Determinants of left ventricular mechanical dyssynchrony in patients submitted to myocardial perfusion imaging: A cardiac CZT study.
An interaction between coronary anatomy, myocardial perfusion, and left ventricular (LV) functional parameters in the development of mechanical LV dyssynchrony (LVD) has been suggested. This study examined the correlates of LVD in a large sample size of patients with known or suspected coronary artery disease (CAD) using cadmium-zinc-telluride camera.



Six-hundred and fifty-seven consecutive patients who underwent myocardial perfusion imaging (MPI) and coronary angiography were included. Coronary stenosis >70% was considered significant. LV perfusion and functional parameters were computed from MPI images. The presence of significant LVD was evaluated by phase standard deviation and histogram bandwidth.



415/657 (63%) patients had significant CAD. LVD was present in 247 (38%) patients and was associated with the presence of a higher CAD burden (P < .001), more impaired measures of LV perfusion (P < .001), contractile function (P < .001), and larger LV volumes (P < .001). By multivariate analysis, the LV end-systolic volume index (P < .001) and ischemic burden (P < .001) were the strongest predictors of LVD independent of CAD extent and LV systolic dysfunction.



LVD is frequent in patients undergoing MPI for suspected or known CAD. Its presence is independent of CAD burden and LV systolic dysfunction, but is dependent on the presence of myocardial perfusion abnormalities and LV end-systolic volume.
Fondazione Toscana G. Monasterio, Via Moruzzi 1, 56124, Pisa, Italy.
Alessia
A
Gimelli
University Hospital of Pisa, Pisa, Italy. riccardo.liga@gmail.com.
Riccardo
R
Liga
Fondazione Toscana G. Monasterio, Via Moruzzi 1, 56124, Pisa, Italy.
Assuero
A
Giorgetti
Fondazione Toscana G. Monasterio, Via Moruzzi 1, 56124, Pisa, Italy.
Brunella
B
Favilli
Fondazione Toscana G. Monasterio, Via Moruzzi 1, 56124, Pisa, Italy.
Emilio Maria
EM
Pasanisi
Fondazione Toscana G. Monasterio, Via Moruzzi 1, 56124, Pisa, Italy.|CNR, Institute of Clinical Physiology, Pisa, Italy.
Paolo
P
Marzullo
D000368:Aged; D002104:Cadmium; D015984:Causality; D015897:Comorbidity; D003324:Coronary Artery Disease / Q000000981:diagnostic imaging* / Q000453:epidemiology*; D005080:Exercise Test / Q000706:statistics & numerical data; D005260:Female; D006801:Humans; D007558:Italy / Q000453:epidemiology; D008297:Male; D055414:Myocardial Perfusion Imaging / Q000379:methods / Q000706:statistics & numerical data*; D011877:Radionuclide Imaging / Q000379:methods / Q000706:statistics & numerical data*; D015203:Reproducibility of Results; D012307:Risk Factors; D012680:Sensitivity and Specificity; D013318:Stroke Volume; D013691:Tellurium; D018487:Ventricular Dysfunction, Left / Q000000981:diagnostic imaging* / Q000453:epidemiology*; D015032:Zinc
C474490:CdZnTe; D002104:Cadmium; D015032:Zinc; D013691:Tellurium
Myocardial perfusion imaging; SPECT; cadmium-zinc-telluride; mechanical dyssynchrony; phase analysis