R Peces

Hospital Universitario La Paz, Madrid, Madrid, Spain

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Publications (91)352.41 Total impact

  • Nefrologia: publicacion oficial de la Sociedad Espanola Nefrologia 11/2012; 32(6):839-842. · 1.27 Impact Factor
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    ABSTRACT: The oculocerebrorenal syndrome of Lowe (OCRL) is an X-linked disorder. The mutation of the gene OCRL1 localized at Xq26.1, coding for the enzyme phosphatidylinositol (4,5) bisphosphate (PIP2P) 5-phosphatase, is responsible for the phenotypic characteristics of the disease. We report a 22-year-old male with a severe form of OCRL syndrome, diagnosed on the basis of congenital cataracts, severe psychomotor and cognitive deficits, and renal tubular dysfunction without Fanconi syndrome. The patient presented low molecular weight proteinuria, nephrocalcinosis, nephrolithiasis, rickets, and growth retardation and developed progressive renal failure. Genetic analysis showed a novel and de novo deletion of exons 10-13 in the OCRL1 gene.
    International Urology and Nephrology 07/2012; · 1.33 Impact Factor
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    ABSTRACT: Gross haematuria is a common manifestation of autosomal dominant polycystic kidney disease (ADPKD). It can be spontaneous or the result of trauma, renal calculi, tumour, or infection. Spontaneous cyst bleeding is important in this particular group of patients, since it can be prolonged by local activation of fibrinolysis by urokinase. The management of haematuria in ADPKD is usually conservative, including bed rest, blood transfusion, correction of blood disorders, and use of vasopressin and erythropoiesis-stimulating agents. In some patients, the management of gross or life-threatening haematuria may require embolisation and/or nephrectomy. Nonetheless, other methods have been tried to avoid prolonged hospitalisation and nephrectomy and preserve kidney function, such as the use of anti-fibrinolytics. Tranexamic acid was recently suggested as a tool to treat gross haematuria in ADPKD in isolated cases. The aim of this study was to evaluate prospectively the response to tranexamic acid in a group of 8 patients with ADPKD and gross haematuria unresponsive to conventional treatment. Results: The massive bleeding stopped within 2 to 5 days in all patients. The haemoglobin level and renal function subsequently stabilised. There were no side effects or thromboembolic events. In this case series, the largest prospective study so far published and the only one including different degrees of renal function, tranexamic acid is confirmed as a promising tool for treating haematuria due to intracystic bleeding in ADPKD. In summary, tranexamic acid can be used safely in ADPKD patients with chronic renal impairment or preserved renal function to treat severe haematuria poorly responsive to conventional therapy. Tranexamic acid can be administered orally or IV; and dose adjustment for renal impairment is important. Tranexamic acid therapy may preserve renal function in ADPKD directly, by stopping haematuria episodes, or indirectly, by preventing embolisation and/or nephrectomy. The major limitation of this study is the small sample size and the lack of an untreated control group. We suggest a prospective, randomised controlled study to confirm the efficacy of this treatment, its long-term safety, and the optimal dosage. Further larger and multicentre studies are needed to evaluate the cost-benefit ratio and the limits of this therapy in the clinical setting.
    Nefrologia: publicacion oficial de la Sociedad Espanola Nefrologia 02/2012; 32(2):160-5. · 1.27 Impact Factor
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    ABSTRACT: Background: Gross haematuria is a common manifestation of autosomal dominant polycystic kidney disease (ADPKD). It can be spontaneous or can result from trauma, renal calculi, tumour, or infection. Spontaneous cyst bleeding is important to consider in this particular group of patients, since it can be prolonged by local activation of fibrinolysis by urokinase. The management of haematuria in ADPKD is usually conservative, including bed rest, blood transfusion, correction of coagulopathies, and use of DDAVP, and erythropoietin stimulating agents. In some patients, the management of gross or life-threatening haematuria may require embolization and/or nephrectomy. Nonetheless, other modalities have been tried to avoid prolonged hospitalization and nephrectomy and to preserve kidney function. These include the use of anti-fibrinolytics. Tranexamic acid was recently suggested as a tool to treat gross haematuria in ADPKD, in single isolated cases. Objective: The aim of this study was to evaluate prospectively the response to tranexamic acid administration in a group of 8 patients with ADPKD and gross haematuria unresponsive to conventional treatment. Results: The massive bleeding promptly stopped within 2 to 5 days in all patients. The haemoglobin level and renal function subsequently stabilized. There were not side effects including thromboembolic events. In this case series, the largest prospective one study so far published and the only one including different degrees of renal function, tranexamic acid is confirmed as a promising tool for treating haematuria due to intracystic bleeding in ADPKD. Conclusions: In summary, tranexamic acid can be used safely in some ADPKD patients with chronic renal impairment or preserved renal function to treat severe haematuria poorly responsive to conventional therapy. Tranexamic acid can be administered orally or IV; and dose adjustment for renal impairment is important. Tranexamic acid therapy may preserve renal function in ADPKD, directly, by stopping haematuria episodes, or indirectly, by avoidance of embolization and/or nephrectomy. The major limitation of this study is the small sample size and the lack of an untreated control group. We suggest a prospective, randomized controlled study to confirm the efficacy of this treatment, its long-term safety, and the optimal dosage. Further larger and multicenter studies are needed to evaluate the cost-benefit ratio and the limits of this therapy in the clinical setting.
