Beta blocker without local anaesthetic effect is:
**Core Concept**
Beta blockers are a class of medications that inhibit the effects of epinephrine (adrenaline) and other sympathetic amines by blocking beta-adrenergic receptors in the body. They are primarily used to manage conditions such as hypertension, angina, and tachyarrhythmias. Some beta blockers also possess local anaesthetic properties due to their ability to block sodium channels.
**Why the Correct Answer is Right**
The correct answer is a beta blocker that does not possess local anaesthetic effects. This is because it lacks the ability to block sodium channels, which is responsible for its local anaesthetic properties. The correct answer is **nadolol**, which is a non-selective beta blocker that primarily targets beta-1 receptors in the heart.
**Why Each Wrong Option is Incorrect**
**Option A:** **Propranolol** - This is a non-selective beta blocker that also possesses local anaesthetic effects due to its ability to block sodium channels.
**Option B:** **Timolol** - This is a non-selective beta blocker that also has local anaesthetic properties.
**Option C:** **Metoprolol** - This is a selective beta-1 blocker that also has local anaesthetic effects.
**Clinical Pearl / High-Yield Fact**
Beta blockers with local anaesthetic effects are often used in the treatment of glaucoma, as they can decrease intraocular pressure. However, their use in this context is limited due to the risk of systemic side effects.
**Correct Answer:** . Nadolol.