Kidney Stones MBBS Notes | EduRev

MBBS : Kidney Stones MBBS Notes | EduRev

 Page 3


Approach to the Patient with
Suspected Kidney Stones
Bradley Thomas Oliver
The University of South Carolina
12/14/05
Page 4


Approach to the Patient with
Suspected Kidney Stones
Bradley Thomas Oliver
The University of South Carolina
12/14/05
Overview
• Renal calculi occur in 5-12% of the American population
– bilateral in 10-15% of patients.
• 80% of patients with urolithiasis form calcium stones
– Most are composed of calcium oxalate
– Less often calcium phosphate
• The other main types include:
– uric acid
– struvite (magnesium ammonium phosphate) – cystine stones
Page 5


Approach to the Patient with
Suspected Kidney Stones
Bradley Thomas Oliver
The University of South Carolina
12/14/05
Overview
• Renal calculi occur in 5-12% of the American population
– bilateral in 10-15% of patients.
• 80% of patients with urolithiasis form calcium stones
– Most are composed of calcium oxalate
– Less often calcium phosphate
• The other main types include:
– uric acid
– struvite (magnesium ammonium phosphate) – cystine stones
Overview Cont
• The same patient may have a mixed stone
• Another type limited to HIV patients
– Indinavir-induced stones
– The drug crystalizes and the stones are composed almost completely of
the protease inhibitor.
– Happens in 4% to 22% of patients treated with the standard dose of
indinavir (800mg three times a day) • Stones can cause renal scarring, damage, or even renal failure if
they are bilateral.
• In 10% of patients, stones recur within 1 year. This percentage
increases to 50% within 10 years.
Read More
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