Abstract
Purpose: The Medtronic Model 4194 (Attain® Bipolar OTW) US Clinical Study was a prospective, non-randomized, multicenter clinical trial that evaluated a new 6 Fr. LV bipolar lead in patients receiving a CRT system. A CRT system, including a CRT device and a Model 4194 LV lead was successfully implanted in 165 patients. Data was collected on LV bipolar (LVB) and LVtip-RVring (LVRV) pacing thresholds, bipolar R-wave amplitudes (BRW) and impedances during implant. Additional data was collected on LV lead location and LV vein size. There have been previous reports suggesting that LV pacing thresholds (in linear or non-curved or non-canted leads) may get worse as the vessel size gets larger relative to the electrode diameter (due to lack of electrode contact). We investigated the relationships between LV vein size and location and the LV pacing thresholds, R-wave amplitudes, and impedances.
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