Left ventricular apical wall motion abnormality is associated with lack of response to cardiac resynchronization therapy in patients with ischemic cardiomyopathy

BackgroundMany patients with appropriate indications fail to respond to cardiac resynchronization therapy (CRT).ObjectiveThe purpose of our study was to determine the relationship between CRT response and preimplantation apical wall motion abnormality.MethodsWe analyzed data from 83 patients with ischemic cardiomyopathy who underwent CRT. All patients had New York Heart Association class III or IV symptoms despite maximal medical therapy, left ventricular ejection fraction (LVEF) ≤35%, and QRS duration ≥130 ms or <130 ms with left ventricular dyssynchrony. CRT responders at 6 months were defined as surviving patients with: (1) no hospitalization for heart failure, and (2) improvement of New York Heart Association classification. Patients underwent echocardiography before and 6 months after implantation to assess changes in regional wall motion and LVEF.ResultsAt baseline, CRT responders (n = 39) and nonresponders (n = 44) had similar LVEF (22.9% ± 6.9% vs 23.1% ± 8.3%), QRS duration (159 ± 43 ms vs 159 ± 36 ms), and medical treatment. CRT nonresponders had a higher prevalence of preimplantation apical wall motion abnormality (68% vs 33%, P = .003). Patients with baseline apical wall motion abnormalities (n = 43) were less likely than others (n = 40) to show improvement in wall motion at 6 months (30% vs 81%, P < .001) or clinical response to CRT (31% vs 64%, P = .003).ConclusionThe presence of a preimplantation apical wall motion abnormality was associated with a lower rate of CRT response in patients with ischemic cardiomyopathy.