L Pérez Tamajón

Publications (8)8.18 Total impact

• Article: [Induction treatment by combining immunoglobulins, plasmapheresis and rituximab in hypersensitive patients receiving cadaveric renal allograft].

  J M Rufino Hernández, E Cabello Moya, J M González-Posada, D Hernández Marrero, L Pérez Tamajón, D Marrero Miranda, S García Rebollo, B Martín Urcuyo, A Rodríguez Hernández, A Franco Maside, Y Barrios del Pino, R Rodríguez Rodríguez, B Maceira Cruz, A Torres Ramírez, E Salido Ruiz
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  ABSTRACT: In our Universitary Hospital of Canarias we iniciated in May 2008 a induction therapy protocol for sensitized patients receiving cadaveric renal graft using intravenous immunoglobulins, plasmapheresis and rituximab plus immunosuppression with prednisone, tacrolimus and mycophenolate mofetil. We present the results of four patients. Everyone had anti-HLA antibodies rate (PRA by CDC) more than 75%, were on a waiting list during 4 to 17 years and follow-up time was 10-14 months after transplantation. Patient and graft survival in this period was 100%. Only one patient suffered a humoral acute rejection and another one cellular rejection, in both cases reversible with treatment. During the first year, no evidence of de novo donor-specific antibodies was detected. All patients had significantly reduced the CD19+ cells percentage after infusion of rituximab. Neurological symptoms suggestive of progressive multifocal leukoencephalopathy or serious viral infections after transplantation have not been observed. Additionally, no immediate side effects were observed after administration of medication. In summary, induction therapy by combining immunoglobulin, plasmapheresis and rituximab in hypersensitive patients allows the realization of deceased kidney transplantation with good results in the short and medium-term without serious side effects. It remains to know whether this success will continue in the long term.
  Nefrologia: publicacion oficial de la Sociedad Espanola Nefrologia 01/2010; 30(2):252-7. · 1.00 Impact Factor
• Article: [A successful pregnancy in female after simultaneous kidney-pancreas transplantation].

  P Gutiérrez, I Martín-Mederos, L Pérez-Tamajón, M Coloma, A Alarcó, A Bravo, J M González-Posada
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  ABSTRACT: The effects of pregnancy on kidney transplant recipients have been widely described, although its impact on the mother, the fetus and the graft is still debated. Experience in simultaneous kidney-pancreas transplantation is limited, with few reported cases, which increases uncertainty about guidelines to follow in this situation. We describe a case of successful pregnancy in a 35 year-old patient who underwent simultaneous pancreas-kidney transplantation 34 months before delivery. After modifications in immunosuppressive therapy (with tacrolimus and mycophenolate, the latter being switched to azathioprine), pregnancy evolved favourably. Delivery was by caesarean section due to fetal distress at 38 weeks of gestational age. Five months after delivery the child shows normal development while both pancreas and kidney grafts show normal function.
  Nefrologia: publicacion oficial de la Sociedad Espanola Nefrologia 02/2008; 28(2):218-21. · 1.00 Impact Factor
• Article: Successful therapeutic use of rituximab in refractory membranous glomerulonephritis.

  M Cobo, D Hernández, C Rodriguez, L Pérez-Tamajón
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  ABSTRACT: We present the case of a 57-year-old man with nephrotic syndrome secondary to idiopathic membranous glomerulonephritis unsuccessfully treated with angiotensin-converting enzyme inhibitor (ACEI), angiotensin II receptor antagonist (ARA), prednisone and chlorambucil. After treatment with rituximab, we observed a progressive decrease of proteinuria and normalization of serum albumin. 18 months after treatment, he remained in remission. No adverse reactions to rituximab were noted throughout follow-up.
  Clinical nephrology 08/2006; 66(1):54-7. · 1.17 Impact Factor
• Article: Improved cardiovascular risk profile of patients with type 1 diabetes mellitus and renal failure after simultaneous pancreas-kidney transplantation.

