Temporary epicardial pacing wires (TEPW) are commonly used during heart surgery to monitor and treat postoperative arrhythmias. After use, they are either manually removed or, in up to 10% of cases, left in the body due to extraction complications, which can lead to rare but serious complications. We investigate fully resorbable TEPW made from molybdenum and biopolymers as a solution. In-vitro performance of resorbable TEPW was previously detailed in the first part of the study. Now, we report on their degradation, pacing performance, and biocompatibility in a 12-month in-vivo rat study.