A Osuna Ortega

Hospital Universitario Virgen de las Nieves, Granata, Andalusia, Spain

Are you A Osuna Ortega?

Claim your profile

Publications (14)14.03 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: Infectious disease, a complication favored by immunosuppression, is the main cause of 1st-year mortality in solid organ transplantation. In renal transplant recipients (RTRs), urinary tract infection (UTI) is the most common, and the microorganisms that are isolated depend on chronology. We present an observational study comprising 129 RTRs from January 2010 to December 2011 who were followed during the 1st year after transplantation. We analyzed occurrence of infections, predisposing factors, timing, severity, site of infection, and microorganisms. The patients had a total of 424 infectious episodes during the 1st year (3.29 episodes/patient/year). The predominant focus was the urinary tract, with at least 1 episode in 69.8% of patients. Bacteremia was recorded in 25.6% of patients and surgical wound infection in 20.9%. Cytomegalovirus infection or disease was diagnosed in 46.5%. Severe infections occurred in 30.2%. The predominant pathogen was E. coli. There was a significant correlation between hospital stay and the number of infections (P = .000; r = 0.407) and between body mass index and hospital stay (P = .001; r = 0.282). Severe infections were more frequent in diabetics, patients with a double-J stent, and those treated with basiliximab. Patients with cytomegalovirus replication had a higher number of infections (4.1 ± 1.2 vs 2.5 ± 5; P = .000) and significantly higher annual serum creatinine (1.65 ± 5.7 vs 1.31 ± 1.3 mg/dL; P = .003). The prevalence of infections in the 1st year after kidney transplantation is very high, occurring mainly in the early period, in the urinary tract, and due to E. coli. Cytomegalovirus replication is associated with a higher number of infections and higher serum creatinine at 1 year. Body mass index is a predictor of early infection and of bacteremia in the post-transplantation period. Basiliximab induction and having a double-J stent were predictors of severe infections.
    Transplantation Proceedings 12/2013; 45(10):3620-3. · 0.95 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Objective To present the preliminary results of a non-heart beating donor (NHBD) program in a city of under 500,000 inhabitants.DesignA prospective observational study was conducted between 2010 and 2011.SettingVirgen de las Nieves Hospital and metropolitan area of Granada (Spain).PopulationNHBD and brain dead donors (BDD) in the province of Granada during 2010 and 2011.Study variablesCharacteristics of NHBD, out- and in-hospital times, family and legal refusals, preservation methods, and family information procedure. Organs: reasons for organ non-validness, and harvested and transplanted organs. Recipients: hemodialysis sessions and creatinine at discharge. BDD: number of real donors (RD) and of kidney transplants.ResultsAmong the BDD there were 102 RD and 104 kidney transplants were carried out. In asystole, 22 potential donors, 21 eligible donors, 20 RD and 13 used donors were registered. The mean age among the RD was 50 years (range 33-62)(16 males and 4 females). Twenty-one kidney and two liver transplants from NHBD were performed. There were a number of reasons for organ non-validness. The mean number of post-transplantation hemodialysis sessions was 1.4 (range 0-6). The mean hospital stay was 25 days (range 14-41), and the mean creatinine concentration at discharge was 3.4 mg/dl (range 1.5-6.4). There was one family rejection and no legal (court-ruled) rejections. The preservation methods and family information procedure are described.Conclusions The preliminary results support the development of NHBD programs in cities with under 500,000 inhabitants. In 2011, NHBD accounted for 20.19% of the kidney transplants and 19.60% of the global organ donations in the province of Granada.
    Medicina Intensiva 05/2013; 37(4):224–231. · 1.32 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: OBJECTIVE: To present the preliminary results of a non-heart beating donor (NHBD) program in a city of under 500,000 inhabitants. DESIGN: A prospective observational study was conducted between 2010 and 2011. SETTING: Virgen de las Nieves Hospital and metropolitan area of Granada (Spain). POPULATION: NHBD and brain dead donors (BDD) in the province of Granada during 2010 and 2011. STUDY VARIABLES: Characteristics of NHBD, out- and in-hospital times, family and legal refusals, preservation methods, and family information procedure. Organs: reasons for organ non-validness, and harvested and transplanted organs. Recipients: hemodialysis sessions and creatinine at discharge. BDD: number of real donors (RD) and of kidney transplants. RESULTS: Among the BDD there were 102 RD and 104 kidney transplants were carried out. In asystole, 22 potential donors, 21 eligible donors, 20 RD and 13 used donors were registered. The mean age among the RD was 50 years (range 33-62)(16 males and 4 females). Twenty-one kidney and two liver transplants from NHBD were performed. There were a number of reasons for organ non-validness. The mean number of post-transplantation hemodialysis sessions was 1.4 (range 0-6). The mean hospital stay was 25 days (range 14-41), and the mean creatinine concentration at discharge was 3.4mg/dl (range 1.5-6.4). There was one family rejection and no legal (court-ruled) rejections. The preservation methods and family information procedure are described. CONCLUSIONS: The preliminary results support the development of NHBD programs in cities with under 500,000 inhabitants. In 2011, NHBD accounted for 20.19% of the kidney transplants and 19.60% of the global organ donations in the province of Granada.
