RCIS Practice Test 2025 – All-in-One Exam Prep

The DDD pacing generator is designed to simultaneously pace both the atria and the ventricles while also being capable of sensing intrinsic cardiac activity. The key feature of DDD pacing is its ability to inhibit pacing when the heart generates its own QRS complexes, ensuring that the natural rhythm of the heart is maintained whenever possible.

In cases where atrial depolarization occurs, the DDD generator can respond by depolarizing the ventricles accordingly. This dual-chamber pacing approach effectively maintains synchronicity between the atria and ventricles, which is particularly beneficial for patients with certain types of heart block or other conduction abnormalities.

By inhibiting the pacing when intrinsic QRS complexes are detected, DDD pacing minimizes unnecessary pacing impulses, thus preserving the natural contraction and function of the heart. This capability makes it the preferred choice for many patients needing pacing in both the atria and ventricles.