title: [Perinephric abscess: associated factors and mortality].
abstract: OBJECTIVE
  To determine predisposing factors in perinephric abscesses and to find events associated with unfavourable outcome.
  
  
  METHODS
  We carried out a clinical, descriptive, retrospective and cross-sectional study, including 23 patients diagnosed of perinephric abscess admitted to our hospital.
  
  
  RESULTS
  In patients with perinephric abscess, clinical charts included diabetes mellitus in 65.2%, history of nephrolithiasis in 43.47% and history of urological surgery in 17.38%. On hospital admission, haemoglobin greater than 10.5 g/dL and white blood cell count lower than 15 x 10(3) / microL were associated with nephrectomy, and platelet count lower than 140 x 10(3) / microL with septic shock. General mortality was 8.69%, and 78.3% if patient required nephrectomy. Patients who died had fever, anaemia, white blood cell count greater than 16 x 10(3) / microL, platelet count lower than 130 x 10(3) / microL, and hyponatremia of 125 mEq/L or lower at hospital admittance, and all of them had septic shock and required nephrectomy.
  
  
  CONCLUSIONS
  In our series, a higher percentage of patients had diabetes mellitus and/or nephrolithiasis. Haemoglobin level and white blood cells count were associated with loss of the renal unit, thrombocytopenia was associated with septic shock and hyponatremia with mortality.
authors.affiliation: Servicio de Urología, Hospital de Especialidades Centro Médico Nacional Siglo XXI, México, Distrito Federal, México. urologia_maldonado@yahoo.com.mx
authors.forename: Efraín
authors.initials: E
authors.lastname: Maldonado-Alcaraz
authors.forename: Guillermo
authors.initials: G
authors.lastname: Ixquiac-Pineda
authors.forename: Virgilio
authors.initials: V
authors.lastname: López-Sámano
authors.forename: Eduardo
authors.initials: E
authors.lastname: Serrano-Brambila
mesh_terms: D000328:Adult; D000368:Aged; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D013369:Subphrenic Abscess / Q000209:etiology* / Q000401:mortality*