title: Comparison of transesophageal Doppler coronary flow reserve measurements with thallium-201 single-photon emission computed tomography imaging in assessment of left anterior descending artery stenoses.
abstract: OBJECTIVE
  Recent studies demonstrate the feasibility of coronary flow reserve measurements by transesophageal echocardiographic (TEE) Doppler recordings of coronary sinus or left anterior descending (LAD) coronary artery flow velocity for detecting stenoses of the LAD artery. This study compares coronary flow reserve measurements by Doppler TEE with thallium-201 (201Tl) single-photon emission computed tomography (SPECT) in patients with proximal single-vessel LAD stenosis.
  
  
  METHODS
  Nineteen patients with various degrees of LAD stenosis (mean area stenosis 71 +/- 24%; range 24-96%) were studied. Area stenosis by quantitative coronary angiography was < 75% in 7 patients and > 75% in 12 patients. Transesophageal LAD and coronary sinus Doppler measurements were performed at baseline and after intravenous dipyridamole. Coronary flow reserve was calculated as the ratio of hyperemic to baseline average peak velocities. Predefined coronary flow reserve cut-off values of 1.8 for the coronary sinus method and of 2.0 for the LAD method were used for diagnosis of significant LAD stenosis. Results were compared with qualitative 201Tl dipyridamole SPECT.
  
  
  RESULTS
  Overall predictive accuracy for diagnosis of > 75% LAD stenosis was 79% for 201Tl SPECT, 77% for the transesophageal LAD and 79% for the transesophageal coronary sinus technique. Concordant results between 201Tl SPECT and the LAD and coronary sinus Doppler methods were observed in 79% and 71% of patients, respectively.
  
  
  CONCLUSIONS
  Thallium-201 SPECT and transesophageal Doppler assessment of coronary flow reserve have similar accuracy for diagnosing significant proximal LAD stenosis. Therefore, both transesophageal Doppler techniques might constitute another widely available, noninvasive method for assessment of left coronary artery disease, if disease location is proximal.
authors.affiliation: Department od Cardiology, University od Vienna, Wahringer Gurtel 18-20, Vienna, Austria.
authors.forename: M
authors.initials: M
authors.lastname: Zehetgruber
authors.forename: D
authors.initials: D
authors.lastname: Mörtl
authors.forename: G
authors.initials: G
authors.lastname: Porenta
authors.forename: G
authors.initials: G
authors.lastname: Mundigler
authors.forename: G
authors.initials: G
authors.lastname: Christ
authors.forename: R
authors.initials: R
authors.lastname: Lengauer
authors.forename: G
authors.initials: G
authors.lastname: Stix
authors.forename: P
authors.initials: P
authors.lastname: Probst
authors.forename: G
authors.initials: G
authors.lastname: Maurer
authors.forename: H
authors.initials: H
authors.lastname: Sochor
authors.forename: P
authors.initials: P
authors.lastname: Siostrzonek
mesh_terms: D001783:Blood Flow Velocity; D017023:Coronary Angiography; D003327:Coronary Disease / Q000175:diagnosis* / Q000503:physiopathology; D003331:Coronary Vessels / Q000502:physiology*; D015150:Echocardiography, Doppler; D017548:Echocardiography, Transesophageal; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D013794:Thallium Radioisotopes; D015899:Tomography, Emission-Computed, Single-Photon
chemical_list: D013794:Thallium Radioisotopes