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Kidney stone surgery: More women, more complications with minimally invasive procedure

DETROIT While the number of people especially women who have a minimally invasive procedure to remove kidney stones has risen in recent years, so has the rate of complications related to the surgery, according to a published study by Henry Ford Hospital.

The research, from Khurshid R. Ghani, M.D., of Henry Ford Hospital's Vattikuti Urology Institute, appears in the current issue of Journal of Urology.

The focus of the investigation was the procedure, percutaneous nephrolithotomy, or PCNL, in which a surgeon removes medium to large kidney stones through a small incision in the back using a hollow scope.

Minimally invasive procedures used for treating a wide range of medical conditions have increased in recent years, and the Henry Ford researchers set out to find how much and to what effect this is true for this specific procedure.

"What we found is that the use of PCNL in this country has increased," Dr. Ghani said, "and more women than men have the procedure.

"We also discovered that while the rate of PCNL-related death is low and has remained so, incidence of blood infection and overall complications has increased."

The population-based study looked at data from the Nationwide Inpatient Sample, a database of inpatient hospital stays used by researchers to find, track and analyze national health care trends. The database catalogs some 8 million cases from more than 1,000 hospitals in 44 states.

It was used in this study to identify patients who underwent PCNL between 1999 and 2009. A weighted sample was then formulated to estimate utilization rates across the country.

In addition, Henry Ford researchers tracked and analyzed trends in patient age; complications before, during and after the procedure; other disorders or diseases that existed at the time of the surgery; and in-hospital deaths.

A total of 80,097 patients over the age of 18 and with a median age of 53 were found to have undergone PCNL during the study period, during which the number of times the procedure was performed climbed by 47 percent.

The results showed:

  • PCNL use rose from 3.0 to 3.63 per 100,000 men, and from 2.99 to 4.07 per 100,000 women during the study period. This represented a 0.03 percent increase in men who underwent the procedure compared to a 2.54 percent increase in women.

  • Co-morbidity, or the presence of other disorders or disease at the time of surgery, increased during the study time-span.

  • At the same time, overall complications increased from 12.2 percent in 1999 to 15.6 percent in 2009.

  • Significantly, the incidence of sepsis or blood infection doubled, rising from 1.2 percent to 2.4 percent.

  • The rate of PCNL-related death remained essentially unchanged at 0 to 0.4 percent.

Dr. Ghani and his associates concluded that patients were at higher risk of developing complications if they were older, sicker and treated in more recent years. And though the rate of deaths associated with the procedure remained statistically flat, those cases that did occur were found with older patients.

"We believe the broad use of this procedure, especially in older and sicker patients, may be the reason for these changes," Dr. Ghani said.

Contact: Dwight Angell
Henry Ford Health System

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