    Medicina Intensiva 10/2012; · 1.32 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Impaired cardiac structure and function are fundamental components of cardiovascular disease, leading to morbidity, mortality, and graft loss after renal transplantation. The aim of this study was to describe and determine the factors involved in these cardiac abnormalities, paying special attention to the role of glucose metabolism and oxidative stress. We studied 54 long-term, nondiabetic recipients with no valvulopathy who underwent an echocardiographic examination and simultaneous biochemical determinations of lipid profile, hemoglobin A1c (HbA1c), and various oxidative stress parameters: malondialdehyde, superoxide dismutase, total glutathione, and isoprostanes. We calculated the left ventricular mass index (LVMI) and ejection fraction and the peak velocity of early rapid filling to peak velocity of atrial filling (E/A) ratio. Left ventricular hypertrophy (LVH), systolic dysfunction, and diastolic dysfunction (LVDD) were present in 25.9%, 5.6%, and 59.25% of the patients, respectively. The mean blood pressure (MBP) was higher and the hemoglobin lower among patients with LVH, which was related to the age of the patients. We observed a significant negative association of the E/A ratio-used as an index of LVDD-with HbA1c (r = -.448, P = .002) and age (r = -.57, P = .000) and a positive association with the level of total glutathione (r = .322, P = .029). Multiple regression analysis of the E/A ratio showed significance only for HbA1c but not for MBP or LVMI. These results suggested a possible causal influence of subclinical glucose metabolism impairment as detected by HbA1c on the presentation of LVDD via the impaired oxidative stress status, independent of blood pressure control or LVH grade.
    Transplantation Proceedings 12/2008; 40(9):2912-5. · 0.95 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The primary cause of morbidity and mortality in renal transplantation is cardiovascular disease. Increased oxidative stress implies a greater degree of atherogenesis in these patients. N-acetylcysteine (NAC) which has a thiol group that is the source of l-cysteine and reduced glutathione, acts against atherosclerosis via a decrease in apoptosis, vasoconstriction, and endothelial dysfunction. Experimental models have examined the antioxidant effects of NAC during and after ischemia-reperfusion, but few studies have shown an effect in renal transplantation in human beings. In 8 months, we studied the effect of NAC treatment on oxidative stress, lipids, and renal function in 25 patients with stable renal function and no diabetes after transplantation. Data were collected on oxidative parameters: malondialdehyde, glutathione peroxidase, catalase, superoxide dismutase, glutathione reductase, lipid profile, and renal function (creatinine concentration, Cockroft-Gault formula, and Modified Diet in Renal Disease study). There were no significant differences in oxidative profile before and after treatment with NAC. The mean serum high-density lipoprotein cholesterol fraction increased after treatment and showed a significant positive correlation with glutathione peroxidase (r = 0.495). Serum creatinine concentration decreased, and Cockroft-Gault and Modified Diet in Renal Disease study estimates of renal function increased in the treatment period. In conclusion, NAC treatment in patients with stable renal function after transplantation increased high-density lipoprotein cholesterol and antioxidant molecules in relation to glutathione peroxidase, with a positive influence on renal function.