    Nefrologia: publicacion oficial de la Sociedad Espanola Nefrologia 12/2011; 32(2):160-165. · 1.27 Impact Factor
  • Source
    R Peces, E de Sousa, C Peces
    Nefrologia: publicacion oficial de la Sociedad Espanola Nefrologia 11/2011; 31(6):627-9. · 1.27 Impact Factor
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    R Peces, C Peces
    Nefrologia: publicacion oficial de la Sociedad Espanola Nefrologia 03/2011; 31(2):134-6. · 1.27 Impact Factor
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    ABSTRACT: Macroscopic haematuria secondary to renal cyst rupture is a frequent complication in autosomal dominant polycystic kidney disease (ADPKD). Sickle-cell disease is an autosomal recessive haemoglobinopathy that involves a qualitative anomaly of haemoglobin due to substitution of valine for the glutamic acid in the sixth position of 3-globin gene on the short arm of chromosome 11. For the full disease to be manifested, this mutation must be present on both inherited alleles. The severity of the disease is proportional to the quantity of haemoglobin S (Hb S) in the red cells; sickle-cell trait (Hb S <50%) and homozygous sickle-cell disease (Hb S >75%). In sickle-cell disease, the abnormal Hb S loses its rheological characteristics and is responsible of the various systemic manifestations including those of the kidney, such as macroscopic haematuria secondary to papilar necrosis. Despite the generally benign nature of the sickle-cell trait, several potentially serious complications have been described. Metabolic or environmental changes such as hypoxia, acidosis, dehydration, hyperosmolality or hyperthermia may transform silent sickle-cell trait into a syndrome resembling sickle-cell disease with vaso-occlusive crisis due to an accumulation of low deformable red blood cells in the microcirculation originating haematuria from papilar necrosis. On the other hand, it has been demonstrated an earlier onset of end-stage renal disease (ESRD), in blacks with ADPKD and sickle-cell trait when compared with blacks with ADPKD without the trait. We studied 2 african-american families (4 patients) which presented with both ADPKD and sickle-cell trait (Hb S <50%). The diagnosis of sickle-cell trait was confirmed by haemoglobin electrophoresis. The renal volume was measured by magnetic resonance imaging (MRI). The proband subject in family 1 presented frequent haematuria episodes, associated to increase of renal volume, developed very early ESRD and was dialyzed at the age of 39 years. The other 3 patients in family 2 presented different degree of renal function. The presence of sickle haemoglobin should be determined in african-american and west-african patients with ADPKD because it is an important prognostic factor. Coherence of sickle-cell trait may have influence on ADPKD evolution to ESRD and other complications, such as cystic haemorrhages. MRI can identify intracystic haemorrhage and permit renal volume measure.
