Which pacing system is characterized by a fully self-contained unit?

The Micra catheter pacing system is recognized as a fully self-contained unit due to its unique design and functionality. Unlike traditional pacing systems that require separate leads and generators, the Micra is a miniature pacemaker that can be directly implanted into the heart via a catheter. This design eliminates the need for pockets, as seen with standard pacemakers, and allows for a less invasive procedure.

The fully self-contained nature of the Micra means that it includes all necessary components—such as the power source, pacing circuitry, and leads—within a small capsule. This allows it to provide effective pacing while minimizing complications associated with lead and pocket issues found in other pacing systems. The simplicity of having a single, compact unit enhances patient comfort and reduces the risk of infection and other complications that can arise from more complex systems.

In contrast, other pacemakers mentioned in the options typically consist of separate components: traditional single and dual-chamber pacemakers utilize leads that connect the pulse generator to the heart, and the triple chamber pacing device also requires additional leads for its advanced functionality. These distinctions highlight the innovative aspect of the Micra system, solidifying its position as a fully self-contained pacing solution.