    Transplantation Proceedings 12/2008; 40(9):2897-9. · 0.95 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Chronic renal failure is commonly related to hyponu- trition, affecting approximately on third of patients with advanced renal failure. We carried out a longitudinal study to assess nutritional evolution of 73 patients on a regular hemodialysis program, assessing changes in the anthropometrical parameter body mass index (BMI) and its correspondence to biochemical nutritional para- meters such as total protein (TP) levels and serum albu- min (Alb). Every three months plasma TP and albumin levels were collected and BMI was calculated by the standard formula: post-dialysis weight in kg/height in m2. For classifying by BMI categories, overweight and low weight were defined according to the WHO Expert Committee. Studied patients had a mean age of 53 years, 43 were male and 30 were female patients. BMI in wo- men was lower than that in men (p < 0.001), as well as TP (p < 0.001) and Alb (p < 0.001) levels. Mean BMI was 29.3 kg/m2. Three point two percent of the determina- tions showed low weight, 12.16% overweight, and 83.97% normal BMI. TP were normal in 90.76% and decreased in 9.24%. Alb was normal in 82.2% and low in 17.78%. After the follow-up time (21.6 months, mini- mum 18 months, maximum 53 months), the Kruskal- Wallis test did not show a statistically significant change for BMI but it did show a change for the biochemical pa- rameters albumin and total proteins (p < 0.05): nutritio- nal impairment in CRF patients is manifested on bioche- mical parameters (TP and Alb) with no reflection on anthropometrical data. (Nutr Hosp. 2006;21:155-62)
    01/2006;
  • [Show abstract] [Hide abstract]
    ABSTRACT: Chronic renal failure is commonly related to hyponutrition, affecting approximately on third of patients with advanced renal failure. We carried out a longitudinal study to assess nutritional evolution of 73 patients on a regular hemodialysis program, assessing changes in the anthropometrical parameter body mass index (BMI) and its correspondence to biochemical nutritional parameters such as total protein (TP) levels and serum albumin (Alb). Every three months plasma TP and albumin levels were collected and BMI was calculated by the standard formula: post-dialysis weight in kg/height in m2. For classifying by BMI categories, overweight and low weight were defined according to the WHO Expert Committee. Studied patients had a mean age of 53 years, 43 were male and 30 were female patients. BMI in women was lower than that in men (p < 0.001), as well as TP (p < 0.001) and Alb (p < 0.001) levels. Mean BMI was 29.3 kg/m2. Three point two percent of the determinations showed low weight, 12.16% overweight, and 83.97% normal BMI. TP were normal in 90.76% and decreased in 9.24%. Alb was normal in 82.2% and low in 17.78%. After the follow-up time (21.6 months, minimum 18 months, maximum 53 months), the Kruskal-Wallis test did not show a statistically significant change for BMI but it did show a change for the biochemical parameters albumin and total proteins (p < 0.05): nutritional impairment in CRF patients is manifested on biochemical parameters (TP and Alb) with no reflection on anthropometrical data.
    Nutricion hospitalaria: organo oficial de la Sociedad Espanola de Nutricion Parenteral y Enteral 01/2006; 21(2):155-62. · 1.31 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Patients with unilateral nephrectomy maintain the remaining kidney function over time, as it has been described in healthy kidney donors. We performed a cross-sectional study of 53 patients who were followed 5 or more years after nephrectomy. Serum creatinine, BUN, Glomerular Filtration Rate (GFR) (24 hours urine collection and Cockcroft formula), microalbuminuria, proteinuria, Body Mass Index and the annual loss rate of renal function were measured or calculated over the follow-up period. We retrospectively considered the presence of risk factors like diabetes, hypertension, microalbuminuria, dyslipemia, smoking habit, obesity and ACE inhibitors or angiotensin-receptor antagonists treatment. We divided our patients into two groups: group I (normal or mild renal failure: GFR > 50 cc/min and or serum creatinine < 1.4 mg/dL) and group II (moderate or severe renal failure). The main cause of nephrectomy was renal tuberculosis, followed by lithiasis and pyonephrosis. In addition, 7.5% of patients were kidney donors. At the time of study, 22.7% had diabetes, 60.4% hypertension and 39.6% were obese. The mean age was 60 years (37 years at the moment of nephrectomy). The GFR final mean was 53.6 cc/min (58.8 cc/min by Cockcroft formula). The mean renal function loss rate was 1 cc/min/year. 35% of the patients had moderate or severe kidney failure and were included in group II; 32% had proteinuria and 56.6% had abnormal microalbuminuria. The univariate risk factors analysis for the development of renal failure showed inter-group statistical significative differences in current age, nephrectomy age, microalbuminuria, proteinuria, and hypertension prevalence (p = 0.008). With regard to the progression rate, we found a significant correlation with final microalbuminuria (r = 0.358, p = 0.03). Current age and final proteinuria were found to be significant risk factors in the multivariate analysis. A high prevalence of renal insufficiency was found among patients with unilateral nephrectomy, which is mainly related to age and proteinuria. The renal function loss rate is slow and is influenced by microalbuminuria.