    Nefrologia: publicacion oficial de la Sociedad Espanola Nefrologia 03/2011; 31(2):162-8. · 1.27 Impact Factor
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    ABSTRACT: We report the case of a 38-year-old male with autosomal-dominant polycystic kidney disease (ADPKD) and concomitant nephrotic syndrome secondary to membranous nephropathy (MN). A 3-month course of prednisone 60 mg daily and losartan 100 mg daily resulted in resistance. Treatment with chlorambucil 0.2 mg/kg daily, low-dose prednisone, plus an angiotensin-converting enzyme inhibitor (ACEI) and an angiotensin II receptor blocker (ARB) for 6 weeks resulted in partial remission of his nephrotic syndrome for a duration of 10 months. After relapse of the nephrotic syndrome, a 13-month course of mycophenolate mofetil (MFM) 2 g daily and low-dose prednisone produced complete remission for 44 months. After a new relapse, a second 24-month course of MFM and low-dose prednisone produced partial to complete remission of proteinuria with preservation of renal function. Thirty-six months after MFM withdrawal, complete remission of nephrotic-range proteinuria was maintained and renal function was preserved. This case supports the idea that renal biopsy is needed for ADPKD patients with nephrotic-range proteinuria in order to exclude coexisting glomerular disease and for appropriate treatment/prevention of renal function deterioration. To the best of our knowledge, this is the first reported case of nephrotic syndrome due to MN in a patient with ADPKD treated with MFM, with remission of proteinuria and preservation of renal function after more than 10 years. Findings in this patient also suggest that MFM might reduce cystic cell proliferation and fibrosis, preventing progressive renal scarring with preservation of renal function.
    The Scientific World Journal 01/2011; 11:1041-7. · 1.73 Impact Factor
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    ABSTRACT: We report the case of a 25-year-old woman who presented with abdominal and flank pain with two successive pregnancies and was diagnosed of giant bilateral renal AMLs and pulmonary LAM associated with TSC in the post-partum of her second pregnancy. This case illustrates that in women with TSC rapid growth from renal AMLs and development of LAM may occur with successive pregnancies. It also stresses the potential for preservation of renal function despite successive bilateral renal surgery of giant AMLs. Moreover, the treatment with a low-dose rapamycin may be an option for LAM treatment. Finally, a low-dose rapamycin may be considered as an adjuvant treatment together to kidney-sparing conservative surgery for renal AMLs.
    The Scientific World Journal 01/2011; 11:2115-23. · 1.73 Impact Factor
  • R. Peces, C. Peces
    Nefrologia: publicacion oficial de la Sociedad Espanola Nefrologia 12/2010; 31(2):134-136. · 1.27 Impact Factor
  • R. Peces, E. de Sousa, C. Peces
    Nefrologia: publicacion oficial de la Sociedad Espanola Nefrologia 12/2010; 31(6):627-629. · 1.27 Impact Factor
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    ABSTRACT: Background: Macroscopic haematuria secondary to renal cyst rupture is a frequent complication in autosomal dominant polycystic kidney disease (ADPKD). Sickle–cell disease is an autosomal recessive haemoglobinopathy that involves a qualitative anomaly of haemoglobin due to substitution of valine for the glutamic acid in the sixth position of 3–globin gene on the short arm of chromosome 11. For the full disease to be manifested, this mutation must be present on both inherited alleles. The severity of the disease is proportional to the quantity of haemoglobin S (Hb S) in the red cells; sickle–cell trait (Hb S <50%) and homozygous sickle–cell disease (Hb S >75%). In sickle–cell disease, the abnormal Hb S loses its rheological characteristics and is responsible of the various systemic manifestations including those of the kidney, such as macroscopic haematuria secondary to papilar necrosis. Despite the generally benign nature of the sickle–cell trait, several potentially serious complications have been described. Metabolic or environmental changes such as hypoxia, acidosis, dehydration, hyperosmolality or hyperthermia may transform silent sickle–cell trait into a syndrome resembling sickle–cell disease with vaso–occlusive crisis due to an accumulation of low deformable red blood cells in the microcirculation originating haematuria from papilar necrosis. On the other hand, it has been demonstrated an earlier onset of end–stage renal disease (ESRD), in blacks with ADPKD and sickle–cell trait when compared with blacks with ADPKD without the trait. Patients and methods: We studied 2 african–american families (4 patients) which presented with both ADPKD and sickle–cell trait (Hb S <50%). The diagnosis of sickle–cell trait was confirmed by haemoglobin electrophoresis. The renal volume was measured by magnetic resonance imaging (MRI). Results: The proband subject in family 1 presented frequent haematuria episodes, associated to increase of renal volume, developed very early ESRD and was dialyzed at the age of 39 years. The other 3 patients in family 2 presented different degree of renal function. Conclusions: The presence of sickle haemoglobin should be determined in african–american and west–african patients with ADPKD because it is an important prognostic factor. Co–herence of sickle–cell trait may have influence on ADPKD evolution to ESRD and other complications, such as cystic haemorrhages. MRI can identify intracystic haemorrhage and permit renal volume measure.
