title: [Bilateral chronic subdural haematoma: Analysis of a series of 190 patients].
abstract: OBJECTIVE
  The aim of this study is to analyse the clinical findings and surgical results in a series of patients with bilateral chronic subdural haematoma (BCSDH), and compare the results with a series of patients treated for unilateral chronic subdural haematoma (UCSDH).
  
  
  METHODS
  A retrospective study was performed on 1523 patients diagnosed and surgically treated for chronic subdural haematoma over a period of 30 years. Patients were divided into 2 groups: The study group consisting of 190 patients operated on for a BCSDH and the control group consisting of patients operated on for an UCSDH (1333 cases).
  
  
  RESULTS
  The patient series included 126 males (66.3%) and 64 females (33.7%), with a mean age at diagnosis of 74.8±10.2. The control group consisted of 870 males (65.2%) and 463 women (34.8%), with a mean age of 73.2±12.1. The most common presenting symptoms was cognitive impairment in 63 patients (33.2%) with BCSDH and 416 (29.5%) with UCSDH. Recurrence rates were 9.4% (18 patients) and 5.7% (77 patients) in unilateral and bilateral haematomas, respectively. The mortality was 10 patients (5.2%) with BCSDH and 55(4%) with UCSDH. Factors significantly related to recurrence in the univariate analysis were being male (P=.040), anticoagulant/antiplatelet therapy (P=.032), and poor neurological status at admission (P=.039).
  
  
  CONCLUSIONS
  This study indicates that BCSDH is more frequent in males, and the most common presentation is headache. The most important factors influencing recurrences are being male, intake of anticoagulant-antiaggregant drugs, and worse clinical status at admission.
authors.affiliation: Servicio de Neurocirugía, Hospital Clínico Universitario de Santiago de Compostela, Santiago de Compostela, España; Departamento de Cirugía, Universidad de Santiago de Compostela, Santiago de Compostela, España. Electronic address: miguel.gelabert.gonzalez@sergas.es.
authors.forename: Miguel
authors.initials: M
authors.lastname: Gelabert-González
authors.affiliation: Servicio de Neurocirugía, Hospital Clínico Universitario de Santiago de Compostela, Santiago de Compostela, España; Departamento de Cirugía, Universidad de Santiago de Compostela, Santiago de Compostela, España.
authors.forename: Eduardo
authors.initials: E
authors.lastname: Arán-Echabe
authors.affiliation: Servicio de Neurocirugía, Hospital Clínico Universitario de Santiago de Compostela, Santiago de Compostela, España; Departamento de Cirugía, Universidad de Santiago de Compostela, Santiago de Compostela, España.
authors.forename: Francisco Javier
authors.initials: FJ
authors.lastname: Bandín-Diéguez
authors.affiliation: Servicio de Neurocirugía, Hospital Clínico Universitario de Santiago de Compostela, Santiago de Compostela, España; Departamento de Cirugía, Universidad de Santiago de Compostela, Santiago de Compostela, España.
authors.forename: José María
authors.initials: JM
authors.lastname: Santín-Amo
authors.affiliation: Servicio de Neurocirugía, Hospital Clínico Universitario de Santiago de Compostela, Santiago de Compostela, España; Departamento de Cirugía, Universidad de Santiago de Compostela, Santiago de Compostela, España.
authors.forename: Ramón
authors.initials: R
authors.lastname: Serramito-García
authors.affiliation: Servicio de Neurocirugía, Hospital Clínico Universitario de Santiago de Compostela, Santiago de Compostela, España; Departamento de Cirugía, Universidad de Santiago de Compostela, Santiago de Compostela, España.
authors.forename: Ángel
authors.initials: Á
authors.lastname: Prieto-González
authors.affiliation: Servicio de Neurocirugía, Hospital Clínico Universitario de Santiago de Compostela, Santiago de Compostela, España; Departamento de Cirugía, Universidad de Santiago de Compostela, Santiago de Compostela, España.
authors.forename: Alfredo
authors.initials: A
authors.lastname: García-Allut
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D020200:Hematoma, Subdural, Chronic / Q000473:pathology / Q000601:surgery*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D055815:Young Adult
keywords: Bilateral; Chronic subdural haematoma; Computed tomography; Escala de Markwalder; Hematoma subdural crónico; Markwalder scale; Recidiva; Recurrence; Tomografía computarizada; Unilateral