**Radio-frequency ablation**

**Core Concept**
Radio-frequency ablation (RFA) is a minimally invasive procedure used to destroy or ablate abnormal electrical pathways in the body, particularly in the treatment of arrhythmias, tumor ablation, and pain management. It involves the use of electrical energy to heat and destroy targeted tissues.

**Why the Correct Answer is Right**
Radio-frequency ablation works by using a special catheter inserted through a blood vessel and guided to the target site. The catheter emits radio-frequency energy, which generates heat that causes tissue necrosis and ablation of abnormal electrical pathways. This procedure is commonly used for treating atrial fibrillation, ventricular tachycardia, and certain types of tumors.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because RFA is not typically used for treating cardiac valve disorders. While it can be used to ablate abnormal electrical pathways in the heart, it is not a primary treatment for valve problems.
**Option B:** This option is incorrect because RFA is not a surgical procedure, but rather a minimally invasive technique. It does not involve making incisions or opening the chest cavity.
**Option C:** This option is incorrect because RFA is not typically used for treating hypertension. While it can be used to ablate abnormal electrical pathways in the heart that contribute to high blood pressure, it is not a primary treatment for hypertension.
**Option D:** This option is incorrect because RFA is not typically used for treating infections. While it can be used to ablate abnormal tissue, it is not an effective treatment for bacterial or viral infections.

**Clinical Pearl / High-Yield Fact**
RFA is a highly effective treatment for certain types of arrhythmias, with success rates ranging from 70-90% in some studies. It is also a valuable tool for pain management, particularly for treating chronic back pain and other types of pain that are resistant to other treatments.

**Correct Answer:** B. RFA is done for arrhythmias, tumor ablation, and pain management.