Regional Left Ventricular Diastolic Dysfunction Evaluated by Pulsed-Tissue Doppler Echocardiography.
Pulsed-wave Doppler tissue imaging (DTI) allows the examination of regional wall motion at a very high temporal resolution and therefore constitutes an excellent technique for assessing diastolic motion of left ventricular walls. Regional relaxation has been well characterized in normal subjects using this technique, and physiological time intervals and motion wave profiles are described. In an experimental model of acute ischemia, local relaxation impairment was observed showing highly characteristic local diastolic abnormalities. Interestingly, these findings took place before any decrease in systolic motion was recordable. In a prospective clinical study, noninvasive regional DTI parameters were compared with coronary angiography to assess the feasibility and clinical value of the technique; the diagnostic accuracy is discussed in detail. Also, the association between regional diastolic parameters and global regional function as assessed by Doppler analysis of transmitral left ventricular filling flow was studied, stressing the impact of regional diastolic function on overall ventricular performance. Finally, the diagnostic role of pulsed-wave DTI on stress testing, identification of myocardial viability, and microvascular angina is reviewed.
Garcia-Fernandez
Miguel Angel
MA
Servicio de Cardiologia No Invasiva, Laboratorio de Ecocardiografia, Hospital General Universitario "Gregorio Marañon," Calle Doctor Esquerdo 46, Madrid 28007, Spain.
Azevedo
José
J
Moreno
Mar
M
Bermejo
Javier
J
Moreno
Raul
R