P603 - STUDY OF THE RELATIONSHIP BETWEEN Y-AXIS OF THE RECTUS FEMORIS MEASURED BY ULTRASOUND AND SKELETAL MUSCLE INDEX (SMI) MEASURED BY OPPORTUNISTIC COMPUTED TOMOGRAPHY (CT)IN ONCOLOGICAL SURGICAL PATIENTS.

P603

STUDY OF THE RELATIONSHIP BETWEEN Y-AXIS OF THE RECTUS FEMORIS MEASURED BY ULTRASOUND AND SKELETAL MUSCLE INDEX (SMI) MEASURED BY OPPORTUNISTIC COMPUTED TOMOGRAPHY (CT)IN ONCOLOGICAL SURGICAL PATIENTS.

M. González Boillos^1,*, I. Castro-Vega¹, M. Chiva Martinez¹, P. Abellan-Galiana¹, A. Rizo Gellida¹, A. Bono Velilla¹, G. F. Maldonado Castro², A. A. Merchante-Alfaro¹

¹Endocrinology, Castellón University Hospital , Castellón, ²Endocrinology, Hospital Nuestra Señora del Prado, Talavera de la Reina , Spain

Rationale: The skeletal mass index (SMI), as determined by computed tomography (CT), are the reference methods for assessing muscle mass. An alternative method is to measure the area of the rectus femoris muscle using ultrasonography (US).

Methods: A retrospective cross-sectional observational study was carried out on oncosurgical patients referred to the nutrition consultation of Castellón University Hospital over a four-year period. Malnutrition was diagnosed according to the GLIM criteria, muscle mass was assessed by ultrasound, and skeletal muscle index (SMI) was measured by computed tomography at the third lumbar vertebra (L3). Patients lacking a CT scan or with a CT scan performed more than one month after the ultrasound examination were excluded

Results: The study cohort comprised 43 patients (31 males), with a mean age of 64.7 ± 6.72 years, a mean BMI of 23.7 ± 4.31 kg/m², and a mortality rate of 25.6%. A total of 53 ultrasound evaluations were conducted, with an average Y-axis of 0.92 (0.75-1.20*) cm² and adipose tissue of 0.55 cm [0.1-0.99] *. Additionally, computed tomography (CT) scans were performed to assess skeletal muscle mass (SMM) using the SMI/height method, yielding an average area of 38.4 cm² [31.6- 45.7) All data were expressed as median and interquartile range.
 The Pearson correlation coefficients between US and SMI/height was 0.589 Following the established criteria for low muscle mass for SMI a ROC curve analysis was conducted on US, with a cutoff point for low muscle mass of 1.27cm², AUC 0.850 with sensitivity 80 % and specificity 100%.

Conclusion: The positive correlation between ultrasound and computed tomography (CT) imaging in our sample suggests that ultrasonography may serve as a viable alternative to CT for the detection of low muscle mass. 
There is no conflict of interest

Disclosure of Interest: None declared