Are Predictive Energy Expenditure Equations Accurate in Cirrhosis?

Malnutrition is associated with significant morbidity and mortality in cirrhosis. An accurate nutrition prescription is an essential component of care, often estimated using time-efficient predictive equations. Our aim was to compare resting energy expenditure (REE) estimated using predictive equations (predicted REE, pREE) versus REE measured using gold-standard, indirect calorimetry (IC) (measured REE, mREE). We included full-text English language studies in adults with cirrhosis comparing pREE versus mREE. The mean differences across studies were pooled with RevMan 5.3 software. A total of 17 studies (1883 patients) were analyzed. The pooled cohort was comprised of 65% men with a mean age of 53 +/- 7 years. Only 45% of predictive equations estimated energy requirements to within 90-110% of mREE using IC. Eighty-three percent of predictive equations underestimated and 28% overestimated energy needs by +/- 10%. When pooled, the mean difference between the mREE and pREE was lowest for the Harris-Benedict equation, with an underestimation of 54 (95% CI: 30-137) kcal/d. The pooled analysis was associated with significant heterogeneity (I-2 = 94%). In conclusion, predictive equations calculating REE have limited accuracy in patients with cirrhosis, most commonly underestimating energy requirements and are associated with wide variations in individual comparative data.