  L Pérez Tamajón, D Marrero Miranda, A Caballero Figueroa, D Hernández Marrero, I Laynez Cerdeña, A Bravo Gutiérrez, M Meneses Fernández, A Alarcó Hernández, L Morcillo Herrera, J M González-Posada Delgado
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  ABSTRACT: The prognosis of patients with type 1 diabetes mellitus and chronic renal failure improves after simultaneous pancreas-kidney (SPK) transplantation. Good control of glycemia and other cardiovascular risk factors may positively influence prognosis. The objective of this study was to evaluate changes in cardiovascular risk factors after SKP. We studied 13 patients (aged 36 +/- 8 years, 7 women) before and 12 months after SPK transplantation. All were treated with thymoglobulin, prednisone, tacrolimus, and mycophenolate mofetil. We compared the following pre- and post-SPK parameters: glycemia, HbA(1)c, total cholesterol, HDL, LDL, triglycerides, systolic (sBP), diastolic blood pressure (dBP), and body mass index (BMI). Twelve months after SPK transplantation, glycemia, HbA(1)c and triglycerides significantly decreased (P < .001; P < .001, and P < .002, respectively), as did sBP (P < .002) and dBP (P < .001). No changes were found for BMI or total, HDL and LDL cholesterol values. The number of patients requiring antihypertensive therapy fell (13 versus 3; P < .002), as did the number of drugs (2.3 +/- 0.8 versus 0.4 +/- 0.7; P < .001). The number of patients requiring statins also fell (11 versus 3; P < .002). At 12 months, all patients had normal renal function (creatinine clearance 85 +/- 10 mL/min) and required no insulin; four had microalbuminuria. These interim results show an improved cardiovascular risk profile 12 months after SPK transplantation, which lays the basis for a more favorable long-term prognosis.
  Transplantation Proceedings 11/2005; 37(9):3979-80. · 1.00 Impact Factor
• Article: [Efficacy and safety of two vitamin supplement regimens on homocysteine levels in hemodialysis patients. Prospective, randomized clinical trial].

  J E Sánchez Alvarez, L Pérez Tamajón, D Hernández, A Alvarez González, P Delgado, V Lorenzo
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  ABSTRACT: High levels of homocysteine (tHcy) are frecuent in MHD patients, and recognized as a risk factor for cardiovascular events. Vitamin supplements have been shown to lower serum Hcys, although optimal dose and efficacy is not well defined. Moreover, methylenetetrahydrofolate reductase (MTHFR) gene polymorphism can modulate its prevalence and response to treatment. To evaluate efficacy and safety of two vitamin supplement regimens on Hcys serum levels over a 12 month period. We conducted a prospective, randomised, double-blind trial in 60 stable MHD patients (68 +/- 13 years, 48% male, 50% diabetics). Patients were randomly assigned to one of two treatment regimens: 1) daily renal multivitamin containing folate (FA), vitamin B6 and B12 (5 mg, 10 mg and 0.4 mg respectively) (N = 27); and 2) supraphysiological daily doses (15 mg, 100 mg and 1 mg) (N = 33). These regimens were continued throughout the study period. Hcys levels were compared with a control group from the general population (N = 276) matched for age and gender. Measurements: demographic and clinical data, serum levels of Hcys, FA, B6, B12 at baseline and after 1, 3, 6 and 12 months of treatment; MTHFR gene polymorphism (PCRRT). At baseline, global prevalence of hyperhomocysteinemia (tHcy > or = 15 micromol/L) was 100% in patients and 22% en controls. Hcys levels were significantly higher in patients versus controls (32.4 +/- 8.9 vs 12.9 +/- 6.8; P < 0.0001). Both regimens were equally effective in reducing Hcys levels. As a whole, Hcys levels were reduced by 23.6% (P < 0.001) after one month of treatment. The highest reduction was observed at the sixth month (28.3%, 32.4 +/- 8.9 vs 22.7 +/- 6.4, P < 0.001) and remained stable thereafter. However, only 12% of patients normalised their plasma levels after 12 months of therapy. The effect of treatment was not influenced by age, gender, diabetes, body weight or time on MHD. Reduction rate of tHcy levels was related to baseline tHcy level (r = 0.500, P < 0.001) and baseline FA levels (r = -0.332, P = 0.009). The MTHFR polimorfism did not significantly modified the effect of the treatment. No side effects were associated with either regimen. Hyperhomocysteinemia is common in patients with conventional HD schedules and this is not related to vitamin deficiencies. Vitamin supplements significantly reduce Hcys levels in a sustained but suboptimal way. Supraphysiological doses did not improve the results. Further studies are requiered to demonstrate that this effect is associated with an improval in morbidity and mortality.
  Nefrologia: publicacion oficial de la Sociedad Espanola Nefrologia 02/2005; 25(3):288-96. · 1.00 Impact Factor
• Article: [Improved short-term cardiovascular profile after simultaneous pancreas-kidney transplantation].

