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New Method Lets Doctors Identify Which Patients Are at High Risk for Death

April 27, 2007 -- About 200,000 Americans will have weight loss surgery this year, and while most will go on to lead healthier lives, tragically, some patients will die as a result.

Now a new assessment tool developed by a Duke University gastric bypass surgeon should help doctors better identify patients with the lowest and highest risk of death.

Eric DeMaria, MD, and colleagues first proposed the risk assessment system last year, based on their own observations and those of others in the field.

The observations led them to conclude that these five factors are independent predictors of poorer surgical outcome:

Patients with none or one of the risk factors were considered to have a low risk of death from weight loss surgery. Those with two to three factors fell into the medium-risk range, and those with four or five were considered high risk.

In an effort to validate the system, DeMaria and colleagues examined data from 4,433 patients who had weight loss surgeries at three centers.

DeMaria presented findings from the study at the annual meeting of the American Surgical Association in Colorado Springs, Colo.

He reported that surgery-related deaths occurred in eight of the 2,166 patients classified as low risk, 26 of the 2,142 patients in the medium-risk group, and three of the 125 patients classified as high risk.

While high-risk patients made up less than 3% of the total surgical population, they had a sixfold greater risk of death than patients categorized at the lowest risk who had no risk factors.

How Many Die?

It is not clear how many patients who have weight loss surgeries ending up dying from the procedures. A recent government report found death rates immediately following surgery to be 0.19% in 2004 -- down from 0.89% just six years earlier.

But a 2005 study of Medicare recipients who had weight loss surgeries found a 5% risk of death among patients aged 65 and older within 30 days of surgery and a 3.7% risk of death for men.

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