Which energy source is characterized by high-frequency electrical currents?

The correct choice, which is characterized by high-frequency electrical currents, is radiofrequency energy. Radiofrequency ablation utilizes electrical currents in the range of several megahertz, which generate heat through resistive heating in the tissue. This method is widely used in medical procedures to eliminate tissues such as tumors or to modify heart tissue in arrhythmia treatments.

The specific frequency range allows radiofrequency energy to penetrate the tissue and effectively create a thermal effect, which is crucial for its ablation purposes. It not only provides precise control over the area of treatment but also minimizes damage to surrounding healthy tissues.

In contrast, cryoablation involves freezing tissues, laser ablation uses focused light energy to vaporize or cut tissue, and microwave energy employs microwave radiation to generate heat, but none of these methods rely on high-frequency electrical currents in the same way as radiofrequency ablation does. Each of those alternatives has its own mechanisms and applications, which do not involve the same high-frequency electrical properties.