Baseline Doppler parameters are useful predictors of chronic left ventricular reduction in size by cardiac resynchronization therapy
Abstrakt
Aims The identification of responders to cardiac resynchronization therapy (CRT) in patients with left ventricular (W) dysfunction and left bundle branch block (LBBB) remains difficult. We aimed to define the predictive value of conventional Doppler parameters.
Methods and results In 73 patients (65 +/- 9 years, 51 mate, 36 ischaemic, 37 non-ischaemic cardiomyopathy, QRS 167 +/- 31 ms, LVEF 23 +/- 6%) with LBBB, a CRT device was implanted. LV pre-ejection interval (PEI), interventricular mechanical delay (IVMD), LV fitting time (FT), and myocardial performance index (MPI) were assessed at baseline and on optimized CRT.
Left ventricular end-diastolic diameter (EDD) was obtained at baseline and after 10.6 +/- 6.7 months. end-diastolic diameter diminished from 66.3 +/- 8.1 to 59.9 +/- 9.6 mm (P = 140 ms had a 82% accuracy to predict long-term LVEDD reduction (sensitivity 86%, specificity 67%, positive and negative predictive values 91 and 56%, respectively). Multivariate analysis solely revealed baseline LVPEI as predictor of LVEDD reduction.
FT and MPI correlated only with their respective improvements. Conclusion Left ventricular pre-ejection interval and IVMD predict favourable LV remodelling on CRT.
The additional application of tissue Doppler parameters may further increase specificity and negative predictive value.