title: Reliability of myocardial perfusion gated SPECT for the reproducible evaluation of resting left ventricular functional parameters in long-term follow-up.
abstract: OBJECTIVE
  Perfusion gated single photon emission computed tomography (SPECT) can assess with good reproducibility left ventricular (LV) volumes and ejection fraction (EF). Whether this reproducibility is maintained in long-term follow-up is unknown.
  
  
  METHODS
  We compared LV end-diastolic (ED) and end-systolic (ES) volumes (V) as well as EF calculated using gated SPECT and QGS software in 103 coronary artery disease patients studied twice at > 1-year interval because of standard clinical indications. Patients were divided into two groups: (A) 67 patients without major clinical changes and with stable resting perfusion and (B) 36 with modified clinical status or resting perfusion.
  
  
  RESULTS
  The relationship between gated SPECT 2 EF (=y) and gated SPECT 1 EF (=x) was for group A: y=0.91 x + 5.34, r=0.92, p<0.0001, SEE=4 and for group B: y=0.67 x + 13.6, r=0.63, p<0.0001, SEE=10. The 95% limit of agreement was 8 EF units for group A and 20.6 EF units for group B. For EDV, the 95% limit of agreement was 22 ml for group A and 52 ml for group B. For ESV, the 95% limit of agreement was 13 ml for group A and 44 ml for group B.
  
  
  CONCLUSIONS
  In stable patients with an unmodified resting perfusion pattern the functional parameters derived from perfusion gated SPECT have good reproducibility even after a prolonged time interval. This supports the value of gated SPECT for serial evaluations of LV function.
authors.affiliation: Department of Clinical Physiopathology, University of Florence, Florence, Italy. r.sciagra@dfc.unifi.it
authors.forename: Roberto
authors.initials: R
authors.lastname: Sciagrà
authors.forename: Valentina
authors.initials: V
authors.lastname: Berti
authors.forename: Sabrina
authors.initials: S
authors.lastname: Genovese
authors.forename: Alberto
authors.initials: A
authors.lastname: Pupi
mesh_terms: D055426:Cardiac-Gated Single-Photon Emission Computer-Assisted Tomography / Q000379:methods*; D003324:Coronary Artery Disease / Q000000981:diagnostic imaging / Q000503:physiopathology; D005260:Female; D005500:Follow-Up Studies; D006352:Heart Ventricles / Q000000981:diagnostic imaging / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D055414:Myocardial Perfusion Imaging / Q000379:methods*; D015203:Reproducibility of Results; D012146:Rest; D012189:Retrospective Studies; D012984:Software; D013318:Stroke Volume; D013997:Time Factors; D018487:Ventricular Dysfunction, Left / Q000000981:diagnostic imaging* / Q000503:physiopathology
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