What characteristic is associated with transvenous leads?

Transvenous leads require a fixation mechanism to ensure they remain securely in place within the cardiac structure. This is crucial because proper placement and stability of the lead can significantly impact the pacing functionality and overall effectiveness of the device in treating cardiac rhythm issues. The fixation mechanism may involve passive or active stabilization techniques, which help to anchor the lead in the desired location within the heart, typically the right ventricle or atrium.

The need for a fixation mechanism is a defining characteristic of transvenous leads as they are introduced via a vein and navigate to the heart, which can sometimes cause them to shift if not properly secured. This is what distinguishes them from other types of leads that may use alternative methods of securing or may not require such mechanisms due to their different applications or placement techniques.