Using sequential BV pacing, generally with LV preactivation, moderate improvements in LV systolic function can be achieved in selected patients. Baseline PR interval may aid in the selection of the optimum cardiac resynchronization therapy (CRT) mode, favoring LV pacing in patients with a PR interval < or =200 ms.

We conclude that SSCL is more specific instrument for a measurement of PVI success or failure.

About 10 % of ICD patients had an indication for BIV at time of implant. Over a mean FU period of 34 months, 16% of all patients presented an indication for BIV. Patients with an indication for BIV had a higher mortality rate and more frequent atrial fibrillation compared to patients without. With this data and the good clinical results after BIV-ICD implantation, we consider the implantation of a BIV-ICD system in every patient with appropriate indications.

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