Why is this urine bag purple?

And which of the following antibiotics should be prescribed?

An 80-year-old female with a history of diabetes and chronic constipation presents to the emergency department with a purple urine bag. 

She is currently bedridden and uses an indwelling catheter. 

On examination, she is hypotensive and confused. 

Blood cultures are positive for Proteus vulgaris

Based on this patient’s presentation, which of the following antibiotics should be commenced? 

  • Nitrofurantoin
  • Ciprofloxacin
  • Ceftriaxone
  • Piperacillin-tazobactam 

You can check your answer under the image.

 

Purple urine

 

Answer: This patient is presenting with

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