A 47-year-old woman with recurrent urinary tract infections presents with persistent bilateral flank discomfort. Vital signs: BP 142/88 mmHg, HR 88/min, RR 16/min, Temp 37.2°C, SpO2 98% on room air. CT abdomen shows a large branching staghorn calculus in the right renal pelvis. Urinalysis reveals alkaline urine (pH 8.2) and positive nitrites. Serum creatinine is 1.8 mg/dL. No hematuria on urinalysis. Which organism type most likely contributed to stone formation?
- A)Encapsulated gram positive cocci
- B)Urease positive bacteriaGABARITO
- C)Anaerobic gram negative rods
- D)Acid fast bacilli
- E)Spirochetes
Explicação
Urease positive bacteria are correct. Struvite stones are magnesium ammonium phosphate stones that form in alkaline urine due to urease producing organisms such as Proteus, Klebsiella, and some Staphylococcus species. They can grow into large staghorn calculi. Ver explicação completa e trilha adaptativa →