title: [Study of the pre and post-synaptic dopaminergic system by DaTSCAN/IBZM SPECT in the differential diagnosis of parkinsonism in 75 patients].
abstract: BACKGROUND
  Essential tremor (ET) may be misdiagnosed as idiopathic Parkinson's disease (PD). In neurodegenerative diseases, structural imaging, such as CT or MRI, is of limited value for differentiating parkinsonian syndromes since structural changes are often only evident by the time the disease is far advanced. Most cases of symptomatic parkinsonism are vascular parkinsonism, but PD may coexist. The differential diagnosis between Alzheimer's disease (AD) and dementia with Lewy bodies (LBD) is often difficult.
  
  
  OBJECTIVE
  To define the utility of functional neuroimaging test to establish differential diagnosis between PD and ET, drug induced parkinsonism, multiple system atrophy and vascular parkinsonism, and between AD and LBD, when clinical presentation, evolution or treatment response are atypical.
  
  
  METHODS
  A group of 75 patients with parkinsonism was examined by clinical assessment and DaTSCAN (123I-FP-CTI, dopamine transporter protein marker) and/or IBZM SPECT (D2 receptor marker). The patients were recruited from our outpatient clinic.
  
  
  RESULTS
  Correlation between initial clinical diagnosis and functional imaging studies (DaTSCAN and/or IBZM SPECT) in our patients did not reach that described (more than 90 %) for these techniques in previously published studies. Conclusions. According to sensitivity and sensibility reported in previous imaging studies of the pre and/or postsynaptic dopaminergic system using DaTSCAN and/ or IBZM, SPECT may be a new tool in the diagnosis of parkinsonian patients with difficult clinical diagnosis.
authors.affiliation: Servicio de Neurología, Complejo Hospitalario de Ciudad Real, Ciudad Real. juliavaamonde@hotmail.com
authors.forename: J
authors.initials: J
authors.lastname: Vaamonde
authors.forename: R
authors.initials: R
authors.lastname: Ibáñez
authors.forename: A M
authors.initials: AM
authors.lastname: García
authors.forename: V
authors.initials: V
authors.lastname: Poblete
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001549:Benzamides; D001921:Brain / Q000378:metabolism* / Q000503:physiopathology; D003342:Corpus Striatum / Q000378:metabolism*; D003937:Diagnosis, Differential; D004298:Dopamine / Q000378:metabolism*; D019706:Excitatory Postsynaptic Potentials / Q000502:physiology*; D005260:Female; D006801:Humans; D007457:Iodine Radioisotopes; D008297:Male; D008875:Middle Aged; D020734:Parkinsonian Disorders / Q000175:diagnosis* / Q000378:metabolism* / Q000503:physiopathology; D017729:Presynaptic Terminals / Q000378:metabolism*; D011759:Pyrrolidines; D015899:Tomography, Emission-Computed, Single-Photon
chemical_list: D001549:Benzamides; D007457:Iodine Radioisotopes; D011759:Pyrrolidines; C055743:3-iodo-2-hydroxy-6-methoxy-N-((1-ethyl-2-pyrrolidinyl)methyl)benzamide; D004298:Dopamine