  J M González-Posada, L Pérez Tamajón, A Caballero, I Laynez, D Marrero, C Rodríguez, A Bravo, M Meneses, A Alarco, L Morcillo, D Hernández
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  ABSTRACT: The prognosis of type 1 diabetes mellitus (T1DM) patients with chronic renal failure (CRF) improves after simultaneous pancreas-kidney (SPK) transplantation. In order to evaluate the changes in cardio-vascular risk (CVR) factors after SKP, we studied nine recipients before and 6 months after SPK. There were five females and four males, with a mean age of 37 +/- 8 years, duration of diabetes of 24 +/- 5 years, three of them before starting dialysis, and six on dialysis (hemodialysis = 5; peritoneal dialysis = 1). Before SPK, all patients received anti-hypertensive therapy (1-4 drugs; mean 2.2 +/- 0.9) and eight received statins. At 6 months after SPK, all patients were under triple immunosuppressive therapy (steroids + tacrolimus + MMF) without statins. They had normal renal function (Plasma Creatinine = 1.2 +/- 0.3 mg/dl) and pancreatic endocrine function (glycemia = 80 +/- 8 mg/dl). HbA1c decreased significantly (8.4 +/- 1.2 vs 4.7 +/- 0.6%; p < 0.007) with a value > 7% in seven patients before SPK and in none 6 months after SKP transplantation (p < 0.001). Although Body Mass Index increased (23 +/- 2 vs 25 +/- 3 kg/m2; p < 0.05), plasma triglycerides decreased (130 +/- 51 vs 88 +/- 33 mg/dl; p < 0.05), and total cholesterol, LDL-cholesterol and HDL-cholesterol were similar. Systolic and diastolic blood pressure (BP) decreased (156 +/- 7 vs 133 +/- 15; p < 0.01 and 96 +/- 7 vs 79 +/- 9; p < 0.007) with only two patients on anti-hypertensive therapy (1 drug). Likewise, before transplantation all patients were hypertensive (six grade 1 and three grade 2) while this was observed in only two at the end of follow-up (both grade 1) (p < 0.001). In conclusion, SPK transplantation with good renal and pancreatic function is associated with a short-term improvement in CVR profile.
  Nefrologia: publicacion oficial de la Sociedad Espanola Nefrologia 02/2005; 25(3):315-21. · 1.00 Impact Factor
• Article: Immunosuppression with sirolimus, cyclosporyne, and prednisone in renal transplantation.

  J M Gonzalez-Posada, A P Rodriguez, L Pérez-Tamajón, D Hdez-Marrero, B Maceira
  Transplantation Proceedings 03/2002; 34(1):99. · 1.00 Impact Factor
• Article: [Treatment of arterial hypertension in the diabetic patient. From theory to hard reality].

  B Maceira, L Pérez Tamajón, M Losada
  Nefrologia: publicacion oficial de la Sociedad Espanola Nefrologia 02/2001; 21 Suppl 3:39-45. · 1.00 Impact Factor