    Medicina Clínica 06/2005; 125(3):81-3. · 1.40 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Background and objective Patients with unilateral nephrectomy maintain the remaining kidney function over time, as it has been described in healthy kidney donors. Patients and method We performed a cross-sectional study of 53 patients who were followed 5 or more years after nephrectomy. Serum creatinine, BUN, Glomerular Filtration Rate (GFR) (24 hours urine collection and Cockcroft formula), microalbuminuria, proteinuria, Body Mass Index and the annual loss rate of renal function were measured or calculated over the follow-up period. We retrospectively considered the presence of risk factors like diabetes, hypertension, microalbuminuria, dyslipemia, smoking habit, obesity and ACE inhibitors or angiotensin-receptor antagonists treatment. We divided our patients into two groups: group I (normal or mild renal failure: GFR > 50 cc/min and or serum creatinine < 1.4 mg/dL) and group II (moderate or severe renal failure). Results The main cause of nephrectomy was renal tuberculosis, followed by lithiasis and pyonephrosis. In addition, 7.5% of patients were kidney donors. At the time of study, 22.7% had diabetes, 60.4% hypertension and 39.6% were obese. The mean age was 60 years (37 years at the moment of nephrectomy). The GFR final mean was 53.6 cc/min (58.8 cc/min by Cockcroft formula). The mean renal function loss rate was 1 cc/min/year. 35% of the patients had moderate or severe kidney failure and were included in group II; 32% had proteinuria and 56.6% had abnormal microalbuminuria. The univariate risk factors analysis for the development of renal failure showed inter-group statistical significative differences in current age, nephrectomy age, microalbuminuria, proteinuria, and hypertension prevalence (p = 0.008). With regard to the progression rate, we found a significant correlation with final microalbuminuria (r = 0.358, p = 0.03). Current age and final proteinuria were found to be significant risk factors in the multivariate analysis. Conclusions A high prevalence of renal insufficiency was found among patients with unilateral nephrectomy, which is mainly related to age and proteinuria. The renal function loss rate is slow and is influenced by microalbuminuria.
    Medicina Clinica - MED CLIN. 01/2005; 125(3):81-83.
  • [Show abstract] [Hide abstract]
    ABSTRACT: Young age and hepatitis C virus infection (HCVI) are believed to be risk factors in kidney transplantation recipients. The first group is treated empirically with an intensive immunosuppressive regimen, because it is considered to have high immune alloreactivity. The other cohort usually receives a less intensive regimen to avoid excessive immunosuppressive effects. Our aim was to investigate the influence of age, sex, and HCVI on immune status in stable kidney transplant recipients through measurement of peripheral blood lymphocyte subsets. Absolute CD3+, CD3+, CD4+, CD3+, CD8+, CD19+, CD16+ CD3- lymphocyte counts and CD4/CD8 ratios were assessed at five time points in 65 stable kidney allograft patients over 12 months. The subsets were compared according to age, sex, and HCVI of the recipients. An inverse association was observed between recipient age and absolute CD19+ and CD3+ CD4+ lymphocyte counts, which was significant at all time points with respect to CD19+ counts, and at three time points with respect to CD3+ CD4+ counts. A significant positive association was observed between recipient age and absolute CD3- CD16+ lymphocyte counts at three time points. Female recipients showed significantly lower CD3+ CD8+ counts and significantly higher CD4/CD8 ratios than male recipients at four time points. HCVI recipients showed significantly lower CD16+ CD3- counts at four time points. We observed links between immune status and age, sex and HCVI in stable kidney transplant recipients that could offer new insights into recommendations for maintenance immunosuppression.
    Transplantation Proceedings 01/2004; 35(8):2905-7. · 0.95 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: There is growing evidence of the effects of immunosuppressive agents on "immune targets" in renal transplantation. Immunological monitoring could indirectly measure the suppressive effect of these drugs and guide early preventive interventions in transplant recipients. Due to the selective antiproliferative effect of mycophenolate mofetil (MMF) on lymphocytes, our goal was to determine whether MMF modulates peripheral blood lymphocyte subsets (PBLS) in kidney allograft patients. We assessed absolute CD3(+), CD3(+)CD4(+), CD3(+)CD8(+), CD19(+), CD16(+)CD3(-) PBLS counts and CD4/CD8 ratios for 12 months in three groups of kidney allograft patients stratified according to maintenance immunosuppressive regimen: group A (n = 31), which started MMF with prednisone (P) + cyclosporine A (CyA), and two control groups, B (n = 19) and C (n = 15) on P + CyA + azathioprine (Aza) and P + CyA regimens, respectively. We compared intra- and intergroup lymphocyte counts and ratios. Intergroup comparisons showed a significant reduction in all PBLS in group A (CD19(+) from 3 months and other subsets from 6 months), whereas there were no significant changes in PBLS in the other group analyses or comparisons. Our findings suggest that (1) MMF modulates all PBLS in kidney allograft patients, causing a progressive reduction occurring earlier in CD19(+), and (2) we can rule out that these changes were caused by the "natural immunological evolution" of the transplantation. These results could offer a new method for immunological monitoring of transplant patients.
