What is the mechanism of an active fixation lead?

An active fixation lead utilizes a helix mechanism that screws into the endocardial tissue to secure the lead in place. This design allows the lead to create a stable connection with the heart’s inner lining, ensuring reliable pacing and sensing. The helix can be rotated into the tissue, resulting in a firm grip that minimizes the risk of lead displacement due to the movement inherent in cardiac cycles or patient activity.

Unlike other fixation methods that may rely on pressure or expansion, the helix’s threaded design provides a strong mechanical bond to the tissue, significantly enhancing the lead's stability and overall performance in pacing. This is crucial for consistent cardiac stimulation and effective therapy in patients with pacing needs.