addition, mediation analyses will be used in an explorative manner to test whether there is a relationship between mindfulness/self-compassion and the severity of PS and whether it is mediated by itch catastrophising and fear of negative evaluation (first model) or perceived stress (second model).

ETHICS AND DISSEMINATION

The study protocol has been approved by the University of Giessen. Study results will be disseminated by publication of the results at (inter) national conferences and in scientific journals.

TRIAL REGISTRATION NUMBERS

DRKS00017426 and DRKS00017429.

Role of neuroimmune circuits and pruritus in psoriasis

Psoriasis is a chronic inflammatory skin disease presenting with an array of clinical phenotypes, often associated with pruritus. Environmental and psychological stressors can exacerbate psoriasis symptoms and provoke flares. Recent studies suggest a dysfunctional hypothalamic-pituitary-adrenal (HPA) axis in some patients with psoriasis that can result in immune dysregulation. The immune system, in turn, can communicate with the nervous system to induce, maintain or aggravate psoriasis. In the skin, peripheral sensory as well as autonomic nerves control release of inflammatory mediators from dendritic cells, mast cells, T cells or keratinocytes, thereby modulating inflammatory responses and, in case of sensory nerves, pruritus. In response to the environment or stress, cytokines, chemokines, proteases, and neuropeptides fluctuate in psoriasis and influence immune responses as well as nerve activity. Furthermore, immune cells communicate with sensory nerves which control release of cytokines, such as IL-23, that are ultimately involved in psoriasis pathogenesis. Nerves also communicate with keratinocytes to induce epidermal proliferation. Notably, in contrast to recent years the debilitating problem of pruritus in psoriasis has been increasingly appreciated. Thus, investigating neuroimmune communication in psoriasis will not only expand our knowledge about the impact of sensory nerves in inflammation and pruritus and give new insights into the impact of environmental factors activating neuroimmune circuits or of stress in psoriasis, but may also lead to novel therapies. This review summarizes the relevant literature on the role of neuroimmune circuits, stress and how the central HPA axis and its peripheral equivalent in the skin, impact psoriasis.

Psychological Therapies in Management of Psoriatic Skin Disease: A Systematic Review

BACKGROUND

Psoriasis is a chronic, immune-mediated skin disease shown to have a multifaceted relationship with psychological factors. Because these factors have been shown to both worsen and result from psoriasis, an increasing number of studies have sought to investigate the efficacy of various psychological interventions in psoriasis management.

METHODS

A systematic review of PubMed^® and Scopus^® databases was performed for studies investigating psychological interventions in psoriasis management published from 1 January 1990 through 4 November 2018. Primary articles published in English and conveying physical treatment outcomes were included, whereas articles not describing clinical outcomes were excluded. Studies supporting intervention efficacy were graded with a level of evidence according to the Scottish Intercollegiate Guidelines Network levels of evidence.

RESULTS

A total of 28 reports studying 27 unique sets of patients receiving psychological therapies in psoriasis management were identified, including three case reports and series and 24 clinical trials, investigating 1522 patients in total. Cognitive behavioral therapy and its variants, biofeedback, meditation and mindfulness-based therapies, hypnosis, music resonance therapy, motivational interviewing, emotional disclosure, and educational and multidisciplinary approaches have been studied in the treatment of psoriasis. Although 16 randomized controlled trials were included in this review, literature is limited by heterogeneity of methodology, analyses, and outcomes. Only 4 of 27 studies (three of which investigated cognitive behavioral therapy) were rated a level of evidence of 1+ or greater. Studies, overall, have sample sizes often < 50 patients, lack follow-up past 12 months, and have attrition rates > 20%.

CONCLUSIONS

Based on assigned levels of evidence, the most promising methods of psychological intervention in psoriasis include cognitive behavioral therapy, mindfulness-based therapies, motivational interviewing, and educational and interdisciplinary interventions. Further study is needed to determine the efficacy, practicality, and economic feasibility of these treatment options for patients with psoriasis.

The economic burden of psoriasis with high comorbidity among privately insured patients in the United States

OBJECTIVE

To evaluate the impact of comorbidities on healthcare resource use (HRU), and direct and indirect work-loss-related costs in psoriasis patients.

METHODS

Adults with psoriasis (≥2 diagnoses, the first designated as the index date) and non-psoriasis controls (no psoriasis diagnoses, randomly generated index date) were identified in a US healthcare claims database of privately-insured patients (data between January 2010 and March 2017 were used). Psoriasis patients were stratified based on the number of psoriasis-related comorbidities (0, 1-2, or ≥3) developed during the 12 months post-index. All outcomes were evaluated during the follow-up period, spanning the index date until the end of continuous health plan eligibility or data cut-off. HRU and costs per-patient-per-year (PPPY) were compared in psoriasis and non-psoriasis patients with ≥12 months of follow-up.

RESULTS

A total of 9,078 psoriasis (mean age = 44 years, 51% female) and 48,704 non-psoriasis (mean age = 41 years, 50% female) patients were selected. During the 12 months post-index, among psoriasis vs non-psoriasis patients, 71.0% vs 83.0% developed no psoriasis-related comorbidities, 26.3% vs 16.0% developed 1-2, and 2.6% vs 1.0% developed ≥3 psoriasis-related comorbidities. Compared to non-psoriasis patients, psoriasis patients had more HRU including outpatient visits (incidence rate ratios [IRRs] = 1.52, 2.03, and 2.66 for 0, 1-2, and ≥3 comorbidities, respectively [all p < 0.01]) and emergency room visits (IRRs = 1.12, 1.59, and 2.45 for 0, 1-2, and ≥3 comorbidities, respectively [all p < 0.01]) during the follow-up period. Psoriasis patients incurred greater total healthcare costs (mean cost differences [MCDs] = $1,590, $5,870, and $18,427, in patients with 0, 1-2, and ≥3 comorbidities, respectively [all p < 0.01]), and work-loss-related costs (MCDs = $335, $655, and $1,695, in patients with 0, 1-2, and ≥3 comorbidities, respectively [all p < 0.01]).

CONCLUSIONS

HRU and cost burden of psoriasis are substantial, and increase with the development of psoriasis-related comorbidities.