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- W310157799 abstract "Background Nominal atrioventricular (AV) interval in dual chamber pacemaker (DDD) is not the best AV delay in the majority of patients with atrioventricular block. To find a simple method for optimizing AV delay adjustment, we assessed surface electrocardiography (ECG) for optimizing AV delay during dual chamber pacing. Methods DDD pacemakers were implanted in 46 patients with complete, or almost complete, AV block. Optimal AV delay was achieved by programming an additional delay of 100 ms, to the width of intrinsic P wave or to the interval between pacing spike to the end of P wave on surface ECG. Left ventricular (LV) end diastolic and end systolic volumes, ejection fraction and diastolic parameters were measured by Doppler echocardiography during both nominal and optimal AV delay pacing. Results Compared to nominal AV delay setting, LV end diastolic volume increased [to (53.2±11.3) ml from (50.2 ± 10.2) ml, P<0.05], end systolic volume decreased [to (26.1 ±9.0) ml from (27.9 ± 8.2) ml, P<0.05] during adjusted AV delay pacing, resulting in an increase in LV ejection fraction [to (68.2 ± 5.3)% from (64.5 ± 4.3)%, P<0.05]. LV diastolic filling and isovolumic relaxation time were not significantly changed. Conclusion Optimization of AV delay by surface ECG is a simple method to improve LV systolic function during dual chamber pacing." @default.
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- W310157799 date "2006-03-01" @default.
- W310157799 modified "2023-10-17" @default.
- W310157799 title "Optimization of atrioventricular delay by surface electrocardiography during dual chamber pacing" @default.
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- W310157799 doi "https://doi.org/10.1097/00029330-200603020-00004" @default.
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