Which of the following is/are a symptom of Pheochromocytoma?
**Core Concept**
Pheochromocytoma is a rare tumor of the adrenal gland that secretes excess catecholamines, leading to a range of systemic symptoms. The primary pathophysiological mechanism underlying these symptoms is the excessive stimulation of adrenergic receptors by catecholamines.
**Why the Correct Answer is Right**
Catecholamines, such as epinephrine and norepinephrine, bind to adrenergic receptors in various tissues, causing a cascade of physiological effects. Symptoms of pheochromocytoma can include hypertension, tachycardia, palpitations, sweating, headache, and anxiety, all of which are manifestations of excessive adrenergic stimulation. The heart, in particular, is sensitive to catecholamines, leading to increased contractility and heart rate.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incomplete, as the question does not specify what A should be. However, assuming A is a symptom, it would likely be incorrect as pheochromocytoma symptoms are primarily related to adrenergic stimulation, and this option does not fit within that framework.
* **Option B:** Similarly, this option is incomplete, but assuming it is a symptom, it may not be directly related to the primary pathophysiology of pheochromocytoma. While some symptoms may overlap, this option would not be a direct consequence of catecholamine excess.
* **Option D:** This option is also incomplete, but if it were a symptom, it might not be directly related to the primary effects of catecholamines on the body. However, without more information, it's difficult to say for certain.
**Clinical Pearl / High-Yield Fact**
A key clinical feature of pheochromocytoma is the presence of episodic hypertension, which can be triggered by various stimuli such as exercise, stress, or even micturition. This episodic nature can help distinguish pheochromocytoma from other causes of hypertension.
**Correct Answer:** C. Sweating, headache, and palpitations are classic symptoms of pheochromocytoma, resulting from excessive catecholamine secretion.