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Health & Medicine for Senior Citizens

Surgery Patients with Low Body Mass Index Most Likely to Die in 30 Days

Slim patients with 23.1 BMI twice as likely to die in 30 days as obese with 35.3 BMI

Nov. 25, 2011 People in the U.S. are pounded by health advice pointing out the health danger of being too fat. Body Mass Index measurement has become a common way for doctors to warn their patients about obesity. But, a new study published this week, has produced a puzzling result surgery patients with the lowest BMI scores (23.1) were most likely to die within 30 days.

The study published Online First by Archives of Surgery, a JAMA/Archives journal, says researchers found that the percentage of deaths (2.8 percent) among patients with a BMI less than 23.1 was over twice that of the percentage of deaths (1 percent) among obese patients with a BMI of 35.3 or higher

 

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"Recent reports suggest that the prevalence of obesity among U.S. adults has increased more than 100 percent since 1990," the authors write as background information in the article.

"This analysis examines the relationship between obesity (as measured by body mass index [BMI; calculated as weight in kilograms divided by height in meters squared]) and surgical mortality."

Using data from the American College of Surgeons National Surgical Quality Improvement Program, Florence E. Turrentine, Ph.D., R.N., and colleagues with the University of Virginia, Charlottesville, examined the relationship between BMI and 30-day mortality among 189,533 patients who underwent general or vascular surgical procedures at one of 183 sites in either 2005 or 2006.

Of the 189,533 patients included in the analysis, 3,245 (1.7 percent) died within 30 days of surgery. The authors found that the percentage of deaths (2.8 percent) among patients with a BMI less than 23.1 was over twice that of the percentage of deaths (1 percent) among patients with a BMI of 35.3 or higher.

Additionally, patients with a BMI of less than 23.1 had statistically significant increased risk of death, with 40 percent higher odds of death than patients with mid-range BMI (between 26.3 and 29.6).

When examining data by procedure category, the authors also found that patients who underwent exploratory laparotomy had the highest percentage of death (13.9 percent) compared with patients in all other categories of principal surgery, and patients who underwent breast lumpectomy had one of the lowest overall mortality percentages (0.1 percent).

The authors also found a statistically significant interaction between BMI and procedure category, indicating that the association between BMI and mortality was statistically different for patients who underwent these procedures (including colostomy, wound debridement, musculoskeletal system procedures, upper gastrointestinal procedures, colorectal resection, hernia repair, among others) compared with patients who underwent laparoscopy.

"These results indicate that BMI is a significant predictor of mortality within 30 days of surgery, even after adjusting for the contribution to mortality risk made by type of surgery and for a specific patient's overall expected risk of death," the authors conclude.

 

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