Low Glucose Levels May Raise Death Risk Among Older
MONDAY, April 18 (HealthDay News) -- New research finds that
older diabetics with better control of their blood sugar face less
chance of such diabetes-related complications as heart attacks,
amputation and kidney disease.
However, there's a twist: Those with the
lowest blood sugar levels face a slightly higher chance of
dying than do those whose blood sugar control is in a more normal
Researchers tracked more than 70,000 people with type 2 diabetes
for four years. All were older than 60. "We saw increased mortality
and complications, as anticipated, among those with very high blood
sugars, but we also saw a modestly increased risk of death among
those with very low levels of blood sugar," Dr. Elbert Huang, an
associate professor of medicine at the University of Chicago and
the study's co-lead author, said in a news release from the
People did the best if they had intermediate control of their
blood sugar, the study found.
Guidelines typically recommend that those with diabetes keep
their glucose levels low with a hemoglobin A1C level of less than 7
percent. "We need more evidence regarding how well the 7 percent
guideline, which was based on a 1998 British trial that excluded
older patients, applies to patients over the age of 60," Andrew J.
Karter of the Kaiser Permanente Division of Research, who led the
study along with Huang, said in the news release.
A 2008 study found that older people with diabetes were more
likely to die if they took treatments geared toward intensively
lowering their glucose levels.
"In our study, we found the best overall outcomes among those with the intermediate levels of control, those with A1Cs below 8 percent but above 6 percent," Huang said. "We observed similar patterns for those in their 60s, 70s and over 80."
Why might lower levels be linked to risk for death? "We cannot
say whether this unexpected finding is due to the very low blood
sugar itself, the treatments used to control blood sugars or to
some other factors not directly related to the care of diabetes,"
Karter said. "It may be that the sickest patients at high risk of
dying simply had low blood sugars to start with, rather than
anything directly associated with the care of diabetes increasing
the risk of death."
The study is published in the June issue of
The U.S. National Institute of Diabetes and Digestive and Kidney
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