**Question:** Uses of alpha 2 agonists are all EXCEPT:

A. Increasing intraocular pressure
B. Decreasing heart rate
C. Inducing bronchospasm
D. Increasing blood glucose levels

**Core Concept:**
Alpha 2 adrenergic receptors are a subtype of alpha receptors found on sympathetic and parasympathetic neurons, smooth muscle cells, glial cells, and some immune cells. Alpha 2 agonists bind to these receptors, leading to various physiological effects. Alpha 2 agonists can be useful in managing certain conditions by acting on different organ systems.

**Why the Correct Answer is Right:**
Alpha 2 agonists are primarily used for their sympatholytic effect, which reduces sympathetic activity and allows them to be beneficial in various clinical scenarios. However, option D (increasing blood glucose levels) contradicts this principle. Alpha 2 agonists generally lower blood glucose levels by reducing glucagon secretion and stimulating insulin release, which helps in managing conditions like diabetes mellitus.

**Why Each Wrong Option is Incorrect:**

A. Increasing intraocular pressure (IOP): Alpha 2 agonists, on the contrary, lower IOP by decreasing aqueous humor production and increasing uveoscleral outflow.
B. Decreasing heart rate: Alpha 2 agonists, particularly central alpha 2 agonists, can cause bradycardia by inhibiting the sympathetic nervous system and decreasing heart rate.
C. Inducing bronchospasm: As mentioned earlier, alpha 2 agonists generally cause bronchodilation due to their sympatholytic effect.

**Clinical Pearl:**
The correct use of alpha 2 agonists is essential to take advantage of their beneficial effects. When selecting a specific alpha 2 agonist for a clinical scenario, consider the patient's specific condition, target organ, and potential side effects to find the best choice. For example, clonidine is used in hypertension and as an analgesic due to its central action on alpha 2 receptors in the locus coeruleus and the hypothalamus, while dexmedetomidine is used in anesthesia and critical care for its sympatholytic effect and sedative properties.

**Correct Answer:**
Correct answer: D. Increasing blood glucose levels

**Why the Correct Answer is Right:**
Dexmedetomidine is a highly selective alpha 2 agonist that has a potent sympatholytic effect and sedative properties. It is commonly used in anesthesia and critical care settings to maintain blood glucose levels by stimulating insulin release and inhibiting glucagon secretion, which helps prevent hypoglycemia in critically ill patients.