The nurse is caring for a school aged child with glomerulonephritis. Which of the following findings requires IMMEDIATE attention?

A. Decreased urine output and dark brown urine are concerning but not immediately life-threatening. B. Lethargy, confusion, headache, and double vision are signs of severe hypertension and possibly hypertensive encephalopathy, which require immediate attention. C. Elevated BUN, creatinine, and ESR are indicative of kidney dysfunction but are not as immediately concerning as neurological symptoms. D. While elevated BP and irritability are concerning, they are not as immediately critical as the neurological symptoms in option B.