Impaired tissue Doppler diastolic function in patients with coronary artery disease: relationship to endothelial damage/dysfunction and platelet activation.
BACKGROUND
Pulsed tissue Doppler imaging (TDI) allows direct measurement of systolic and diastolic function of the left ventricle. In patients with coronary artery disease (CAD), myocardial ischemia-related impaired diastolic function may be linked to systemic endothelial damage/dysfunction and increased thrombogenesis. We hypothesized relationships between TDI-defined diastolic dysfunction and plasma von Willebrand factor (vWf, marking endothelial damage/dysfunction), soluble P-selectin (sP-sel, reflecting platelet activation), fibrin D dimer (an index of fibrin turnover and thrombogenesis), fibrinogen, and plasma viscosity (PV) in CAD.


METHODS
Conventional 2-dimensional Doppler echocardiography and TDI were performed in 75 stable CAD patients (55 men, 59 +/- 11 years) and 40 age- and sex-matched healthy controls. Peak systolic (Sm), peak early (Em), and late (Am) diastolic mitral annular velocities measured at 4 sites (septal, lateral, inferior, and anterior) were averaged as global systolic and diastolic left ventricular function, respectively. The mean TDI velocities were dichotomized into low and high (below/above median) groups. Plasma vWf, sP-sel, D dimer (enzyme-linked immunosorbent assay), fibrinogen (modified Clauss), and PV levels were measured.


RESULTS
CAD patients had significantly lower Sm, Em, Em/Am ratio, and a higher ratio of early transmitral flow E-velocity over Em (E/Em) when compared with controls (all P < .05). On multivariate analysis, adjusted for age, ejection fraction, and clinical variables, the differences in the group means of vWf, sP-sel, and fibrinogen remained significantly different between the low and high TDI indexes. D-dimer levels were unrelated to any TDI indexes. None of the transmitral flow indexes were independently related to the research indexes.


CONCLUSIONS
In patients with CAD, diastolic dysfunction was closely associated with increased platelet activation and endothelial damage/dysfunction independent of systolic function. TDI-derived indexes are more sensitively related to plasma hemostatic markers than transmitral indexes in middle-aged patients with CAD.
Lee
Kaeng W
KW
University Department of Medicine, City Hospital, Birmingham, UK.
Blann
Andrew D
AD
Lip
Gregory Y H
GY
D001783:Blood Flow Velocity; D003324:Coronary Artery Disease / Q000097:blood* / Q000000981:diagnostic imaging / Q000503:physiopathology*; D015150:Echocardiography, Doppler; D004730:Endothelium, Vascular; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008943:Mitral Valve / Q000503:physiopathology; D015539:Platelet Activation; D011237:Predictive Value of Tests; D013318:Stroke Volume