A 31-year-old man presents with progressive weakness and fatigue. Vital signs: BP 138/88 mmHg, HR 92/min, RR 16/min, Temp 37°C, SpO2 98%. Laboratory studies reveal normal anion gap metabolic acidosis, serum potassium 3.2 mEq/L, serum glucose 95 mg/dL, urinalysis with glucosuria, phosphaturia, and aminoaciduria. Serum creatinine is normal. There is no proteinuria. Which portion of the nephron is primarily affected?
- A)Proximal tubuleGABARITO
- B)Collecting duct principal cell
- C)Thick ascending limb
- D)Distal convoluted tubule
- E)Macula densa
Explicação
Proximal tubule is correct. Type 2 renal tubular acidosis reflects impaired bicarbonate reabsorption in the proximal tubule. The additional glucosuria, phosphaturia, and aminoaciduria indicate Fanconi syndrome, which is a generalized proximal tubule dysfunctio... Ver explicação completa e trilha adaptativa →