    Transplantation Proceedings 07/2003; 35(4):1355-9. · 0.95 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The evaluation of the nutritional state of patients on maintenance haemodialysis is one of the main aspects involved in the prescription of treatment, since malnutrition is frequent among these patients and is a very important risk factor. We studied the albumin levels and the levels of several rapid interchange proteins (prealbumin, transferrin, cholinesterase) in 106 patients with chronic renal failure on haemodialysis. The proteic catabolism rate (pcr) and total dose on normalized dialysis (KT/V) was also determined in these patients, in accordance with the kinetic urea model. Anthropometrical measurements were taken (dry weight following haemodialysis, skin fold of the triceps and muscular circumference of the arm) in 65 patients. The average levels of the proteins studied were within normal laboratory limits, except for albumin, which was slightly lower. The greater frequency of infranormal levels corresponded to albumin (57%); the protein least altered was prealbumin (14.7%), although 70.4% of patients showed lower levels of this protein compared to those considered as indicating a poor prognosis (30 mg/day). The estimated daily proteic intake, according to the proteic catabolism rate, was lower than the recommended rate in 58% of our patients, this was not correlated with any of the proteins studied, and was significantly lower in the group of patients whose dialysis dose was too low. Although the anthropomorphic parameters did not correlate with any protein, the average levels of prealbumin were significantly lower in patients with infranormal levels of dry weight and skin fold of the triceps. The albumin, prealbumin, transferrin and cholineserase levels were not affected by treatment with erithropoyetin, haemodialysis buffer bath or type of membrane used.
    Nutricion hospitalaria: organo oficial de la Sociedad Espanola de Nutricion Parenteral y Enteral 01/1992; 7(1):52-7. · 1.31 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Hemodialysis patients present an increase in plasma homocysteine (Hcy) due to methylation impairment caused by uremia and the deficiency of the co-factors needed (vitamin B, folic acid). This correlates with a more common development of premature vascular disease. There is no consensus on the therapy, with a poor response to oral administration of conventional doses of folic acid. In this work, we assessed the response of hyperhomocysteinemia in 73 regular hemodialysis patients after the administration of 50 mg of parenteral folinic acid for 18 months. Plasma homocysteine of the patients at the time of the study beginning presented mean values of 22.67 (micromol/L). During the first year of supplementation the mean value was kept at 20 micromol/L. From the first year to the end of the 18-months observation period the mean homocysteine levels were 19.58 micromol/L. Although we found a clear trend towards a decrease in plasma homocysteine levels during the treatment period, there were no significant differences. Homocysteine levels did not come back to normal in none of the patients treated.
    Nutricion hospitalaria: organo oficial de la Sociedad Espanola de Nutricion Parenteral y Enteral 23(3):268-76. · 1.31 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Current high survival in hemodialysis patients (52% at 5 years) have made the chronic manifestations to emerge such as the high hyponutrition prevalence of these patients, as well as the importance of the nutritional status in their morbimortality. The reason for protein-caloric hyponutrition is multifactorial, although chronic inflammatory conditions associated to the dialysis technique are becoming more and more relevant. The variations in several nutritional biochemical parameters (total proteins, plasma albumin, transferrin, and total cholesterol) have been assessed in 73 hemodialysis patients for one year. The mean age of the patients was 53.3 +/- 18.69 years (43 males and 30 females). The average on hemodialysis program was 43 +/- 33 months, with a mean session duration of 246 +/- 24 minutes, and mean hemodialysis dose administered of 1.37 +/- 0.27 (KT/V) (second generation Daurgidas). A decrease in all the biochemical parameters assessed has been observed, with statistically significant differences: total proteins (p < 0.001), albumin (p < 0.00001), total cholesterol (p < 0.05), and transferrin (p < 0.01). The evolution of the nutritional biochemical parameters assessed showed an important nutritional deterioration of the patients remaining stable with the therapy.
    Nutricion hospitalaria: organo oficial de la Sociedad Espanola de Nutricion Parenteral y Enteral 23(2):119-25. · 1.31 Impact Factor