What type of lead would typically have a screw mechanism?

The type of lead that typically has a screw mechanism is the active fixation lead. This design allows for more secure and stable placement within the heart tissue. The screw mechanism enables the lead to anchor itself within the myocardium by penetrating the tissue, which can enhance electrical stability and reduce the risk of lead displacement. This is particularly beneficial in patients who may experience movement or activity that could otherwise affect the position of the lead, ensuring consistent pacing function.

Active fixation leads are generally used in situations where long-term stability is crucial, and they can offer improved performance in certain anatomical configurations or in patients with challenging vascular access. Their ability to secure itself to the heart muscle makes them a preferred choice in many pacing scenarios.