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lüll Echocardiographic optimization of the atrioventricular and interventricular intervals during cardiac resynchronization Barold SS; Ilercil A; Herweg BEuropace 2008[Nov]; 10 Suppl 3 (ä): iii88-95An optimized atrioventricular (AV) interval can maximize the benefits of cardiac resynchronization therapy (CRT). If programmed poorly, it may curtail beneficial effects of CRT. AV optimization will not convert non-responder to responder, but may convert under-responder to improved status. There are many echocardiographic techniques for AV optimization but there is no universally accepted gold standard. The optimal AV delay varies with time, necessitating periodic re-evaluation. As the optimal AV delay may lengthen on exercise, a rate-adaptive AV delay should not be routinely programmed. Intra- and interatrial conduction delays may require AV junctional ablation when AV optimization is impossible in patients with a poor clinical response. Fusion with the spontaneous QRS complex may be acceptable on a trial basis to seek a better clinical response or with a short PR interval. Routine VV optimization is presently controversial but programming may prove beneficial in some patients with a suboptimal CRT response where no cause is found. It may partially compensate for less than optimal left ventricular (LV) lead position and may correct for heterogeneous ventricular activation including a prolonged LV latency interval and slow conduction (scarring) near the LV pacing site. VV timing is generally programmed using the aortic velocity-time integral, and long-term variations of the optimal value necessitate periodic re-evaluation.|Cardiac Pacing, Artificial/*methods[MESH]|Echocardiography/*methods[MESH]|Heart Failure/*diagnostic imaging/*prevention & control[MESH]|Humans[MESH]|Image Enhancement/methods[MESH]|Outcome Assessment, Health Care/*methods[MESH]|Quality Control[MESH]|Treatment Outcome[MESH]|Ultrasonography, Interventional/*methods[MESH] |