title: A phase-contrast MRI study of acute and chronic hydrodynamic alterations after hydrocephalus induced by subarachnoid hemorrhage.
abstract: OBJECTIVE
  To determine acute intracranial hydrodynamic changes after subarachnoid hemorrhage (SAH) via phase-contrast MRI (PC-MRI) analysis of the CSF stroke volume in the aqueduct (SVaq) and the foramen magnum (SVfm).
  
  
  METHODS
  A prospective PC-MRI study was performed on 34 SAH patients in the acute and late phase. Data on CSF flow and hemorrhage site were analyzed according to acute or chronic hydrocephalus (HC).
  
  
  RESULTS
  In the acute phase, CSF analysis was performed for 31 patients, 12 of whom presented HC. All 12 had an abnormal SVaq; those with communicating HC (n = 7) had an elevated SV and those with noncommunicating HC (n = 5) had a nil SV. None of the patients with a normal SVaq (n = 11) developed acute HC. Intraventricular bleeding led to more cases of acute HC (P = .005), which was communicating in 58% of cases. In the chronic phase, CSF analysis was performed for 27 patients, 7 of whom presented HC. None of these 7 patients displayed a depressed SVaq.
  
  
  CONCLUSIONS
  SAH led to changes in cerebrospinal fluid hydrodynamics in the majority of patients. Acute HC was communicating in most cases, even when there was intraventricular bleeding. In the late phase, all chronic HC were communicating and did not display aqueductal stenosis.
authors: Service de Neuroradiologie, Centre Hospitalier Universitaire de Bicêtre, Kremlin Bicêtre Cedex, France. guillaume.saliou@bct.aphp.fr
authors: Guillaume
authors: G
authors: Saliou
authors: Gaelle
authors: G
authors: Paradot
authors: Catherine
authors: C
authors: Gondry
authors: Roger
authors: R
authors: Bouzerar
authors: Pierre
authors: P
authors: Lehmann
authors: Marc Etienne
authors: ME
authors: Meyers
authors: Daniel Le
authors: DL
authors: Gars
authors: Hervé
authors: H
authors: Deramond
authors: Olivier
authors: O
authors: Balédent
mesh_terms: D002535:Cerebral Aqueduct / Q000503:physiopathology; D005260:Female; D006801:Humans; D006849:Hydrocephalus / Q000175:diagnosis* / Q000209:etiology* / Q000503:physiopathology; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D013345:Subarachnoid Hemorrhage / Q000134:cerebrospinal fluid* / Q000150:complications* / Q000000981:diagnostic imaging; D014057:Tomography, X-Ray Computed