    Nefrologia: publicacion oficial de la Sociedad Espanola Nefrologia 12/2010; 31(2):162-168. · 1.27 Impact Factor
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    ABSTRACT: Tuberous sclerosis complex (TSC) is caused by constitutively activated mammalian target of rapamycin (mTOR) resulting in non-malignant tumours of several organs including renal angiomyolipomas (AMLs). AMLs may originate renal failure, hypertension and spontaneous life-threatening bleeding. Recent reports suggest a possible beneficial role of the mTOR inhibitor rapamycin for TSC. However, safety and efficiency of rapamycin in TSC patients as an anti-proliferative agent are still undefined. A 40-year-old man with sporadic TSC and a history of spontaneous bleeding from his left kidney AMLs received low-dose rapamycin for 12 months, and this was associated with a reduction in bilateral kidney AML volume, stabilization and even improvement of renal function. There was also a reduction of facial angiofibromas, improvement of blood pressure control and absence of AML bleeding over this time period. Brain lesion images remained stable, and no significant rapamycin-associated side effects were noted. To the best of our knowledge, this is the first report of a case of reduction in renal AML volume together with preservation of renal function in a patient with TSC receiving low-dose rapamycin. These data suggest that it could be the result of the anti-angiogenic, anti-fibrotic and anti-proliferative effects of rapamycin.
    Nephrology Dialysis Transplantation 11/2010; 25(11):3787-91. · 3.37 Impact Factor
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    ABSTRACT: We report for the first time a case of acute kidney injury associated with severe gastric distention after a laparoscopic Nissen-Rossetti fundoplication of the stomach for hiatal hernia. An abdominal compartment syndrome secondary to intra-abdominal hypertension was suspected. Naso-gastric tube decompression resulted in immediate resaturation of the diuresis and progressive recovery of renal function.
    International Urology and Nephrology 09/2010; 42(3):831-4. · 1.33 Impact Factor
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    ABSTRACT: A 43-year-old woman with autosomal-dominant polycystic kidney disease (ADPKD) received octreotide for 12 months, and this was associated with a 6.3% reduction in liver volume, an 8% reduction in total kidney volume and stabilization of renal function. There was also a reduction of cyst size in fibrocystic disease of breast. These data suggest that the cyst fluid accumulation in different organs from patients with ADPKD is a dynamic process which can be reversed by octreotide. This is the first report of a case of simultaneous reduction in hepatic, renal and breast cystic volume with preservation of renal function in a patient with ADPKD receiving octreotide.
    International Urology and Nephrology 05/2010; 43(2):565-9. · 1.33 Impact Factor
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    ABSTRACT: We report a case of low-grade B-cell lymphoma of mucosa-associated lymphoid tissue (MALT) involving the left kidney and simultaneous onset of a monoclonal gammopathy IgM kappa. No predisposing local inflammatory condition was identified. Following left nephrectomy, the renal specimen showed the centrocyte like cells and lymphoid cells in the lymphoepithelial lesions were positive for CD20 and CD79α. The neoplastic cells expressed monotypic cytoplasmic IgM kappa. The demonstration of bone marrow cells of B-lineage expressing the same monoclonal protein as the tumor suggested bone marrow involvement, even in the absence of identical morphology. Despite chemotherapy and rituximab treatment, clinical follow-up showed right kidney extension with high-grade transformation, and finally systemic dissemination. This case illustrates that the kidney is among the sites that may be involved by MALT B-cell lymphomas in a primary or secondary fashion, and the need for expanded investigation of the possible dissemination. We review the literature on this unusual extranodal lymphoma.
