title: [Cerebral blood flow study using SPECT in patients with memory disorders].
abstract: BACKGROUND
  Global amnesia (AG) is a dysfunction of memory, in which there is a sudden incapacity to remember recent events and assimilate new information. The aetiology is currently under discussion. The main hypotheses under consideration are an ischemic mechanism and an epileptic mechanism.
  
  
  OBJECTIVE
  To study the cerebral blood flow in patients with temporary global amnesia (AGT) or permanent global amnesia (AGP) using functional neuroimaging techniques.
  
  
  METHODS
  Four patients were studied. Two had severe alterations of fixation memory which had been present for months. The other two had a sudden loss of recent memory, although space-person orientation and immediate memory remained normal. In all cases the cerebral blood flow (FSC), was assessed by single photon emission tomography (SPECT), using Tc-HMPAO as the radio tracer.
  
  
  RESULTS
  We describe 4 patients, 2 men and 2 women aged between 42 and 64.2 with AGT and the others with AGP. On SPECT there was temporal hypoperfusion in all 4 patients. In 2 cases there was associated parietal hypoperfusion and in 1 case there was frontal hypoperfusion.
  
  
  CONCLUSIONS
  These findings suggest that AGT and AGP are of vascular origin and that SPECT is a useful diagnostic technique in patients with AG.
authors.affiliation: Sección de Neurologia, Hospital de San Juan, Alicante, España.
authors.forename: E
authors.initials: E
authors.lastname: Valiente
authors.forename: M S
authors.initials: MS
authors.lastname: Botella
authors.forename: R
authors.initials: R
authors.lastname: Martín
authors.forename: J
authors.initials: J
authors.lastname: Serrano
authors.forename: J
authors.initials: J
authors.lastname: Verdú
authors.forename: O
authors.initials: O
authors.lastname: Caballero
mesh_terms: D000328:Adult; D000647:Amnesia / Q000000981:diagnostic imaging* / Q000209:etiology / Q000503:physiopathology; D001921:Brain / Q000000981:diagnostic imaging* / Q000503:physiopathology; D002545:Brain Ischemia / Q000150:complications / Q000000981:diagnostic imaging / Q000503:physiopathology; D002560:Cerebrovascular Circulation; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015899:Tomography, Emission-Computed, Single-Photon
vernacular_title: Estudio de flujo sanguíneo cerebral mediante SPECT en pacientes con trastornos de memoria.