The Link Between Psoriasis And Bariatric Surgery

Psoriasis a chronic auto-immune-related skin condition where scaly patches appear on the skin affects 7.5 million Americans, according to the National Psoriasis Foundation. And it is estimated that 20 percent of people with moderate to severe psoriasis develop psoriatic arthritis which can lead to joint pain. 

Typically, treatment requires a coordinated effort of dermatologists and rheumatologists to manage the symptoms, which include inflammation, swelling and skin changes. A new study by researchers at the NYU Langone Medical Center suggests that psoriasis and psoriatic arthritis symptoms are lessened significantly in patients that undergo bariatric weight loss surgery.

For the study, the researchers reviewed the medical charts of 9,073 weight-loss surgery patients who were treated between 2002 and 2013 at NYU Langones Weight Management Program. They identified 86 patients who had psoriasis before their operation, 21 of whom were also diagnosed with psoriatic arthritis, and compared their symptoms before and after undergoing bariatric surgery. The research team compared their patients symptoms from before and after undergoing bariatric surgery.

The Findings

The findings reveal that:

Losing excess weight may improve symptoms in people who have these lifelong conditions.

Fifty-five percent of patients with psoriasis and 62 percent of patients with psoriatic arthritis reported improvements in their disease.

Patients who underwent surgery saw significant reductions in their disease severity scores at post-surgical follow-up - according to a 0 to 10 rating scale - with disease severity scores in patients with psoriasis dropping from 5.6 to 4.4, and scores falling from 6.4 to 4.5 for those with psoriatic arthritis.

Results were even more pronounced in those with severe disease activity, with scores falling from 7.7 before surgery to 5.7 after for patients with severe psoriasis, and from 8.2 to 4.8 after surgery for patients with severe psoriatic arthritis.

Further analysis showed those who lost the most excess weight a year after surgery showed the biggest improvements in their disease activity. Patients who saw the most improvements had more severe disease at the time of surgery and were of an older age at diagnosis.

The researchers believe that: 

Obesity may contribute to the risk for development of psoriasis and psoriatic arthritis through fat tissue-driven systemic inflammation.

Excess weight loss may reduce the body-wide inflammation and pain triggered by extreme excesses of fat tissue.

This study highlights the collaborative spirit of academic medicine, and how our rheumatology and bariatric surgery researchers worked together to not only help our patients directly, but inform the medical community at large, says study co-authorJose U. Scher, MD,assistant professor of rheumatology and co-director of the NYU Langones Psoriatic Arthritis Center. These findings can be used to identify people who may benefit most from this type of intervention.

Psoriasis and psoriatic arthritis are chronic inflammatory conditions that can be quite uncomfortable and often painful for patients, so any treatment that might reduce symptoms may improve quality of life, added lead study author Soumya Reddy, MD,an assistant professor of medicine in the division of rheumatology at NYU Langone, and co-director ofNYU Langones Psoriatic Arthritis Center. Our new study shows that those who shed excess weight could see significant symptomatic relief.

Next, the researchers plan to conduct larger studies to further define their findings and the effects of excess weight loss and bariatric surgery on psoriasis and psoriatic arthritis disease activity. 

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