Study: Estimates of medical errors are overblown
CHICAGO (AP) Alarming studies suggesting that medical
errors kill close to 100,000 U.S. hospital patients each year probably overestimate
the problem, with the real total perhaps 5,000 to 15,000, researchers say.
In a study in Wednesday's Journal of the American Medical
Association, researchers said the previous studies were flawed because there
was little consensus among the doctors consulted on what constitutes a deadly
error.
Also, the previous studies did not consider whether the
patient would have died even if the error hadn't occurred.
Two years ago, a blistering report by the Institute of
Medicine said that medical mistakes in hospitals kill up to 98,000 hospitalized
Americans a year, and it demanded major changes. The mistakes included prescription
drug errors and misused or malfunctioning equipment.
The numbers drew the attention of government officials
earlier this month the Health and Human Services Department made a series
of recommendations to reduce medical errors and hospitals nationwide
have implemented new protections, such as computer programs to catch errors.
But while improvements are welcome, the number of medical
errors that actually cause death is probably overblown, researchers said.
Dr. Rodney A. Hayward, who led the new study as director
of the VA Center for Practice Management and Outcomes Research in Ann Arbor,
Mich., estimates that between 5,000 and 15,000 deaths annually are due to errors.
But he acknowledged those numbers are rough estimates.
"This is not to suggest that medical errors are unimportant,"
Hayward said. Instead, he said: "The argument is to be careful about what you
implement."
He said he worries that reports about errors will discourage
people from seeking needed treatment, and that hospitals with systems that flag
every error "might cause some to turn the system off because of all the false
positive alerts that are no big deal."
Hayward's study looked at 111 hospital deaths at seven
Veterans Affairs hospitals from 1995 to 1996. Fourteen doctors were assigned
to review the patients' medical records. They reported that 22.7% of deaths
might have been prevented if the patients had received optimal care, and 6%
of the deaths were probably or definitely preventable about the same
as other studies.
But on closer examination, the researchers found that in
almost every case in which one of the consulting doctors said error caused a
death, the opinion was not that of the majority of the reviewers, and often
there was no good evidence to support the finding.
Researchers also found widely varying opinions among the
doctors on whether an error directly led to death, and even on what constituted
an error, said Hayward, a professor of medicine and public health at the University
of Michigan.
The new study estimated that only 0.5% of the patients
would have lived at least three months in good health if the care would have
been optimal.
Dr. Lucian L. Leape of the Harvard School of Public Health,
co-author of the Institute of Medicine report, defended his findings and said
Hayward's conclusions were based on too small of a sample and were derived by
way of "statistical torturing."
He said that some medical professionals have argued that
his study actually underestimated the number of medical errors that caused deaths.
Carmela Coyle, senior vice president for policy for the
American Hospital Association, said the new study is interesting but added:
"It's not about the numbers, but focusing on improving patient safety. This
does not change the immediate task at hand."
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