title: [Prevalence of hidden renal failure calculated through formulas on the degree of renal function in hypertense patients over 60 referred to out-patients for blood pressure monitoring].
abstract: OBJECTIVE
  To validate the Cockroft-Gault and the abbreviated Modification of Diet in Renal Disease (MDRD) formulas in a hypertense population aged over 60 and with blood pressure monitored in out-patients. To evaluate the prevalence of various stages of hidden chronic kidney disease in this population.
  
  
  METHODS
  Descriptive study of validation of diagnostic tests.
  
  
  METHODS
  Urban primary care centre.
  
  
  METHODS
  A total of 113 patients over 60 (53.8% female) with hypertension and no history of chronic kidney disease, on whom blood pressure could be monitored in a 24-hour session.
  
  
  METHODS
  Calculation of the glomerular filtration rate. Validity parameters of diagnostic tests.
  
  
  RESULTS
  Renal clearance estimated in the Cockroft-Gault and MDRD equations was similar (77.9 mL/min and 76.9 mL/min, respectively). There was 37.3% prevalence of chronic kidney disease, using the Cockroft-Gault equation; and 27.0%, using the MDRD. The degree of agreement between the two equations was excellent in classifying patients with stage-2 chronic kidney disease (kappa index =0.9) and it was acceptable for stage-3 (kappa index =0.5). In both equations, validity indexes were acceptable for the presence of microalbuminuria as a manifestation of renal damage.
  
  
  CONCLUSIONS
  There is a high prevalence of hidden chronic kidney disease in the hypertense population over 60 years old. Glomerular filtration should be determined systematically in these patients, even when their plasma creatinine figures are normal.
authors.affiliation: Centro de salud Universitario La Paz, Unidad Docente de Medicina Familiar y Comunitaria, Servicio Extremeño de Salud, Badajoz, España.
authors.forename: Gerónimo
authors.initials: G
authors.lastname: Pozuelos Estrada
authors.forename: Luis
authors.initials: L
authors.lastname: Molina Martínez
authors.forename: Juan José
authors.initials: JJ
authors.lastname: Romero Perera
authors.forename: Natalio
authors.initials: N
authors.lastname: Díaz Herrera
authors.forename: Lourdes
authors.initials: L
authors.lastname: Cañón Barroso
authors.forename: Francisco
authors.initials: F
authors.lastname: Buitrago Ramírez
mesh_terms: D000368:Aged; D001795:Blood Pressure Determination; D005260:Female; D005919:Glomerular Filtration Rate; D006801:Humans; D006973:Hypertension / Q000150:complications*; D008297:Male; D008433:Mathematics; D010045:Outpatients; D015995:Prevalence; D012017:Referral and Consultation; D051437:Renal Insufficiency / Q000453:epidemiology* / Q000209:etiology*