Organ threat ranks highest
Systemic lupus erythematosus (SLE) can affect almost any tissue, but the findings are not equally serious. When a client reports several new problems, the nurse ranks them by threat to a major organ. Foamy urine suggests proteinuria, puffy ankles show edema, and a blood pressure of 150/96 mmHg against her usual 110/70 mmHg is new hypertension. Together these findings suggest lupus nephritis, the most common serious organ involvement in SLE, which can progress to kidney failure. This is the finding to report as the most serious.
Why kidney involvement is so important
In lupus nephritis, immune complexes deposit in the glomeruli and cause inflammation. Damaged glomeruli leak protein into the urine, the loss of protein and retention of sodium cause edema, and impaired kidney function raises blood pressure. Early disease may cause few symptoms, so new edema, frothy urine, or a rise in blood pressure must be evaluated promptly with urinalysis for protein and blood, urine protein measurement, and serum creatinine. Early treatment can preserve kidney function.
| Finding | Meaning | Organ threat? |
|---|
| Foamy urine, ankle edema, BP 150/96 | Suggests lupus nephritis | Yes: kidney |
| Hair thinning | Disease activity | No |
| Morning stiffness of both wrists | Arthralgia or arthritis of SLE | No |
| Malar rash after sun exposure | Skin activity, photosensitivity | No |
Why the other findings rank lower
Hair thinning, morning joint stiffness, and a malar rash after sun exposure are all signs that the disease is active, and they deserve attention, but none threatens a vital organ. Joint involvement in SLE is common and usually non-erosive. The rash calls for sun protection and review of treatment. These findings are recorded and reported in the course of follow-up, but the kidney findings are reported first.
Watch out! In SLE and other systemic diseases, a new rise in blood pressure from a low baseline is easy to overlook. Compare every reading with the client's usual value; 150/96 mmHg is a large change for someone who usually runs 110/70 mmHg.
Exam takeaway
Key point! When ranking SLE findings, kidney, central nervous system, heart, and lung involvement come before skin, hair, and joint symptoms. Foamy urine, edema, and new hypertension point to lupus nephritis and need prompt evaluation of urine protein and creatinine.