In some people, overuse of some analgesics can lead to kidney damage

WINSTON-SALEM, N.C. Overuse of some analgesics may lead to irreversible kidney damage in susceptible people, according to one conclusion of a national study being reported today (Nov. 14) at the American Society of Nephrology annual meeting in San Diego.

Vardaman Buckalew, M.D., a nephrologist at Wake Forest University Baptist Medical Center and a coauthor, said that heavy use of aspirin or acetaminophen is associated with a recently discovered condition known as SICK (Small, Indented and Calcified Kidneys). SICK is detected by CT scan of the kidneys of people with irreversible kidney failure.

"We conclude that heavy use of analgesics at least nine years prior to the development of ESRD [irreversible kidney failure] is associated with the anatomic changes of SICK," reported the eight-member research team of the National Analgesic Nephropathy Study.

Of those patients with SICK, 33 percent had overused analgesics preceding the start of dialysis, Buckalew said. "We're not sure why the other people got SICK."

Overall, 7 percent of the 222 dialysis patients in the National Analgesic Nephropathy Study were found to have SICK.

The study tested whether CT scans could be used as a diagnostic tool to find patients who overused analgesics. The CT scans missed 14 heavy users, and falsely identified 10 patients as heavy users who did not use analgesics heavily.

The research team concluded, "The CT scan is not a sensitive test for the identification of heavy analgesic use among [irreversible kidney failure] patients in the American population."

Buckalew said, however, "If a patient does have SICK, there is an increased likelihood of analgesic abuse."

Buckalew said that may indicate that some people are more susceptible to developing

SICK from heavy analgesic use -- defined as .3 of a kilogram (300 grams) per year. That works out to be about two doses of full-strength aspirin or extra strength acetaminophen every day for a yea

Contact: Robert Conn
Wake Forest University Baptist Medical Center

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