title: Quantitative dobutamine stress echocardiography for the early detection of cardiac allograft vasculopathy in heart transplant recipients.
abstract: BACKGROUND
  A non-invasive method to detect the presence of cardiac allograft vasculopathy (CAV) remains an important goal in clinical cardiology.
  
  
  OBJECTIVE
  To assess the value of quantitative dobutamine stress echocardiography (DSE) for the early detection of CAV.
  
  
  METHODS
  42 heart transplant recipients underwent DSE with acquisition of both conventional two-dimensional and colour tissue Doppler data. All studies were analysed conventionally and quantitatively using regional deformation parameters-that is, peak systolic longitudinal strain (in(peak sys)), strain rate (SR(peak sys)) and post-systolic strain index. Myocardial segments were classified as normal, mildly abnormal or severely abnormal based on correlative angiographic findings.
  
  
  RESULTS
  At baseline, in(peak sys) was significantly lower in severely abnormal segments than in normal ones. However, at peak stress, in(peak sys) was able to separate three groups of segments. Receiver operating characteristic analysis showed an SR(peak sys) response of <0.5/s to identify patients with CAV with a sensitivity of 88%, specificity of 85% and a negative predictive value of 92%.
  
  
  CONCLUSIONS
  Regional myocardial function is impaired in heart transplant recipients with CAV even when the disease is considered to be non-significant on conventional angiography. Systolic deformation parameters tended to detect the existence of CAV more accurately than conventional visual DSE assessment. Strain rate imaging during stress can therefore safely be used as a non-invasive screening test for detecting CAV in heart transplant recipients.
authors.affiliation: Department of Cardiovascular Diseases, Catholic University of Leuven, Leuven, Belgium.
authors.forename: E
authors.initials: E
authors.lastname: Eroglu
authors.forename: J
authors.initials: J
authors.lastname: D'hooge
authors.forename: G R
authors.initials: GR
authors.lastname: Sutherland
authors.forename: A
authors.initials: A
authors.lastname: Marciniak
authors.forename: D
authors.initials: D
authors.lastname: Thijs
authors.forename: W
authors.initials: W
authors.lastname: Droogne
authors.forename: L
authors.initials: L
authors.lastname: Herbots
authors.forename: J
authors.initials: J
authors.lastname: Van Cleemput
authors.forename: P
authors.initials: P
authors.lastname: Claus
authors.forename: B
authors.initials: B
authors.lastname: Bijnens
authors.forename: J
authors.initials: J
authors.lastname: Vanhaecke
authors.forename: F
authors.initials: F
authors.lastname: Rademakers
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D042241:Early Diagnosis; D025401:Echocardiography, Stress / Q000592:standards*; D005260:Female; D006083:Graft Occlusion, Vascular / Q000000981:diagnostic imaging*; D016027:Heart Transplantation; D006801:Humans; D008297:Male; D008875:Middle Aged; D011475:Prosthesis Failure; D014184:Transplantation, Homologous