title: CT perfusion mapping of hemodynamic disturbances associated to acute spontaneous intracerebral hemorrhage.
abstract: BACKGROUND
  We sought to quantify perfusion changes associated to acute spontaneous intracerebral hemorrhage (SICH) by means of computed tomography perfusion (CTP) imaging.
  
  
  METHODS
  We studied 89 patients with supratentorial SICH at admission CT by using CTP scanning obtained within 24 h after symptom onset. Regional cerebral blood flow (rCBF), cerebral blood volume (rCBV) and mean transit time (rMTT) levels were measured in four different regions of interest manually outlined on CT scan: (1) hemorrhagic core; (2) perihematomal low-density area; (3) 1 cm rim of normal-appearing brain tissue surrounding the perilesional area; and (4) a mirrored area, including the clot and the perihematomal region, located in the non-lesioned contralateral hemisphere.
  
  
  RESULTS
  rCBF, rCBV, and rMTT mean levels showed a centrifugal distribution with a gradual increase from the core to the periphery (p < 0.0001). Perfusion absolute values were indicative of ischemia in hemorrhagic core, oligemia in perihematomal area, and hyperemia in normal-appearing and contralateral areas. Perihematomal rCBF and rCBV mean levels were higher in small (< or = 20 ml) than in large (>20 ml) hematomas (p < 0.01 and p < 0.02, respectively).
  
  
  CONCLUSIONS
  Multi-parametric CTP mapping of acute SICH indicates that perfusion values show a progressive improvement from the core to the periphery. In the first 24 h, perihemorrhagic region was hypoperfused with CTP values which were not suggestive of ischemic penumbra destined to survive but more likely indicative of edema formation. These findings also argue for a potential influence of early amounts of bleeding on perihematomal hemodynamic abnormalities.
authors.affiliation: Neuroradiology Unit, Department of Neuroscience, Azienda Ospedaliera Universitaria, Arcispedale S. Anna, Corso della Giovecca 203, 44100, Ferrara, Italy. henryfai@tin.it
authors.forename: Enrico
authors.initials: E
authors.lastname: Fainardi
authors.forename: Massimo
authors.initials: M
authors.lastname: Borrelli
authors.forename: Andrea
authors.initials: A
authors.lastname: Saletti
authors.forename: Roberta
authors.initials: R
authors.lastname: Schivalocchi
authors.forename: Cristiano
authors.initials: C
authors.lastname: Azzini
authors.forename: Michele
authors.initials: M
authors.lastname: Cavallo
authors.forename: Stefano
authors.initials: S
authors.lastname: Ceruti
authors.forename: Riccardo
authors.initials: R
authors.lastname: Tamarozzi
authors.forename: Arturo
authors.initials: A
authors.lastname: Chieregato
mesh_terms: D000368:Aged; D001783:Blood Flow Velocity / Q000502:physiology; D001810:Blood Volume; D001929:Brain Edema / Q000000981:diagnostic imaging / Q000209:etiology / Q000503:physiopathology; D002543:Cerebral Hemorrhage / Q000150:complications / Q000000981:diagnostic imaging* / Q000503:physiopathology*; D002560:Cerebrovascular Circulation / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D015203:Reproducibility of Results; D014057:Tomography, X-Ray Computed / Q000379:methods*