Sympathectomy is indicated in all following conditions except
**Core Concept**
Sympathectomy is a surgical procedure that involves the interruption or removal of the sympathetic nervous system, which is responsible for the body's "fight or flight" response. This procedure can be used to treat various conditions, including hypertension, hyperhidrosis, and certain types of pain.
**Why the Correct Answer is Right**
Sympathectomy is indicated in conditions where the sympathetic nervous system is overactive or contributing to the disease process. For example, in the case of essential hypertension, sympathectomy can be used to reduce blood pressure by decreasing the sympathetic tone on the blood vessels. Similarly, in the case of hyperhidrosis, sympathectomy can be used to reduce excessive sweating by interrupting the sympathetic nerves that control sweat glands.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because sympathectomy is not indicated in conditions where the parasympathetic nervous system is underactive. The parasympathetic nervous system is responsible for promoting "rest and digest" functions, and conditions such as orthostatic hypotension are better treated with medications that increase parasympathetic tone, not sympathectomy.
* **Option B:** This option is incorrect because sympathectomy is not indicated in conditions where the sympathetic nervous system is not contributing to the disease process. For example, in the case of chronic pain, sympathectomy may not be effective if the pain is not caused by sympathetic nervous system overactivity.
* **Option C:** This option is incorrect because sympathectomy is not indicated in conditions where the procedure may worsen the condition. For example, in the case of certain types of heart failure, sympathectomy may worsen the condition by reducing the heart's ability to pump blood.
**Clinical Pearl / High-Yield Fact**
* Sympathectomy is a permanent procedure and should be used only after other treatments have failed. It's essential to carefully evaluate patients for sympathectomy to ensure that the procedure is likely to be effective and safe.
**Correct Answer: B.**