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Background and Aims The renal biopsy (RB) has been performed in the General Hospital of Ciudad Real (HGUCR) since the year 1989. It allows kidney diseases to be diagnosed and treated and pronostics to be made. We will analyse the results of these 30 years as well as the evolution of the various parameters studied. Method Descriptive study of the RB carried out in the HGUCR between 1989 and 2019. Age, sex, clinical syndrome (CS) at the time of the RB, number of glomeruli and histological diagnosis will be analysed. The patients are divided into 3 groups according to age: children (&amp;lt;15), adults (15-65) and the elderly (&amp;gt;65). We will establish three periods of 10 years: period A (1989-1998), period B (1999-2008) and period C (2009-2019). The categorical variables are expressed as percentages and the quantitative variables average ± standard deviation. Statistical analysis with SPSS 25.0. Results 898 RB have been performed, average number of glomeruli 16, 70% of the RB with more than 10 glomeruli. The average age of the patients was 53±19 years old, 58% male. The most frequent CS was acute kidney failure (AKF) (35%), followed by nephrotic syndrome (NS) (30.5%), asymptomatic urinary disorders (19%), chronic kidney disease (11%), nephritic syndrome (3.6%), haematuria (0.7%) and arterial hypertension (0.7%). The most common in children were asymptomatic urinary disorders (50%), in adults NS (34%) and in the elderly AKF (55.5%). The predominant primary glomerulonephritis (GN): IgA nephropathy (IgAN) (15%), followed by membranous nephropathy (MN) (12%) and focal segmental glomerulosclerosis (FSGS) (11%). The most frequent secondary GN: vasculitis (11%) and lupus nephropathy (10%). 164 RB were performed in period A, 370 in period B and 346 in period C. In all three periods the predominant sex was male and the average age increased: 48 years old in A, 51 years old in B and 56 years old in C. Together with the increase in age, the indication of RB changes: NS in the first two periods and AKF in period C. The most frequent pathology in period A: FSGS (17%), IgAN (16%) in period B and IgAN (15%) followed by vasculitis (11%) in period C. Conclusion In the HGUCR the most common biopsied kidney pathology is IgAN, followed by MN. There has been an increase in the age of the patients as well as an increase in AKF and vasculitis. The KB constitutes a highly useful diagnostic test that allows us to establish prognostics and appropriate treatments.

MO295RESULTS OF 30 YEARS OF RENAL BIOPSIES IN THE GENERAL HOSPITAL OF CIUDAD REAL. WHAT HAS CHANGED?