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Background and Aims Changes on body composition have an impact on the survival of haemodialysis (HD) patients. The aim of the study was to determine the impact of the reduction of physical activity due to COVID19 lockdown on body composition in HD patients. Method Retrospective and observational study including 149 HD patients. Nutritional and Bioimpedance spectroscopy (BIS) data were recorded before and after COVID19 lockdown (mean of 148 ± 20 days between determinations). Results Over the 49 days of COVID19 lockdown, we observed a decrease in normohydrated weight (NHW) of 1.01 ± 3.59 kg mainly secondary to a reduction on total body water (TBW) 0.95 ± 3.78 L (extracellular water 0.45 ± 1.58 L and intracellular water 0.41 ± 2.36 L). There was also a small loss on lean tissue index (LTI) of 0.28 ± 2.42 kg/m2, with an increase of fat tissue index (FTI) 0f 0.02 ± 2.82 kg/m2. Twenty-three patients presented COVID19 infection, of which 21 required admission (median of 10 [4-16] days). Patients who presented COVID19 were older (70.7 ± 12.0 vs 64.9 ± 16.6 years, NS) with higher Charlson index (7.48 ± 2.77 vs 6.33 ± 2.65, p = 0.07). Patients with COVID19 infection presented a greater loss on LTI (-1.18 ± 3.15 bs -0.16 ± 2.30 kg/m2; p = 0.22), FTI (-0.41 ± 3.38 vs 0.06 ± 2.74 kg/m2; p = 0.54); BMI (-1.49 ± 2.14 vs -0.25 ± 0.96 kg/m2; p = &amp;lt; 0.01) and NHW (-4.00 ± 6.33 vs -0.62 ± 2.90 kg; p = &amp;lt; 0.01) compared to patients without COVID19 infection. The length of hospitalization was associated with greater loss of BMI and NHW, resulting, therefore, in overhydration. There also had lower serum phosphorus (3.6 ± 0.8 vs 5.2 ± 0.8 mg/dl; p = 0.01) and serum albumin (3.5 ± 0.4 vs 4.0 ± 0.1 g/dl; p = 0.01). Seven patients died during hospitalization. Deceased patients were older (78.4 ± 6.6 vs 67.4 ± 12.4 years; p = 0.01), presented higher comorbidity (estimated by Charlson index 10.0 [8.0-11.0] vs 6.5 [4.3-8.0]; p = 0.02) and were more overhydrated (3.4 ± 3.6 vs 1.9 ± 1.9; p = 0.34). Although not statistically different, they had lower LTI (10.4 ± 2.1 vs 12.0 ± 3.4 kg/m2; p = 0.18) and lower serum albumin (3.4 ± 0.6 vs 3.9 ± 0.4 g/dl; p = 0.08) compared to survivors. Patients who survived COVID19 infection had longer hospitalization (57% were discharged between twelfth and forty third day; mean hospitalization 14.6 ± 11.5 days). Deceased patients died within the first 12 days of hospitalization (6.8 ± 4.1 days). Conclusion COVID19 lockdown induced a weight reduction on HD patients due to decrease in total body water. COVID19 infection increased this reduction, inducing greater loss on lean and fat tissue composition. Moreover, COVID19 impact on body composition was magnified with the length of hospitalization.

MO910CHANGE IN BODY COMPOSITION MEASURED BY BIOIMPEDANCE SPECTROSCOPY AFTER COVID19 LOCKDOWN IN HAEMODIALYSIS PATIENTS