Trial By Error: A Post About Lupus and MUS, Not COVID

By David Tuller, DrPH

This is another non-coronavirus post–my second in two days.

Before we were interrupted, I had been looking more into so-called €œmedically unexplained symptoms,€ or MUS. A recently published study with data on the length of time needed to obtain a diagnosis of systemic lupus erythematosus, commonly known as lupus, has highlighted some of the core problems with the MUS construct. I mentioned this study in my Zoom appearance last month with the Sheffield ME & Fibromyalgia Group.

The study is called “Medically explained symptoms: A mixed methods study of diagnostic, symptom and support experiences of patients with lupus and related systemic autoimmune diseases.” It was published on February 26th by the journal Rheumatology Advances in Practice. The corresponding author, Melanie Sloan, is a research associate in the Department of Public Health and Primary Care at Cambridge University.

“Systemic lupus erythematosus (SLE) is a chronic, inflammatory, autoimmune disease which can be life threatening,” write the authors. “With no definitive diagnostic tests for SLE and related diseases, and a diversity of often non-specific presenting symptoms1, patients are largely reliant upon expert medical opinion for a diagnosis, with delays in diagnosis and subsequent treatment commonly reported.”

Sloan and her co-investigators analyzed data from 233 respondents to an online questionnaire about the experiences of lupus patients. From the start of symptoms, the mean time to obtaining a lupus diagnosis was a month short of seven years. Three out of four reported at least one misdiagnosis along the way for symptoms that were ultimately found to relate to their autoimmune rheumatic disease. According to the study, €œmental health/non-organic misdiagnoses constituted 47% of reported misdiagnoses and were indicated to have reduced trust in physicians and to have changed future healthcare-seeking behaviour.€

The study’s findings are in line with some earlier research. For example, a 2014 survey of more than 2500 members of LUPUS UK found that the mean time to diagnosis from initial symptom awareness was 6.4 years. Almost half reported having been initially diagnosed with something else, 16% with €œchronic fatigue€ and 11% with a €œchronic psychological disorder.€

In the case of both studies, it would be possible to challenge the numbers as non-representatives, since responses to surveys are subject to various forms of bias. But the exact number of misdiagnoses is not the only point of interest. What the studies document is that, whatever the total, there are many such cases.

With lupus, the available research indicates that many patients receive one or more apparently mistaken diagnoses in the years prior to receiving a lupus diagnosis. The research also indicates that a significant minority of those who receive these misdiagnoses are categorized as having a psychological disorder or a non-organic disorder or €œchronic fatigue,€ which in this context is likely to be treated as a psychological and/or non-organic disorder.

What would be the treatment for the patients thus misdiagnosed? Certainly they would likely they would be referred to psychotherapy to treat the symptoms arising from their still-undiagnosed lupus. In England, these unfortunate patients might have been shunted off to the National Health Service’s metastasizing Improving Access to Psychological Therapies program. The program was launched in 2008 with the stated goal of targeting people with depression and anxiety disorders. It has since expanded to include patients with long-term conditions, such as cancer and diabetes, as well as MUS. For IAPT purposes, MUS patients are categorized as having CFS, IBS or unspecified MUS.

In recent years, members of the MUS ideological brigades have been hosting seminars and trainings for primary care physicians and other frontline health care providers. The goal of these events is to educate clinicians on how to diagnose MUS and counter patients’ requests for purportedly unnecessary medical tests. In England, these MUS experts have also promoted the need to divert such patients directly into IAPT, rather than sending them to specialist care.

I assume there might be a cohort of patients who were sent to IAPT for symptoms identified as MUS that were later properly and accurately attributed to lupus. It would be interesting to hear from any of them.



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