A study in the Journal of Urology notes an increase in complications, including blood infections, with a rise in the use of percutaneous nephrolithotomy, a minimally invasive method for extracting kidney stones. The study reviewed data on more than 80,000 U.S. cases from 1999 to 2009 and found that blood infection increased from 1.2% to 2.4%. Complications may be increasing because more vulnerable patients are being treated with the procedure.

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