Fastest route of absorption of local anaesthetic is
**Core Concept**
The question is testing the knowledge of the pharmacokinetics of local anesthetics, specifically their absorption and distribution in the body. Local anesthetics can be absorbed through various routes, including the bloodstream, lymphatic system, and the site of administration itself.
**Why the Correct Answer is Right**
The correct answer is intravenously administered local anesthetic. When administered intravenously, local anesthetics bypass the first-pass metabolism and are distributed rapidly throughout the body. This results in a faster onset of action compared to other routes of administration. The intravenous route is often used in emergency situations or when rapid anesthesia is required. The intravenous route also allows for more precise control over the dose and effects of the local anesthetic.
**Why Each Wrong Option is Incorrect**
**Option A:** Intramuscularly administered local anesthetic is slower to absorb than intravenous administration due to the slower release of the drug from the muscle tissue.
**Option B:** Topically administered local anesthetic, while fast-acting, is limited by its localized effect and is not absorbed systemically to the same extent as intravenous administration.
**Option C:** Epidurally administered local anesthetic is slower to absorb than intravenous administration due to the slower release of the drug from the epidural space and the need for it to diffuse through the cerebrospinal fluid.
**Clinical Pearl / High-Yield Fact**
When administering local anesthetics, it's essential to consider the route of administration, the dose, and the patient's underlying medical conditions to minimize the risk of adverse effects.
**Correct Answer:** A. Intravenous administration of local anesthetic is the fastest route of absorption, allowing for rapid onset of action.