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The kidneys can be injured in diverse ways. Demyelinated disease (Multiple sclerosis) can present with severe muscle spasticity. We report a case of acute kidney injury post rhabdomyolysis secondary to severe attack of muscle spasticity secondary to multiple sclerosis.
A 37-year-old man who was previously healthy. The patient presented to the emergency department with persistent vomiting that began three days ago, localized epigastric abdomen discomfort, no temperature or oedema in the lower limbs, confusion, blurring of vision, generalized fatigability, and limited muscle strength following attacks of severe muscle cramps with muscle stiffness.
Renal ultrasound revealed that both kidneys were normal in size, with grade II hyper-echogenicity, no stones, and no backpressure. Serum creatinine was 10.41 mg/dl, BUN 160 mg/dl, potassium 5.5 mg/dl, calcium 7.3 mg/dl, phosphorus 7.9 mg/dl, PTH 413.9 pg/ml, serum albumin 3.5 g/l, and serum bicarb 16 mmol/l after 24 hours of excellent hydration. ANA 5.4 [N. 20], Anti-cardiolipin normal, C3 1.38 normal, C4 0.47 [N. 0.1-0.4 g/l], Anti-dsDNA 9 [N. 20], and c-ANCA-PR3 4.2, p-ANCA-MPO 1.4 [N. 20] were all normal. High blood uric acid was related with low calcium, high phosphorus, and a total creatine kinase level of 13732 U/L [N. 308 U/l]. Renal biopsy was performed, followed by 3 days of pulse methylprednisolone 1000 mg/day. Renal biopsy revealed myoglobin casts, which were verified by immunostaining and were linked to tubular damage. Oligo-clonal bands were positive in the patient's CSF, indicating demyelinated illness (Multiple Sclerosis). Urine output increased daily until it reached >1000 mL/day, and serum creatinine began to fall gradually to 10.49 mg/dl. Serum creatinine was measured again after two weeks and found to be 1.97 mg/dl. Dimethyl fumarate was prescribed to the patient for multiple sclerosis. After three months, serum creatinine was normal at 1.07 mg/dl, BUN was normal at 9 mg/dl, and electrolytes were normal. During the last two years of regular follow-up, the patient's kidney function remained normal.
We present a case of severe acute renal injury linked with rhabdomyolysis caused by severe multiple sclerosis, with a favorable prognosis.