Drug used in acute congestive glaucoma are all except:
**Question:** Drugs used in acute congestive glaucoma are all except:
A. Propranolol
B. Timolol
C. Phenylephrine
D. Epinephrine
**Core Concept:** Acute congestive glaucoma is a medical emergency characterized by an acute increase in intraocular pressure (IOP) leading to optic nerve damage. It is typically secondary to an acute angle closure, either primary or secondary to cataract surgery or trauma.
**Why the Correct Answer is Right:** The correct answer is D. Epinephrine because it is a sympathomimetic drug that increases IOP by constricting the iris and narrowing the angle between the cornea and iris, thus exacerbating the condition.
**Why Each Wrong Option is Incorrect:**
A. Propranolol: It is a beta-blocker, which reduces IOP by decreasing the aqueous humor production, reducing the rate of aqueous humor outflow, and increasing the rate of uveoscleral outflow. In acute congestive glaucoma, this option would worsen the condition.
B. Timolol: Similar to propranolol, it is another beta-blocker that reduces IOP by the same mechanisms as propranolol. In acute congestive glaucoma, this option would worsen the condition.
C. Phenylephrine: It is a sympathomimetic drug, like epinephrine, which increases IOP by constricting the iris and narrowing the angle between the cornea and iris. In acute congestive glaucoma, this option would exacerbate the condition.
**Clinical Pearl:** In acute congestive glaucoma, the primary treatment involves medications that widen the angle between the cornea and iris to reduce IOP. This increases the aqueous humor outflow and decreases the aqueous humor production. Therefore, beta-blockers (A, B) and phenylephrine (C) are contraindicated, while epinephrine (D) is the wrong choice.
**Correct Answer:** D. Epinephrine is contraindicated in acute congestive glaucoma because it increases IOP by constricting the iris and narrowing the angle between the cornea and iris, exacerbating the condition. In contrast, beta-blockers and phenylephrine worsen the situation, while the correct treatment involves medications that widen the angle between the cornea and iris to reduce IOP.