Many people with systemic lupus erythematosus, or SLE, worry about developing kidney disease because lupus can attack the kidneys.
Usually, doctors become especially concerned when patients develop lupus nephritis, the best-known kidney complication of lupus. However, new research suggests that patients without lupus nephritis may still need careful kidney monitoring.
Scientists from Cambridge University Hospitals NHS Foundation Trust studied whether people with lupus but normal kidney function remained at higher risk of kidney disease over time. Their findings, published in Rheumatology, suggest the answer is yes.
Lupus is an autoimmune disease in which the body’s immune system attacks its own tissues. Symptoms vary widely and may include joint pain, skin rashes, tiredness, fever, and inflammation affecting many organs. Because the disease is unpredictable, long-term follow-up is important.
For this study, researchers followed 1,145 newly diagnosed lupus patients who had normal kidney function and no signs of lupus nephritis. They compared them with 91,681 similar people without lupus. The participants were followed for almost six years on average.
At the start, both groups had almost identical kidney function. During follow-up, however, important differences appeared. People with lupus had a much greater chance of developing chronic kidney disease, progressing to end-stage kidney disease, experiencing major heart and blood vessel problems, and dying from any cause.
Interestingly, the overall decline in average kidney function looked similar between the groups, suggesting that some patients may experience sudden or uneven changes rather than a steady decline. The researchers also found that diabetes and high blood pressure greatly increased the risk of severe kidney disease.
These findings have important clinical implications. They suggest that doctors should continue checking kidney health in lupus patients even when no kidney disease is present at diagnosis. Routine blood tests, urine tests, and careful management of blood pressure and blood sugar may help reduce future complications.
The study also arrives at an important time because new treatments for chronic kidney disease are becoming available. Detecting kidney problems earlier may allow patients to benefit from these therapies before severe damage develops.
The research does have limitations. Because it relied on medical records, it cannot prove that lupus itself caused all of the increased risks. Some patients may also have had differences in treatment, lifestyle, or other illnesses that affected the results. Nevertheless, the very large study population makes the findings difficult to ignore.
Overall, this research reminds both patients and healthcare providers that lupus should be viewed as a whole-body disease. Even when kidney tests are normal at diagnosis, ongoing monitoring remains essential because the risk of future kidney disease and cardiovascular complications appears to stay elevated.
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The study was published in Rheumatology.
Source: Cambridge University Hospitals NHS Foundation Trust.
