A relative reduction in LV global longitudinal strain >15% after pacemaker implantation was associated with increased HF hospitalization, CRT upgrade, or death (47% vs 16%; p=0.001).
Cohort (n=110)
Does a reduction in LV global longitudinal strain predict adverse clinical outcomes in patients undergoing dual chamber pacemaker implantation?
A relative reduction in LV global longitudinal strain >15% following dual chamber pacemaker implantation is associated with increased RV pacing burden and predicts a higher risk of HF hospitalization, CRT upgrade, or death.
Absolute Event Rate: 47% vs 16%
p-value: p=0.001
INTRODUCTION: Frequent right ventricular (RV) pacing is associated with cardiomyopathy. The impact of RV pacing on left ventricular (LV) global longitudinal strain (GLS) and clinical outcomes is unclear. METHODS: We analyzed GLS via two-dimensional speckle tracking and LV ejection fraction (EF) on pre- and post-implantation transthoracic echocardiograms of patients undergoing dual chamber pacemaker implantation. We collected long-term data on strain, LVEF, and clinical outcomes. RESULTS: One hundred and ten patients (mean age 76 ± 12 years; 59 54% female) were followed for mean 23 ± 17 months. Mean baseline LVEF was 58 ± 11% and mean GLS was -17 ± 4%. Twenty-four (22%) patients had an absolute decrease in LVEF > 10% and 43 (39%) patients had a relative reduction of GLS > 15%. Among patients with a reduction of GLS, a larger proportion of patients had RV pacing burden ≥20% (67% vs. 46%; p = .048). Compared to patients without GLS reduction, more patients with a reduction in GLS reached a composite endpoint of HF hospitalization, CRT upgrade or death (47% vs. 16%; p = .001). CONCLUSION: Reduction in LV GLS was seen in nearly four in 10 patients undergoing pacemaker implantation and was significantly associated with increased RV pacing burden. LV GLS reduction was associated with increased risk of adverse outcomes. LV GLS may have utility in predicting outcomes among patients with RV pacing.
Manocha et al. (Sat,) conducted a cohort in Patients undergoing dual chamber pacemaker implantation (n=110). Relative reduction of LV global longitudinal strain > 15% vs. No relative reduction of LV global longitudinal strain was evaluated on Composite endpoint of HF hospitalization, CRT upgrade or death (p=0.001). A relative reduction in LV global longitudinal strain >15% after pacemaker implantation was associated with increased HF hospitalization, CRT upgrade, or death (47% vs 16%; p=0.001).