    Nefrologia: publicacion oficial de la Sociedad Espanola Nefrologia 01/2010; 30(6):681-6. · 1.27 Impact Factor
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    ABSTRACT: Carbamazepine is used in the treatment of epilepsy, and also prescribed in neuralgic pain syndromes, and certain affective disorders. Carbamazepine intoxication with suicide attempt is a relatively common clinical problem that can result in coma, respiratory depression, arrhythmia, hemodynamic instability and death. The drug's relatively high molecular weight, elevated volume of distribution and intense protein-binding render it difficult to extracorporeal removal, but published experience with hemoperfusion or hemodialysis present variable results. We describe a case report involving carbamazepine intoxication who was successfully treated with charcoal hemoperfusion. With this treatment the half-life of carbamazepine was reduced with rapid lowering of carbamazepine levels and clinical improvement. Based on our experience in this patient and a review of previously reported cases, extended charcoal hemoperfusion should be considered for serious carbamazepine intoxication because free as well as bound drug fractions are eliminated via this technique.
    01/2010;
  • [Show abstract] [Hide abstract]
    ABSTRACT: Carbamazepine is used in the treatment of epilepsy, and also prescribed in neuralgic pain syndromes, and certain affective disorders. Carbamazepine intoxication with suicide attempt is a relatively common clinical problem that can result in coma, respiratory depression, arrhythmia, hemodynamic instability and death. The drug's relatively high molecular weight, elevated volume of distribution and intense protein-binding render it difficult to extracorporeal removal, but published experience with hemoperfusion or hemodialysis present variable results. We describe a case report involving carbamazepine intoxication who was successfully treated with charcoal hemoperfusion. With this treatment the half-life of carbamazepine was reduced with rapid lowering of carbamazepine levels and clinical improvement. Based on our experience in this patient and a review of previously reported cases, extended charcoal hemoperfusion should be considered for serious carbamazepine intoxication because free as well as bound drug fractions are eliminated via this technique.
    Nefrologia: publicacion oficial de la Sociedad Espanola Nefrologia 01/2010; 30(1):127-30. · 1.27 Impact Factor
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    ABSTRACT: We report a case of low-grade B-cell lymphoma of mucosa-associated lymphoid tissue (MALT) involving the left kidney and simultaneous onset of a monoclonal gammopathy IgM kappa. No predisposing local inflammatory condition was identified. Following left nephrectomy, the renal specimen showed the centrocyte like cells and lymphoid cells in the lymphoepithelial lesions were positive for CD20 and CD79 alfa. The neoplastic cells expressed monotypic cytoplasmic IgM kappa. The demonstration of bone marrow cells of B-lineage expressing the same monoclonal protein as the tumor suggested bone marrow involvement, even in the absence of identical morphology. Despite chemotherapy and rituximab treatment, clinical follow-up showed right kidney extension with high-grade transformation, and finally systemic dissemination. This case illustrates that the kidney is among the sites that may be involved by MALT B-cell lymphomas in a primary or secondary fashion, and the need for expanded investigation of the possible dissemination. We review the literature on this unusual extranodal lymphoma.
    Nefrologia: publicacion oficial de la Sociedad Espanola Nefrologia 12/2009; 30(6):681-686. · 1.27 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Carbamazepine is used in the treatment of epilepsy, and also prescribed in neuralgic pain syndromes, and certain affective disorders. Carbamazepine intoxication with suicide attempt is a relatively common clinical problem that can result in coma, respiratory depression, arrhythmia, hemodynamic instability and death. The drug's relatively high molecular weight, elevated volume of distribution and intense protein-binding render it difficult to extracorporeal removal, but published experience with hemoperfusion or hemodialysis present variable results. We describe a case report involving carbamazepine intoxication who was successfully treated with charcoal hemoperfusion. With this treatment the half-life of carbamazepine was reduced with rapid lowering of carbamazepine levels and clinical improvement. Based on our experience in this patient and a review of previously reported cases, extended charcoal hemoperfusion should be considered for serious carbamazepine intoxication because free as well as bound drug fractions are eliminated via this technique.
    Nefrologia: publicacion oficial de la Sociedad Espanola Nefrologia 12/2009; 30(1). · 1.27 Impact Factor

Publication Stats

445 Citations
352.41 Total Impact Points

Institutions

  • 2002–2012
    • Hospital Universitario La Paz
      • Servicio de Nefrología
      Madrid, Madrid, Spain
  • 1997–2002
    • Hospital Central de Asturias
      Oviedo, Asturias, Spain
  • 1994
    • Hospital General Universitario de Ciudad Real
      Ciudad Real, Castille-La Mancha, Spain