P633 - CORRELATION BETWEEN ENERGY EXPENDITURE ESTIMATED BY WEIGHT-BASED PREDICTIVE EQUATIONS AND MEASURED BY INDIRECT CALORIMETRY IN THAI PATIENTS WITH OBESITY.

Linked sessions

P633

CORRELATION BETWEEN ENERGY EXPENDITURE ESTIMATED BY WEIGHT-BASED PREDICTIVE EQUATIONS AND MEASURED BY INDIRECT CALORIMETRY IN THAI PATIENTS WITH OBESITY.

S. Taepakdee1,*, P. Seehawong1, A. Nimthong2, S. Keawtanom2, P. Pramyothin1,2, K. Chaiyasoot1,2

1Division of Clinical Nutrition, Department of Medicine, Faculty of Medicine Siriraj Hospital, 2Research Center for Nutritional Support, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand

 

Rationale: The incidence of obesity in Thailand has doubled over the past two decades. Estimating caloric requirements in hospitalized patients with obesity is challenging. Indirect calorimetry, the gold standard for measuring resting energy expenditure (REE), is often unavailable, so predictive equations are commonly used. However, their accuracy in Thai inpatients with obesity remains unclear.

Objective: To evaluate the correlation between predictive equations for caloric requirements and REE measured by indirect calorimetry in Thai hospitalized patients with obesity.

Methods: This study, conducted at Siriraj Hospital (July 2022–June 2023), included 82 inpatients (aged 18–65 years, BMI ≥ 25 kg/m²). REE was measured using FITMATE and Q-NRG calorimeters, while caloric needs were estimated using seven predictive equations: NICE, Jeejeebhoy, Harris-Benedict, ESPEN 2018, ASPEN 2016, WHO, and Mifflin-St. Jeor. Agreement between measured and predicted values was assessed using the intra-class correlation coefficient (ICC), concordance correlation coefficient (CCC), and Bland–Altman plots.

Results: The 82 patients (55% men, 45% women) had a mean age of 50.4 ± 10.6 years and BMI of 31.6 ± 6.2 kg/m². The Harris-Benedict equation was the most accurate (ICC = 0.600), followed by Mifflin-St. Jeor (ICC = 0.587) and WHO (ICC = 0.576).

Image:



 

Conclusion: In hospitalized Thai patients with obesity, the Harris-Benedict equation using actual body weight provides the closest approximation to REE measured by indirect calorimetry.

Disclosure of Interest: None declared