PD1057 - DOES MUSCLE QUANTITY ALONE MATTER? CT-DERIVED MUSCLE QUANTITY AND QUALITY VERSUS BIVA-DERIVED PHASE ANGLE IN RELATION TO LENGTH OF HOSPITAL STAY AFTER GASTRIC CANCER SURGERY

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PD1057

DOES MUSCLE QUANTITY ALONE MATTER? CT-DERIVED MUSCLE QUANTITY AND QUALITY VERSUS BIVA-DERIVED PHASE ANGLE IN RELATION TO LENGTH OF HOSPITAL STAY AFTER GASTRIC CANCER SURGERY

C. Mañas Ortiz1,2,3,4,*, N. Bosch Sierra1, J. Ruiz Berjaga1,3, A. Artero Fullana1,3, A. Jimenez Portilla1,5, C. González Blanco1,3, J. Ávila López1, L. Fernández Salvago1, C. Sánchez Juan1,3

1Nutrition Unit, General University Hospital Consortium of Valencia (CHGUV), 2Nutrition Unit, Ascires Hospital, 3Medicine, University of Valencia, Valencia, 4Nutrition, Open University of Catalonia, Barcelona, 5Endocrinology and Nutrition, IMED Hospital, Valencia, Spain

 

Rationale: The clinical utility of body composition techniques for predicting postoperative outcomes remains unclear. This study compared CT-derived muscle parameters and BIVA-derived phase angle (PhA) in relation to length of hospital stay (LOS) after gastric cancer surgery.

Methods: A cross-sectional study included all adult patients undergoing gastric cancer surgery at a tertiary hospital (March 2025–March 2026). Clinical data and LOS (days) were recorded. Preoperative CT (L3) assessed muscle attenuation (HU) and muscle mass index, and phase angle (PhA) was obtained by BIVA. Associations with LOS were analyzed using Spearman’s correlation and linear regression (p<0.05).

Results: Ten patients were included (60% female; mean age 66.5±10.5 years; LOS 9.0±3.9 days). CT-derived UH was not associated with LOS (ρ=0.006; p=0.987). Similarly, PhA showed a non-significant inverse association (β=−0.541; p=0.107). In contrast, CT-derived muscle mass index was positively associated with LOS (β=0.646; p=0.043), explaining 41.8% of variance (R²=0.418).

Conclusion: CT-derived muscle mass index showed a positive association with length of hospital stay. This finding may reflect the influence of surgical complexity and selection factors rather than a direct detrimental effect of higher muscle mass. In contrast, muscle quality and BIVA-derived phase angle were not associated with LOS. These results suggest that quantitative muscle measures alone may not adequately capture postoperative risk, highlighting the need for integrative approaches to body composition assessment in gastric cancer surgery.

References: Martin L, Birdsell L, Macdonald N, Reiman T, Clandinin MT, McCargar LJ, et al. Cancer cachexia in the age of obesity: skeletal muscle depletion is a powerful prognostic factor, independent of body mass index. J Clin Oncol.2013;31(12):1539–47.

Disclosure of Interest: None declared