The Effect of Body Mass Index on Patient Outcomes in a Medical ICU

Study objectives To examine the effect of patient body mass index (BMI) on outcome in intensive care. Design In a prospective study, the patients were classified into groups based on the calculated BMI, as follows: BMI Setting The study was conducted in a 9-bed medical ICU of a 650-bed tertiary care hospital. Measurements Height and weight were prospectively recorded for the first ICU admission during a hospital stay. Results Between January 1, 1997, and August 1, 2001, 2,148 of 2,806 patients admitted to the ICU had height and weight recorded. There were no differences in APACHE II score, mortality, ICU LOS, hospital LOS, number receiving ventilation, ventilator-days, average total cost, or average variable cost among the five groups. However, the severely obese patients were more frequently female and younger than those who were overweight and obese (p Conclusion BMI has minimal effects on ICU outcome after patients are admitted to a critical care unit.