Cardiac resynchronization therapy in patients with heart failure and narrow QRS complexes ( ≤ 130 ms): role of speckle tracking echocardiography and different interventricular (VV) pacing intervals

ConclusionsComparable myocardial SP and SR characteristics and LVEF improvement with VV60 and LV-only pacing in the acute setting and long-term outcome of CRT by “sequential LV-RV” pacing seen in patients with both narrow and wide QRS duration suggest that CRT device implantation may be justified in select patients with HFrEF and narrow QRS duration (<  130 ms) who have demonstrable dyssynchrony and abnormal myocardial SP and SR characteristics.
Source: Journal of Interventional Cardiac Electrophysiology - Category: Cardiology Source Type: research